Mesozoic exhumation history of the Grenvillian Oaxacan Complex, southern Mexico

We present the first fission‐track results from the Grenvillian Oaxacan Complex, southern Mexico. Time–temperature modelling of the data indicates that two significant Mesozoic cooling episodes are recorded in the Oaxacan Complex and these are interpreted as resulting from exhumation. The older cool...

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Bibliographic Details
Published in:Terra nova (Oxford, England) England), 2021-02, Vol.33 (1), p.86-94
Main Authors: Abdullin, Fanis, Solari, Luigi, Solé, Jesús, Ortega‐Obregón, Carlos
Format: Article
Language:English
Subjects:
Cooling
Cretaceous
Exhumation
Fault zones
fission‐track thermochronology
Jurassic
Mesozoic
Oaxacan Complex
Pangea break‐up
Rifting
Triassic
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Summary:We present the first fission‐track results from the Grenvillian Oaxacan Complex, southern Mexico. Time–temperature modelling of the data indicates that two significant Mesozoic cooling episodes are recorded in the Oaxacan Complex and these are interpreted as resulting from exhumation. The older cooling event took place from the Late Triassic to Middle Jurassic and is possible linked to the break‐up of Pangea (including the initial opening of the Gulf of Mexico during the Jurassic). The younger exhumation period in the Early Cretaceous is contemporaneous with the final stages of rifting of the Gulf of Mexico. Key stratigraphic records also provide independent evidence for these exhumation episodes. In our view, both Mesozoic rapid exhumation events were controlled by the activity of the Caltepec Fault Zone and the Oaxaca Fault. Our data suggest that both these large fault systems have remained active since, at least, the Late Triassic.
ISSN:0954-4879
1365-3121
DOI:10.1111/ter.12493