1 Table 2. Radiometric ages from the Greater Antilles and the Virgin Islands, including K/Ar, 40Ar/39Ar, fission-track, Rb/Sr, U/Pb, Re/Os, and Lu/Hf age determinations. [Methods: K/Ar, potassium-argon; 40/39, 40Ar/39Ar (includes plateau, total fusion, integrated, or isochron ages); Lu/Hf, lutetium-hafnium; Rb/Sr, rubidium-strontium; Re/Os, rhenium-osmium; U/Pb, uranium-lead (LA-ICP-MS, laser ablation inductively coupled plasma mass spectrometry; SHRIMP, sensitive high-resolution ion microprobe; or TIMS, thermal ionization mass spectrometry); Other abbreviations: K, potassium; K-feldspar, potassium feldspar; MORB, midocean-ridge basalt; MSWD, mean square weighted deviation; n/a, not available or applicable as appropriate; T (as in, ‘high T fractions’), temperature] Sample no. Latitude (decimal degrees) Longitude (decimal degrees) Rock type Mineral Method Age (Ma) Analytical error (Ma) Comments Reference(s) British Virgin Islands PI-13A 18.332 -64.5719 Diorite Zircon TIMS Multigrain 30.64 0.46 The diorite phase of the Peter Island suite yields two concordant and two normally discordant fractions spanning 30.62 to 30.83 Ma, with a 206Pb/238U weighted average of 30.6 Ma. This age is corroborated by LA-ICP-MS analysis of 11 grains giving weighted mean age of 30.64±0.46 Ma (MSWD = 1.09; C. Allen, personal commun., 2010). One concordant fraction gives an older age of 32.5 Ma, interpreted to reflect inheritance of zircon cores from earlier magmas. Schrecengost, 2010 VI-7 18.3723 -64.7425 Granodiorite Hornblende K/Ar 23.7 0.3 Reported as Narrows pluton. No location provided; crudely approximate location here is a guess based on location of pluton near Fort Recovery. Date recalculated using constants of Steiger and Jager (1977). Kesler and Sutter, 1979; Vila and others, 1986; Rankin, 2002 VI 29 18.383 -64.6723 Diorite Whole rock K/Ar 42.80 2.14 Narrows pluton, Fort Recovery on Tortola. Vila and others, 1986; Rankin, 2002 VIJ 453 18.383 -64.6723 Granite Whole rock K/Ar 35.37 1.77 Granite, Virgin Gorda batholith at The Baths, Virgin Gorda. Vila and others, 1986; Rankin, 2002 VG-05 18.4264 -64.4452 Granodiorite Zircon TIMS Multigrain 37.62 0.05 Six concordant fractions of VG-05 cluster and yield an age of 37.62±0.05 Ma (MSWD = 0.53). Schrecengost, 2010 VI-8 18.434 -64.427 Granodiorite Biotite K/Ar 31.9 0.4 Reported as Copper Mine Point granodiorite, same pluton as Cox and others (1977) sample V-G-1. Location derived from Wikipedia for Copper Mine Point copper mine; accuracy of location relative to this sample is unknown. Date recalculated using constants of Steiger and Jager (1977). Kesler and Sutter, 1979; Vila and others, 1986; Rankin, 2002 V-G-1 18.4375 -64.4361 Quartz diorite Hornblende K/Ar 35.1 1.6 Quartz diorite (also reported as granodiorite) from the Virgin Islands batholith; date recalculated using constants of Steiger and Jager (1977). Copper Mine Point, Virgin Gorda batholith. Cox and others, 1977; Vila and others, 1986; Kesler and Sutter, 1979; Rankin, 2002 Biotite K/Ar 37.2 0.9 VG-06 18.4414 -64.4384 Tonalite Zircon TIMS Multigrain 37.6 Two concordant fractions of VG-06 cluster at 37.6. No error reported. Schrecengost, 2010 TTL 459 18.4418 -64.5477 Diorite Whole rock K/Ar 38.85 1.94 Virgin Gorda batholith, Beef Island. Vila and others, 1986; Rankin, 2002 BI-26 18.4430 -64.5433 Tonalite Zircon TIMS Multigrain 42.55 0.44 Four concordant fractions of BI-26, the tonalite phase of the Beef Island suite, span from 42.29 to 42.43 Ma. LA-ICP-MS of seven zircon grains from BI-26 provides a weighted age of 42.55±0.44 Ma (MSWD = 0.27; C. Allen, personal commun., 2010). Schrecengost, 2010 VG-01 18.4867 -64.3886 Quartz diorite Zircon TIMS Multigrain 43.56 0.08 Four concordant fractions of the quartz diorite phase of the North Sound suite, VG-01, span from 43.53 to 43.62 Ma. These four fractions, together, yield an age of 43.56±0.08 Ma (MSWD = 0.082). Schrecengost, 2010 VIJ 451 18.484 -64.389 Gabbro Whole rock K/Ar 60.36 3.02 Gabbro, Virgin Gorda batholith near Virgin Peak, Virgin Gorda Vila and others, 1986; Rankin, 2002 Cuba CU49 19.9339 -76.8278 Trondhjemite Zircon U/Pb SHRIMP 60.2 2.6 Turquino Massif, 3 grains. Coordinates adjusted northward to place site onshore. Rojas-Agramonte and others, 2004, 2006 Unknown 19.9380 -76.7930 Unknown Zircon U/Pb 56 Turquino Massif. No error reported. Kysar and others, 1998; Rojas-Agramonte and others, 2004 4382 19.9443 -75.6571 Quartz diorite Whole rock K/Ar 47.8 6 Daiquiri quartz diorite, 20 km east of Santiago de Cuba, southern Oriente Province. Latitude and longitude approximate. Early to middle Eocene. Sierra Maestra. Late in Laramide orogeny. Original reported age was 49 Ma, recalculated here using constants of Steiger and Jager (1977). Two determinations were made and average was reported. Individual determinations were (recalculated) 45.3 and 49.1 Ma. Same as Meyerhoff's sample 7. Laverov and others, 1967; Meyerhoff and others, 1969 CU40 19.9464 -76.7171 Tonalite Zircon Fission-track 44 4 Peladero Massif, 7 grains. Rojas-Agramonte and others, 2006 Biotite 40/39 Integrated 53.8 3.8 Peladero Massif. Integrated age, steps 4 to 14. CU60 19.9464 -76.7173 Tonalite Apatite Fission-track 31 10 Turquino Massif, 20 grains. Rojas-Agramonte and others, 2006 Zircon U/Pb SHRIMP 55.4 0.7 Turquino Massif, 8 grains. Rojas-Agramonte and others, 2004, 2006 CU5 19.9558 -75.6786 Tonalite Zircon Fission-track 36 4 Daiquiri Massif southeast of Santiago de Cuba, 9 grains. Rojas-Agramonte and others, 2006 U/Pb SHRIMP 50.1 .5 Daiquiri Massif southeast of Santiago de Cuba, 5 grains. Rojas-Agramonte and others, 2004, 2006 U/Pb SHRIMP 310.8 3.4 Daiquiri Massif southeast of Santiago de Cuba, 1 grain, either inherited or possible laboratory contamination. Rojas-Agramonte and others, 2004, 2006 2 Sample no. Latitude (decimal degrees) Longitude (decimal degrees) Rock type Mineral Method Age (Ma) Analytical error (Ma) Comments Reference(s) Cuba—Continued 4380 19.9607 -76.0104 Diorite Whole rock K/Ar 58.1 8 Nima-Nima diorite, 20 km west of Santiago de Cuba, southern Oriente Province. Latitude and longitude approximate. Paleocene. Sierra Maestra. Late in Laramide orogeny. Original reported age was 58 Ma, recalculated using constants of Steiger and Jager (1977). Two determinations were made and average was reported. Individual determinations were (recalculated) 53.5 and 60.4 Ma. Same as Meyerhoff's sample 9. Laverov and others, 1967; Meyerhoff and others, 1969 4383 19.9607 -76.0107 Plagiogranite Whole rock K/Ar 44.2 6 Nima-Nima plagiogranite porphyry, 20 km west of Santiago de Cuba, southern Oriente Province. Latitude and longitude approximate. Early to middle Eocene. Sierra Maestra. Late in Laramide orogeny. Original reported age was 46 Ma, recalculated using constants of Steiger and Jager (1977). Two determinations were made and average was reported. Individual determinations were (recalculated) 45.2 and 43.3 Ma. Same as Meyerhoff's sample 8. Laverov and others, 1967; Meyerhoff and others, 1969 Unknown 19.9610 -75.6760 Dacite Zircon U/Pb 49.7 .3 Flow structurally above Daiquiri intrusion. Kysar and others, 1998; Rojas-Agramonte and others, 2004 Unknown 19.961 -75.676 Quartz diorite Zircon U/Pb 49.8 .2 Daiquiri Massif. Kysar and others, 1998; Rojas-Agramonte and others, 2004 Unknown 19.961 -75.676 Gabbro-diorite Zircon U/Pb 50.2 .1 Daiquiri Massif. Kysar and others, 1998; Rojas-Agramonte and others, 2004 Unknown 19.9610 -75.6760 Andesite Zircon U/Pb 50.6 .1 Dike. Kysar and others, 1998; Rojas-Agramonte and others, 2004 Unknown 19.961 -75.676 Gabbro Unknown Unknown 76 3.8 Rodriguez-Crombet and others, 1997 Unknown 19.961 -75.676 Quartz diorite Unknown Unknown 39 4 Alioshin and others, 1975; Rojas- Agramonte and others, 2006 Unknown 19.961 -75.676 Tonalite Unknown Unknown 54 5 Alioshin and others, 1975; Rojas- Agramonte and others, 2006 Unknown 19.961 -75.954 Quartz diorite Unknown Unknown 42 5 Eguipko and Perez, 1976 Unknown 19.961 -75.676 Tonalite Unknown Unknown 44 4 Eguipko and Perez, 1976 Unknown 19.961 -75.954 Quartz diorite Unknown K/Ar 58 5 Laverov and Cabrera, 1967 Unknown 19.961 -75.954 Quartz diorite Unknown K/Ar 58 5 Laverov and Cabrera, 1967 CU30 19.9628 -75.7864 Tonalite Zircon U/Pb SHRIMP 50.1 .5 Nima-Nima Massif southwest of Santiago de Cuba, 6 grains. Rojas-Agramonte and others, 2004, 2006 Zircon Fission-track 32 3 Nima-Nima Massif southwest of Santiago de Cuba, 8 grains. Rojas-Agramonte and others, 2006 Apatite Fission-track 44 13 Nima-Nima Massif southwest of Santiago de Cuba, 30 grains. CU29 19.9636 -75.9889 Tonalite Zircon U/Pb SHRIMP 50.5 .5 Nima-Nima Massif southwest of Santiago de Cuba, 8 grains. Rojas-Agramonte and others, 2004, 2006 Zircon Fission-track 39 4 Nima-Nima Massif southwest of Santiago de Cuba, 8 grains. Rojas-Agramonte and others, 2006 Biotite 40/39 Integrated 49.9 2.4 Nima-Nima Massif southwest of Santiago de Cuba. Integrated age, steps 8 to 19. CU32 19.9669 -75.9489 Tonalite Zircon Fission-track 41 3 Nima-Nima Massif southwest of Santiago de Cuba. 15 grains. Rojas-Agramonte and others, 2006 D316 20.0942 -74.765 Amphibolite Unknown, whole rock? K/Ar 80 10 All locations from source are approximate generalities. Garnet amphibolite, inclusion in serpentinite mélange, North of San Antonio del Sur, Guantanamo Province. Reported age was 10 Ma which is probably the error, calculated age based on reported analytical data. Somin and others, 1992 CU147B 19.9697 -76.6836 Tonalite Zircon U/Pb SHRIMP 48.2 .4 Peladero Massif, 7 grains. Rojas-Agramonte and others, 2004, 2006 Unknown 19.997 -76.466 Quartz diorite Zircon U/Pb 46.9 .1 Guama Massif. Kysar and others, 1998; Rojas-Agramonte and others, 2004 D322-1 20.0942 -74.765 Schist Unknown, WR? K/Ar 86.8 7 All locations from source are approximate generalities. Mica-quartz-albite schist, inclusion in serpentinite mélange from north of San Antonio del Sur, Guantanamo Province. Reported age was 86 Ma, recalculated here based on reported analytical data. Duplicate sample ID in source. Somin and others, 1992 D331 20.0942 -74.765 Meta- trondhjemite Hornblende K/Ar 90.7 5 All locations from this source are approximate generalities. Meta-trondhjemite, inclusion in serpentinite mélange from north of San Antonio del Sur, Guantanamo Province. Reported age was 91 Ma on hornblende and 158 Ma on plagioclase, both recalculated here based on reported analytical data. Somin and others, 1992 Plagioclase K/Ar 157 15 D331-1M 20.0942 -74.765 Meta- trondhjemite Paragonite K/Ar 84.0 4 All locations from this source are approximate generalities. Metatrondhjemite, inclusion in serpentinite mélange from north of San Antonio del Sur, Guantanamo Province. Reported age was 87 Ma, recalculated here based on reported analytical data. Somin and others, 1992 3 Sample no. Latitude (decimal degrees) Longitude (decimal degrees) Rock type Mineral Method Age (Ma) Analytical error (Ma) Comments Reference(s) Cuba—Continued D331-3M 20.0942 -74.765 Meta- trondhjemite Paragonite K/Ar 86.8 4 All locations from source are approximate generalities. Metatrondhjemite, inclusion in serpentinite mélange from north of San Antonio del Sur, Guantanamo Province. Reported age was 87 Ma, recalculated here based on reported analytical data. Somin and others, 1992 D331-5M 20.0942 -74.765 Amphibolite Hornblende K/Ar 116.1 9 All locations from source are approximate generalities. Amphibolite, inclusion in serpentinite mélange from north of San Antonio del Sur, Guantanamo Province. Reported age was 116 Ma, recalculated here based on reported analytical data. Somin and others, 1992 D336-6 20.0942 -74.765 Pegmatite Muscovite K/Ar 122 5 All locations from source are approximate generalities. Pegmatite inclusion in serpentinite mélange from Alto de Corea, Sierra del Cristal. Reported age was 122 Ma, recalculated here based on reported analytical data. Somin and others, 1992 CU22 20.1028 -74.6825 Trondhjemite Zircon U/Pb SHRIMP 112.8 1.1 Trondhjemite boulder from mélange. Location approximate, 9 grains analyzed. Lazaro and others, 2009 CV139a 20.1108 -74.5762 Amphibolite Amphibole 40/39 Plateau 82.67 0.84 Green amphibole. Location approximate. Plateau age based on 69.9% of gas. Plateau interpreted to reflect retrograde growth or cooling of retrograde amphibole. Lazaro and others, 2009 Amphibole 40/39 Integrated 96.5 0.8 Brown amphibole. Location approximate. Integrated age based on 93.9% of gas; no plateau determined. Interpreted as cooling of peak paragasitic amphibole. D322-1 20.1108 -74.5875 Schist Unknown, whole rock? K/Ar 61.7 5 All locations from source are approximate generalities. Mica-quartz schist, Purial series from Sierra del Purial north of Inias. Reported age was 75 Ma, recalculated here based on reported analytical data. Duplicated sample number in report, this is easternmost. Somin and others, 1992 CV227b 20.1125 -74.7193 Trondhjemite Amphibole 40/39 Integrated 94.7 1.1 Location approximate. Integrated age comprises 97.7% of gas. Final step, 41.6% of gas yielded 97.7±0.9 Ma, thought to reflect paragasitic amphibole age. Retrograde age was considered indeterminate. Lazaro and others, 2009 M-3 20.1128 -74.7370 Pegmatite Unknown, whole rock? K/Ar 116.8 10 All locations from source are approximate generalities. Mica-quartz schist, Cangre belt. 15 km east of Guane. Reported age was 116 Ma, recalculated here based on reported analytical data. Doubt it was actually muscovite, contained less than 1% K2O. Somin and others, 1992 CV228c 20.1133 -74.7195 Trondhjemite Amphibole 40/39 Integrated 85.7 1.5 Location approximate. Integrated age based on 67.9% of gas, final step yielded 105.5±1.9 Ma, 29% of gas. Interpretation suggests older age reflects paragasitic amphibole and integrated age reflects retrograde amphibole. Lazaro and others, 2009 GJ-258a 20.1138 -74.3084 Garnet Amphibolite Hornblende 40/39 Plateau 78.24 1.88 4 of 5 steps, (2 to 5), normal isochron 78.31±1.84 Ma, inverse isochron 78.4±1.62 Ma, MSWD = 0.15, 40Ar/36Ar intercept 256.4±71.0. Lazaro and others, 2015 GJ-259a 20.1151 -74.3103 Garnet Amphibolite Hornblende 40/39 Plateau 76.55 2.03 4 steps (3 to 6), MSWD = 0.76, 94.8% of 39Ar released, normal isochron age 78.57±2.03, inverse isochron age 77.62±1.78, 40Ar/36Ar intercept at 188.1±69.3. Lazaro and others, 2015 OFT-146g 20.1258 -74.3125 Amphibolite Amphibole 40/39 Plateau 123.2 2.2 Very crude estimate of location. Terrible map in publication. Apparent isochron age is 119±3.1 Ma, MSWD = 1.5, initial 40Ar/36Ar = 276.4±2.9. Lazaro and others, 2016 CV230b 20.1363 -74.7195 Amphibolite Amphibole 40/39 Integrated 90.6 1.1 Interpretation reflects mixing of primary and retrograde amphibole. Combined integrated age is 90.6±1.1 Ma using 97.5% of gas. Further interpretation suggests 86.9±0.9 Ma for retrograde amphibole (71.4% gas) and 100.6±1.8 for paragasitic amphibole. Lazaro and others, 2009 GJ-9 20.1388 -74.3114 Amphibolite Amphibole 40/39 Integrated 80.70 7.58 3 of 4 steps (2 to 4), integrated age, no plateau, 99.3% 39Ar. Lazaro and others, 2015 Unknown 20.2043 -74.4147 Amphibolite Whole rock K/Ar 60.6 5 Sierra del Purial; amphibolite complex. Location not reported, coordinates here inferred. Age recalculated using constants of Steiger and Jager (1977) assuming old Russian constants were in use. Somin and Millán, 1977 (in Spanish) Unknown 20.2043 -74.4147 Amphibolite Whole rock K/Ar 63.5 0 Sierra del Purial; amphibolite complex. Location not reported, coordinates here inferred. Age recalculated using constants of Steiger and Jager (1977) assuming old Russian constants were in use. Somin and Millán, 1977 (in Spanish) CV53f 20.2885 -74.7103 Trondhjemite Amphibole 40/39 Integrated 94.8 2.3 Location approximate. Integrated age based on 97.4% of gas, reflecting mean age of magmatic and retrograde amphibole. Later steps 9 and 10 yielded 103.6±2.6 Ma, 42.2% of gas. Earlier step, 7, yielded 87.1±0.9 Ma (42.8% gas). Interpretation suggests older age reflects paragasitic amphibole and younger age reflects retrograde amphibole. Lazaro and others, 2009 D337 20.4264 -75.8608 Schist Unknown, whole rock? K/Ar 100.1 12 All locations from source are approximate generalities. Mica-quartz schist inclusion in serpentinite mélange from Alto de Corea, Sierra del Cristal. Reported age was 101 Ma, recalculated here based on reported analytical data. Somin and others, 1992 D339 20.4264 -75.8608 Pegmatite Muscovite K/Ar 93.3 4 All locations from source are approximate generalities. Pegmatite inclusion in serpentinite mélange from Alto de Corea, Sierra del Cristal. Reported age was 96 Ma, recalculated here based on reported analytical data. Somin and others, 1992 4 Sample no. Latitude (decimal degrees) Longitude (decimal degrees) Rock type Mineral Method Age (Ma) Analytical error (Ma) Comments Reference(s) Cuba—Continued D350 20.4264 -75.8608 Schist Unknown, whole rock? K/Ar 65.0 7 All locations from source are approximate generalities. Mica-quartz schist inclusion in serpentinite mélange from Alto de Corea, Sierra del Cristal. Reported age was 66 Ma, recalculated here based on reported analytical data. Somin and others, 1992 Meyerhoff_3 20.5097 -75.5373 Pegmatite Whole rock K/Ar 116 11.6 20 km south of Nicaro, northern Oriente Province. Latitude and longitude approximate. Hauterivian (Early Cretaceous). Pegmatite dike cuts metamorphic rocks of Jurassic(?) age according to Adamovich and Chejovich (1964). Age recalculated with constants of Steiger and Jager (1977). Meyerhoff and others, 1969 GM206 20.5357 -79.7358 Amphibolite Whole rock K/Ar 59.4 12 Albite garnet amphibolite. Complejos de inclusiones en serpentinita y en zonas de mélange; Zona de mélange de Rancho Veloz. anfibolita ganaffera [Complex of inclusions in serpentinite and mélange zones of Rancho Veloz, northern Villa Clara Province]. All locations from sources are approximate generalities. Reported age 60 Ma, recalculated from analytical data. Somin and Millán, 1977 (in Spanish); Somin and others, 1992 GM203-3 20.5357 -79.7357 Amphibolite Whole rock K/Ar 59.7 12 Albite garnet amphibolite. Complejos de inclusiones en serpentinita y en zonas de mélange; Zona de mélange de Rancho Veloz. anfibolita ganaffera [Complexes of inclusions in serpentinite and mélange zones of Rancho Veloz, northern Villa Clara Province] Location not reported, coordinates here inferred. Reported age 60 Ma, recalculated from analytical data. Somin and Millán, 1977 (in Spanish) LB 204 20.607 -75.734 Gabbro Amphibole K/Ar 88.6 3.5 Gabbroic dike cutting peridotite. Marchesi, 2006 C-00-18 20.883 -76.733 Granodiorite Biotite 40/39 Plateau 72.9 0.2 Macizo Majibacoa, coarse grained. Hall and others, 2004 Biotite 40/39 Plateau 73.1 0.1 Hornblende 40/39 Plateau 73.1 0.6 Hornblende 40/39 Plateau 79.9 0.5 C-00-09 21.071 -77.423 Granodiorite Hornblende 40/39 Plateau 74.2 1.4 La Union, strongly porphyritic with phenocrysts of hornblende, plagioclase and altered pyroxene? Hall and others, 2004 Hornblende 40/39 Plateau 75.6 2.1 C-00-17 21.131 -77.318 Granodiorite Hornblende 40/39 Plateau 72.9 1.3 Pueblo Nuevo, coarse grained to seriate. Hall and others, 2004 Hornblende 40/39 Plateau 73.8 0.6 C-00-03A 21.15 -77.397 Syenite K-feldspar 40/39 Total fusion 79.6 0.2 Palo Seco quarry, coarse grained. Hall and others, 2004 K-feldspar 40/39 Total fusion 79.8 0.3 Hornblende 40/39 Total fusion 96.1 0.9 Palo Seco quarry, coarse grained. P. Renne, written commun. cited in Hall and others (2004). Biotite 40/39 Total fusion 96.8 0.4 C-98-2 21.15 -77.397 Granodiorite Hornblende 40/39 Plateau 68.4 0.3 Palo Seco quarry, coarse grained. Hall and others, 2004 Hornblende 40/39 Plateau 68.9 0.9 Hornblende 40/39 Plateau 69.5 0.5 C-98-3 21.166 -77.379 Syenite Biotite 40/39 Total fusion 71.4 0.1 Small pits 0.5 km south of Deseada, coarse grained. Hall and others, 2004 Biotite 40/39 Total fusion 72.4 0.2 Biotite 40/39 Plateau 72.7 0.3 K-feldspar 40/39 Plateau 71.9 0.6 K-feldspar 40/39 Plateau 72.3 0.3 C-00-06 21.177 -77.437 Syenite Biotite 40/39 Total fusion 60.1 0.3 Las Piedras, coarse grained. Hall and others, 2004 Biotite 40/39 Plateau 65.8 0.6 C-00-11 21.187 -77.539 Basalt Whole rock 40/39 Integrated 73.7 0.5 Camujiro Formation, La Elisa. Total fusion age was 73.2±0.5 Ma, no plateau so integrated age calculated. Hall and others, 2004 Whole rock 40/39 Integrated 75.7 0.9 Camujiro Formation, La Elisa. Total fusion age was 75.0±0.9 Ma, no plateau so integrated age calculated. D-1a 21.1931 -77.3625 Porphyry Alunite 40/39 Plateau 82.0 0.3 Deseada prospect, alunite-quartz-rutile-diaspore-kaolinite replacing volcanic(?) rock. Approximate location. Kesler and others, 2004 D-1b Alunite 40/39 Total fusion 92.6 2.1 D-1c Alunite 40/39 Total fusion 84.7 0.2 D-1d Alunite 40/39 Total fusion 81.8 0.3 DES-2 21.1931 -77.3625 Porphyry K-feldspar 40/39 Plateau 75.2 0.9 Deseada prospect, feldspar porphyry. Approximate location. Kesler and others, 2004 5 Sample no. Latitude (decimal degrees) Longitude (decimal degrees) Rock type Mineral Method Age (Ma) Analytical error (Ma) Comments Reference(s) Cuba—Continued C-00-10 21.204 -77.443 Granodiorite Hornblende 40/39 Plateau 72.8 0.9 La Caridad, moderately porphyritic with phenocrysts of hornblende, plagioclase and altered pyroxene? Hall and others, 2004 Hornblende 40/39 Plateau 74.2 0.8 C-00-41 21.209 -77.782 Basalt Whole rock 40/39 Integrated 71.3 0.2 Piragua Formation, Santa Clara. Total fusion age was 64.8±0.2 Ma, no plateau so integrated age calculated. Hall and others, 2004 Whole rock 40/39 Integrated 71.5 0.2 C-00-42 21.209 -77.782 Volcaniclastic rock Whole rock 40/39 Integrated 72.1 0.2 Piragua Formation, Santa Clara. Total fusion age was 71.0±0.2 Ma, no plateau so integrated age calculated. Hall and others, 2004 73.7 0.3 Piragua Formation, Santa Clara. Total fusion age was 72.8±0.3 Ma, no plateau so integrated age calculated. C-00-05B 21.22 -77.402 Granodiorite Hornblende 40/39 Total fusion 63.2 2.5 Las Marias, Maraguan facies, very coarse grained. Hall and others, 2004 Hornblende 40/39 Plateau 73.3 0.4 Hornblende 40/39 Plateau 73.6 0.2 Biotite 40/39 Total fusion 72.3 0.2 Biotite 40/39 Plateau 73.0 0.2 C-00-40 21.223 -77.779 Basalt Whole rock 40/39 Integrated 73.0 0.2 Piragua Formation, La Eugenia. Total fusion age was 72.8±0.2 Ma, no plateau so integrated age calculated. Hall and others, 2004 Whole rock 40/39 Integrated 74.1 0.2 Piragua Formation, La Eugenia. Total fusion age was 75.6±0.2 Ma, no plateau so integrated age calculated. C-00-13A 21.2372 -76.9958 Volcanic rock Illite 40/39 Total fusion 75.5 0.2 Approximate location. Dumanuecos deposit in Caobilla Formation. Retention age 81.2±0.2 Ma. Kesler and others, 2004 C-00-22 21.247 -77.876 Basalt Whole rock 40/39 Integrated 72.3 0.2 Camujiro Formation, La Union. Total fusion age was 67.7±0.2 Ma, no plateau so integrated age calculated. Hall and others, 2004 Whole rock 40/39 Plateau 73.0 0.2 Camujiro Formation, La Union. Total fusion age was 67.7±0.1 Ma, no plateau so integrated age calculated. C-00-23A 21.247 -78.07 Rhyolite Biotite 40/39 Plateau 74.8 0.5 La Sierra Formation, Siete Palmas. Hall and others, 2004 Biotite 40/39 Plateau 75.1 0.5 C-98-1 21.26 -77.475 Rhyolite Biotite 40/39 Plateau 71.5 0.8 La Sierra Formation, Las Margaritas. Hall and others, 2004 Biotite 40/39 Plateau 72.1 0.2 K-feldspar 40/39 Plateau 72.5 0.4 K-feldspar 40/39 Plateau 73.3 0.6 C-98-1x 21.26 -77.475 Rhyolite Biotite 40/39 Plateau 71.2 0.2 La Sierra Formation, Las Margaritas. Hall and others, 2004 Biotite 40/39 Plateau 71.6 0.2 Biotite 40/39 Plateau 72.0 0.5 C-98-4 21.26 -77.475 Rhyolite K-feldspar 40/39 Plateau 72.4 0.7 La Sierra Formation, Las Margaritas. Hall and others, 2004 K-feldspar 40/39 Plateau 73.4 0.6 K-feldspar 40/39 Plateau 75.6 0.8 CSE-22-36 21.2614 -77.4958 Quartz vein Adularia 40/39 Plateau 73.3 1.5 Jacinto deposit. Reported plateau for adularia was described as a plateau-like segment of high T fractions consisting of 42% of 39Ar released. The two sources, using essentially the same figure, show different locations for this site; neither provide useful coordinates and the geologic map and Google Earth were used to provide approximate coordinates based on Kesler and others (2004) paper. Hall and others, 2004; Kesler and others, 2004 Adularia 40/39 Total fusion 74.3 0.2 CSE-22-41 21.2614 -77.4958 Quartz vein Adularia 40/39 Plateau 69.8 0.4 Jacinto deposit. The two sources, using essentially the same figure, show different locations for this site; neither provide useful coordinates and the geologic map and Google Earth were used to provide approximate coordinates based on Kesler and others (2004) paper. Hall and others, 2004; Kesler and others, 2004 C-00-21-1 21.2628 -77.7986 Porphyry K-feldspar 40/39 Total fusion 86.8 0.3 Feldspar porphyry. Tres Antenas (Vidot) prospect; paper on maps transposes name with La Mina; approximate location estimated based on map; assumes map sample numbers are transposed. Single grain age. Kesler and others, 2004 C-00-21-2 21.2628 -77.7986 Porphyry K-feldspar 40/39 Total fusion 77.3 0.3 Feldspar porphyry. Tres Antenas (Vidot) prospect; paper on maps transposes name with La Mina; approximate location estimated based on map; assumes map sample numbers are transposed. Single grain age. Kesler and others, 2004 6 Sample no. Latitude (decimal degrees) Longitude (decimal degrees) Rock type Mineral Method Age (Ma) Analytical error (Ma) Comments Reference(s) Cuba—Continued C-00-21B 21.2628 -77.7986 Porphyry Illite 40/39 Total fusion 82.0 0.2 Feldspar porphyry. Tres Antenas (Vidot) prospect; paper on maps transposes name with La Mina; approximate location estimated based on map; assumes map sample numbers are transposed. A so- called retention age was 82.6±0.2 Ma. Kesler and others, 2004 C-00-20 21.285 -77.779 Syenite Hornblende 40/39 Plateau 71.6 0.4 Jimbambay, coarse grained. Hall and others, 2004 Hornblende 40/39 Plateau 73.0 0.3 C-00-43a 21.2889 -77.7267 Greisen Muscovite 40/39 Plateau 74.7 0.2 La Mina prospect; paper on maps transposes name with Tres Antenas; approximate location estimated based on map; assumes map sample numbers are transposed. Coarse-grained muscovite and quartz. Kesler and others, 2004 C-00-43b Muscovite 40/39 Plateau 73.4 0.1 C-00-15 21.403 -77.208 Basalt Whole rock 40/39 Integrated 50.8 0.5 La Mulata Formation. Total fusion age was 50.0±0.5 Ma, integrated age calculated. Hall and others, 2004 Whole rock 40/39 Integrated 52.0 0.3 La Mulata Formation. Total fusion age was 50.6±0.3 Ma, integrated age calculated. Whole rock 40/39 Integrated 53.2 0.3 La Mulata Formation. Total fusion age was 52.2±0.3 Ma, integrated age calculated. B15-1 21.5697 -77.8900 Altered rock Whole rock K/Ar 63.7 7 All locations from this source are approximate generalities. Quartz of albite-micaceous rock, inclusions in serpentinite mélange. Sierra de los Organos. Reported age 66 Ma. Recalculated here based on reported analytical data. Somin and Millán, 1977; Somin and others, 1992 C-00-24A 21.6145 -78.1733 Volcanic rock Illite 40/39 Total fusion 77.9 0.5 Approximate location. Loma Urabo deposit in Caobilla Formation. Retention age 78.9±0.5 Ma. Kesler and others, 2004 C-00-24B 21.6145 -78.1733 Volcanic rock Muscovite 40/39 Plateau 78.6 0.2 Approximate location. Loma Urabo deposit in Caobilla Formation. Kesler and others, 2004 4386 21.6984 -82.6641 Schist Muscovite K/Ar 75.9 4 Muscovite schist, Isle of Pines, Habana Province. Latitude and longitude approximate. Senonian. Early event of Laramide orogeny? Original reported age was 78 Ma. Recalculated with modern constants. Two determinations were made and average was reported. Individual determinations were (recalculated) 74.3 and 77.5 Ma. Same as Meyerhoff's sample 5. Laverov and others, 1967; Meyerhoff and others, 1969 4387 21.6984 -82.6641 Schist Muscovite K/Ar 71.2 4 Muscovite schist, Isle of Pines, Habana Province. Latitude and longitude approximate. Senonian. Early event of Laramide orogeny? Original reported age was 73 Ma. Recalculated with modern constants. Two determinations were made and average was reported. Individual determinations were (recalculated) 69.9 and 73.2 Ma. Same as Meyerhoff's sample 6. Laverov and others, 1967; Meyerhoff and others, 1969 Meyerhoff_4 21.6984 -82.6641 Schist Muscovite K/Ar 74 2 Muscovite schist, Isle of Pines, Habana Province. Senonian (Late Cretaceous). Kuman and Gavilan (1965) erroneously reported 190-m.y. date (Khudoley, 1967a, p. 673, footnote 4; Khudoley, 1967b, p. 789, footnote 7). Dates from Isle of Pines probably reflect Laramide events. Latitude and longitude approximate. Age recalculated using constants of Steiger and Jager (1977). Kuman and Gavilan, 1965; Khudoley, 1967a,b; Meyerhoff and others, 1969 C-00-31A 21.7520 -78.5045 Volcanic rock Illite 40/39 79.8 0.4 Approximate location. El Pilar deposit in Caobilla Formation. Retention age 79.8±0.4 Ma. First step of analysis was lost, only retention age reported. Kesler and others, 2004 C-00-30B 21.8261 -78.5761 Volcanic rock Illite 40/39 Total fusion 76.7 0.2 Approximate location. San Nicolas deposit in Caobilla Formation. Retention age 80.5±0.2 Ma. Kesler and others, 2004 GME-322 21.8353 -79.6647 Eclogite Muscovite K/Ar 71.7 5 All locations from this source are approximate generalities. Apo-eclogite rock, Loma la Gloria Formation from south of Sancti Spiritus Mountains. Reported age was 71 Ma, recalculated here based on reported analytical data. Somin and others, 1992 F25-10 21.8547 -79.6397 Metabasite Paragonite K/Ar 68 2 All locations from this source are approximate generalities. Metabasite from complex of Escambray, Caracusey lithofacies; northeast of Sancti Spiritus Mountains. Age as reported, no analytical data reported. Somin and others, 1992 F50-7 21.8547 -79.6397 Eclogite Paragonite K/Ar 73 4 All locations from this source are approximate generalities. Eclogite from complex of Escambray, Caracusey lithofacies; northeast of Sancti Spiritus Mountains. Age as reported, no analytical data reported. Somin and others, 1992 Unknown 21.8594 -82.7542 Schist Muscovite K/Ar 53.7 3 Muscovite schist, Complejo carbonato - terrigeno, Isla de Pinos, Loma el Soldado [Carbonate complex - terrigenous, Isle of Pines, Loma el Soldado] Location not reported, coordinates here inferred. Age recalculated using constants of Steiger and Jager (1977) assuming old Russian constants were in use. Somin and Millán, 1977 (in Spanish) Unknown 21.8594 -82.7542 Greisen Muscovite K/Ar 64.5 4 Greisen vein, Complejo carbonato - terrigeno, Isla de Pinos, Presa del Medio-las Nuevas [Carbonate complex - terrigenous, Isle of Pines, New middle dam] Location not reported, coordinates here inferred. Age recalculated using constants of Steiger and Jager (1977) assuming old Russian constants were in use. Somin and Millán, 1977 (in Spanish) 7 Sample no. Latitude (decimal degrees) Longitude (decimal degrees) Rock type Mineral Method Age (Ma) Analytical error (Ma) Comments Reference(s) Cuba—Continued E42-A 21.8658 -79.5247 Pegmatite Muscovite K/Ar 96.4 4 All locations from this source are approximate generalities. Pegmatite vein in the area of the Yayabo Formation, northeast of Sancti Spiritus Mountains. Reported age was 85 Ma, recalculated here based on reported analytical data. Somin and others, 1992 ES-5 21.8658 -79.5247 Schist Hornblende K/Ar 42.3 5 All locations from this source are approximate generalities. Mica-hornblende schist, Yayabo Formation from northeast of Sancti Spiritus Mountains. Reported age was 43 Ma, recalculated here based on reported analytical data. Hornblende was only 0.44% K2O. Somin and others, 1992 PE2/15 21.8890 -79.4474 Monzodiorite Zircon U/Pb SHRIMP 83.1 0.8 Unfoliated monzodiorite from drill core located southwest of Sancti Spiritus. 6 grains analyzed. Rojas-Agramonte and others, 2011 Unknown 21.9030 -80.1501 Amphibolite Hornblende K/Ar 42.0 5 Complejo carbonato - terrigeno, Escambray extremo oriental, anfiolita micacea [Carbonate complex - terrigenous, east end Escambray] Location not reported, coordinates here inferred. Age recalculated using constants of Steiger and Jager (1977) assuming old Russian constants were in use. Somin and Millán, 1977 (in Spanish) Unknown 21.9030 -80.1501 Schist Muscovite K/Ar 58.6 3 Complejo carbonato - terrigeno, Escambray extremo oriental, muscovite calc-schist [Carbonate complex - terrigenous, east end Escambray] Location not reported, coordinates here inferred. Age recalculated using constants of Steiger and Jager (1977) assuming old Russian constants were in use. Somin and Millán, 1977 (in Spanish) Unknown 21.9030 -80.1501 Schist Muscovite K/Ar 59.6 4 Complejo carbonato - terrigeno, Escambray extremo oriental, muscovite calc-schist [Carbonate complex - terrigenous, east end Escambray] Location not reported, coordinates here inferred. Age recalculated using constants of Steiger and Jager (1977) assuming old Russian constants were in use. Somin and Millán, 1977 (in Spanish) Unknown 21.9030 -80.1501 Schist Muscovite K/Ar 64.5 4 Complejo carbonato - terrigeno, Escambray extremo oriental, muscovite calc-schist [Carbonate complex - terrigenous, east end Escambray] Location not reported, coordinates here inferred. Age recalculated using constants of Steiger and Jager (1977) assuming old Russian constants were in use. Somin and Millán, 1977 (in Spanish) E37-6 21.9140 -79.4982 Gneiss Zircon U/Pb SHRIMP 92.8 0.7 Fresh, fine-grained, sheet-like meta-trondhjemite body as much as 1 m wide. 5 grains analyzed most of which were low in U and therefore accumulated little radiogenic Pb, which resulted in large errors in the 207Pb/235U and 207Pb/206Pb ratios. However, the 206Pb/238U ratios are precise, and the concordant results can be combined to a mean age of 92.8±0.7 Ma, the time of trondhjemite emplacement. Deformation in this rock must be younger than this age. Rojas-Agramonte and others, 2011 F25-10 21.9143 -79.6395 Metabasite Paragonite K/Ar 68 2 Escambray unit, approximate location. Hatten and others, 1988 C-00-29Ba 21.9208 -78.6739 Altered rock Alunite 40/39 Total fusion 76.6 0.3 Approximate location. Loma Carolina deposit in Caobilla Formation. Kesler and others, 2004 C-00-29Bb 76.6 0.3 F50-7 21.9267 -79.6593 Eclogite Paragonite K/Ar 73 4 Escambray unit, approximate location. Hatten and others, 1988 ATP-1 21.9364 -80.1533 Schist Muscovite K/Ar 59.4 3 All locations from this source are approximate generalities. Muscovite-calcite schist, Loma la Gloria Formation from Trinidad Mountains. Reported age was 60 Ma, recalculated here based on reported analytical data. Somin and others, 1992 CU116 21.9393 -79.5412 Amphibolite Zircon U/Pb SHRIMP 93.0 0.9 Foliated amphibolite exposed in the Yayabo River west of Sancti Spiritus. Only a few idiomorphic zircons recovered from this sample show oscillatory zoning in CL images. Six grains were analyzed and provided concordant results. Four of these are well grouped and define a mean 206Pb/238U age of 93.0±0.9 Ma, whereas two grains, optically indistinguishable from the others, are much older at 315±2 and 903±7 Ma and are interpreted as xenocrysts. Rojas-Agramonte and others, 2011 Zircon U/Pb SHRIMP 315 2 Zircon U/Pb SHRIMP 903 7 ASP-1 21.9417 -79.5822 Schist Muscovite K/Ar 59.3 4 All locations from this source are approximate generalities. Calcite-muscovite schist from complex of Escambray, Caracusey lithofacies; northeast of Sancti Spiritus Mountains. Reported age was 61 Ma, recalculated here based on reported analytical data. Somin and others, 1992 ASP-2 21.9417 -79.5822 Schist Muscovite K/Ar 66.4 4 All locations from this source are approximate generalities. Calcite-muscovite schist from complex of Escambray, Caracusey lithofacies; northeast of Sancti Spiritus Mountains. Reported age was 66 Ma, recalculated here based on reported analytical data. Somin and others, 1992 C57 21.9443 -79.4971 Quartz monzonite Unknown K/Ar 85 1 Poorly foliated quartz monzonite, drill core near Sancti Spiritus; Manicaraguan Batholith. Hatten and others, 1988; Rojas-Agramonte and others, 2011 Zircon U/Pb SHRIMP 87.2 1.2 Poorly foliated quartz monzonite, drill core near Sancti Spiritus; Manicaraguan Batholith. 6 grains analyzed. Rojas-Agramonte and others, 2011 TIMS Multigrain 93.0 10 Poorly foliated quartz monzonite, drill core near Sancti Spiritus; Manicaraguan Batholith. Bibikova and others, 1988; Rojas- Agramonte and others, 2011 8 Sample no. Latitude (decimal degrees) Longitude (decimal degrees) Rock type Mineral Method Age (Ma) Analytical error (Ma) Comments Reference(s) Cuba—Continued C60 21.9609 -79.4967 Quartz monzonite Zircon TIMS Multigrain 89.3 0.45 Foliated quartz monzonite, drill core west of Sancti Spiritus; Manicaraguan Batholith. Two splits run, coarse and fine, yielding 89.4 Ma and 89.1 Ma, respectively, both with 0.45 error. Rojas-Agramonte and others, 2011 89.3 2 Foliated quartz monzonite, drill core west of Sancti Spiritus; Manicaraguan Batholith. Hatten and others, 1988; Rojas-Agramonte and others, 2011 7CF3A 21.9631 -80.1880 Greenschist Phengite 40/39 Total fusion 57.20 1.80 Approximate location derived from poor map. La Sierrita Nappe, metacarbonate. 7 grains averaged. Despaigne-Diaz and others, 2016 CU114 21.9683 -79.5045 Amphibolite Zircon U/Pb SHRIMP 93.5 1.0 Strongly deformed amphibolite derived from pyroclastic rock of dacitic composition from the Mabujina metavolcanic suite. 6 grains analyzed, 4 yielding 93.5±1.0 Ma and 2 inherited, rounded grains yielded 471±4 and 1,059±8 Ma. Rojas-Argamonte and others, 2011 471 4 1,059 8 F94 21.9748 -79.8560 Blueschist Glaucophane K/Ar 56 3 Escambray unit, approximate location. Hatten and others, 1988 Phengite K/Ar 66 1 F94-1 21.9748 -79.8560 Blueschist Phengite K/Ar 68 1 Escambray unit, approximate location. Hatten and others, 1988 Glaucophane K/Ar 210 13 LV69 21.9808 -79.7015 Eclogite Whole rock Rb/Sr 65.1 3.0 MSWD = 83. An age of 66.0±1.7 Ma (MSWD = 5.3); intercept at 0.705721±0.000046 is obtained when garnet analytical point is removed. Sancti Spiritus Dome, collected from eclogitic lens in serpentinite. Matrix is dominated by sodic-calcic amphibole and epidote. Minerals found in sample are garnet, sodic-calcic amphibole, omphacite, epidote, phengite, glaucophane, quartz, rutile, and apatite. Garnet is generally euhedral and often rimmed by chlorite. However, some unaltered rims display textural equilibrium with garnet, omphacite, phengite, and sodic-calcic amphibole. Garnet cores are rich in quartz, rutile, apatite, epidote, graphite, and blue-green amphibole inclusions. Locally, glaucophane is present at edge of garnet rimmed by chlorite, attesting to blueschist-facies overprint. Approximate location. Schneider and others, 2004 Barroisite 40/39 Plateau 69.1 1.3 Sancti Spiritus Dome, collected from eclogitic lens in serpentinite; 95.5% Ar release for barroisite and 93.0% of Ar released for phengite. Matrix is dominated by sodic-calcic amphibole and epidote. Minerals found in sample are garnet, sodic-calcic amphibole, omphacite, epidote, phengite, glaucophane, quartz, rutile, and apatite. Garnet is generally euhedral and often rimmed by chlorite. However, some unaltered rims display textural equilibrium with garnet, omphacite, phengite, and sodic-calcic amphibole. Garnet cores are rich in quartz, rutile, apatite, epidote, graphite, and blue- green amphibole inclusions. Locally, glaucophane is present at edge of garnet rimmed by chlorite, attesting to blueschist-facies overprint. Approximate location. Phengite 40/39 Plateau 69.3 0.6 CU16 21.9917 -79.6927 Eclogite Phengite 40/39 Plateau 71.0 0.7 99.2% of Ar released. Schneider and others, 2004 Paragonite 40/39 Total fusion 69.9 0.7 Paragonite grain from sample was mostly degassed in two steps because of its low K concentration; however, it did yield total gas age of 68.9±0.7. LV66 21.9917 -79.6927 Eclogite Isochron Rb/Sr 65 15 MSWD = 206. (Excluding garnet and clinopyroxene), isochron age is 69.7±0.8 Ma MSWD±0.49, (87Sr ⁄86Sr) ratio of 0.705511±0.000010. Garnet, omphacite, epidote, glaucophane, paragonite, phengite, quartz, rutile, and albite. Epidote and white mica define main foliation. Garnet occurs as (1) large porphyroblasts (1–3 mm) with inclusion-rich cores (inclusions of quartz, rutile, apatite and graphite) surrounded by inclusion-poor rims, and (2) inclusion-poor small neoblasts (100–25 µm). Large porphyroblasts are optically zoned with a darker core and appear to be in textural equilibrium with omphacite, epidote, and mica. Glaucophane is optically zoned suggesting three growth stages. There is a clear inner core, a dark outer core edged by omphacite and garnet, and a clear rim that includes omphacite and garnet. Epidote is present as inclusions in garnet and in matrix. Loma la Gloria Formation, approximate location. Schneider and others, 2004 LV66 21.9917 -79.6927 Eclogite Phengite 40/39 Plateau 68.2 0.6 Loma la Gloria Formation: 99.2% of Ar released. Spot fusion analyses on second grain gave ages between 72.2 and 66.6 Ma. Approximate location. Schneider and others, 2004 F94 21.9945 -79.9803 Altered rock Muscovite K/Ar 67.7 1 All locations from this source are approximate generalities. Winchite-garnet-albite rock, Algarrobo Formation from northeast of Trinidad Mountains. Ages recalculated based on reported analytical data. Second albite split was only 0.039% K2O; date is quite dubious. Somin and others, 1992 Amphibole K/Ar 69.1 2 Albite K/Ar 159.6 15 GME-81-3 21.9945 -79.9803 Blueschist Paragonite K/Ar 66.5 8 All locations from this source are approximate generalities. Glaucophane schist, Algarrobo Formation from northeast of Trinidad Mountains. Age recalculated based on reported analytical data. Somin and others, 1992 9 Sample no. Latitude (decimal degrees) Longitude (decimal degrees) Rock type Mineral Method Age (Ma) Analytical error (Ma) Comments Reference(s) Cuba—Continued SM-47 22.0090 -80.2782 Greenschist Phengite 40/39 Total fusion 59.4 0.8 Approximate location derived from poor map. La Sierrita Nappe, carbonate mica schist. 7 of 11 grains averaged. Isochron reflects all 11 grains. Despaigne-Diaz and others, 2016 F89-1 22.0203 -79.9905 Eclogite Paragonite K/Ar 74 4 Escambray unit, approximate location. Hatten and others, 1988 Hornblende K/Ar 255 7 Zircon TIMS Multigrain 102 2 G-104 22.0217 -80.2768 Greenschist Phengite 40/39 Total fusion 58.01 1.1 Approximate location derived from poor map. La Sierrita Nappe, carbonate mica schist. 8 grains averaged. Despaigne-Diaz and others, 2016 G-103 22.0226 -80.2768 Greenschist Phengite 40/39 Total fusion 56.32 0.40 Approximate location derived from poor map. La Sierrita Nappe, calcschist. 13 grains averaged. Despaigne-Diaz and others, 2016 G-102 22.0260 -80.2737 Greenschist Phengite 40/39 Total fusion 56.7 1.84 Approximate location derived from poor map. La Sierrita Nappe, calcschist. 10 grains averaged. Despaigne-Diaz and others, 2016 G2057 22.0270 -79.4439 Pegmatite Isochron Rb/Sr 74 1 Approximate location of Yayabo Quarry based on Google Earth. Isochron age combining whole rock and fine-grained white mica. Interpreted as a cooling age. Initial ratio of 0.7046. Grafe and others, 2001 Isochron Rb/Sr 81.8 0.4 Isochron age combining whole rock, multiple phases of coarse-grained white mica, and an indeterminate phase. Interpreted as a crystallization age. Initial ratio of 0.7034. G2061 22.0270 -79.4439 Pegmatite Muscovite 40/39 Total fusion 72.2 0.6 Approximate location of Yayabo Quarry based on Google Earth. Interpreted as a cooling age (350 to 400 °C). Grafe and others, 2001 Isochron Rb/Sr 74.6 0.7 Isochron age combining whole rock, multiple phases of fine-grained white mica, and one phase of coarse-grained white mica. Interpreted as a metamorphic age. Initial ratio of 0.7051. Isochron Rb/Sr 80 1 Isochron age combining whole rock and one phase of coarse-grained white mica. Interpreted as a crystallization age. Initial ratio of 0.7039. J77 22.0277 -79.8185 Orthogneiss Biotite K/Ar 73 1 Meta-granitoid, orthogneiss, approximate location. Hatten and others, 1988 Hornblende K/Ar 84 3 SR-65 22.0309 -80.2543 Greenschist Phengite 40/39 Total fusion 37 7 Approximate location derived from poor map. La Sierrita Nappe, carbonate mica schist. 7 grains averaged. Considered spurious age, mixing S1 and S2 foliations. Despaigne-Diaz and others, 2016 SR-65b 22.0317 -80.2519 Greenschist Phengite 40/39 Total fusion 57.4 3 Approximate location derived from poor map. La Sierrita Nappe, carbonate mica schist. 9 grains averaged. Despaigne-Diaz and others, 2016 J66-1 22.0408 -79.8498 Orthogneiss Biotite K/Ar 70 1 Meta-granitoid, orthogneiss, approximate location. Hatten and others, 1988 Hornblende K/Ar 95 2 F66-1 22.0483 -79.8906 Metadiorite Zircon TIMS Multigrain 93.8 0.47 Metadiorite vein in amphibolite was collected 1.5 km NW of Guinıa de Miranda and some 200 m west of sample F68, also in the Jicaya River. Xenoliths of amphibolite occur with sharp contacts within the metadiorite, although schistosity seems common to both rocks. Two zircon fractions, one representing a coarse “tap” and one a fine “tap,” were analyzed by conventional TIMS technique and yielded identical 206Pb/238U ages of 94.1±0.47 and 93.5±0.47 Ma, respectively. This is structurally one of the youngest of the Rio Jicaya granitoids, since it cuts an older foliation in the intruded amphibolites. Rojas-Agramonte and others, 2011 J66-4 22.0498 -79.8335 Orthogneiss Biotite K/Ar 69 2 Meta-granitoid, orthogneiss, approximate location. Hatten and others, 1988 Hornblende K/Ar 78 3 J68-3 22.0527 -79.8528 Pegmatite Muscovite K/Ar 84 1 Undeformed pegmatite cutting amphibolite. Manicaragua unit, approximate location. Hatten and others, 1988 SM-45 22.0585 -80.2828 Greenschist Phengite 40/39 Total fusion 60.56 0.66 Approximate location derived from poor map. La Sierrita Nappe, carbonate mica schist. 6 grains averaged. Despaigne-Diaz and others, 2016 CU32 22.0483 -79.8433 Gneiss Zircon U/Pb SHRIMP 122.1 2.1 Massive but well-foliated trondhjemite, was collected in the Jicaya River just south of F77. The zircons are idiomorphic and stubby to long prismatic and show excellent magmatic zoning under CL. Eight grains were analyzed on SHRIMP II, and all analyses produced concordant results. Seven grains define a cluster with a mean 206Pb/238U age of 112.1±2.1 Ma, which we consider reflects the time of trondhjemite emplacement. One grain is significantly older and has a concordant 207Pb/206Pb age of 1045±17 Ma which we interpret as an inherited zircon xenocryst. Rojas-Agramonte and others, 2011 1,045 17 CU36503 22.0502 -79.845 Trondhjemite Zircon U/Pb SHRIMP 84.2 0.8 Gray-whitish, fine- to medium-grained trondhjemite (quartz-bearing hornblende diorite) collected near Guinıa de Miranda in the Jicaya River. 8 grains analyzed. Rojas-Agramonte and others, 2011 SM-47 22.05968 -80.2782 Greenschist Phengite 40/39 Total fusion 56.8 1.1 Approximate location derived from poor map. La Sierrita Nappe, carbonate mica schist. 4 of 11 grains averaged. Isochron reflects all 11 grains. Despaigne-Diaz and others, 2016 10 Sample no. Latitude (decimal degrees) Longitude (decimal degrees) Rock type Mineral Method Age (Ma) Analytical error (Ma) Comments Reference(s) Cuba—Continued F012 22.06228 -79.8855 Granodiorite White mica 40/39 Total fusion 73.8 0.5 Approximate location based on Google Earth. Fine-grained white mica, interpreted as cooling age, 350 to 400 °C. Grafe and others, 2001 Isochron Rb/Sr 82.1 0.6 Isochron age based on plagioclase, whole rock, and multiple phases of white mica. Interpreted as metamorphic age. Initial ratio 0.70335. F019 22.06228 -79.8855 Gneiss Muscovite Rb/Sr 73 3 Approximate location based on Google Earth. Biotite gneiss. Table 8 in Grafe and others (2001) reports this is a mineral age based on fine-grained white mica. Interpreted as cooling age. Table 6 in Grafe and others (2001) reports this is an isochron age combining plagioclase, whole rock, and biotite and gives an initial ratio of 0.70297. Grafe and others, 2001 S141 22.065 -79.8869 Pegmatite White mica Rb/Sr 73 1 Approximate location based on Google Earth. Mineral age based on fine-grained white mica from shear zones. Interpreted as a cooling age. Initial ratio 0.70336. Grafe and others, 2001 Isochron Rb/Sr 84.9 0.9 Isochron age based on contributions from whole rock, fine-grained white mica, and one phase of coarse-grained white mica. Interpreted to be metamorphic age. Initial ratio 0.70334. Isochron Rb/Sr 87.6 0.4 Isochron age based on contributions from whole rock and multiple phases of coarse white mica. Interpreted to be crystallization age. Initial ratio 0.70334. F68 22.0653 -79.8867 Orthogneiss Zircon U/Pb 110 10 Trondhjemitic orthogneiss. Earliest phase of magmatism. Bibikova and others, 1988; Rojas- Agramonte and others, 2011 F68 22.0653 -79.8867 Orthogneiss Zircon U/Pb SHRIMP 132.9 1.4 Trondhjemitic orthogneiss, 6 grains. Earliest phase of magmatism. Rojas-Agramonte and others, 2011 F68 22.0653 -79.8867 Orthogneiss Zircon TIMS Multigrain 133.0 2.0 Trondhjemitic orthogneiss. Earliest phase of magmatism. Rojas-Agramonte and others, 2011 F77 22.0654 -79.8904 Gneiss Zircon U/Pb 110 15 Age reported here is that determined by Bibikova and others (1988). Using conventional TIMS techniques, Bibikova and others (1988) analyzed one multigrain zircon fraction from the same sample and reported a 206Pb/238U age of 108±15 Ma. They combined this analysis with data for another multigrain fraction from nearby sample F77 (206Pb/238U age of 115±10 Ma) and reported a mean age of 110±15 Ma for both samples, which is cited in the literature as representing Mabujina granitoid magmatism (e.g., Millán 1996; Sukar and Perez 1997). However, a plot in a concordia diagram of the two samples analyzed by Bibikova and others (1988) shows these analyses to be strongly discordant, and in such cases 206Pb/238U ages are not geologically meaningful. The discordancy may partly be due to Pb loss and/or inheritance, depending on the balance between these two parameters. Sample collected in the Jicaya River some 2 km east of Guinıa de Miranda village. Bibikova and others, 1988; Rojas- Agramonte and others, 2011 F77 22.0654 -79.8904 Gneiss Zircon U/Pb Multigrain 123.9 0.62 Tonalitic gneiss, bulk sample. Collected in the Jicaya River some 2 km east of Guinıa de Miranda village; relict magmatic features are less clear than in above cases. A bulk fraction of this sample was analyzed conventionally in Santa Barbara and provided a 206Pb/238U age of 123.9±0.62 Ma, whereas inheritance is clearly indicated by a 207Pb/206Pb age of 225±8 Ma for this sample. Rojas-Agramonte and others, 2011 F009 22.0661 -79.8849 Pegmatite Isochron Rb/Sr 86.2 0.5 Approximate location based on Google Earth. Isochron age based on coarse-grained feldspar, whole rock, and multiple phases of coarse-grained white mica. Initial ratio 0.70342. Grafe and others, 2001 S157 22.0747 -79.9761 Pegmatite Isochron Rb/Sr 84.4 4 Approximate location of Road Manicaragua site based on Google Earth. Isochron age combining feldspar, whole rock, and white mica. Interpreted as a mixing of crystallization and metamorphic age. Initial ratio of 0.70351. Grafe and others, 2001 PM