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Publication Type
Conference Proceedings
Author, Analytic
Burn, Michael; Whitney, B.S,; Fitzpatrick, K.; Metcalfe, S. E.; Loader, N. J.; Surangi, W.; Punyasena, W.; Mayle, F. E.
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Paper/Section Title
The Pleistocene-Holocene transition in continental South America: summary of multiproxy data from Laguna La Gaiba
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Proceedings Title
Calibrating Environmental Leads and Lags over the Last 50 kyr CELL-50K Workshop,
Date of Meeting
November 12-15, 2012
Place of Meeting
Budapest, Hungary
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Abstract
Published and ongoing analyses from a sediment core extracted from a large lake in the Pantanal, the headwaters of the Paraguay River, continental South America, elucidate patterns of precipitation and temperature change, as well as biogeographic perspectives, from ca. 45,000 yrs BP until present. This multiproxy dataset includes completed analyses of pollen, diatoms, XRF core scanner data, charcoal, carbon isotopes, Pediastrum, and ongoing work includes hydrogenisotope analyses of leaf waxes and Sporomiella spores. Environmental changes inferred from these data are constrained with an age-model based on 18 radiocarbon dates, 16 of which were derived using well-preserved terrestrial macrofossils. Initial investigations using fossil pollen data demonstrate that deglacial warming occurred at 19,500 yrs BP, rising precipitation marked the end of the late Pleistocene at 12,200 yrs BP, and drought occurred in the early to mid-Holocene (10,000 – 3,000 yrs BP). Emphasized here are high-resolution analyses of geochemical (XRF) and fossil diatom data across the LGIT, from which we infer limnological and catchment changes, which we link to abrupt changes in climate....
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