EL CICLO ÁNDICO DE GROEBER EN LA CUENCA NEUQUINA, UNA REVISIÓN Y ACTUALIZACIÓN

AGUIRRE URRETA, MARIA BEATRIZ; CARAMES, ANDREA; CATALDO, CECILIA; CONCHEYRO, ANDREA; HERRERA, YANINA; LAZO, DARIO; LESCANO, MARINA; TUNIK, MAISA ANDREA

Mendoza

Congreso; 11º Congreso de Exploración y Desarrollo de Hidrocarburos - Estratigrafía y Análisis de Cuencas; 2022

Instituto Argentino del Petróleo y Gas

A state of the knowledge of the Andean cycle is presented, mainly based on our recent works, butalso on highlights of recent research of many colleagues. This synthesis allowed us to update thegeochronology of its different units. New absolute ages through U-Pb analysis in zircons by differentmethods complement those previously carried out and made possible to accurately limit the age of these units. We have been able to define the boundary between the Tordillo and Vaca MuertaFormations very precisely between 147 and 146 Ma; the age of the Agrio Formation between 132 and 126 Ma, and to present the first absolute ages of the Huitrín Formation. All these data are screenedthrough precise biostratigraphy, sequence stratigraphy and astrochronology. The Troncoso Memberof the Huitrín Formation yielded an age of 123 Ma that placed it in the Barremian. This is partiallycorroborated by the finding of fossils in the La Tosca Member with trigonioids and foraminifera ofundoubted marine origin, dated with nannofossils of early Barremian age indicating the permanence ofcommunication with the Pacific during the deposition of the Huitrín Formation.