Further quantifying the fluxes and contributions of sources to modern sediment in Lake Qinghai, NE Tibetan Plateau

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• 作者：Dejun Wan ; Zhangdong Jin ; Fei Zhang ; Hongyun Chen ; Liumei Chen ; Lei Song…
• 关键词：Suspended particulate matter ; Lacustrine organisms ; Authigenic carbonates ; Lake Qinghai sediment
• 刊名：Limnology
• 出版年：2015
• 出版时间：January 2015
• 年：2015
• 卷：16
• 期：1
• 页码：11-20
• 全文大小：823 KB
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  10. Jin ZD (2010) The inorganic carbon budget of Lake Qinghai (in Chinese with English abstract). Quat Sci 30:1078-086
  11. Jin ZD, You CF, Yu JM (2009a) Toward a geochemical mass balance of major elements in Lake Qinghai, NE Tibetan Plateau: a significant role of atmospheric deposition. Appl Geochem 24:1901-907 CrossRef
  12. Jin ZD, Yu JM, Wang SM, Zhang F, Shi YW, You CF (2009b) Constraints on water chemistry by chemical weathering in the Lake Qinghai catchment, northeastern Tibetan Plateau (China): clues from Sr and its isotopic geochemistry. Hydrogeol J 17:2037-048 CrossRef
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  16. Jin ZD, Zhang F, Li FC, Chen LM, Xiao J, He M (2013) Seasonal and interannual variations of the lake water parameters and particle flux in Lake Qinghai: a time-series sediment trap study (in Chinese with English abstract). J Earth Environ 4(3):1306-313
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• 刊物类别：Biomedical and Life Sciences
• 刊物主题：Life Sciences
  Ecology
  Environment
  Hydrobiology
  
• 出版者：Springer Japan
• ISSN：1439-863X

文摘

Faithfully tracing sources of sediment and then quantifying the flux of each source are the first-order basis for reconstructing paleoclimate and paleoenvironment using lake sediments. The budget of various sources contributing to lake sediment in Lake Qinghai, the largest lake on the Tibetan Plateau, is controversial. In the previous study, the flux of the dust deposition to the modern lake sediment was obtained through 2-year observations, but estimations of other sources have some uncertainties due to inadequate data. In this study our new estimations for the modern Lake Qinghai sediment using new measured data show (1) that contribution (22.1?±?5.2?%) of the fluvial particulate matter is of second significance, only about one-third of the dust deposition, to the modern lake sediment, when its quick deposition near river mouths is not considered, (2) that lacustrine organisms contribute only 5.2?±?1.1?% of the sediment, but account for ~70?% of the organic matter in sediment, and (3) that authigenic carbonates contribute 21.0?±?8.6?% of the sediment and 63.6?% of the total carbonates in the lake sediment, respectively, which is due to a direct precipitation of both Ca2+ and Mg2+ in the modern Ca2+-limited lake. These quantifications are instructive to understand the particulate fluxes to sediment pools in Lake Qinghai under the present conditions and to reconstruct paleoclimate and paleoenvironment via physical and geochemical proxies using past sediments.