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DOI	10.1007/s13146-019-00508-0
	Bromine content and Br/Cl molar ratio of halite in a core from Laos: implications for origin and environmental changes
	Sun, Shurui; Li, Minghui; Yan, Maodu; Fang, Xiaomin; Zhang, Gengxin; Liu, Xiaoming; Zhang, Zengjie
通讯作者	Li, MH (通讯作者)
发表日期	2019
ISSN	0891-2556
EISSN	1878-5212
起始页码	1107
结束页码	1115
卷号	34 期号:3
英文摘要	Bromine (Br) is one of the trace elements in halite. Br content and the Br/chlorine (Cl) molar ratio can be used to reveal dry climates, the degree of evaporation, and/or brine concentration. The Br content of basal halite is more useful than that the Br content of halite from later stages when being used to distinguishing marine from nonmarine origins. Evaporite deposits on the Khorat Plateau (KP) have been a primary source of evaporites in southeastern Asia. The origin (i.e., marine, nonmarine, or a combination of the two) of these deposits is still disputed. In this study, we used the Br concentration of basal halite and the Br/Cl molar ratio to explore the origin of these deposits and the environmental changes that took place in the Late Cretaceous. We analyzed a total of 330 halite samples from borehole ZK2893 for cations (K+, Ca2+, Na+, and Mg2+) and anions (Br-, Cl-, and SO42-). The Br content ranged from 24.04 to 277.87 ppm, and the Br/Cl molar ratio ranged from 0.02 to 0.27 ppm. The low Br content (24.04 ppm) and Br x 10(3)/Cl molar ratio (0.02) of the basal halite suggested that no marine water was in the basin when the halite precipitation began. The temporal variations in the Br content and the Br x 10(3)/Cl molar ratio of halite implied that: (1) the climate in this area during the Late Cretaceous was dry, with two dry stages occurring from 92 to 85 Ma and from 80 to 72 Ma; and (2) the drying trend increased from 92 to 85 Ma and from 80 to 72 Ma, with two extremely dry events occurring during the periods 89-85 Ma and 76-73 Ma.
关键词	SAKHON NAKHON BASIN KHORAT PLATEAU POTASH DEPOSITS SEAWATER CHEMISTRY MARINE EVAPORITES THAILAND DEFORMATION EVOLUTION ISOTOPES
英文关键词	Br; Br; Cl; Saline lake; Origin; Environment; Laos
语种	英语
WOS研究方向	Geology
WOS类目	Geology
WOS记录号	WOS:000483699800044
来源期刊	CARBONATES AND EVAPORITES
来源机构	中国科学院青藏高原研究所
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/259565
推荐引用方式 GB/T 7714	Sun, Shurui,Li, Minghui,Yan, Maodu,et al. Bromine content and Br/Cl molar ratio of halite in a core from Laos: implications for origin and environmental changes[J]. 中国科学院青藏高原研究所,2019,34(3).
APA	Sun, Shurui.,Li, Minghui.,Yan, Maodu.,Fang, Xiaomin.,Zhang, Gengxin.,...&Zhang, Zengjie.(2019).Bromine content and Br/Cl molar ratio of halite in a core from Laos: implications for origin and environmental changes.CARBONATES AND EVAPORITES,34(3).
MLA	Sun, Shurui,et al."Bromine content and Br/Cl molar ratio of halite in a core from Laos: implications for origin and environmental changes".CARBONATES AND EVAPORITES 34.3(2019).