Orbicular granite sills in the Mazatán core complex, Sonora, Mexico

  • Olivier Monod Laboratoire de Géologie Structurale, Université d'Orléans, 41002 Orlèans, France.
  • Efrén Pérez-Segura Departamento de Geología, Universidad de Sonora, 83000 Hermosillo, Sonora, México.
  • Didier Richard Laboratoire de Géologie Historique et Structurale, Bat 504, Université de Paris Sud, 91405 Orsay, France.
  • Thierry Calmus Departamento de Geología, Universidad de Sonora, 83000 Hermosillo, Sonora, México.
Keywords: Orbicular granite, orbicular texture, metamorphic core complex, Sonora, Mexico.

Abstract

Orbicular granites are unusual rocks, and the presence of a large outcrop within the Mazatán metamor­phic core complex, Sonora, Mexico, was unexpected. This is the second orbicular rock outcrop recognized in Mexico, after the San Pedro Mártir gabbro in Baja California. Sierra Mazatán is the southernmost metamorphic core complex in the northern Cordillera, which resulted of Mesozoic crustal thickening, followed by Tertiary extensional tectonics… in order to continue, download the full paper in PDF.

 

Published
2019-01-27
Issue
Vol 12 No 1 (1995)
Section
Regular Papers

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