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Holocene Lake-Level Fluctuations of Lake Aricota, Southern Peru

Published online by Cambridge University Press:  20 January 2017

Christa Placzek
Affiliation:
Department of Geosciences and Desert Laboratory, University of Arizona, Tucson, Arizona, 85721, E-mail: [email protected]
Jay Quade
Affiliation:
Department of Geosciences and Desert Laboratory, University of Arizona, Tucson, Arizona, 85721, E-mail: [email protected]
Julio L. Betancourt
Affiliation:
U.S. Geological Survey, Desert Laboratory, 1675 West Anklam Road, Tucson, Arizona, 85745

Abstract

Lacustrine deposits exposed around Lake Aricota, Peru (17° 22′S), a 7.5-km2 lake dammed by debris flows, provide a middle to late Holocene record of lake-level fluctuations. Chronological context for shoreline deposits was obtained from radiocarbon dating of vascular plant remains and other datable material with minimal 14C reservoir effects (<350 yr). Diatomites associated with highstands several meters above the modern lake level indicate wet episodes. Maximum Holocene lake level was attained before 6100 14C yr B.P. and ended ∼2700 14C yr B.P. Moderately high lake levels occurred at 1700 and 1300 14C yr B.P. The highstand at Lake Aricota during the middle Holocene is coeval with a major lowstand at Lake Titicaca (16°S), which is only 130 km to the northeast and shares a similar climatology. Comparisons with other marine and terrestrial records highlight emerging contradictions over the nature of mid-Holocene climate in the central Andes.

Type
Research Article
Copyright
University of Washington

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