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Lithology, radiocarbon chronology and sedimentological interpretation of the lacustrine record from Laguna Potrok Aike, southern Patagonia
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2013 (English)In: Quaternary Science Reviews, ISSN 0277-3791, Vol. 71, 54-69 p.Article in journal (Refereed) Published
Abstract [en]

The 106 m long composite profile from site 2 of ICDP expedition 5022 (PASADO) at Laguna Potrok Aike documents a distinct change in sedimentation patterns from pelagic sediments at the top to dominating mass movement deposits at its base. The main lithological units correspond to the Holocene, to the Lateglacial and to the last glacial period and can be interpreted as the result of distinct environmental variations. Overflow conditions might have been achieved during the last glacial period, while signs of desiccation are absent in the studied sediment record. Altogether, 58 radiocarbon dates were used to establish a consistent age-depth model by applying the mixed-effect regression procedure which results in a basal age of 51.2 cal. ka BP. Radiocarbon dates show a considerable increase in scatter with depth which is related to the high amount of reworking. Validation of the obtained chronology was achieved with geomagnetic relative paleointensity data and tephra correlation.

Place, publisher, year, edition, pages
2013. Vol. 71, 54-69 p.
Keyword [en]
Mixed-effect regression, Mass movement deposits, Lake level fluctuations, Late Pleistocene, Holocene, Patagonia, Argentina, ICDP-project PASADO
National Category
Earth and Related Environmental Sciences
URN: urn:nbn:se:su:diva-92643DOI: 10.1016/j.quascirev.2012.07.019ISI: 000321178500005OAI: diva2:641430


Available from: 2013-08-16 Created: 2013-08-14 Last updated: 2013-08-16Bibliographically approved

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Wastegård, Stefan
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Department of Physical Geography and Quaternary Geology
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