Implicaciones tectonomagmáticas y edad de las toleítas de arco-isla, boninitas y rocas ácidas relacionadas de la formación Los Ranchos, Cordillera Oriental, República Dominicana

Autores/as

  • J. Escuder Viruete Instituto Geológico y Minero de España
  • A. Díaz de Neira INYPSA, Informes y Proyectos S.A.
  • P. P. Hernaiz Huerta INYPSA, Informes y Proyectos S.A.
  • J. García-Senz INYPSA, Informes y Proyectos S.A. - Depto. Geodinámica. Fac. Geología. Universidad Barcelona
  • J. Monthel BRGM
  • M. Joubert BRGM
  • E. Lopera Instituto Geológico y Minero de España
  • T. Ullrich Pacific Centre for Isotopic and Geochemical Research. University of British Columbia
  • R. Friedman Pacific Centre for Isotopic and Geochemical Research. University of British Columbia
  • D. Weis Pacific Centre for Isotopic and Geochemical Research. University of British Columbia
  • A. Pérez-Estaún I.C.T. Jaume Almera-CSIC

DOI:

https://doi.org/10.21701/bolgeomin.118.2.003

Palabras clave:

arco isla Caribeño, boninitas, edades U-Pb, rocas ácidas, toleítas de arco isla

Resumen


Localizada en la Cordillera Oriental de la República Dominicana, la Formación Los Ranchos de edad Cretácico Inferior, comprende una potente secuencia de rocas volcánicas y volcanoclásticas, intruida por batolitos tonalíticos, pequeños plutones gabro-dioríticos y diques máficos. De base a techo se distinguen principalmente tres unidades estratigráficas cartografiables: la basáltica inferior, la riodacítica intermedia y la basáltica superior. Los estudios combinados cartográficos, estratigráficos, geoquímicos, isotópicos Sr-Nd y geocronológicos U-Pb/Ar-Ar han mostrado que las rocas máficas de la Fm Los Ranchos incluyen boninitas (grupo III) y basaltos toleíticos de arco isla empobrecidos en LREE (grupo II) en la unidad inferior, los cuales se interpretan como co-genéticas, y toleítas de arco isla normales (grupo I) en la unidad superior. La fuente para estas rocas fue un manto variablemente empobrecido, con una componente subductiva superpuesta. Las edades Aptienses U-Pb en zircones de riodacitas de la unidad intermedia (116,0±0,8 Ma) y de tonalitas del batolito de Zambrana (115,5±0,3 Ma) contemporáneas, de características geoquímicas equivalentes, permite establecer una relación genética entre las rocas volcánicas ácidas de la Fm Los Ranchos y el voluminoso plutonismo tonalítico que intruye los niveles estratigráficos más bajos. Las riolitas pobres en K y los batolitos tonalíticos son interpretados como producto de la fusión secundaria de la base del arco. Las edades de plateau 40Ar/39Ar de hornblenda en cuatro batolitos tonalíticos son Albienses (109-106 Ma) e interpretadas como de su enfriamiento final post-emplazamiento, previo a la sedimentación Albiense de las calizas arrecifales discordantes de la Fm Hatillo. En este contexto, las boninitas y toleitas de arco isla empobrecidas de la unidad inferior fueron generadas durante la iniciación de la zona de subducción, y las toleitas normales de la unidad superior representan la posterior estabilización del frente volcánico.

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2007-06-30

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Escuder Viruete, J., Díaz de Neira, A., Hernaiz Huerta, P. P., García-Senz, J., Monthel, J., Joubert, M., Lopera, E., Ullrich, T., Friedman, R., Weis, D., & Pérez-Estaún, A. (2007). Implicaciones tectonomagmáticas y edad de las toleítas de arco-isla, boninitas y rocas ácidas relacionadas de la formación Los Ranchos, Cordillera Oriental, República Dominicana. Boletín Geológico Y Minero, 118(2), 195–220. https://doi.org/10.21701/bolgeomin.118.2.003

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