Geochemical evidence for possible trench provenance and fluid-rock histories, Cordillera de la Costa eclogite belt, Venezuela
Published:January 01, 2005
Sorena S. Sorensen, Virginia B. Sisson, Hans G. Avé Lallemant, 2005. "Geochemical evidence for possible trench provenance and fluid-rock histories, Cordillera de la Costa eclogite belt, Venezuela", Caribbean-South American plate interactions, Venezuela, Hans G. Avé Lallemant, Virginia B. Sisson
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The Cordillera de la Costa eclogite belt, exposed along the Caribbean coastline of Venezuela near Puerto Cabello, consists of lensoid bodies and boudins of high pressure-temperature (P-T) metabasite in a heterogeneous matrix of mica schist and metacarbonate rocks. The metabasite bodies consist of eclogite and its retrogression products. Data for less mobile elements indicate that protoliths ranged from normal mid-oceanic-ridge basalt (N-MORB), to enriched (E)-MORB, to cumulate gabbro. Some eclogites and their retrogression products are enriched in large ion lithophile elements (LILE). The covariations of K and Ba are evidence that these elements were most likely incorporated into...