INVESTIGADORES
LOPEZ Monica Graciela
congresos y reuniones científicas
Título:
COMPLEJO LOS MENUCOS: UN EVENTO VOLCÁNICO PERMO-TRIÁSICO EN EL NORTE DE PATAGONIA
Autor/es:
LUPPO, T.; LÓPEZ DE LUCHI, M. G.,; RAPALINI, A.E.; MARTINEZ DOPICO, C.I.
Lugar:
San Miguel de Tucuman
Reunión:
Congreso; 20 Congreso Geológico Argentino; 2017
Institución organizadora:
Univ de Tucuman-Asoc. Geol. Arg
Resumen:
Abstract.Three new U?Pb SHRIMP ages on zircon are presented for volcanic units of Los Menucos Complex, located in extra andean northern Patagonia.Anaround 6 km thick composite geologic section, made up by rhyolitic and dacitic ignimbrites, mesosilisic lavas and subordinated volcaniclastic-epiclastic deposits is presented. The obtained ages are:256.8 ± 1.7 Mafor arhyolitic ignimbrite, 252.4 ± 1.8 Ma for an andesite and 248.3 ± 1.6 Ma for a dacitic ignimbrite. These crystallization ages thatcorrespond respectivelyto the basal, middle and upper portions of the section,constrain the main activity of the Complex to a 10Ma period across the Permian-Triassic boundary. The La Esperanza Magmatic Province is proposed as a new major unit that encompass Los Menucos Complex and La EsperanzaPlutono-Volcanic Complex, because the complexes are coeval, nearby and no crustal discontinuity is recognized
