globalchange  > 过去全球变化的重建
DOI: 10.1016/j.quascirev.2012.05.024
Scopus记录号: 2-s2.0-84878948287
论文题名:
Ikaite precipitation in a lacustrine environment - implications for palaeoclimatic studies using carbonates from Laguna Potrok Aike (Patagonia, Argentina)
作者: Oehlerich M.; Mayr C.; Griesshaber E.; Lücke A.; Oeckler O.M.; Ohlendorf C.; Schmahl W.W.; Zolitschka B.
刊名: Quaternary Science Reviews
ISSN: 2773791
出版年: 2013
卷: 71
起始页码: 46
结束页码: 53
语种: 英语
英文关键词: ICDP project PASADO ; Lacustrine carbonate ; Oxygen isotope fractionation ; Stable isotopes
Scopus关键词: Aquatic environments ; Atmospheric conditions ; ICDP project PASADO ; Oxygen isotope fractionations ; Palaeoenvironmental reconstruction ; Stable isotope fractionations ; Stable isotopes ; Stable oxygen isotopes ; Calcium carbonate ; Isotopes ; Lakes ; Lasers ; Minerals ; Oxygen ; Sedimentary rocks ; Calcite ; calcite ; calcium carbonate ; freezing ; Holocene ; ikaite ; isotopic fractionation ; lacustrine deposit ; lacustrine environment ; marine environment ; oxygen isotope ; paleoenvironment ; precipitation (chemistry) ; reconstruction ; sediment chemistry ; stable isotope ; temperature effect ; Argentina ; Laguna Potrok Aike ; Santa Cruz [Argentina]
英文摘要: The monoclinic mineral ikaite (CaCO3 · 6H2O) and its pseudomorphs are potentially important archives for palaeoenvironmental reconstructions. Natural ikaite occurs in a small temperature range near freezing point and is reported mainly from marine and only rarely from continental aquatic environments. Ikaite transforms to more stable anhydrous forms of CaCO3 after an increase in temperature or when exposed to atmospheric conditions. The knowledge about conditions for natural ikaite formation, its stable isotope fractionation factors and isotopic changes during transformation to calcite is very restricted. Here, for the first time, primary precipitation of idiomorphic ikaite and its calcite pseudomorphs are reported from a subsaline lake, Laguna Potrok Aike, in southern Argentina. The calculated stable oxygen isotope fractionation factor between lake water and ikaite-derived calcite (αPAI=1.0324 at a temperature of 4.1°C) is close to but differs from that of primarily inorganically precipitated calcite. Pseudomorphs after ikaite rapidly disintegrate into calcite powder that is indistinguishable from μm-sized calcite crystals in the sediment record of Laguna Potrok Aike suggesting an ikaite origin of sedimentary calcites. Therefore, the Holocene carbonates of Laguna Potrok Aike have the potential to serve as a recorder of past hydrological variation. © 2012 Elsevier Ltd.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/60608
Appears in Collections:过去全球变化的重建

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作者单位: Dept. of Earth and Environmental Sciences, Ludwig-Maximilians Universität München, D-80333 Munich, Germany; Geo-Bio-Center, Ludwig-Maximilians Universität München, D-80333 Munich, Germany; Institute of Bio- and Geosciences, IBG-3 - Agrosphere, Forschungszentrum Jülich, D-52428 Jülich, Germany; Dept. of Chemistry, Ludwig-Maximilians Universität München, D-81377 Munich, Germany; IMKM, University of Leipzig, D-04275 Leipzig, Germany; GEOPOLAR, Institute of Geography, University of Bremen, D-28359 Bremen, Germany

Recommended Citation:
Oehlerich M.,Mayr C.,Griesshaber E.,et al. Ikaite precipitation in a lacustrine environment - implications for palaeoclimatic studies using carbonates from Laguna Potrok Aike (Patagonia, Argentina)[J]. Quaternary Science Reviews,2013-01-01,71
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