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- Title
Lake-Level Chronology on the Southern Bolivian Altiplano (18°–23°S) during Late-Glacial Time and the Early Holocene.
- Authors
Sylvestre, Florence; Servant, Michel; Servant-Vildary, Simone; Causse, Christiane; Fournier, Marc; Ybert, Jean-Pierre
- Abstract
Stratigraphic analyses of outcrops, shorelines, and diatoms from the southern Bolivian Altiplano (Uyuni-Coipasa basin) reveal two major lacustrine phases during the late-glacial period and the early Holocene, based on a chronology established by radiocarbon and U/Th control. A comparison of 14 C and 230 Th/ 234 U ages shows that during times of high lake level, radiocarbon ages are valid. However, during low-water periods, 14 C ages must be corrected for a reservoir effect. The lacustrine Tauca phase started a little before 16,000 14 C yr B.P., and the lake level reached its maximum between 13,000 and 12,000 14 C yr B.P. A dry event (Ticaña) occurred after ca. 12,000 and before 9500 14 C yr B.P. A moderate lacustrine oscillation (Coipasa event) occurred between ca. 9500 and 8500 14 C yr B.P., using a reservoir-corrected conventional 14 C chronology. Comparisons between the lake-level chronology in the Uyuni-Coipasa basin and data from other southern tropical areas of South America suggest that the lacustrine evolution may reflect large-scale climatic changes.
- Publication
Quaternary Research, 1999, Vol 51, Issue 1, p54
- ISSN
0033-5894
- Publication type
Article
- DOI
10.1006/qres.1998.2017