INFERENCIAS PALEOCLIMÁTICAS PARA EL MIOCENO TARDÍO DE LA CUENCA ANGASTACO BASADAS EN EL ANÁLISIS FISIONÓMICO FOLIAR: FORMACIÓN PALO PINTADO, SALTA, ARGENTINA

ROBLEDO, JUAN MANUEL; HORN MARICEL Y.; GALLI, C. I.; ANZÓTEGUI, LUISA M.

ANDEAN GEOLOGY

SERVICIO NACIONAL GEOLOGIA MINERVA

Lugar: Santiago de Chile; Año: 2019

0718-7092

The Palo Pintado Formation of the late Miocene from Salta province, presents a great paleoclimatic interest due to the environmental conditions prevailing during this geochronologic interval. The geological and paleobotanical data suggest that in the Palo Pintado Formation (Angastaco Basin), wetter conditions would have existed comparing with other nearby and contemporary Formations, for example the Playa del Zorro Aloformation (late Miocene of Catamarca) and the Chiquimil (late Miocene of Tucumán), Salicas and the Toro Negro Formations (both from the late Miocene of La Rioja). In this study, the margin and the foliar area are analyzed, in order to obtain the annual average temperature (TMA) and the average annual precipitation (PMA). The resulting values were: TMA = 23.98 ° C and PMA = 330.8 mm These results are conditioned by the interpretation of different authors, who consider that the Palo Pintado Formation would have been deposited under a relatively humid climate, possibly as a consequence of the rains in the region.