Lateglacial and Holocene climatic changes in south-eastern Patagonia inferred from carbonate isotope records of Laguna Potrok Aike (Argentina)

Oehlerich, Markus; Mayr, Christoph; Gussone, Nikolaus; Hahn, Annette; Hölzl, Stefan; Lücke, Andreas; Ohlendorf, Christian; Rummel, Susanne; Teichert, Barbara M.A.; Zolitschka, Bernd

doi:10.1016/j.quascirev.2015.02.006

Cited by 23 publications

(13 citation statements)

References 87 publications

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“…Calcium isotopes are fractionated during authigenic carbonate precipitation from aqueous solutions (Gussone and Dietzel, 2016), which preferentially takes light Ca isotopes into the solid (Blättler et al, 2015;Böhm et al, 2012;Gussone et al, 2003;Gussone et al, 2011;Henderson et al, 2006;Holmden, 2009;Jacobson and Holmden, 2008;Nielsen and DePaolo, 2013;Oehlerich et al, 2015;Steuber and Buhl, 2006;Teichert et al, 2005;Tipper et al, 2006;Wang et al, 2012;Wang et al, 2013), consistent with the fractionation displayed by laboratory precipitation experiments of calcite (Gussone et al, 2003;Gussone et al, 2011;Lemarchand et al, 2004;Tang et al, 2008;Tang et al, 2012). If secondary Ca-bearing minerals are causing the observed fractionation of Ca isotopes in the Jinsha River, the fractionation factor in this process can be calculated (Hindshaw et al, 2013).…”

Section: Carbonate Precipitationmentioning

confidence: 99%

Ca isotope constraints on chemical weathering processes: Evidence from headwater in the Changjiang River, China

Chen

Strandmann

et al. 2020

Chemical Geology

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This study aims to clarify the relationship between chemical weathering of rocks and the carbon budget of rivers and to better understand the weathering mechanisms of plateau watersheds. We chose to study the Jinsha River, which originates from the Tibetan Plateau and also is in the upper reaches of the Changjiang River. Analysis of hydrochemistry, radiogenic strontium isotope and stable calcium isotopes were conducted of the Jinsha River water samples, which were collected along its mainstream and main tributaries in the summer. The results show that the water chemistry of the mainstream is dominated by evaporite weathering, which has a low 87 Sr/ 86 Sr (0.7098 to 0.7108) and wide range of Sr contents (2.70 to 9.35 μmol/L). In contrast, tributaries of the Jinsha River have higher 87 Sr/ 86 Sr (0.7090 to 0.7157) and lower Sr contents (~1μmol/L). Moreover, the Ca isotopic compositions in the mainstream (0.87-1.11‰) are heavier than the tributaries (0.68-0.88 ‰) and could not attribute to the conventional mixing of different sources. We suggest that secondary carbonate precipitation fractionates Ca isotopes in the Jinsha River, and fractionation factors are between 0.99935 and 0.99963. At least 66% of dissolved Ca is removed in the mainstream of the Jinsha River through secondary mineral precipitation, and the average value is ~35% in the tributaries. The results highlight that evaporite weathering results in more carbonate precipitation influencing Ca transportation and cycling in the riverine system constrained by stable Ca isotopic compositions and water chemistry.

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Section: Carbonate Precipitationmentioning

confidence: 99%

Ca isotope constraints on chemical weathering processes: Evidence from headwater in the Changjiang River, China

Chen

Strandmann

et al. 2020

Chemical Geology

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“…Chemostratigraphic analyses are commonly undertaken on recent core‐based Quaternary lake carbonates in order to document climatic changes on seasonal to multimillennial time scales (Junge & Bottger, ; Stevens et al ., ; Mangili et al ., , ; Wittkop et al ., ; Oehlerich et al ., ). While δ 13 C and δ 18 O chemostratigraphy is widely used to characterize Pleistocene–Holocene glacial and interglacial periods, it has been only rarely applied for the palaeoenvironmental reconstruction of ancient lacustrine successions (e.g.…”

Section: Discussionmentioning

confidence: 97%

Palaeoenvironmental and diagenetic reconstruction of a closed‐lacustrine carbonate system – the challenging marginal setting of the Miocene Ries Crater Lake (Germany)

et al. 2017

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Chemostratigraphic studies on lacustrine sedimentary sequences provide essential insights on past cyclic climatic events, on their repetition and prediction through time. Diagenetic overprint of primary features often hinders the use of such studies for palaeoenvironmental reconstruction. Here the potential of integrated geochemical and petrographic methods is evaluated to record freshwater to saline oscillations within the ancient marginal lacustrine carbonates of the Miocene Ries Crater Lake (Germany). This area is critical because it represents the transition from shoreline to proximal domains of a hydrologically closed system, affected by recurrent emergent events, representing the boundaries of successive sedimentary cycles. Chemostratigraphy targets shifts related to subaerial exposure and/or climatic fluctuations. Methods combine facies changes with d 13 C-d 18 O chemostratigraphy from matrix carbonates across five closely spaced, temporally equivalent stratigraphic sections. Isotope composition of ostracod shells, gastropods and cements is provided for comparison. Cathodoluminescence and back-scatter electron microscopy were performed to discriminate primary (syn-)depositional, from secondary diagenetic features. Meteoric diagenesis is expressed by substantial early dissolution and dark blue luminescent sparry cements carrying negative d 13 C and d 18 O. Sedimentary cycles are not correlated by isotope chemostratigraphy. Both matrix d 13 C and d 18 O range from ca À7Á5 to +4Á0& and show clear positive covariance (R = 0Á97) whose nature differs from that of previous basin-oriented studies on the lake: negative values are here unconnected to original freshwater lacustrine conditions but reflect extensive meteoric diagenesis, while positive values probably represent primary saline lake water chemistry. Noisy geochemical curves relate to heterogeneities in (primary) porosity, resulting in selective carbonate diagenesis. This study exemplifies that ancient lacustrine carbonates, despite extensive meteoric weathering, are able to retain key information for both palaeoenvironmental reconstruction and the understanding of diagenetic processes in relation to those primary conditions. Also, it emphasizes the limitation of chemostratigraphy in fossil carbonates, and specifically in settings that are sensitive for the preservation of primary environmental signals, such as lake margins prone to meteoric diagenesis. 235

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“…7b). The regional decrease in precipitation during the Late Glacial and alternating wetter and drier periods during the Holocene (Coronato et al, 2011;Massaferro et al, 2012;Schäbitz et al, 2013;Oehlerich et al, 2015;Borromei et al, 2018) may have promoted these environmental changes. During the mid-Holocene, the lower area of the Las Vueltas valley was flooded and became a lagoon in which the clay dated at 7,477 cal yr BP was deposited.…”

Section: Discussionmentioning

confidence: 99%

Late Pleistocene and Holocene geomorphologic evolution of Laguna Las Vueltas area, Tierra del Fuego (Argentina)

Montes

Santiago

Salemme

et al. 2020

andgeo

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Laguna Las Vueltas (LLV) area retains the morphology of a late Pleistocene watershed that was flooded during a mid-Holocene marine transgression. Sediments associated with a paleosol dated at 22,582 cal yr BP reflect subaerial exposure of the area prior to the submergence during the marine transgression. This transgression produced an extensive tidal flat near the mouth of the former LLV watershed by 7,477 cal yr BP. Subsequent decoupling of the Las Vueltas valley from the sea occurred through the growth of a baymouth barrier and a beach-ridge plain to the east. This decoupling turned the lagoon into a pan environment in which subsequent lake-level fluctuations were controlled by climate. A lunette dune developed at the pans in the former lagoon, providing a narrow corridor where humans trapped, killed and processed guanacos as early as 3,402 cal yr BP. Changes in aeolian sedimentation hint at increased aridity during the past 500 years.

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Lateglacial and Holocene climatic changes in south-eastern Patagonia inferred from carbonate isotope records of Laguna Potrok Aike (Argentina)

Cited by 23 publications

References 87 publications

Ca isotope constraints on chemical weathering processes: Evidence from headwater in the Changjiang River, China

Ca isotope constraints on chemical weathering processes: Evidence from headwater in the Changjiang River, China

Palaeoenvironmental and diagenetic reconstruction of a closed‐lacustrine carbonate system – the challenging marginal setting of the Miocene Ries Crater Lake (Germany)

Late Pleistocene and Holocene geomorphologic evolution of Laguna Las Vueltas area, Tierra del Fuego (Argentina)

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