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P-T-t constraints on exhumation following subduction in the Rheic Ocean from eclogitic rocks in the Acatlan Complex of southern Mexico


, : P-T-t constraints on exhumation following subduction in the Rheic Ocean from eclogitic rocks in the Acatlan Complex of southern Mexico. Special Paper - Geological Society of America 423(Pages 489-509

The Piaxtla Suite of the Acatlan Complex (southern Mexico) has previously been considered a vestige of the Iapetus Ocean that underwent eclogite-facies metamorphism during Late Ordovician subduction and exhumation. Study of granitoid, mafic, and metasedimentary rocks of the Asis Lithodeme of the Piaxtla Suite reveals a complex tectonothermal history involving: (1) eclogite-facies syntectonic metamorphism preserved as aligned omphacite in mafic lenses dated at 346+ or -3 Ma (concordant U-Pb zircon age), which is inferred to result from subduction; (2) polyphase deformation involving WSW-ENE tectonic transport under amphibolite-facies conditions accompanied by migmatization due to decompression melting dated at ca. 347-330 Ma (SHRIMP [sensitive high-resolution ion microprobe] zircon ages); (3) continued deformation under greenschist facies; and (4) development of several phases of late folds and crenulation cleavage.

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