Magmatic affinity of lavas of the atotonilco el grande formation
Abstract
It is recorded the magmatic affinity of volcanic structure-forming lavas (explosion pipes and accretion lava balls) from the upper part of the Pliocene Atotonilco El Grande formation, nearby the namesake town and the Amajac spa, central Hidalgo state (central Mexico). For the spill of the explosion pipe petrography shows a microlithic porphyry texture with halophytic matrix and trachytic for the accretional lava ball, being augite the accessory mineral. Major and trace element geochemical analysis in lava spill, point to the existence of silica contents of 47.95-60.98% corresponding to metaluminous basalt and trachyandesite (0.69≤A/CNK≤0.89), with enriched LREE spectra (5.91≤(La/Yb) N ≤ 7.82) and certain affinity with oceanic island basalts. These lavas are correlated with the Pliocene evolution of the eastern sector of the Trans Mexican Volcanic Belt, poured in a continental environment (paleo lake).
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