Chlorine isotopes in sediments of the Qarhan Playa of China and their paleoclimatic significance

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• 作者：Chongguang Luo^a ; ^b ; ^{luochongguang@vip.gyig.ac.cn" class="auth_mail" title="E-mail the corresponding author} ; ^{luo1985180@qq.com" class="auth_mail" title="E-mail the corresponding author} ; Hanjie Wen^a ; ^{wenhanjie@vip.gyig.ac.cn" class="auth_mail" title="E-mail the corresponding author} ; Yingkai Xiao^b ; ^{xiaoyk@isl.ac.cn" class="auth_mail" title="E-mail the corresponding author} ; Haizhou Ma^b ; Qishun Fan^b ; Yunqi Ma^b ; Yanling Zhang^b ; Xiuqun Yang^c ; Maoyong He^d
• 关键词：Chlorine isotope ; Qarhan Playa ; Brine ; Salt deposit ; China
• 刊名：Chemie der Erde - Geochemistry
• 出版年：2016
• 出版时间：March 2016
• 年：2016
• 卷：76
• 期：1
• 页码：149-156
• 全文大小：2253 K

文摘

This study presents chlorine isotopic composition of salt deposits recovered in a core from the Qarhan Saline Lake in the Qinghai Province of China. The δ³⁷Cl trend has three stages, and they correspond to the upper, middle, and lower salt-bearing groups of the entire evaporite system. The δ³⁷Cl values are between −0.22‰ and 0.13‰ with an average value of −0.02‰ in the lower salt-bearing group. It ranges between 0.14‰ and 0.76‰ (${\displaystyle \overline{x}}$ = 0.36‰) in the middle salt-bearing group, and varies between −0.35‰ to 0.35‰ (${\displaystyle \overline{x}}$ = −0.04‰) in the upper salt-bearing group. This work indicates that stratification of δ³⁷Cl values is accompanied by stratigraphic variations in Mg/Cl and K/Cl in halite. We suggest a “evaporation cycles model” and it indicates the potential of Cl isotope as a geochemical tracer in order to understand paleoclimatic conditions during different stages of evaporite deposition.