Petrogenesis and thermobarometry of the similar to 50 Ma rapakivi granite-syenite Acapulco intrusive: Implications for post-Laramide magmatism in southern Mexico
Por:
Hernandez-Pineda, GA, Solari, LA, Gomez-Tuena, A, Mendez-Cardenas, DL, Perez-Arvizu, O
Publicada:
1 dic 2011
Resumen:
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. Geochemically, the Acapulco intrusion varies from metaluminous to peraluminous, and displays the distinctive signatures of arc-related magmas. The studied rocks show strong negative Sr, Ba, and Eu anomalies, coupled with inc
Filiaciones:
Hernandez-Pineda, GA:
Univ Nacl Autonoma Mexico, Inst Geol, Mexico City 04510, DF, Mexico
Solari, LA:
Univ Nacl Autonoma Mexico, Ctr Geociencias, Queretaro 76001, Qro, Mexico
Gomez-Tuena, A:
Univ Nacl Autonoma Mexico, Ctr Geociencias, Queretaro 76001, Qro, Mexico
Mendez-Cardenas, DL:
Univ Nacl Autonoma Mexico, Inst Geofis, Mexico City 04510, DF, Mexico
Perez-Arvizu, O:
Univ Nacl Autonoma Mexico, Ctr Geociencias, Queretaro 76001, Qro, Mexico
|