| 青海可可西里盐湖水化学及硼同位素地球化学特征 |
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| 关键词:water chemistry characteristics boron isotope salt lakes Hoh Xil |
| 基金项目:国家“973”项目(编号: 2012CB426501);国家自然科学基金项目(编号: 40772079) |
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| Hydrochemical Characteristics and Boron Isotope Geochemistry of Brine in Hoh Xil, Qinghai Province |
| A study of the hydrochemical characteristics and boron isotope distribution of salt lakes in Hoh Xil region was conducted on the basis of the survey in 2009 and 2010. Besides the Mingjing Lake, Xijinwulan Lake, Lexiewudan Lake, Salt Lake and Cangcuo Lake discovered earlier, the Duoxiu Lake, Chacuo Lake, Bucha Lake and Guomucuomaderi Lake are all salt lakes discovered recently, whose salinities are equal to or higher than 50 g/L. These discoveries have brought the total number of salt lakes in this region to 9. Except for the Lexiewudan salt lake, which is of the chloride type, the remaining 8 salt lakes are of the sulfate type; the boron and lithium are both abundant in the lake water and surrounding waters, and B-Li elements indicate a collaborative growth and decline relationship, suggesting that the material sources, migration conditions and enrichment environment of B is similar to characteristics of Li in this area. The results of Positive Thermal Ionization Mass Spectrometry measurements show that δ11B values are in the range of +4.77‰~+12.52‰, by far lower than the values of seawater, implying that these salt lakes belong to terrigenous nature, which is consistent with the results of previous research on these areas. There are a large number of springs exposed on the northern bank of the Lexiewudan salt lake and Bucha salt lake, and the springs are the primary material sources of these two lakes according to hydrochemical and boron isotopic analysis. The regional tectonic features and boron isotope geochemistry characteristics reveal that the boron element in the Xinqingfeng hot spring is mainly from lixiviation of volcanic rocks in the depth. |
| MA Ru-ying,HAN Feng-qing,MA Hai-zhou,XIAO Ying-kai,MA Yun-qi,ZHANG Yan-xia,WANG Teng,HE Lei,HAN Ji-long,HAN Yao-zong,GUO Jian-feng.2015.Hydrochemical Characteristics and Boron Isotope Geochemistry of Brine in Hoh Xil, Qinghai Province[J].Acta Geoscientica Sinica,36(1):60-66. |
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