Tectonomagmatic implications and ages of caribbean island-arc tholeiites, boninites and related felsic rocks, Cordillera Oriental, Dominican Republic

J. Escuder Viruete; A. Díaz de Neira; P. P. Hernaiz Huerta; J. García-Senz; J. Monthel; M. Joubert; E. Lopera; T. Ullrich; R. Friedman; D. Weis; A. Pérez-Estaún

doi:10.21701/bolgeomin.118.2.003

Authors

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

Keywords:

boninite, Caribbean island arc, felsic rocks, island arc tholeiite, U-Pb ages

Abstract

Located in the Cordillera Oriental of the Dominican Republic, the Early Cretaceous Los Ranchos Fm comprises a thick sequence of volcanic and volcaniclastic rocks with variable geochemical characteristics, which is intruded by tonalite batholiths, minor gabbro/diorite plutons and mafic dykes. From top to bottom, three main stratigraphic units have been mapped: upper basaltic, intermediate rhyodacitic and lower basaltic. Combined detailed mapping, stratigraphy, geochemistry, Rb-Sr/Sm-Nd isotopic studies and U-Pb/Ar-Ar geochronology have shown that mafic rocks of the Los Ranchos Fm include boninites (group III) and LREE-depleted tholeiitic island arc basalts (group II) in the lower unit, which are interpreted to be genetically related, and normal island arc tholeiites (group I) in the upper unit. The source for these rocks was variably depleted mantle, overprinted by a subduction zone component. Contemporaneous Aptian U-Pb zircon ages of rhyodacite from the intermediate unit (116.0±0.8 Ma) and tonalite from Zambrana batholith (115.5±0.3 Ma), with equivalent trace-element geochemical characteristics, argue for a genetic link between felsic volcanic rocks of the Los Ranchos Fm and the voluminous tonalite magmatism that intrude their lower stratigraphic levels. Low-K rhyolites and tonalite batholiths are interpreted as products of secondary melting at the base of thickened early arc crust. ⁴⁰Ar/³⁹Ar plateau ages of hornblende in four tonalite batholiths are Albian (109-106 Ma) and interpreted as recording the final cooling after emplacement, previously to the Albian sedimentation of uncomformably reef limestones of the Hatillo Fm. In this context, LREE-depleted IAT and boninites of lower basaltic unit formed during subduction zone initiation, and the normal IAT of the upper unit represent the posterior stabilization of the volcanic front.

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