Hein, Andrew S., Cogez, Antoine, Darvill, Christopher M., Mendelova, Monika, Kaplan, Michael R., Herman, Frederic ORCID: 0000-0002-7237-4656, Dunai, Tibor J., Norton, Kevin ORCID: 0000-0002-7995-6464, Xu, Sheng, Christl, Marcus ORCID: 0000-0002-3131-6652 and Rodes, Angel ORCID: 0000-0001-8488-7689 (2017). Regional mid-Pleistocene glaciation in central Patagonia. Quat. Sci. Rev., 164. S. 77 - 95. OXFORD: PERGAMON-ELSEVIER SCIENCE LTD. ISSN 0277-3791

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Abstract

Southern South America contains a glacial geomorphological record that spans the past million years and has the potential to provide palaeoclimate information for several glacial periods in Earth's history. In central Patagonia, two major outlet glaciers of the former Patagonian Ice Sheet carved deep basins similar to 50 km wide and extending over 100 km into the Andean plain east of the mountain front. A succession of nested glacial moraines offers the possibility of determining when the ice lobes advanced and whether such advances occurred synchronously. The existing chronology, which was obtained using different methods in each valley, indicates the penultimate moraines differ in age by a full glacial cycle. Here, we test this hypothesis further using a uniform methodology that combines cosmogenic nuclide ages from moraine boulders, moraine cobbles and outwash cobbles. Be-10 concentrations in eighteen outwash cobbles from the Moreno outwash terrace in the Lago Buenos Aires valley yield surface exposure ages of 169-269 ka. We find Be-10 inheritance is low and therefore use the oldest surface cobbles to date the deposit at 260-270 ka, which is indistinguishable from the age obtained in the neighbouring Lago Pueyrredon valley. This suggests a regionally significant glaciation during Marine Isotope Stage 8, and broad interhemispheric synchrony of glacial maxima during the mid to late Pleistocene. Finally, we find the dated outwash terrace is 70-100 ka older than the associated moraines. On the basis of geomorphological observations, we suggest this difference can be explained by exhumation of moraine boulders. (C) 2017 Elsevier Ltd. All rights reserved.

Item Type: Journal Article
Creators:
CreatorsEmailORCIDORCID Put Code
Hein, Andrew S.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Cogez, AntoineUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Darvill, Christopher M.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Mendelova, MonikaUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Kaplan, Michael R.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Herman, FredericUNSPECIFIEDorcid.org/0000-0002-7237-4656UNSPECIFIED
Dunai, Tibor J.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Norton, KevinUNSPECIFIEDorcid.org/0000-0002-7995-6464UNSPECIFIED
Xu, ShengUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Christl, MarcusUNSPECIFIEDorcid.org/0000-0002-3131-6652UNSPECIFIED
Rodes, AngelUNSPECIFIEDorcid.org/0000-0001-8488-7689UNSPECIFIED
URN: urn:nbn:de:hbz:38-231170
DOI: 10.1016/j.quascirev.2017.03.023
Journal or Publication Title: Quat. Sci. Rev.
Volume: 164
Page Range: S. 77 - 95
Date: 2017
Publisher: PERGAMON-ELSEVIER SCIENCE LTD
Place of Publication: OXFORD
ISSN: 0277-3791
Language: English
Faculty: Unspecified
Divisions: Unspecified
Subjects: no entry
Uncontrolled Keywords:
KeywordsLanguage
LAGO-BUENOS-AIRES; COSMOGENIC-NUCLIDE MEASUREMENTS; SOUTHERNMOST SOUTH-AMERICA; TIERRA-DEL-FUEGO; ANTARCTIC COLD REVERSAL; PRODUCTION-RATES; EXPOSURE AGES; DOME-C; CHRONOLOGY; QUATERNARYMultiple languages
Geography, Physical; Geosciences, MultidisciplinaryMultiple languages
Refereed: Yes
URI: http://kups.ub.uni-koeln.de/id/eprint/23117

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