Lithology, radiocarbon chronology and sedimentological interpretation of the lacustrine record from Laguna Potrok Aike, southern Patagonia

Kliem, P.; Enters, Dirk; Hahn, Annette; Ohlendorf, Christian; Lisé-Pronovost, Agathe; St‐Onge, Guillaume; Wastegård, Stefan; Zolitschka, Bernd

doi:10.1016/j.quascirev.2012.07.019

Cited by 66 publications

(96 citation statements)

References 62 publications

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“…Sediment samples used in this study are from the composite profile 5022-2CP of site 2, which has a composite depth (cd) of 106 m, consisting of undisturbed pelagic sediments, volcanic tephra layers and mass movement sediments that resulted from lake-internal sediment redistribution. The composite profile is divided into five lithological units based on the prevailing sedimentary structures and frequency of deposits of mass movement (Kliem et al, 2013b). Mass movement deposits and tephra layers were removed from the composite profile resulting in an eventcorrected composite depth profile (cd-ec) of 45.8 m (Kliem et al, 2013b).…”

Section: Methodsmentioning

confidence: 99%

“…The composite profile is divided into five lithological units based on the prevailing sedimentary structures and frequency of deposits of mass movement (Kliem et al, 2013b). Mass movement deposits and tephra layers were removed from the composite profile resulting in an eventcorrected composite depth profile (cd-ec) of 45.8 m (Kliem et al, 2013b). The sediment section investigated in this study ranges between ca.…”

Section: Methodsmentioning

confidence: 99%

“…Error bars represent the range of calibrated ages at 95 % confidence intervals. The previous age-depth model by Kliem et al (2013b) is given as a blue line. The red open square represents the depth of the Reclús R 1 tephra.…”

Section: Methodsmentioning

confidence: 99%

“…Two lithological units (see text for details) occurring in the investigating depth range are shown on the right. bluish-grey colour spectrum compared to dark-and lightgrey laminations of unit B (Kliem et al, 2013b). A 0.2 m long sediment section between 20.2 and 20.4 m (cd) has been newly identified as mass movement deposits and therefore removed from the event-corrected composite depth profile.…”

Section: Methodsmentioning

confidence: 99%

“…The site was investigated within the framework of the interdisciplinary multiproxy ICDP project "Potrok Aike maar lake sediment archive drilling project" (PASADO) and provided a lake sediment record reaching back more than 50 000 years (Ohlendorf et al, 2011;Kliem et al, 2013b;Zolitschka et al, 2013). Palynological and geochemical studies based on the Laguna Potrok Aike sediments have shown the long-term environmental and climatic changes in southern Patagonia throughout the last glacialinterglacial cycle and shed light on the behaviour of the SHW during this transition (e.g.…”

Section: Introductionmentioning

confidence: 99%

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Climate history of the Southern Hemisphere Westerlies belt during the last glacial–interglacial transition revealed from lake water oxygen isotope reconstruction of Laguna Potrok Aike (52° S, Argentina)

Zhu¹,

Lücke²,

Wissel³

et al. 2014

Clim. Past

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Abstract. The Southern Hemisphere Westerlies (SHW) play a crucial role in large-scale ocean circulation and global carbon cycling. Accordingly, the reconstruction of how the latitudinal position and intensity of the SHW belt changed during the last glacial termination is essential for understanding global climatic fluctuations. The southernmost part of the South American continent is the only continental mass intersecting a large part of the SHW belt. However, due to the scarcity of suitable palaeoclimate archives continuous proxy records back to the last glacial are rare in southern Patagonia. Here, we show an oxygen isotope record from cellulose and purified bulk organic matter of submerged aquatic moss shoots from Laguna Potrok Aike (52 • S, 70 • W), a deep maar lake located in semi-arid, extra-Andean Patagonia, covering the last glacial-interglacial transition (26 000 to 8500 cal BP). Based on the highly significant correlation between oxygen isotope values of modern aquatic mosses and their host waters and abundant well-preserved moss remains in the sediment record a high-resolution reconstruction of the lake water oxygen isotope (δ 18 O lw−corr ) composition is presented. The reconstructed δ 18 O lw−corr values for the last glacial are ca. 3 ‰ lower than modern values, which can best be explained by generally cooler air temperatures and changes in the moisture source area, together with the occurrence of permafrost leading to a prolonged lake water residence time. Thus, the overall glacial δ 18 O lw−corr level until 21 000 cal BP is consistent with a scenario of weakened or absent SHW at 52 • S compared to the present. During the last deglaciation, reconstructed δ 18 O lw−corr values reveal a significant two-step rise describing the detailed response of the lake's hydrological balance to this fundamental climatic shift. Rapid warming is seen as the cause of the first rise of ca. 2 ‰ in δ 18 O lw−corr during the first two millennia of deglaciation (17 600 to 15 600 cal BP) owing to more 18 O enriched precipitation and increasing temperature-induced evaporation. Following this interpretation, an early strengthening of the SHW would not be necessary. The subsequent decrease in δ 18 O lw−corr by up to 0.7 ‰ marks a millennial-scale transition period between 15 600 and 14 600 cal BP interpreted as the transition from a system driven by temperature-induced evaporation to a system more dominated by wind-induced evaporation. The δ 18 O lw−corr record resumes its pronounced increase around 14 600 cal BP. This further cumulative enrichment in 18 O of lake water could be interpreted as response to strengthened wind-driven evaporation as induced by the intensification and establishment of the SHW at the latitude of Laguna Potrok Aike (52 • S) since 14 600 cal BP.

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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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