Abstract
Reconnaissance studies of early island-arc intrusions in the Cordillera Central of the Dominican Republic demonstrate that these rocks are mainly hornblende tonalite with lesser amounts of hornblende diorite, quartz diorite, granodiorite and quartz monzonite. Two plutons (El Bao, Medina) are petrographically and chemically homogeneous, whereas two others (El Rio and Loma de Cabrera) are compositionally heterogeneous. Samples from these intrusions range in SiO2 from 49 to 70% with most rocks in the 59 to 62% range. K2O ranges from 0.24 to 3% and averages 1.2%. Cu, Zn, Co, Ni, V and possibly Cr decrease with increasing SiO2. Rb/Sr values for the intrusions are low but variable. Present-day 87Sr/86Sr values range from 0.7031 to 0.7045 for the El Bao and Loma de Cabrera batholiths and 0.7033 to 0.7091 for the Medina stock. These data do not generate isochrons. The Cordillera Central tonalite intrusions are the most abundant plutonic rock type in the Greater Antilles, although small, younger granodiorite and quartz monzonite stocks are present. The Cordillera Central intrusions are lower in SiO2, K2O, Rb, and Sr than the average composition of the Sierra Nevada batholith, but they are similar to the tonalites and trondjhemites from the western margin of the Sierra Nevada batholith. The low Rb/Sr ratios and low initital Sr87/Sr86 ratios for the Cordillera Central intrusions combined with the high liquidus temperatures required for the generation of tonalite magmas strongly favor a subcrustal source for these magmas in an island-arc setting.
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References
Blesch, R.: Geologic map of the Dominican Republic. In: Reconocimiento y evaluacion de los recursos naturales de la Republica Dominicana: Pan American Union, Washington, D.C., 1967
Bowin, C.O.: Geology of the Central Dominican Republic. Geol. Soc. Am. Mem. 98, 11–84 (1966)
Bowin, C.O.: The geology of Hispaniola. In: Ocean basins and margins (A.E.M. Nairn and F.G. Stehli, eds.), Vol. 3. Gulf of Mexico and Caribbean: Plenum Press 1975
Burke, K., Fox, P.J.: Caribbean ocean floor as a hard-to-subduct remnant. Geol. Soc. Am. Abs. Prog. 8, No. 6, 795–796 (1976)
Cheilletz, A., Lewis, V.F.: Contribution a l'etude de la bordure meridionale du Massif du Nord, Nord-est d'Haiti. Proc. of 1975 Carib. Geol. Conf. Guadeloupe 1975
Cox, D.P., Marvin, R.F., McGonigle, J.W., McIntyre, D.H., Rogers, C.L.: Potassium-argon geochrononology of metamorphic, igneous and hydrothermal events in Puerto Rico and the Virgin Islands. Res. U.S.G.S., in press 1977
Dodge, F.C.W.: Trace-element contents of some plutonic rocks of the Sierra Nevada batholith. U.S. Geol. Surrey Bull. 1314-F, p. 13 (1972)
Donnelly, T.W.: Evolution of the eastern Antillean island arc. Am. Ass. Petrol. Geol. Bull. 48, 680–696 (1964)
Donnelly, T.W., Rogers, J.J.W., Pushkar, P., Armstrong, R.L.: Chemical evolution of the igneous rocks of the eastern West Indies. Geol. Soc. Am. Mem. 130, 181–224 (1971)
Jakes, P., White, A.J.R.: Major and trace element abundances in volcanic rocks of orogenic areas. Geol. Soc. Am. Bull. 83, 29–40 (1972)
Kesler, S.E.: Petrology of the Terre-Neuve igneous province, northern Haiti. Geol. Soc. Am. Mem. 130, 119–138 (1971)
Kesler, S.E., Sutter, J.F., Issigonis, M.J., Jones, L.M., Walker, R.L.: Evolution of porphyry copper mineralization in an oceanic island arc: Panama Econ. Geol. 72, in press 1977b
Kesler, S.E., Sutter, J.F., Jones, L.M., Walker, R.L.: Early Cretaceous basement rocks in Hispaniola. Geology 5, 245–247 (1977a)
Khudoley, D.M., Meyerhoff, A.A.: Paleogeography and geological history of Greater Antilles. Geol. Soc. Am. Mem. 129, p. 199 (1971)
Kistler, R.W., Peterman, Z.E.: Variations in Sr, Rb, K, Na and initital Sr87/Sr86 in Mesozoic granitic rocks and intruded wall rocks in central California. Geol. Soc. Am. Bull. 84, 3489–3512 (1973)
Longshore, J.D.: Chemical and mineralogical variations in the Virgin Islands batholith and its associated wall rocks. Unpublished Ph.D. dissertation, Rice Univ. p. 94 (1965)
Malfait, B.T., Dinkelman, M.G.: Circum-Caribbean tectonic and igneous activity and the evolution of the Caribbean plate. Geol. Soc. Am. Bull. 83, 251–272 (1972)
Miyashiro, A.: Volcanic rock series in island arcs and active continental margins. Am. J. Sci. 274, 321–355 (1974)
Palmer, H.C.: Geology of the Moncion-Jarabacoa area, Dominican Republic. Unpublished Ph.D. dissertation, Princeton University, p. 256 (1963)
Peacock, M.A.: Classification of igneous rock series. J. Geol. 39, 421–426 (1931)
Piwinskii, A.J., Wyllie, P.J.: Experimental studies of igneous rock series. J. Geol. 78, 52–76 (1970)
Pushkar, P.: Strontium isotope ratios in volcanic rocks of three island arc areas. J. Geophys. Res. 73, 2701–2714 (1968)
Reed, A.J.: Geology of the Bog Walk Quadrangle, Jamaica. Geol. Survey Dept. of Jamaica Bull. No. 6, p. 54 (1966)
Weyl, R.: Geologie der Antillen p. 410, Berlin: Gebruder Borntraeger 1966
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Kesler, S.E., Lewis, J.F., Jones, L.M. et al. Early island-arc intrusive activity, Cordillera Central, Dominican Republic. Contr. Mineral. and Petrol. 65, 91–99 (1977). https://doi.org/10.1007/BF00373574
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DOI: https://doi.org/10.1007/BF00373574