Petrographic and geochemical characteristics of upper Aptian calc-alkaline volcanism in San Miguel de Allende, Guanajuato state, Mexico

Luis Enrique Ortiz-Hernández Centro de Investigaciones en Ciencias de la Tierra, Universidad Autónoma del Estado de Hidalgo, Carretera Pachuca -Tulancingo Km. 4.5, 42184, Pachuca, Hgo., México. Instituto Politécnico Nacional, Sección de Estudios de Posgrado e Investigación, ESIA-Unidad Ticomán, Avenida Ticomán 600, Col. San José Ticomán. Del. Gustavo A. Madero, 07340 México, D.F.
Kinardo Flores-Castro Centro de Investigaciones en Ciencias de la Tierra, Universidad Autónoma del Estado de Hidalgo, Carretera Pachuca -Tulancingo Km. 4.5, 42184, Pachuca, Hgo., México.
Otilio Arturo Acevedo-Sandoval Centro de Investigaciones en Ciencias de la Tierra, Universidad Autónoma del Estado de Hidalgo, Carretera Pachuca -Tulancingo Km. 4.5, 42184, Pachuca, Hgo., México.

Keywords: Guerrero terrane, calc-alkaline volcanism, petrography, geochemistry, Guanajuato, Mexico.

Abstract

A volcanic sequence formed by calc-alkaline basalts and basaltic andesites interbedded with pelagic limestones, black shales, radiolarites, and epiclastic rocks that are in tectonic contact with flysch-like strata, is reported in the vicinity of San Miguel de Allende, in Guanajuato state. An upper Aptian age is suggested by paleontological evidence. The sequence is interpreted as the eastern remnant of an allochthonous, lower Cretaceous volcanic stage in central Mexico.

Published

2018-06-19

Issue

Vol 19 No 2 (2002)

Section

Regular Papers

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