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Fractionation of chlorine isotope in salt mineral sequences and application: Research on sedimentary stage of ancient salt rock deposit in Tarim Basin and western Qaidam Basin.
Tan HongBing1,2; Ma HaiZhou2; Mang XiYing2; Xu JianXin2; Xiao YingKai2
2009-04-01
Source PublicationACTA PETROLOGICA SINICA
Volume25Issue:4Pages:955-962
SubtypeArticle
AbstractThe brine must have evaporated to reach the late stage of sylvinite precipitation and must have continued to concentrate the salts for a long time. Then, it is possible to form potash deposit. Hence, this paper, examines the isotopic composition of different sequences of halite, sylvite and carnallite minerals for man made chemical solutions and salt lake brine evapo-concentrated precipitations, ancient potash deposits in an attempt to examine whether chlorine isotopic ratios can be used to study potash deposits and then be utilized to prospect for new potash deposits in the Tarim Basin and western Qaidam Basin. The results show that delta(37) Cl values of the precipitates or salt deposits decreased systematically during the main phase of halite crystallization. Generally, the sequence of delta(37) Cl values ill salt rock is early precipitated halite (> 0 parts per thousand) > late precipitated halite (< 0 parts per thousand) > sylvite (<-0.5 parts per thousand) > carnallite (< - 1.0 parts per thousand). Hence, delta(37) Cl in salts can be used as an indicator of evaporation stage. Based on this, we conclude that the concentration of ancient brines formed ancient salt rocks is much more concentrated in Tarim-Shache subbasin than that in Tarim-Kuche subbasin. Particularly, the delta(37) Cl values of salt rock in Kashi depression of western Shache 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 later stage of sylvinite deposit. Then it is possible to find sylvite hearing deposits around the western region of the Shache subbasin. But to the western Qaidam Basin, all the delta(37) Cl values of Tertiary salt rock deposit samples from Youdunzi, Nanyishan, Shizigou and Tulingou depressions show obviously positive, which indicate that they are early halite deposits and the primary brine do not evapo-concentrate to reach the late stage of potash hearing minerals precipitation. Therefore, there maybe have no much more hope to find potash deposit in Tertiary salt rock deposit of western Qaidam Basin. The late stage of highly evapo-concentrated brines possibly moved to the south area.
KeywordEvaporite Chlorine Isotope Sedimentary Stage Tarim Basin Western Qaidam Basin
WOS HeadingsScience & Technology ; Physical Sciences
WOS KeywordIONIZATION MASS-SPECTROMETRY
Indexed BySCI
Language英语
WOS Research AreaGeology
WOS SubjectGeology
WOS IDWOS:000265945600019
Citation statistics
Document Type期刊论文
Identifierhttp://ir.isl.ac.cn/handle/363002/5894
Collection青海盐湖研究所知识仓储
盐湖地质与环境实验室
Affiliation1.Hohai Univ, State Key Lab Hydrol Water Resources and Hydraul, Nanjing 210098, Peoples R China
2.Chinese Acad Sci, Inst Salt Lakes, Xining 810008, Peoples R China
Recommended Citation
GB/T 7714
Tan HongBing,Ma HaiZhou,Mang XiYing,et al. Fractionation of chlorine isotope in salt mineral sequences and application: Research on sedimentary stage of ancient salt rock deposit in Tarim Basin and western Qaidam Basin.[J]. ACTA PETROLOGICA SINICA,2009,25(4):955-962.
APA Tan HongBing,Ma HaiZhou,Mang XiYing,Xu JianXin,&Xiao YingKai.(2009).Fractionation of chlorine isotope in salt mineral sequences and application: Research on sedimentary stage of ancient salt rock deposit in Tarim Basin and western Qaidam Basin..ACTA PETROLOGICA SINICA,25(4),955-962.
MLA Tan HongBing,et al."Fractionation of chlorine isotope in salt mineral sequences and application: Research on sedimentary stage of ancient salt rock deposit in Tarim Basin and western Qaidam Basin.".ACTA PETROLOGICA SINICA 25.4(2009):955-962.
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