Implicaciones tectonomagmáticas y edad de las toleítas de arco-isla, boninitas y rocas ácidas relacionadas de la formación Los Ranchos, Cordillera Oriental, República Dominicana
DOI:
https://doi.org/10.21701/bolgeomin.118.2.003Palabras clave:
arco isla Caribeño, boninitas, edades U-Pb, rocas ácidas, toleítas de arco islaResumen
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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