IBIGEO 22622
INSTITUTO DE BIO Y GEOCIENCIAS DEL NOA
Unidad Ejecutora - UE
artículos
Título:
Recording of multiple lake-marsh paleoenvironments during the middle Holocene in the Quebrada del Toro, NW Argentina
Autor/es:
SANCHEZ, M.C.; DE FRANCESCO, CLAUDIO G.; MARTINEZ, O. G.; VEIZAGA SAAVEDRA, J.; PINGEL, HEIKO
Revista:
Revista de la Asociación Geológica Argentina
Editorial:
Asociación Geológica Argentina
Referencias:
Año: 2021
ISSN:
1853-7138
Resumen:
Quaternary lake systems have developed in many Andean intermontane valleys in northwestern 20 Argentina in association with landslides, rock avalanches, and the development of large alluvial fans, 21 caused either by tectonics, climate change, and/or increased rainfall. At the El Candado location, in the 22 narrow, southern sector of the Quebrada del Toro (Salta Province, Argentina), fine-grained sedimentary 23 deposits are recognized, which, based on their sedimentological and paleontological characteristics, are 24 interpreted as the sedimentary infill of shallow lakes-marshes that were generated by the development 25 of large alluvial fans that dammed the Río Toro. Based on AMS 14 C dating of gastropod shells and 26 organic matter (ca. 8-4.8 ka), this region experienced multiple lacustrine-marsh paleoenvironments 27 during the middle Holocene. Pollen analysis and paleobotanical investigations of these deposits suggest 28 that the accumulation of the lake sediments occurred under relatively humid conditions that alternated 29 with semi-arid periods as is typical for the Andean Holocene.
