| Evaluation of boron isotopes in halite as an indicator of the salinity of Qarhan paleolake water in the eastern Qaidam Basin, western China | |
Du, Yongsheng; Fan, Qishun ; Gao, Donglin; Wei, Haicheng; Shan, Fashou; Li, Binkai; Zhang, Xiangru; Yuan, Qin; Qin, Zhanjie; Ren, Qianhui; Teng, Xueming
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| 2019-01 | |
| 发表期刊 | GEOSCIENCE FRONTIERS
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| ISSN | 1674-9871 |
| 卷号 | 10期号:1页码:253-262 |
| 摘要 | In this study, nineteen brine samples from the Qarhan Salt Lake (QSL) in western China were collected and analyzed for boron (B) and chlorine (Cl) concentrations, total dissolved solids (TDS), pH values and stable B isotopic compositions. The B concentrations and delta B-11 values of brines in the QSL range from 51.6 mg/L to 138.4 mg/L, and from +9.32 parts per thousand to +13.08 parts per thousand, respectively. By comparison of B concentrations and TDS of brines in QSL with evaporation paths of brackish water, we found that B enrichment of brines primarily results from strong evaporation and concentration of Qarhan lake water. Combining with comparisons of B concentrations, TDS, pH values and d11B values of brines, previously elemental ratios (K/Cl, Mg/Cl, Ca/Cl, B/Cl) and d11B values of halite from a sediment core (ISL1A), we observe good correlations between B concentrations and TDS, TDS and pH values, pH and delta B-11 values of brines, which demonstrate that higher B concentrations and more positive delta B-11 values of halite indicate higher salinity of the Qarhan paleolake water as well as drier paleoclimatic conditions. Based on this interpretation of the delta B-11 values of halite in core ISL1A, higher salinity of the Qarhan paleolake occurred during two intervals, around 46-34 ka and 26-9 ka, which are almost coincident with the upper and lower halite-dominated salt layers in core ISL1A, drier climate phases documented from the delta O-18 record of carbonate in core ISL1A and the paleomoisture record in monsoonal central Asia, and a higher solar insolation at 30 degrees N. These results demonstrate that the delta B-11 values of halite in the arid Qaidam Basin could be regarded as a new proxy for reconstructing the salinity record of paleolake water as well as paleoclimate conditions. (C) 2018, China University of Geosciences (Beijing) and Peking University. |
| DOI | 10.1016/j.gsf.2018.02.016 |
| 引用统计 | |
| 文献类型 | 期刊论文 |
| 条目标识符 | http://ir.isl.ac.cn/handle/363002/34002 |
| 专题 | 盐湖地质与环境实验室 中国科学院青海盐湖研究所 |
| 推荐引用方式 GB/T 7714 | Du, Yongsheng,Fan, Qishun,Gao, Donglin,et al. Evaluation of boron isotopes in halite as an indicator of the salinity of Qarhan paleolake water in the eastern Qaidam Basin, western China[J]. GEOSCIENCE FRONTIERS,2019,10(1):253-262. |
| APA | Du, Yongsheng.,Fan, Qishun.,Gao, Donglin.,Wei, Haicheng.,Shan, Fashou.,...&Teng, Xueming.(2019).Evaluation of boron isotopes in halite as an indicator of the salinity of Qarhan paleolake water in the eastern Qaidam Basin, western China.GEOSCIENCE FRONTIERS,10(1),253-262. |
| MLA | Du, Yongsheng,et al."Evaluation of boron isotopes in halite as an indicator of the salinity of Qarhan paleolake water in the eastern Qaidam Basin, western China".GEOSCIENCE FRONTIERS 10.1(2019):253-262. |
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