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Palabras clave
petrografía
metamorfismo de presión alta
subducción
Complejo Acatlán
suite Piaxtla
Paleozoico
México
Cómo citar
Citas en Dimensions Service
Resumen
La suite de presión alta Piaxtla (Complejo Acatlán) en el sur de México representa parte de una zona de subducción antigua. Esta suite consiste en fragmentos de afinidad oceánica y continental que contienen relictos en facies de esquisto azul y eclogita. El mapeo geológico de tres áreas clave mostró que las rocas y las asociaciones minerales varían sistemáticamente y de forma predecible, permitiendo dividir la suite Piaxtla en dos diferentes unidades de temperatura baja y media (i.e., facies de esquisto azul y eclogita, respectivamente). Las relaciones de campo sugieren que la intercalación de rocas dentro de cada unidad resultó de una primera etapa de deformación relacionada con la subducción (D1), la cual se vio afectada por dos fases de deformación subsecuentes (D2 y D3). En la unidad de presión alta y temperatura baja, las rocas metasedimentarias son predominantes y composicionalmente heterogéneas, y comparten una historia común a presión alta con los esquistos azules que contienen. La unidad de presión alta y temperatura media se caracteriza por la abundancia de gneises graníticos y por una secuencia metasedimentaria relativamente homogénea que también es co-metamórfica con las eclogitas asociadas. En conjunto, las relaciones de campo y los datos petrográficos indican que las unidades de temperatura baja y media de la suite Piaxtla pudieron haber evolucionado como fragmentos tectónicos independientes relativamente coherentes.
Citas
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Esta obra está bajo una licencia internacional Creative Commons Atribución 4.0.
Derechos de autor 2025 Roberto Maldonado, Mariano Elías-Herrera, Guillermo Espejo-Bautista, Israel Ramírez-Serdán, Duban Esteban Gomez-Gomez, Angela Prado-Ordoñez, Consuelo Macías-Romo, José Luis Sánchez-Zavala