Geología de los volcanes Arroyo Hondo

RISSO, CORINA; MORALES VOLOSÍN, SOLEDAD

Congreso; XX Congreso Geológico Argentino; 2017

The volcanic centers in the vicinity of the Hondo creek are two hidromagmatic edifices aligned along the Diamante Fault Zone, 15 km to the NW of the Agua del Toro dam, in the central west of Mendoza province. The volcanism is related to the northernmost part of the Payenia Volcanic Province known as the Diamante Volcanic Field. The Cerro Arroyo Hondo (2154 m a.s.l.), which has been dated at434 ± 27 ka, is a tuff cone with a superposed younger scoria cone. Along a gully on its southern face, a 95 meters profile was surveyed in which wet and dry fall deposits are intercalated with deposits of dry basal pyroclastic surges. The final activity, was the formation of a scoria cone and one aa lava flow with two lobes that have an average thickness of 10 m. On the other hand, about 3 km to the NW of Cerro Arroyo Hondo is the Arroyo Hondo maar, dated at 449 ± 28 ka. In this case, deposits of its activity could not be found. Only the morphology, represented by a slightly elliptical edifice with a maximum diameter of 600 m and its crater?s floor about 15 meters below the surface was recognized.