Characteristics of chlorine isotope distribution and analysis on sylvinite deposit formation based on ancient salt rock in the western Tarim Basin

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	Characteristics of chlorine isotope distribution and analysis on sylvinite deposit formation based on ancient salt rock in the western Tarim Basin
	Tan, HB ; Ma, HZ; Xiao, YK ; Wei, HZ ; Zhang, XY; Ma, WD
	2005-11-01
发表期刊	SCIENCE IN CHINA SERIES D-EARTH SCIENCES
卷号	48 期号:11 页码:1913-1920
关键词	The Tarim Basin Chlorine Isotope Ancient Salt Rock Ancient Sylvinite Deposit Deposit Stage
摘要	During formation of the Tarim Basin, there repetitively happened seawater invasion for it was ever connected with wide Paleo-mediterranean Sea. At the same time, for the application of tectonic and paleoenvironmental condition, the basin deposits many sequences of thick strata of evaporites, especially in its two largest subbasins of Kuqa in the north and Shaqa in the southwest. Therefore, the western Tarim Basin has been considered to be a favorable location to prospect ancient sylvinite deposit. But it is unfortunate that the Brx10(3)/Cl ratio, as a common geochemical index to uncover clues of sylvinite deposit, is almost invalid to indicate the stage of ancient brine condensation for very low content of bromine in salt rock samples (less than 10(-6) commonly) in the western Tarim Basin evaporites. Fortunately, we noticed recently that the values of chlorine isotope (delta(37)Cl value) for salt rock samples follow some clear laws from place to place, which in the Shaqa subbasin, all delta(37)Cl Values of salt rock samples behaved negatively and on the contrary, they all surprisingly showed positive values in the Kuqa subbasin. Based on conclusions of previous research and referring to the ratios of Brx10(3)/Cl for salt rock or brine samples, we proved that the chlorine isotope (delta(37)Cl) could be used as an effective index to find ancient sylvinite deposit in those evaporites rock basin with low content of Br element background, such as the Tarim Basin. Thus according to the new index of chlorine isotope, we conclude that the concentration of ancient brines formed ancient salt rocks is much more concentrated in the Shaqa subbasin than that in the Kuqa subbasin. Particularly, the delta(37)Cl value of salt rock in Kashi depression of the western Shaqa subbasin is greatly negative (<-1.00 parts per thousand), which may predicate that the ancient brine has been concentrated to the terminal stage of salt deposit or even the later stage of sylvinite deposit, Then it is possible to find sylvinite-bearing deposits around the western region (periphery of Kashi depression) of the Shaqa subbasin if we carry out more careful exploration in later works.
语种	英语
引用统计
文献类型	期刊论文
条目标识符	http://ir.isl.ac.cn/handle/363002/5630
专题	青海盐湖研究所知识仓储中国科学院青海盐湖研究所盐湖地质与环境实验室
作者单位	1.Chinese Acad Sci, Inst Salt Lakes, Xining 810008, Peoples R China 2.Chinese Acad Sci, Grad Sch, Beijing 100039, Peoples R China
推荐引用方式 GB/T 7714	Tan, HB,Ma, HZ,Xiao, YK,et al. Characteristics of chlorine isotope distribution and analysis on sylvinite deposit formation based on ancient salt rock in the western Tarim Basin[J]. SCIENCE IN CHINA SERIES D-EARTH SCIENCES,2005,48(11):1913-1920.
APA	Tan, HB,Ma, HZ,Xiao, YK,Wei, HZ,Zhang, XY,&Ma, WD.(2005).Characteristics of chlorine isotope distribution and analysis on sylvinite deposit formation based on ancient salt rock in the western Tarim Basin.SCIENCE IN CHINA SERIES D-EARTH SCIENCES,48(11),1913-1920.
MLA	Tan, HB,et al."Characteristics of chlorine isotope distribution and analysis on sylvinite deposit formation based on ancient salt rock in the western Tarim Basin".SCIENCE IN CHINA SERIES D-EARTH SCIENCES 48.11(2005):1913-1920.