Thermochronology and exhumation rates of granitic intrusions at Mesa Central,Mexico期刊界 All Journals 搜尽天下杂志传播学术成果专业期刊搜索期刊信息化学术搜索

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Thermochronology and exhumation rates of granitic intrusions at Mesa Central,Mexico

Authors:	Angel F Nieto-Samaniego María de Jesús Paulina Olmos-Moya Gilles Levresse Susana A Alaniz-Alvarez Fanis Abdullin Alexis del Pilar-Martínez

Institution:	1. Centro de Geociencias, Universidad Nacional Autónoma de México, Campus Juriquilla, Juriquilla, Querétaro, Méxicoafns@geociencias.unam.mx;3. Centro de Geociencias, Universidad Nacional Autónoma de México, Campus Juriquilla, Juriquilla, Querétaro, México;4. Universidad Nacional Autónoma de México, Posgrado en Ciencias de la Tierra, Juriquilla, Querétaro, México;5. Centro de Geociencias, CONACyT – Universidad Nacional Autónoma de México, Campus Juriquilla, Juriquilla, Querétaro, México;6. Universidad Nacional Autónoma de México, Posgrado en Ciencias de la Tierra, Juriquilla, Querétaro, Méxicohttps://orcid.org/0000-0002-3257-4928

Abstract:	ABSTRACT The Mesa Central of Mexico (MC) is an elevated plateau located 2000 m above sea level in central Mexico, where intrusions outcrop that register the history of exhumation-erosion occurring during the Late Cretaceous-Paleogene. The tectonic history of the region records formation of the Late Cretaceous-Paleogene ‘Mexican orogen’; this was followed by extension of the entire region and several plutons were then exhumed. The age and magnitude of the crustal uplift and erosion occurring during exhumation has not been addressed to date. Therefore, this study reports the crystallization and cooling ages of two plutons, the Tesorera Granodiorite and the Comanja Granite, and estimates their emplacement depths. Based on these data, the exhumation age of the Tesorera Granodiorite is estimated to be between ~73 Ma and ~63 Ma at an exhumation rate of ~528 m/m. y. and that of the Comanja Granite is 52 Ma and 48 Ma at an exhumation rate of ~2500 m/m. y. Exhumation-erosion event of the Tesorera Granodiorite was located on the trace of the San Luis-Tepehuanes Fault System and that of the Comanja Granite on the a trace of the El Bajío Fault System. Furthermore, the high exhumation rate in the Comanja Granite suggests that gravitational collapse played an important role during exhumation.

Keywords:	Mesa Central of Mexico gravitational collapse exhumation rate intrusion exhumation thermochronology

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