GEOCRONOLOGÍA U/Pb DE CIRCONES DEL COMPLEJO VOLCÁNICO PAIRIQUE: INTERPRETACIONES PETROGÉNETICAS Y ERUPTIVAS

AXEL SCHMITT; YÉSICA PERALTA; CYNTHIA JOFRÉ; GUADALUPE MARO; PABLO J. CAFFE; ROBERT TRUMBULL; CARISA SARCHI

Córdoba

Congreso; XIII Congreso de Mineralogía, Petrología Ígnea y Metamórfica, y Metalogénesis.; 2019

Universidad Nacional de Córdoba

Pairique Volcanic Complex U/Pb zircon geochronology: petrogenetic and eruptive interpretations. We present a reconnaissance study of U/Pb isotopic data on zircon crystals from the Pairique Volcanic Complex (PVC). Comparisons between zircon ages (averaging ~11 Ma) and previous Ar/Ar data (biotite) suggest that the magmatic system at PVC started to develop 70-800 ka before eruption. Some of the pervasively altered units at the eastern Bajo Pairique region yielded the youngest ages of PVC, which along with petrographic data and presence of skarn suggest that part of the Bajo Pairique Lavas is actually an intrusion. Abundance (~20 %) of xenocrystic zircon cores with Pampean-Famatinian ages and the overall peraluminous nature of PVC are interpreted as evidence for an origin via increasing contamination of typical APVC magmas with metasedimentary material/anatectic melts.