干旱区生态环境知识资源中心(Arid): 柴达木贝壳堤剖面元素地球化学与环境演变

Arid

	柴达木贝壳堤剖面元素地球化学与环境演变
其他题名	ELEMENTAL GEOCHEMISTRY AND PALEOENVIRONMENT EVOLUTION OF SHELL BAR SECTION AT QARHAN IN THE QAIDAM BASIN
	张文翔 1; 张虎才 1; 雷国良 2; 杨伦庆 1; 牛洁 2; 常凤琴 2; 杨明生 2; 樊红芳 2
ISSN	1001-7410
出版年	2008
卷号	28 期号:5 页码:917-928
中文摘要	通过对柴达木盆地察尔汗古湖贝壳堤沉积物中酸溶与残留（酸不溶）组分中常、微量元素及其元素对的分析，并结合酸溶与残留组分中常、微量元素相关性对比，讨论了贝壳堤剖面元素地球化学指标和沉积环境之间的关系，指出酸溶组分中的常量、微量元素及其元素对可以作为湖泊和古气候演化良好的代用指标；残留组分中的元素及元素对与原岩及其风化程度紧密相关，因此，酸溶组分与残留组分中的常量和微量元素在对于环境响应模式存在一定差异，应该将二者分开研究以避免对元素所携带环境信号解译的偏差。根据元素地球化学指标重建了43．522．4cal．kaB．P．（39．717．5kaB．P．14C年代）柴达木盆地察尔汗古湖高湖面期间古气候与环境演变过程：43．5～31．7kaB．P．期间酸溶组分中元素含量总体较低，残留组分中元素含量相对较高，且湿润度值（（Fe2O3＋Al2O3）／（MgO＋CaO），或H）处于高值段，而Ca／Mg，Fe／Mn和Rb／Sr
英文摘要	Based on the analytical results of the major and trace elements of the acid soluble （AS） and insoluble （AI） fractions of the Shell Bar section from the Qaidam Basin in the NE Tibetan Plateau,and the correlations between the related elements and their ratios,the depositional environment of the section was discussed. The results show that the major and trace elements and their ratios of AS are good proxies of the salinity, redox condition, and temperature of the lake, and the elements and their ratios of AI were related with source material and chemical weathering. Because of these different environmental significances, we need to distinguish the AS and AI, and avoid drawing inaccurate conclusions during the environmental reconstruction. According to these proxies, the paleoenvironment change history between 43.5kaB. P. and 22.4kaB. P. （ 39.7 ~ 17.5kaB. P. 14C ） was reconstructed. During the period between 43.5 - 31.7kaB. P., the lower values of Ca/Mg, Fe/Mn, Rb/Sr and concentrations of some elements in the AS,and the higher values of humid degree （（ Fe2O3 ＋ Al2O3 ）/（ MgO ＋ CaO）or ＂ H＂）ratio and elements contents of the AS show that the climate was warm and wet,and the paleolake level was high. Especially during 37.8- 31.7kaB. P. ,concentrations of some elements in the AS and Ca/Mg, Fe/Mn, Rb/Sr ratios are the lowest, element contents of the AI and H ratio are both high,which imply that the lake lake reached its maximum level and the organism in the lake were blooming. Between 31.7kaB. P. and 22.4kaB. P. the higher values of Ca/Mg, Fe/Mn, Rb/Sr and concentrations of some elements in the AS,the lower value of H and element contents of the AI demonstrate that the climate started to deteriorate, with the precipitation amount particularly decreased, the evaporation strongly increased, and the lake level started to decrease. The climate deteriorated abruptly around 22.4kaB. P. The lake level decreased suddenly,strong evaporation resulted in the formation of the salt layer in the top of the studied section,and the paleolake disappeared in the end. The paleolake level change history could be correlated with the records in Tengger desert and the Badain Jaran-Ejina Basin. It could also be correlated with the paleolake evolution on Tibetan Plateau and the ice core records. The widely spread high paleolake levels in arid North Western China and Tibetan Plateau implies that the climate, especially the hydrological circulation patten during the Late Pleistocene was completely different from that of today. This might give us useful clues to understand the climate situation which was crucial for human and life evolution during the period.
中文关键词	察尔汗湖 ; 贝壳堤剖面 ; 元素地球化学 ; 环境演变
英文关键词	Qarhan paleolake Shell Bar section chemical elements paleoenvironment evolution
语种	中文
国家	中国
收录类别	CSCD
WOS类目	GEOLOGY ; GEOSCIENCES MULTIDISCIPLINARY
WOS研究方向	Geology
CSCD记录号	CSCD:3387505
来源机构	兰州大学
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/222193
作者单位	1.中国科学院南京地理与湖泊研究所, 湖泊与环境国家重点实验室, 南京, 江苏 210008, 中国; 2.兰州大学资源环境学院, 西部环境教育部重点实验室, 兰州, 甘肃 730000, 中国
推荐引用方式 GB/T 7714	张文翔,张虎才,雷国良,等. 柴达木贝壳堤剖面元素地球化学与环境演变[J]. 兰州大学,2008,28(5):917-928.
APA	张文翔.,张虎才.,雷国良.,杨伦庆.,牛洁.,...&樊红芳.(2008).柴达木贝壳堤剖面元素地球化学与环境演变.,28(5),917-928.
MLA	张文翔,et al."柴达木贝壳堤剖面元素地球化学与环境演变".28.5(2008):917-928.