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The Mesozoic medium-grade metamorphic terrain on the eastern part of Margarita Island, Venezuela, can be divided into a lower “greenstone division” and the conformably overlying Juan Griego Group. Highly varied rocks of eclogitic affinity, mostly found in situ, occur in both units but are most common in the greenstone division. The stratigraphic distribution of eclogitic and amphibolitic lenses within the Juan Griego Group resembles that of the lithologically equivalent Caracas Group near Puerto Cabello and Caracas on the Venezuelan mainland. The greenstone division and its eclogites on Margarita are interpreted to represent an original accumulation of basic volcanic material on...

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