Altered volcanic ash layers of the Late Cretaceous San Felipe Formation, Sierra Madre Oriental (Northeastern Mexico): U-Pb geochronology, provenance and tectonic setting

Velasco Tapia, Fernando y Martínez Paco, Margarita y Iriondo, Alexander y Ocampo Díaz, Yam Zul Ernesto y Cruz Gámez, Esther María y Ramos Ledezma, Andrés y Andaverde Arredondo, Jorge Alberto y Ostroumov, Mikhail y Masuch Oesterreich, Dirk (2016) Altered volcanic ash layers of the Late Cretaceous San Felipe Formation, Sierra Madre Oriental (Northeastern Mexico): U-Pb geochronology, provenance and tectonic setting. Journal of South American Earth Sciences, 70 (1). pp. 18-35. ISSN 0895-9811

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Resumen

A detailed petrographic, geochemical, and UePb geochronological study of altered volcanic ash layers, collected in eight outcrops of the Late Cretaceous San Felipe Formation (Sierra Madre Oriental, North- eastern Mexico), has been carried out. The main objectives have been: (1) to establish a deposit period, and (2) to propose a reliable provenance-transport-deposit-diagenetic model. These volcano- sedimentary strata represent the altered remains of vitreous-crystalline ash (main grains: quartz + K- feldspar (sanidine) + Na-plagioclase + zircon + biotite; groundmass: glass + calcite + clinochlore + illite) deposited and preserved in a shallow, relatively large in area, open platform environment. Major and trace element geochemistry indicate that parent volcanism was mainly rhyodacitic to rhyolitic in composition. Discrimination diagrams suggest a link to continental arc transitional to extension tectonic setting. UePb geochronology in zircon has revealed that the volcanic ash was released from their sources approximately during the range 84.6 ± 0.8 to 73.7 ± 0.3 Ma, being transported to the depocenters. Burial diagenesis process was marked by: (a) a limited recycling, (b) the partial loss of original components (mainly K-feldspar, plagioclase, biotite and glass), and (c) the addition of quartz, calcite, illite and cli- nochlore. The location of the source area remains uncertain, although the lack of enrichment in Zr/Sc ratio suggests that ashes were subjected to relatively fast and short-distance transport process. El Peñuelo intrusive complex, at 130-170 km west of the depocenters, is the nearest known zone of active magmatism during the Upper Cretaceous. This intermediate to felsic pluton, characterized by a geochemical affinity to post-orogenic tectonic setting, could be linked to the volcanic sources.

Tipo de elemento:	Article
Palabras claves no controlados:	Altered ash-beds; Immobile element geochemistry; Santonian-Campanian; Cretaceous Western Interior Sea
Materias:	Q Ciencia > QE Geología
Divisiones:	Ciencias de la Tierra
Usuario depositante:	Dr Fernando Velasco-Tapia
Creadores:	Creador Email ORCID Velasco Tapia, Fernando fernando.velascotp@uanl.edu.mx NO ESPECIFICADO Martínez Paco, Margarita NO ESPECIFICADO NO ESPECIFICADO Iriondo, Alexander NO ESPECIFICADO NO ESPECIFICADO Ocampo Díaz, Yam Zul Ernesto NO ESPECIFICADO NO ESPECIFICADO Cruz Gámez, Esther María NO ESPECIFICADO NO ESPECIFICADO Ramos Ledezma, Andrés NO ESPECIFICADO NO ESPECIFICADO Andaverde Arredondo, Jorge Alberto NO ESPECIFICADO NO ESPECIFICADO Ostroumov, Mikhail NO ESPECIFICADO NO ESPECIFICADO Masuch Oesterreich, Dirk NO ESPECIFICADO NO ESPECIFICADO
Fecha del depósito:	19 Ene 2017 21:27
Última modificación:	19 Ene 2017 21:27
URI:	http://eprints.uanl.mx/id/eprint/11909

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