Provenance of Carboniferous-Permian sedimentary units in southern Mexico: evidence for peri-arc basin evolution during the Pangea assembly
Por:
Guerrero-Moreno, Sandra, Solari, Luigi A. A., Ortega-Flores, Berlaine, Maldonado, Roberto, Ortega-Obregon, Carlos
Publicada:
1 ene 2023
Ahead of Print:
1 feb 2023
Categoría:
Geology
Resumen:
The Oaxacan Complex Carboniferous-Permian sedimentary cover in southern
Mexico records provenance shifts through time, reflecting the collision
between Gondwana and Laurentia to amalgamate Pangea. The integration of
petrological analysis and LA-ICP-MS U-Pb zircon geochronology from
Santiago, Ixtaltepec and Yododene formations compared with adjacent
terranes suggests that: (1) during the Early Mississippian, the Santiago
Formation received sediments mainly from local sources such as the
Oaxacan Complex and Tinu Formation, with minor contributions from
adjacent peri-Gondwana sources. The magmatic activity may have started
during this time (similar to 359-346 Ma) (2) during the Late
Mississippian (Ixtaltepec Formation), detrital zircon grains of
Ediacaran-Cambrian age are dominant, derived from sediments either
related to the Pan-African/Brasiliano orogeny or the opening of the
Iapetus Ocean; (3) during the Late Mississippian-Middle Pennsylvanian,
intercalated marine volcaniclastic sandstone (Ixtaltepec Formation)
provides the first record of Carboniferous arc-related volcanism
reported in southern Mexico, dated between 330 and 308 Ma; (4) the early
Permian Yododene Formation records the exhumation and erosion of the
sedimentary cover during the final stage of Pangea assembly. Rhyodacitic
subvolcanic sills and lavas dated at similar to 282-270 Ma are present
throughout the succession. Volcanism and ca. 360-308 Ma detrital zircon
grains could be associated with a Carboniferous magmatic arc formed by
subduction of the Rheic oceanic plate beneath Gondwana. Slightly younger
detrital zircon and subvolcanic rocks dated at similar to 300-270 Ma are
linked to a western Pangea arc developed in response to the subduction
of the Paleo-Pacific Ocean following Pangea assembly. Our results
suggest that the Carboniferous-Permian units were deposited in a
peri-arc basin, sharing sediment provenance with the Maya and Coahuila
blocks, the Sierra de Juarez Complex, and northwestern South America.
Filiaciones:
Guerrero-Moreno, Sandra:
Univ Nacl Autonoma Mexico, Ctr Geociencias, Posgrad Ciencias Tierra, Juriquilla, Mexico
Univ Nacl Autonoma Mexico, Ctr Geociencias, Posgrad Ciencias Tierra, Campus Juriquilla, Juriquilla 76230, Mexico
Solari, Luigi A. A.:
Univ Nacl Autonoma Mexico, Ctr Geociencias, Juriquilla, Mexico
Ortega-Flores, Berlaine:
Univ Nacl Autonoma Mexico, Ctr Geociencias, Juriquilla, Mexico
Maldonado, Roberto:
Univ Nacl Autonoma Mexico, Inst Geol, Mexico City, Mexico
Ortega-Obregon, Carlos:
Univ Nacl Autonoma Mexico, Ctr Geociencias, Juriquilla, Mexico
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