期刊
INTERNATIONAL GEOLOGY REVIEW
卷 51, 期 4, 页码 279-303出版社
TAYLOR & FRANCIS INC
DOI: 10.1080/00206810802688659
关键词
Mexico; structure; geochronology; Acatlan Complex; Oaxaquia
类别
资金
- Papiit [IN100108-3]
- CONACyT [CB-2005-1: 24894]
The Xayacatlan 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.
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