Supplementary Files
Keywords
petrography
high-pressure metamorphism
subduction
Acatlán Complex
Piaxtla suite
Paleozoic
Mexico
How to Cite
Citas en Dimensions Service
Abstract
The Piaxtla high-pressure suite (Acatlán Complex) in southern Mexico represents a part of an ancient subduction zone. This suite consists of slices of oceanic and continental affinity containing blueschist- and eclogite-facies relics. Geological mapping of three key areas showed that rocks and mineral assemblages vary systematically and predictably across the region allowing us to divide the Piaxtla suite into two different low- and medium-temperature units (i.e., blueschist- and eclogite-facies, respectively). Field relationships suggest that rock intercalation within each unit resulted from an early subduction-related deformation stage (D1) subsequently overprinted by two deformation phases (D2 and D3). In the high-pressure–low-temperature unit, metasedimentary rocks are predominant and compositionally heterogeneous and share a common high-pressure history with the enclosed blueschists. The high-pressure–medium-temperature unit is characterized by the abundance of granitic gneisses as well as a relatively homogeneous metasedimentary package that is also co-metamorphic with the hosted eclogites. Together, field relationships and petrography indicate that low- and medium-temperature units within the Piaxtla high-pressure suite might have evolved as independent, relatively coherent tectonic slices.
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Copyright (c) 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