干旱区生态环境知识资源中心(Arid): 青藏高原兹格塘错沉积物介形虫壳体同位素

Arid

	青藏高原兹格塘错沉积物介形虫壳体同位素
其他题名	Holocene Environmental Changes Derived from Ostracode Shell Stable Isotopes in the Sediment Core of Zigetang Lake,Tibetan Plateau
	张宏亮 1; 刘青利 1; 李世杰 2; 方相林 1; 张吉献 1; 李婷 1
来源期刊	山地学报
ISSN	1008-2786
出版年	2014
卷号	32 期号:3 页码:373-379
中文摘要	兹格塘错是位于藏北高原腹地的封闭型湖泊,其变化过程可直接反映区域气候变化。对一支深727cm沉积岩芯中介形虫进行了壳体同位素分析,发现介形虫壳体氧同位素变化主要取决于壳体形成时的湖水氧同位素组成和湖水温度的变化;封闭湖泊湖水的氧同位素组成主要取决于降水和蒸发比值的变化。兹格塘错介形虫壳体碳、氧同位素变化特征表明两者可能受控于不同的环境因子。介形虫壳体同位素记录反映了全新世气候环境变化的整体特征,同时对晚第四纪特征气候事件都有明确记录,包括8.2ka冷事件、Roman暖期、中世纪暖期以及小冰期等,在响应全球气候变化的过程中又记录了区域间的差异响应。
英文摘要	Located in the hinterland of North Tibetan Plateau,Zigetang Lake is an enclosed lake with bad climate and little precipitation,the regional environment has always been faintly disturbed by human beings,with great evaporation and no glacier in the catchment,the main supply of water comes from surface runoff,and factors of water balance are simple. Thus Zigetang Lake is ideal for study on the climatic evolution of Tibetan Plateau. A 727 cm long core (ZGT02) was obtained at water depth of 30 m in the west of Zigetang Lake,and its AMS age covers the whole Holocene. Ostracode shell stable isotopes analysis used to reconstruct paleoclimatic and environmental change. Limnocythere inopinata is the species for analysis; Results show that the delta~(18)O of the shell is controlled by the delta~(18)O and temperature of the lake water. In closed or semi-closed lake,delta~(18)O is an indicator to effective moisture (ratio of precipitation /evaporation) and mainly controlled by the temperature in arid and semi-arid area. High delta~(18) O indicates high evaporation and low precipitation while low delta~(18)O indicates the contrary ones. The curve of delta~(13) C changed in-phase with that of delta~(18)O would indicate that they were controlled by different factors. These environmental changes and the variations of the lake level reflected by the geochemical of Zigetang Lake sediments are well supported by other research results,at the same time,there are different as the different area.
中文关键词	青藏高原 ; 湖泊沉积 ; 全新世环境 ; 介形虫 ; 壳体同位素
英文关键词	Tibetan Plateau Lake sediments Holocene environment Ostracode shell stable isotopes
语种	中文
国家	中国
收录类别	CSCD
WOS类目	GEOSCIENCES MULTIDISCIPLINARY
WOS研究方向	Geology
CSCD记录号	CSCD:5135281
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/231539
作者单位	1.安阳师范学院, 安阳, 河南 450002, 中国; 2.中国科学院地球化学研究所, 贵阳, 贵州 550002, 中国
推荐引用方式 GB/T 7714	张宏亮,刘青利,李世杰,等. 青藏高原兹格塘错沉积物介形虫壳体同位素[J],2014,32(3):373-379.
APA	张宏亮,刘青利,李世杰,方相林,张吉献,&李婷.(2014).青藏高原兹格塘错沉积物介形虫壳体同位素.山地学报,32(3),373-379.
MLA	张宏亮,et al."青藏高原兹格塘错沉积物介形虫壳体同位素".山地学报 32.3(2014):373-379.