Isotopic studies of the Acatlan Complex, southern Mexico: implications for Paleozoic North American tectonics

P. Yanez, Joaquin Ruiz, P. J. Patchett, F. Ortega-Gutierrez, George E Gehrels

Research output: Contribution to journalArticle

128 Citations (Scopus)

Abstract

The Paleozoic Acatlan Complex and Grenville-age Oaxaca terrane of southern Mexico have been suggested to be the southern continuation of North American orogenic systems. The Paleozoic Acatlan Complex consists of multiply deformed metasedimentary rocks, schists, granitoids, and eclogites and have been compared to rocks of the Appalachian belt. The northward extension of both the Oaxaca terrane and Acatlan Complex, however, are obscurred by younger rock cover as they enter central Mexico. Isotopic studies show that the Acatlan Complex records three tectonothermal events. Neodymium model ages of the Acatlan Complex are unlike those of some accreted crustal blocks of the Pacific margin, which have little signs of crustal recyling. It is suggested that the Devonian metamorphic event that affected these two areas was the result of a Laurentia-Gondwana collision. A later collision in late Carboniferous time caused deformation in the Acatlan Complex, plutonic activity in southern Mexico, and deformation in the Ouachita, Marathon, and Appalachian belts. Both the Acatlan and Oaxaca terranes would have been continuous with South America until the break-up of Pangea in the Mesozoic era. -from Authors

Original languageEnglish (US)
Pages (from-to)817-828
Number of pages12
JournalBulletin of the Geological Society of America
Volume103
Issue number6
DOIs
StatePublished - 1991
Externally publishedYes

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terrane
Paleozoic
tectonics
collision
neodymium
Pangaea
Laurentia
metasedimentary rock
Gondwana
rock
schist
South America
young

ASJC Scopus subject areas

  • Environmental Science(all)
  • Earth and Planetary Sciences(all)

Cite this

Isotopic studies of the Acatlan Complex, southern Mexico : implications for Paleozoic North American tectonics. / Yanez, P.; Ruiz, Joaquin; Patchett, P. J.; Ortega-Gutierrez, F.; Gehrels, George E.

In: Bulletin of the Geological Society of America, Vol. 103, No. 6, 1991, p. 817-828.

Research output: Contribution to journalArticle

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