Portal de Periódicos da CAPES

Petrogenesis and thermobarometry of the ∼50 Ma rapakivi granite-syenite Acapulco intrusive: Implications for post-Laramide magmatism in southern Mexico

2011; Geological Society of America; Volume: 7; Issue: 6 Linguagem: Inglês

10.1130/ges00744.1

1553-040X

Guillermo A. Hernández-Pineda, Luigi Solari, Arturo Gómez‐Tuena, Doris L. Méndez-Cárdenas, Ofelia Pérez‐Arvizu,

High-pressure geophysics and materials

The Acapulco intrusion is a composite pluton that belongs to the coastal batholithic belt of southern Mexico, intruding the Xolapa metamorphic complex and cropping out in the neighboring area of Acapulco city. The Acapulco intrusion has been considered as an anomaly based on its age, which contrasts with the surrounding plutons and the general age trend from the coastal batholithic belt and corresponds to an Eocene–Oligocene age. It ranges in composition from granite (sensu stricto) to syenite and diorite. The most distinctive characteristic of the Acapulco intrusion is the rapakivi texture developed in the granites, which are characterized by biotite, amphibole, allanite, and fluorite as distinctive minerals, plus titanite, zircon, and apatite as accessory phases.