Petrogenetic and tectonic implications of Oligocene-Miocene volcanic rocks from the Sierra de San Miguelito complex, central Mexico
Por:
Torres-Sanchez, Dario, Verma, Sanjeet K., Verma, Surendra P., Velasco-Tapia, Fernando, Torres-Hernandez, Jose Ramon
Publicada:
1 ene 2019
Resumen:
Paleogene-Neogene volcanic complexes are commonly found in the southern part of the Mesa Central province (MC), Mexico. The Sierra de San Miguelito Complex (SSMC) is located in the southeastern part of the MC and consists of two main phases of Oligocene and Miocene units as follows: (1) basaltic group of porphyritic texture of basalt/trachybasalt compositions; and (2) rhyolite-ignimbrite group of porphyritic texture of trachydacite/trachyte compositions. Chondrite-normalized rare-earth element patterns for the basaltic group display enrichment in light rare earth elements (LREE) and large ion lithophile elements (LILE), whereas the rhyolite-ignimbrite group shows enrichment in LREE and high field strength elements (HFSE). The Eu anomalies within the SSMC become progressively more negative from the basaltic group to the rhyolite-ignimbrite group (Eu/Eu* = 1.13 to 0.02) suggest upper crust (crustal contamination) participates during magma generation. Trace element modelling reveals that the basaltic group evolved through a mixing process between mafic and felsic end-members. In contrast, chondrite-normalized and multi-element models reveal that the rhyolite-ignimbrite group evolved by partial melting of the upper continental crust. New multi-dimensional discrimination diagrams along with the Nb–Ta anomalies reveal that the SSMC volcanic rocks were generated in an extensional environment. © 2019 Elsevier Ltd
Filiaciones:
Torres-Sanchez, Dario:
Posgrado de la División de Geociencias Aplicadas, Instituto Potosino de Investigación Científica y Tecnológica (IPICYT), Camino a la Presa San José 2055, San Luis Potosí, 78216, Mexico
División de Geociencias Aplicadas, Instituto Potosino de Investigación Científica y Tecnológica (IPICYT), Camino a la Presa San José 2055, San Luis Potosí, 78216, Mexico
Inst Potosino Invest Cient & Tecnol IPICYT, Posgrad Div Geociencias Aplicadas, Camino Presa San Jose 2055, San Luis Potosi 78216, Mexico
Verma, Sanjeet K.:
División de Geociencias Aplicadas, Instituto Potosino de Investigación Científica y Tecnológica (IPICYT), Camino a la Presa San José 2055, San Luis Potosí, 78216, Mexico
Inst Potosino Invest Cient & Tecnol IPICYT, Div Geociencias Aplicadas, Camino Presa San Jose 2055, San Luis Potosi 78216, Mexico
Verma, Surendra P.:
Instituto de Energías Renovables, Universidad Nacional Autónoma de México, Temixco, Morelos 62580, Mexico
Univ Nacl Autonoma Mexico, Inst Energias Renovables, Temixco 62580, Morelos, Mexico
Velasco-Tapia, Fernando:
Universidad Autónoma de Nuevo León, Facultad de Ciencias de la Tierra, Ex-Hacienda de Guadalupe, Linares, Mexico
Univ Autonoma Nuevo Leon, Fac Ciencias Tierra, Ex Hacienda De Guadalupe, Linares, Mexico
Torres-Hernandez, Jose Ramon:
Instituto de Geología, Universidad Autónoma de San Luis Potosí, Manuel Nava No. 5. Zona Universitaria, San Luis Potosí, S.L.P., 78240, Mexico
Univ Autonoma San Luis Potosi, Inst Geol, Manuel Nava 5 Zona Univ, San Luis Potosi 78240, Slp, Mexico
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