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Chinese Science Bulletin

, Volume 55, Issue 7, pp 621–627 | Cite as

Spatial pattern of modern sedimentation rate of Qinghai Lake and a preliminary estimate of the sediment flux

  • Hai XuEmail author
  • XiaoYan Liu
  • ZhiSheng An
  • ZhaoHua Hou
  • JiBao Dong
  • Bin Liu
Articles Geology

Abstract

We investigated the spatiotemporal distribution of 137Cs radioactivity in surface sediment of Qinghai Lake, and developed the spatial pattern of sedimentation rate. The 137Cs inventory is higher near the estuary/bank area, but lower at the central lake. On the other hand, the average 137Cs activity is lower near the estuary/bank area, but higher at the central lake. The mass accumulation rate (MAR) and the fluxes and contents of the terrestrial detritus (e.g. SiO2, Fe2O3, and Ti) are higher near the estuary/bank area, but lower at the central lake. The chemical/biogenic deposits (e.g. the autogenic carbonates) take up higher fractions at the central lake. These suggest that the spatial pattern of recent sedimentation rate is dominated by the deposition of terrestrial detritus. The average MAR (0.0337g·cm−2·a−1) was estimated based on those of different cores of Qinghai Lake and was verified by a Ca mass-balance method. The fluxes of total lake sediments, terrestrial detritus, and direct atmospheric deposits were also estimated.

Keywords

Qinghai Lake sedimentation rate 137Cs sediment flux 

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Copyright information

© Science in China Press and Springer-Verlag GmbH 2009

Authors and Affiliations

  • Hai Xu
    • 1
    Email author
  • XiaoYan Liu
    • 1
    • 2
  • ZhiSheng An
    • 1
  • ZhaoHua Hou
    • 1
  • JiBao Dong
    • 1
  • Bin Liu
    • 1
    • 2
  1. 1.State Key Laboratory of Loess and Quaternary Geology, Institute of Earth EnvironmentChinese Academy of SciencesShaanxiChina
  2. 2.Graduate University of Chinese Academy of SciencesBeijingChina

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