Palaeozoic structures in the Xayacatlán area, Acatlán Complex, southern Mexico: transtensional rift- and subduction-related deformation along the margin of Oaxaquia

The Xayacatlán area (eastern Mixteca terrane, southern Mexico) was previously inferred to preserve the Ordovician-Silurian thrust contact between vestiges of the Iapetus Ocean and the para-autochthon bordering Oaxaquia. Detailed remapping indicates that the rocks occur in four vertically-bounded, NS...

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Bibliographic Details
Published in:International geology review 2009-04, Vol.51 (4), p.279-303
Main Authors: Morales-Gamez, Miguel, Duncan Keppie, J., Lee, James K. W., Ortega-Rivera, Amabel
Format: Article
Language:English
Subjects:
Acatlán Complex
geochronology
Mexico
Oaxaquia
structure
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Summary:The Xayacatlán area (eastern Mixteca terrane, southern Mexico) was previously inferred to preserve the Ordovician-Silurian thrust contact between vestiges of the Iapetus Ocean and the para-autochthon bordering Oaxaquia. Detailed remapping indicates that the rocks occur in four vertically-bounded, NS fault blocks. The latter record the following tectonothermal events that post-date Iapetus and occurred along the margins of the Rheic (1) and Pacific (2 and 3) oceans: (1) dextral transtension accompanying intrusion of an NS, tholeiitic dike swarm at ∼442 Ma; (2) penetrative, greenschist-facies deformation during the Mississippian related to extrusion of high-pressure rocks; and (3) subgreenschist-facies dextral transtension on NS faults during the generation of Middle Permian fabrics.
ISSN:0020-6814
1938-2839
DOI:10.1080/00206810802688659