青藏高原东北部希门错湖岩心粒度特征及其环境意义

类延斌, 张成君, 尚华明, 张虎才, 李佳佳

类延斌, 张成君, 尚华明, 张虎才, 李佳佳. 青藏高原东北部希门错湖岩心粒度特征及其环境意义[J]. 海洋地质与第四纪地质, 2006, 26(3): 31-38.
引用本文: 类延斌, 张成君, 尚华明, 张虎才, 李佳佳. 青藏高原东北部希门错湖岩心粒度特征及其环境意义[J]. 海洋地质与第四纪地质, 2006, 26(3): 31-38.
LEI Yan-bin, ZHANG Cheng-jun, SHANG Hua-ming, ZHANG Hu-cai, LI Jia-jia. THE GRAIN SIZE CHARACTERISTICS OF XIMENCUO LAKE CORE IN THE NORTHEAST TIBET PLATEAU AND ITS ENVIRONMENTAL SIGNIFICANCE[J]. Marine Geology & Quaternary Geology, 2006, 26(3): 31-38.
Citation: LEI Yan-bin, ZHANG Cheng-jun, SHANG Hua-ming, ZHANG Hu-cai, LI Jia-jia. THE GRAIN SIZE CHARACTERISTICS OF XIMENCUO LAKE CORE IN THE NORTHEAST TIBET PLATEAU AND ITS ENVIRONMENTAL SIGNIFICANCE[J]. Marine Geology & Quaternary Geology, 2006, 26(3): 31-38.

青藏高原东北部希门错湖岩心粒度特征及其环境意义

基金项目: 

中科院冰心与寒区环境开放实验室基金项目

国家自然科学基金项目(49871072)

详细信息
    作者简介:

    类延斌(1981-),男,硕士,从事全球环境变化研究,E-mail:leiyb03@st.lzu.edu.cn

  • 中图分类号: P512.32

THE GRAIN SIZE CHARACTERISTICS OF XIMENCUO LAKE CORE IN THE NORTHEAST TIBET PLATEAU AND ITS ENVIRONMENTAL SIGNIFICANCE

  • 摘要: 位于青藏高原东北部的希门错为一冰川深水湖,流域面积小,受人类活动影响较小,忠实地记录了湖泊的自然演化过程。结合希门错湖区特点,对沉积物的粒度特征进行了详细分析。希门错岩心的黏土含量在20%~60%之间,粗砂含量在0~10%之间,粉砂含量在20%~80%之间。粒度参数用矩值法求得,平均粒径(Φ值)为6.0~8.5,标准偏差为0.8~3.0,偏度分布范围在-1.0~1.0之间,峰度为1.0~25.0。频率分布曲线存在众数粒径为0.6、1.0、8、30和200 μm的次总体。众数粒径为1 μm的次总体在7.3~6.0 m成为沉积物的主体,显示了极弱的水动力条件,为湖面结冰的情况下形成。众数粒径为8和30 μm的次总体为沉积物的主体,分别代表了弱的水动力环境和强的水动力环境,指示了深水和浅水两种环境。结合有机质含量和磁化率两个指标,对整段岩心的沉积特征进行了分析,发现整段岩心经历了5次较大的环境变化:12.80~7.30 m有机质含量最低,磁化率最高,粗砂含量几乎为零,黏土含量较高,湖水较深,水动力条件较弱;7.30~6.25 m有机质含量低,磁化率下降,沉积物主要由黏土组成,湖面结冰时间更长,沉积环境更加稳定;6.25~5.00 m有机质含量和磁化率剧烈波动,粗砂明显增多,湖水较浅,水动力条件较强;5.00~3.55 m有机质含量快速升高,磁化率下降,粗砂含量仍然较高,水动力条件较强,但水位比前一阶段有所升高;3.55~0 m有机质含量最高,磁化率最低,粗砂含量降低,湖水较深,降水量较大,水动力条件减弱。
    Abstract: Ximencuo(33°23',101°08') in the northeast of Tibet Plateau is a modern glacial lake.The mean water depth is more than 40 m,and there is little disturbance of human activity, so the core can record the environmental changes. A continuous 12.8 m-long core was taken from the center of the lake in 2004. We analyzed the grain size characteristics and reconstructed the sedimentary environment of the core.
    The high percentage of clay (20%~80%) indicates that the water depth of the sampling place is deep at most time of the core. The high sand content means low lake level and high lake energy. The high standard deviation of the core was caused by the glacial environment. The grain size frequency distribution curves and cumulative distribution curves that reflect different grain size contents are also very useful to reconstruct paleo-environment of the lake. 7.30~6.25 m section with high clay content (40%~80%) indicates that the lake level was high and the lake surface frozen. 6.25~5.00 m section shows that the sand content increased sharply (8%~10%), which means the lake level dropped suddenly because of dry and cold climate. 5.00~3.55 m section indicates that organic content increased sharply with the magnetic susceptibility decreasing accordingly,which means the climate became warmer and wetter. 3.55~0 m shows the highest organic content and the lowest magnetic susceptibility. The sand content decreases and the clay content increases,meaning a warm climate and high lake level except two abrupt dry events at the beginning. Further researches,together with other indexes, are needed to get more detailed information.
  • [1]

    Heinrich H.Origin and consequences of cyclic ice rafting in the northeast Atlantic Ocean during the past 130000 years[J]. Quaternary Science Reviews, 1988,29:143-152.

    [2]

    Gerard Bond,William Showers.A pervasive millennial-scale cycle in north Atlantic Holocene and glacial climates[J]. Science,1997,278:1257-1266.

    [3]

    Gerard Bond,Bernd Kromer.Persistent solar influence on North Atlantic climate during the Holocene[J].Science,2001,294:2130-2136.

    [4]

    Porter S C, An Z S. Correlation between climate events in the North Atlantic and China during the last glaciation[J]. Nature, 1995, 375:305-308.

    [5] 陈敬安,万国江,徐经意.洱海沉积物粒度记录与气候干湿变迁[J].沉积学报,2000,18(3):341-345.

    [CHEN Jing-an,WAN Guo-jiang,XU Jing-yi.Sediment particle sizes and the dry-humid transformation of the regional climate in Erhai lake[J].Acta Sedimentologic Sinica,2000,18(3):341-345.]

    [6]

    CHEN Jing-an,WAN Guo-jiang,TANG De-gui. Recent climate changes recorded by sediment grain sizes and isotopes in Erhai Lake[J].Progress in Natural Science,2003,10(3):253-259.

    [7] 刘兴起,王苏民,沈吉.青海湖QH-2000钻孔沉积物粒度组成的古气候古环境意义[J].湖泊科学,2003,15(6):112-117.

    [LIU Xing-qi,WANG Su-min,SHEN Ji.The grain size of core QH-2000 in Qinghai Lake and its implication for paleoclimate and paleoenvironment[J].Journal of Lake Sciences,2003,15(6):112-117.]

    [8] 王君波,朱立平.藏南沉错沉积物的粒度特征及其古环境意义[J].地理科学进展,2002,21(5):459-467.

    [WANG Jun-bo,ZHU Li-ping. Grain-size characteristics and their paleo-environmental significance of Chen Co Lake sediments in southern Tibet[J].Progress in Geography,2002,21(5):459-467.]

    [9] 周静,王苏民,吕静.洱海地区一万多年以来气候环境演化的湖泊沉积记录[J].湖泊科学,2003,15(2):104-111.

    [ZHOU Jing,WANG Su-min,LU Jing.Climatic and environmental change from the sediment record of Erhai Lake over the past 10000 years[J].Journal of Lake Sciences,2003,15(2):104-111.]

    [10] 孙东怀,安芷生,苏瑞侠,等.古环境中沉积物粒度组分分离的数学方法及其应用[J].自然科学进展,2001,11(3):269-276.

    [SUN Dong-huai, AN Zhi-sheng, SU Rui-xia.Mathematical approach to sedimentary component partitioning of polymodal sediments and its application[J].Progress in Natural Science,2001,11(3):269-276.]

    [11] 孙东怀,鹿化煜,David Rea.中国黄土粒度的双峰分布及其古气候意义[J].沉积学报,2000,18(3):327-335.

    [SUN Dong-huai, LU Hua-yu, David Rea.Bimode grain-size distribution of Chinese loess and its paleoclimate implication[J].Acta Sedimentologic Sinica,2000,18(3):327-335.]

    [12] 王苏民,薛滨,夏威岚.西门错2000多年来气候变化的湖泊记录[J].第四纪研究,1997,17(1):62-69.

    [WANG Su-min,XUE Bin,XIA Wei-lan.Lake record of climatic change in the past 2000 years of Ximen Cuo[J].Quaternary Sciences,1997,17(1):62-69.]

    [13] 伍光和.青海省综合自然区划[M].兰州:兰州大学出版社,1989.[WU Guang-he.The Natural Geography of Qinghai Province[M]. Lanzhou University Press, 1989.]
    [14]

    van der Plicht J, Beck J W, Bard E,et al.Comparison/Calibration 14C records 26~50 cal.kaBP[J].Radiocarbon, 46(3):1225-1234.

    [15] 莱尔曼A.湖泊的化学地质学和物理学[M].王苏民,等译.北京:地质出版社,1989.[Lerman A.The Lacustrine Chemistry, Geology and Physics[M].Translated by WANG Su-min,et al.Beijing:Geologic Publishing House, 1989.]
    [16] 殷勇,方念乔,王倩.云南中甸纳帕海湖泊沉积物的磁化率及环境意义[J].地理科学,2002,22(4):413-419.

    [YIN Yong, FANG Nian-qiao, WANG Qian.Magnetic susceptibility of lacustrine sediments and its environmental significance:evidence from Napahai lake, northwestern Yunnan, China[J].Scientic Geographica Sinica, 2002,22(4):413-419.]

    [17] 黄思静.用Excel计算沉积物粒度分布参数[J].成都理工学院学报,1999,26(2):196-198.

    [HUANG Si-jing. Calculation of grain size distribution parameter of sediments by Microsoft Excel[J].Journal of Chengdu University of Technology, 1999,26(2):196-198.]

    [18] 成都地质学院陕北队.沉积岩(物)粒度分析及其应用[M].北京:地质出版社,1978.[Shanbei Team of Chengdu Geological College.Sediment Grain Size Analysis and Its Application[M].Beijing:Geologic Publishing House Press,1978.]
    [20] 张恩楼,沈吉,夏威岚,等.青海湖沉积物有机碳及其同位素的气候环境信息[J].海洋地质与第四纪地质2002,22(2):105-108.

    [ZHANG En-lou,SHEN Ji,XIA Wei-lan,et al.Climatic environmental information of organic carbon and isotopes of Qinghai Lake sediments[J].Marine Geology and Quaternary Geology,2002,22(2):105-108.]

    [21] 杨建强,崔之久,易朝露.云南点苍山冰川湖泊沉积物磁化率的影响因素及其环境意义[J].第四纪研究,2004,24(5):591-597.

    [YANG Jian-qiang, CUI Zhi-jiu, YI Chao-lu.The influencing factors and environmental significance of magnetic susceptibility in the glacio-lacustrine sediments on the Diancang Mountains, Yunnan Province[J].Quaternary Sciences,2004,24(5):591-597.]

    [22]

    M G Eriksson. Mineral magnetic analyses of sediment cores recording recent soil erosion history in central Tanzania[J].Palaeogeography, Palaeoclimatology, Palaeoecology,1999,152:365-383.

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出版历程
  • 收稿日期:  2005-10-18
  • 修回日期:  2005-12-27

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