Holocene Lake-Level Fluctuations of Lake Aricota, Southern Peru

Placzek, Christa, Quade, Jay, and Betancourt, Julio L. (2001) Holocene Lake-Level Fluctuations of Lake Aricota, Southern Peru. Quaternary Research, 56 (2). pp. 181-190.

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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.

Item ID: 20600
Item Type: Article (Refereed Research - C1)
ISSN: 1096-0287
Date Deposited: 13 Jun 2012 01:12
FoR Codes: 04 EARTH SCIENCES > 0406 Physical Geography and Environmental Geoscience > 040605 Palaeoclimatology @ 80%
04 EARTH SCIENCES > 0402 Geochemistry > 040203 Isotope Geochemistry @ 20%
SEO Codes: 96 ENVIRONMENT > 9603 Climate and Climate Change > 960310 Global Effects of Climate Change and Variability (excl. Australia, New Zealand, Antarctica and the South Pacific) @ 100%
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