The Cuicateco terrane: Upper Cretaceous oceanic basin with subduction influence in southern Mexico? New structural, geochemical and geochronological data
Por:
Perez-Gutierrez, R, Solari, LA, Gomez-Tuena, A, Valencia, VA
Publicada:
1 abr 2009
Categoría:
Geology
Resumen:
The southestern portion of the Cuicateco terrane, between Matias Romero and Juchiton, Oaxaca, is made up by a low metamorphic grade vulcanosedimentary sequence that shows at least three deformation events, D(1): isoclinal-recumbent F(1) folding of the S(0) surfaces with northeastern verging and development of a S(1) axial plane cleavage with southwestern dipping. Parallel to S(1) surfaces can be observed the development of hornblende, epidote, chlorite, muscovite and quartz. Such structures are related to a post-Maastrichtian left transcurrent deformational event. D(2): Paleocene(?) event characterized by thrust faulting with displacement direction to north-northeast, such as the Vista Hermosa mesostructure fault, and the development of the S(2) cleavage without associated recrystallization. D(3): Miocenic event, defined by normal and lateral faulting. Chemical composition of the amphibolitic rocks of the Cuicateco terrane resembles that of tholeiitic basalts (SiO(2) 45-50%), with a de
Filiaciones:
Perez-Gutierrez, R:
Univ Nacl Autonoma Mexico, Posgrado Ciencias Tierra, Inst Geol, Mexico City 04510, DF, Mexico
Solari, LA:
Univ Nacl Autonoma Mexico, Ctr Geociencias, Queretaro 76230, Qro, Mexico
Gomez-Tuena, A:
Univ Nacl Autonoma Mexico, Ctr Geociencias, Queretaro 76230, Qro, Mexico
Valencia, VA:
Univ Arizona, Dept Geosci, Tucson, AZ 85721 USA
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