TY - JOUR
T1 - Palaeozoic structures in the Xayacatlan area, Acatlan Complex, southern Mexico
T2 - Transtensional rift- and subduction-related deformation along the margin of Oaxaquia
AU - Morales-Gamez, Miguel
AU - Duncan Keppie, J.
AU - Lee, James K W
AU - Ortega-Rivera, Amabel
PY - 2009/4
Y1 - 2009/4
N2 - 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.
AB - 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.
KW - Acatlan Complex
KW - Geochronology
KW - Mexico
KW - Oaxaquia
KW - Structure
UR - http://www.scopus.com/inward/record.url?scp=75449084741&partnerID=8YFLogxK
U2 - 10.1080/00206810802688659
DO - 10.1080/00206810802688659
M3 - Article
AN - SCOPUS:75449084741
SN - 0020-6814
VL - 51
SP - 279
EP - 303
JO - International Geology Review
JF - International Geology Review
IS - 4
ER -