Boron isotope geochemistry of a brine-carbonate system in the Qaidam Basin, western China

doi:10.1016/j.sedgeo.2019.02.011

ISL OpenIR > 盐湖地质与环境实验室

	Boron isotope geochemistry of a brine-carbonate system in the Qaidam Basin, western China
	Zhang, Xiangru; Li, Qingkuan; Qin, Zhanjie; Fan, Qishun; Du, Yongsheng; Wei, Haicheng; Gao, Donglin; Shan, Fashou
	2019-04-01
发表期刊	SEDIMENTARY GEOLOGY
ISSN	0037-0738
卷号	383 页码:293-302
摘要	The boron (B) isotope-pH proxy for marine carbonates has been widely used to reconstruct past ocean pH values. Unlike seawater, the apparent dissociation constant of boric acid (K-B) and the delta B-11 values of brines from the terrestrial salt lakes in western China vary. However, relevant studies concerning the B isotope geochemistry of brine-carbonate systems in terrestrial salt lakes are limited. In this study, thirty-nine clastic samples from a sediment core (ISL1A) from the Qarhan Salt Lake in the Qaidam Basin were collected. These carbonates were analyzed for delta B-11, B, Mg, Sr and Ca. Using our new data as well as published pH values, total dissolved solids (TDS), element concentrations, and delta B-11 values of brines in western China, we reached the following conclusions. (1) During evaporation process, salinity increases, the delta B-11 values of brines in salt lakes increase, and the pK(B) (-logK(B)) and pH values simultaneously decrease. (2) The large heterogeneity in the delta B-11 values of the carbonates (-2.74 parts per thousand to +7.64 parts per thousand.) from core ISLIA is mainly due to the delta B-11 values of the brines, rather than pK(B) and pH. (3) B isotopic fractionation with a small alpha(carbonate-brine) of 0.997 in a brine-carbonate system conforms to the Rayleigh fractionation model. (4) Our comparison of the delta B-11 values of these carbonates with other records from core ISL1A suggests that the delta B-11 values of the carbonates in the arid Qaidam Basin can be used as a new proxy for the salinity of paleo-lake water. (C) 2019 Elsevier B.V. All rights reserved.
DOI	10.1016/j.sedgeo.2019.02.011
引用统计
文献类型	期刊论文
条目标识符	http://ir.isl.ac.cn/handle/363002/34016
专题	盐湖地质与环境实验室中国科学院青海盐湖研究所盐湖资源与化学实验室
推荐引用方式 GB/T 7714	Zhang, Xiangru,Li, Qingkuan,Qin, Zhanjie,et al. Boron isotope geochemistry of a brine-carbonate system in the Qaidam Basin, western China[J]. SEDIMENTARY GEOLOGY,2019,383:293-302.
APA	Zhang, Xiangru.,Li, Qingkuan.,Qin, Zhanjie.,Fan, Qishun.,Du, Yongsheng.,...&Shan, Fashou.(2019).Boron isotope geochemistry of a brine-carbonate system in the Qaidam Basin, western China.SEDIMENTARY GEOLOGY,383,293-302.
MLA	Zhang, Xiangru,et al."Boron isotope geochemistry of a brine-carbonate system in the Qaidam Basin, western China".SEDIMENTARY GEOLOGY 383(2019):293-302.

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