Tectonic implications of a myionitic granite in the lower structural levels of the Tierra Caliente complex (Guerrero terrane), southern Mexico

Abstract:

Two sequences of pre-Tertiary volcano-sedimentary rocks with island arc affinities have been differentiated in the Zacazonapan area, State of Mexico. These rocks are part of the Tierra Caliente complex or the tectonostratigraphic Guerrero terrane. The lower sequence, grouped as pre-Cretaceous metamorphic rocks, is essentially made up of about 1,500 m of carbonaceous phyllite interbedded with greenschist (chlorite-actinolite-epidote schist) and metarhyolite lenticular bodies. This package is characterized by penetrative foliation associated with recumbent tight to isoclinal folding under greenschist facies conditions. The upper sequence consists of argillaceous limestone, black slate and graywacke, and andesitic pillow lavas with tuffaceous and siliceous sediments. This package shows different degrees of deformation. The pillow-lavas are non-flattened or slightly flattened with an incipient development of fracture …

Año de publicación:

1990

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