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青海寇查湖碳酸盐方解石中镁含量对湖泊水体盐度变化的响应

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文章导航 > 海洋地质与第四纪地质 > 2011 > 31(1): 135-141

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张菀漪, 张成君, 安娟, 巩俊成, 郭景. 青海寇查湖碳酸盐方解石中镁含量对湖泊水体盐度变化的响应[J]. 海洋地质与第四纪地质, 2011, 31(1): 135-141. doi: 10.3724/SP.J.1140.2011.01135
引用本文: 张菀漪, 张成君, 安娟, 巩俊成, 郭景. 青海寇查湖碳酸盐方解石中镁含量对湖泊水体盐度变化的响应[J]. 海洋地质与第四纪地质, 2011, 31(1): 135-141. doi: 10.3724/SP.J.1140.2011.01135
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ZHANG Wanyi, ZHANG Chengjun, AN Juan, GONG Juncheng, GUO Jing. CONTENT OF MG IN THE CALCITE AS A LAKE SALINITY PROXY IN THE NORTHWEST INLAND CHINA: A CASE OF PRIMARY RESEARCH IN LAKE KOUCHA[J]. Marine Geology & Quaternary Geology, 2011, 31(1): 135-141. doi: 10.3724/SP.J.1140.2011.01135
Citation: ZHANG Wanyi, ZHANG Chengjun, AN Juan, GONG Juncheng, GUO Jing. CONTENT OF MG IN THE CALCITE AS A LAKE SALINITY PROXY IN THE NORTHWEST INLAND CHINA: A CASE OF PRIMARY RESEARCH IN LAKE KOUCHA[J]. Marine Geology & Quaternary Geology, 2011, 31(1): 135-141. doi: 10.3724/SP.J.1140.2011.01135
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青海寇查湖碳酸盐方解石中镁含量对湖泊水体盐度变化的响应

  • 兰州大学 资源环境学院环境科学与工程研究所, 兰州 730000

  • 基金项目:

    国家自然科学基金资助项目(40773064、40041004)

详细信息
    作者简介: 张菀漪(1985-),女,在读硕士,从事环境地球化学研究,E-mail:sunny0211@163.com

  • 中图分类号: P595

CONTENT OF MG IN THE CALCITE AS A LAKE SALINITY PROXY IN THE NORTHWEST INLAND CHINA: A CASE OF PRIMARY RESEARCH IN LAKE KOUCHA

  • College of Resources and Environmental Sciences, Lanzhou University, Lanzhou, 730000

    摘要
  • 通过对青藏高原东南缘560 cm的寇查湖湖心矿物组成、碳酸盐矿物含量以及方解石中镁含量分析,表明方解石中镁含量可能是一个潜在的湖泊盐度指标。湖泊沉积物中总碳酸盐含量有时并不与环境介质的变化一致,其原因主要是沉积物中总碳酸盐主要由方解石组成,而高盐度水体中有较少的方解石的形成。根据5个14C AMS年代分析建立的年代模式,重建了该湖泊3万年来的环境演变过程,560~410 cm (?30~15 kaBP)为河流相沉积;410~320 cm (15~7.6 kaBP)湖泊开始发育,湖泊水体盐度上升成淡水-微咸水,变化较大;320~180 cm (7.6~2.6 kaBP)为湖泊稳定发展时期,但是该时期的湖泊水体盐度较高,成为较咸水的湖泊;180~100 cm (2.6~1.4 kaBP)湖泊水体淡化;100~40 cm (1.4~0.6 kaBP)湖泊水体盐度又有所上升,成为微咸水湖;40~0 cm (0.6 kaBP)以来湖泊水体盐度在早期下降,但大约3000年以来盐度则逐渐上升。
    A-560 m-long core, namely core K-1, collected from the Lake Koucha, a closed to semi-closed lake in the southeastern part of the Tibet Plateau, was carefully studied. We analyzed the mineralogy and carbonate composition of the core samples since 30 kaBP, dated by the age model established upon 5 14C AMS data. Results show that the content of Mg in the calcite can be used as a potential lake salinity proxy in such a closed to semi-closed lake. Based on the changes in salinity, six stages could be recognized since 30 kaBP. Stage 1, 560~410 cm(?30~15 kaBP), it was a fluvial environment. Stage 2, 410~320 cm(15~7.6 kaBP), the Lake Koucha started to germinate, and filled with fresh to oligohaline water. Stage 3, 320~180 cm(7.6~2.6 kaBP), the lake continued to develop and lake water became hyperhaline due to high evaporation. Stage 4, 180~100 cm(2.6~1.4 kaBP), the lake water changed back to fresh. Stage 5, 100~40 cm(1.4~0.6 kaBP), the Lake Koucha became a mesohaline lake again. Stage 6, 40~0 cm(0.6~kaBP), the salinity of the Lake Koucha decreased in the beginning but increased gradually since 3 000 kaBP.
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    • 参考文献(17)
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出版历程
收稿日期:  2010-04-23
修回日期:  2010-07-06

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