abstract

• The Pinos Volcanic Complex (PVC) is located in the San Luis Potosi Volcanic Field (SLPV) and southern region of the Mesa Central that includes Oligocene rhyolites and trachydacites. These felsic volcanic rocks are characterized by porphyritic textures with a main mineralogical arrangement of phenocrystals of quartz, potassium feldspar (sanidine), plagioclase and biotite embedded in a vitreous matrix with microcrystals of quartz. They display peraluminous, high-silica, alkaline (not peralkaline) composition, with flat heavy rare earth element concentrations and negative Eu anomalies values. They are enriched in large-ion lithophile elements (LILEs; Rb, Ba, K, Th, Ce) relative to highfield-strength elements (HFSE; Nb, Zr, P, Ti). Trace element ratios trend highlights variable degree of partial melting rather than the role of fractional crystallization. The petrogenetic modelling of trace elements reveal that the felsic volcanic rocks are consistent with their formation via partial melting of the middle/upper continental crust. Multi-dimensional tectonic discriminant diagrams and magmatic model indicate an extensional tectonic environment for the genesis of the felsic volcanic rocks. © 2020 Elsevier Ltd

authors

• Acosta Fimbres K.G.
• López-Loera H.
• Torres Hernández José Ramón
• Torres Sánchez Sonia Alejandra
• Torres-Sánchez D.
• Verma S.K.

publication date

• 2020-01-01

funding provided via

• 336677, 932894  Grant
• NA160116  Grant

published in

• Journal of South American Earth Sciences  Journal

keywords

• Felsic volcanism; Geochemistry; Mesa central; Mexico; Petrogenesis; Tectonic setting felsic rock; fractional crystallization; geochemistry; Oligocene; partial melting; petrogenesis; rhyolite; tectonic evolution; tectonic setting; volcanic rock; Mesa Central; Mexico [North America]

Digital Object Identifier (DOI)

• 10.1016/j.jsames.2020.102704

start page

end page

volume

• 102