Metamorphic evolution of the exotic blocks from Manacas Formation in the location of Las Terrazas, Artemisa Province
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Abstract
In Las Terrazas locality, Artemisa province, exotic blocks formed by metamorphic rocks have been found in the chaotic deposits belonging to the Olistostroma Vieja member of the Manacas Formation. The present work consists of a detailed petrographic study to determine the mineralogical composition, the texture, alterations and deformations, as well as the trajectory of pressure and temperature (P / T) suffered by said blocks and their metamorphic evolution. The minerals present in the samples are enstatite, hypersten, diopside, augita and garnet, associated with the granulitic facie. The minerals associated with the amphibolite facies are hornblende and plagioclase; and those associated with the greenschist facie are tremoliht-actinoliht and chlorite. These samples generally have a nematoporfidoblastic texture, with alterations of chloritization and uralitization, which gives evidence that a metamorphism occurred towards the granuliticfacies, with a retrogradation to greenschist facie. Prograde metamorphism occurred in a subduction zone between two oceanic crusts, which reached a depth of approximately 40 km, with a temperature of 800 ° C and a pressure of 12 Kb marked by the wide development of enstatite phenocrysts (higher mineral). P / T) so it canbe taken as the peak of the gradient and the beginning, product of an exhumation process, of retrograde metamorphism.
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