Rodingites found in dike-gabbro associated rocks in the area of Yaguaneque
Keywords:
rodingite, retrograde metamorphism, petrography, calcic metasomatism, ophiolites.Abstract
Ophiolitic rocks are found abundantly in the area of Yaguaneque, which is part of the Moa Baracoa massif. Dike rocks occur inside basic bodies (gabbro). Dike rocks contain tremolite-actinolite, chlorite, epidote, clinochlore and zoisite corresponding to green schist facies, indicating that metasomatic processes occurred in the basic rocks as well as retrograde metamorphism. Rodingites in association with gabbros occur in the form of lens or dikes in light color, with thicknesses varying from 30 to 70 cm and up to 1,1 m in length. The mineralogical composition is: clinochlore, calcic amphiboles (tremolite-actinolite), zoisite, epidote and chlorite. It is inferred that these rocks are the product of calcic metasomatism, contemporaneous to the serpentinization of ultrabasic rocks in two events: the first one associated with hydrothermal metamorphism as evidenced by the preservation of magmatic textures, the second one, during the tectonic emplacement, under the P-T conditions associated with greenschist facies, which resulted in retrograde metamorphism where supposedly garnets were transformed into chlorites. Gabbros are box rocks having the following mineralogical composition: plagioclase (anorthite), clinopyroxenes (diopside) and subordinately, olivine which occurs in the shape of relictic grains with an alteration edge to chlorite.Downloads
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