TY - JOUR
T1 - Hydrological variability in southeastern Patagonia and explosive volcanic activity in the southern Andean Cordillera during Oxygen Isotope Stage 3 and the Holocene inferred from lake sediments of Laguna Potrok Aike, Argentina
AU - Haberzettl, Torsten
AU - Kück, Barbara
AU - Wulf, Sabine
AU - Anselmetti, Flavio
AU - Ariztegui, Daniel
AU - Corbella, Hugo
AU - Fey, Michael
AU - Janssen, Stephanie
AU - Lücke, Andreas
AU - Mayr, Christoph
AU - Ohlendorf, Christian
AU - Schäbitz, Frank
AU - Schleser, Gerhard H.
AU - Wille, Michael
AU - Zolitschka, Bernd
PY - 2008/3/24
Y1 - 2008/3/24
N2 - Seismic reflection studies in the maar lake Laguna Potrok Aike (51°58′ S, 70°23′ W) revealed an erosional unconformity associated with a sub-aquatic lake-level terrace at a water depth of 30m. Radiocarbon-dated, multi-proxy sediment studies of a piston core from this location indicate that the sediment below this discontinuity has an age of 45kyr BP (Oxygen Isotope Stage 3), and was deposited during an interval of high lake level. In comparison to the Holocene section, geochemical indicators of this older part of the record either point towards a different sediment source or to a different transport mechanism for Oxygen Isotope Stage 3 sediments. Holocene sedimentation started again before 6790cal. yr BP, providing a sediment record of hydrological variability until the present. Geochemical and isotopic data indicate a fluctuating lake level until 5310cal. yr BP. During the late Holocene the lake level shows a receding tendency. Nevertheless, the lake level did not drop below the 30m terrace to create another unconformity. The geochemical characterization of volcanic ashes reveals evidence for previously unknown explosive activity of the Reclús and Mt. Burney volcanoes during Oxygen Isotope Stage 3.
AB - Seismic reflection studies in the maar lake Laguna Potrok Aike (51°58′ S, 70°23′ W) revealed an erosional unconformity associated with a sub-aquatic lake-level terrace at a water depth of 30m. Radiocarbon-dated, multi-proxy sediment studies of a piston core from this location indicate that the sediment below this discontinuity has an age of 45kyr BP (Oxygen Isotope Stage 3), and was deposited during an interval of high lake level. In comparison to the Holocene section, geochemical indicators of this older part of the record either point towards a different sediment source or to a different transport mechanism for Oxygen Isotope Stage 3 sediments. Holocene sedimentation started again before 6790cal. yr BP, providing a sediment record of hydrological variability until the present. Geochemical and isotopic data indicate a fluctuating lake level until 5310cal. yr BP. During the late Holocene the lake level shows a receding tendency. Nevertheless, the lake level did not drop below the 30m terrace to create another unconformity. The geochemical characterization of volcanic ashes reveals evidence for previously unknown explosive activity of the Reclús and Mt. Burney volcanoes during Oxygen Isotope Stage 3.
KW - Argentina
KW - geochemistry
KW - Lacustrine sediments
KW - lake level changes
KW - Palaeoclimate
KW - tephrostratigraphy
UR - http://www.scopus.com/inward/record.url?scp=40149096235&partnerID=8YFLogxK
U2 - 10.1016/j.palaeo.2007.10.008
DO - 10.1016/j.palaeo.2007.10.008
M3 - Article
AN - SCOPUS:40149096235
SN - 0031-0182
VL - 259
SP - 213
EP - 229
JO - Palaeogeography, Palaeoclimatology, Palaeoecology
JF - Palaeogeography, Palaeoclimatology, Palaeoecology
IS - 2-3
ER -