Late Pleistocene Pluvial Phase in Patagonia

TATUR, ADRZEJ; DEL VALLE, RODOLFO; BIANCHI, MARIA M.; OUTES, VALERIA; VILLAROSA, GUSTAVO

Geolines

Academy of Sciences of the Czech republic

Lugar: Praga; Año: 2000 vol. 11 p. 47 - 51

1210–9606

A large and deep lake occupied Maquinchao basin (41°S), probably between 13,200years BP and 11,800 years BP during the great regional deglaciation, and was followed by shallow shallow phase still lasting to about 11,000 years BP. Afterwards recessive shoreline truncated formerly accumulated deposits during drying of the lake to more or less recent size about 8,000 years BP. Presented chronology of events is based on TL dating, the comparison with record from sediments of  Laguna Cari Laufquen Chica and position of two dacite tephra horizons considered here as a regional stratigraphic markers (pre-dating and pos-dating) bracketing the pluvial phase. Tephra markers were identified and dated in andean Laguna El Trebol. Radiocarbon dating of sedimentary carbonates from paleolake suggests scenario about 4,000 years old.