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Lake Qinghai sediment geochemistry linked to hydroclimate variability since the last glacial
Jin, Zhangdong1,2; An, Zhisheng1,2; Yu, Jimin3; Li, Fuchun4; Zhang, Fei1

Geochemistry of basin sediments from semi-arid regions is valuable to understand past hydroclimatic changes. Here, we investigate the links of sedimentary geochemistry (Rb, Sr, Ca/Zr, TOC, and %CaCO3), carbonate mineralogy and ostracod shell delta O-18 of Lake Qinghai, a basin proximal to major dust production centers at mid-latitudes of the Northern Hemisphere, to changes in depositional conditions and hydroclimate during the past 32 ka. Surface lacustrine sediments are characterized by low-Rb, high-Sr, low-Rb/Sr, high-%CaCO3 and high-Ca/Zr values, in contrast to the chemical compositions of eolian loess (high-Rb, low-Sr, high-Rb/Sr, low-%CaCO3, and low-Ca/Zr). A direct comparison of soluble Ca and Sr in two short cores with instrumental water discharge data suggests that lacustrine precipitates in Lake Qinghai are dominated by authigenic aragonite formed under Ca2+-limited water conditions, and that the accumulation rate of aragonite dominantly depends on solute fluxes into the lake during the rainy seasons (late May to September). Our high-resolution down-core records show that sediments during the last glacial (similar to 32-19.8 ka) had high-Rb, low-Sr, low-%CaCO3, and low-Ca/Zr, indicating eolian dust (loess) accumulation in a desiccated basin under dry glacial conditions, further supported by grain size and pollen results. This type of sedimentation was maintained during the last deglacial (similar to 19.8-11.5 ka), but interrupted by episodic lacustrine precipitates with high-Sr, high-%CaCO3, high-Ca/Zr, and low-Rb. At similar to 11.5 ka, sedimentary Rb/Sr, Ca/Zr, %CaCO3 and TOC show dramatic and permanent changes, implying an abrupt shift in the atmospheric circulation at the onset of the Holocene in the Lake Qinghai region. Lacustrine precipitates have persisted throughout the Holocene with a maximum during the early to mid-Holocene (similar to 10.5-8.0 ka). Since similar to 8.0 ka, the gradual and significant decreases in aragonite and Sr accumulations in tandem with increasing dust deposit and more positive ostracod delta O-18 may be linked to a weakening of Asian summer monsoons during the mid-to-late Holocene. Overall, our records appear to show a high sensitivity of sediment development and geochemistry in Lake Qinghai to the regional hydroclimate changes since the last glacial. (C) 2015 Elsevier Ltd. All rights reserved.

KeywordSediment Geochemistry Lacustrine Precipitate Hydroclimate ca2+-limited Lake Water Asian Dust Lake Qinghai
WOS HeadingsScience & Technology ; Physical Sciences
WOS KeywordNortheastern Tibetan Plateau ; Chinese Loess Plateau ; Arid Central-asia ; Atmospheric Deposition ; Environmental-changes ; Holocene Climate ; Oxygen-isotope ; Western Part ; Bosten Lake ; Monsoon
Indexed BySCI
WOS Research AreaPhysical Geography ; Geology
WOS SubjectGeography, Physical ; Geosciences, Multidisciplinary
WOS IDWOS:000358097300004
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Document Type期刊论文
Corresponding AuthorJin, Zhangdong
Affiliation1.Chinese Acad Sci, Inst Earth Environm, State Key Lab Loess & Quaternary Geol, Xian 710075, Peoples R China
2.Xi An Jiao Tong Univ, Inst Global Environm Change, Xian 710049, Peoples R China
3.Australian Natl Univ, Res Sch Earth Sci, Canberra, ACT 0200, Australia
4.Nanjing Agr Univ, Coll Resources & Environm Sci, Nanjing 210095, Jiangsu, Peoples R China
Recommended Citation
GB/T 7714
Jin, Zhangdong,An, Zhisheng,Yu, Jimin,et al. Lake Qinghai sediment geochemistry linked to hydroclimate variability since the last glacial[J]. QUATERNARY SCIENCE REVIEWS,2015,122:63-73.
APA Jin, Zhangdong,An, Zhisheng,Yu, Jimin,Li, Fuchun,&Zhang, Fei.(2015).Lake Qinghai sediment geochemistry linked to hydroclimate variability since the last glacial.QUATERNARY SCIENCE REVIEWS,122,63-73.
MLA Jin, Zhangdong,et al."Lake Qinghai sediment geochemistry linked to hydroclimate variability since the last glacial".QUATERNARY SCIENCE REVIEWS 122(2015):63-73.
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