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Water and sediment chemistry of Lake Pumayum Co, South Tibet, China: implications for interpreting sediment carbonate
Ju J. T.; Zhu L. P.; Wang J. B.; Xie M. P.; Zhen X. L.; Wang Y.; Peng P.
Source PublicationJournal of Paleolimnology
2010
Volume43
Issue3
Pages463-474
KeywordCarbonate Lake Sediments Tibetan Plateau Water Chemistry Spatial Distribution Lake Pumayum Co Calcite Precipitation Qinghai Lake Plateau Variability Constance Climate Monsoon Record Basin Area
AbstractA combination of water and sediment chemistry was used to investigate carbonate production and preservation in Lake Pumayum Co (altitude 5,030 m a.s.l.), south Tibet, China. We compared the chemical composition of lake water in various parts of the lake with that of input rivers and found that the loss of Ca(2+) results from calcite sedimentation induced by evaporation and biogenic precipitation. This is supported by evaporation data from the catchment and delta(18)O measurements on water. Results suggest that CaCO(3) is the predominant carbonate in this lake. There is a positive correlation in the sediments among concentrations of total inorganic carbon (TIC), Ca, total organic carbon (TOC), and total nitrogen, confirming that most carbonates in sediment are endogenic. The Jiaqu River is the largest inflow to Lake Pumayum Co and has a strong influence on both lake water chemistry and sediment composition. The river and lake bathymetry influence carbonate sedimentation by affecting water flow velocity and growing conditions for macrophytes. Different carbon contents and relationships between TIC and TOC in the two long cores from different depths in the lake reveal that hypolimnetic conditions also influence carbonate precipitation and preservation.
Indexed BySCI
Language英语
ISSN0921-2728
Document TypeSCI/SSCI论文
Identifierhttp://ir.igsnrr.ac.cn/handle/311030/23727
Collection历年回溯文献
Recommended Citation
GB/T 7714
Ju J. T.,Zhu L. P.,Wang J. B.,et al. Water and sediment chemistry of Lake Pumayum Co, South Tibet, China: implications for interpreting sediment carbonate. 2010.
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