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CHEMICAL AND BORON ISOTOPE COMPOSITIONS OF NONMARINE BRINES FROM THE QAIDAM BASIN, QINGHAI, CHINA
VENGOSH, A; CHIVAS, AR; STARINSKY, A; KOLODNY, Y; BAOZHEN, Z; PENGXI, Z
1995-02-01
Source PublicationCHEMICAL GEOLOGY
Volume120Issue:1-2Pages:135-154
SubtypeArticle
AbstractThe general chemistry and boron isotope composition were investigated in fresh waters and hypersaline brines from the Qaidam Basin, northern Qinghai-Xizang (Tibet) Plateau, China. This basin is a large, tectonically active system, isolated from the ocean and composed of thick elastic and evaporite sediments. The modern playas are subject to intense evaporation and are characterized by hypersaline brines as well as potash and borate evaporites. The chemical composition of the dissolved solutes in the modern brines and waters reveals three main sources: (1) inflow of hot springs enriched in sodium, sulphate and boron. Evaporation of these waters leads to a high Na/Cl ratio (>1), a Na-Cl-SO4 brine and an evaporite mineral assemblage of halite-mirabilite-borate (Lakes Daqaidam and Xiaoqaidam); (2) inflow surface river waters which are modified by preferential dissolution of halite and potassium and magnesium salts characterized by a Na-(Mg)-Cl solute type with low Na/Cl (<1), Br/Cl, Li/Cl and B/Cl ratios; and (3) Ca-chloridic subsurface brines which are controlled by both salt dissolution and dolomitization processes. Evaporation and salt crystallization of mixtures of the latter two types leads to a ''marine-like'' brine (e.g., a Na-Mg-Cl type, Na/Cl ratio <<1) and mineral assemblages similar to that predicted for progressive evaporation of seawater (e.g., Qarhan playa: halite-sylvite-carnallite-bischofite). The delta(11)B-values of the input waters to the Qaidam Basin (range of -0.7 to +10.9 parts per thousand vs. NBS-951) and brines from salt lakes (+0.5 to +15.0 parts per thousand) are similar to those of associated granitic rocks (delta(11)B = -2.3 to +3.7 parts per thousand; n = 3) and hence indicate the non-marine origin of these fluids. The highest delta(11)B-values are associated with fluids with low B/Li ratios, indicating selective removal of elemental boron and B-10 by adsorption onto clay minerals. The magnitude of B-11 enrichment due to adsorption is similar to 15-20 parts per thousand, and thus non-marine brines are well distinguished from marine-derived brines (delta(11)B of +39 to +59 parts per thousand) preserving the large isotopic difference (similar to 40 parts per thousand) of their source waters. It is proposed to use this distinctive isotopic signature for tracing the origin of ancient evaporite environments.
WOS HeadingsScience & Technology ; Physical Sciences
WOS KeywordIONIZATION MASS-SPECTROMETRY ; NEGATIVE THERMAL-IONIZATION ; POTASH EVAPORITES ; ORIGIN ; NONMARINE ; DEPOSITS ; GEOCHEMISTRY ; EVAPORATION ; ISRAEL ; LAKES
Indexed BySCI
Language英语
WOS Research AreaGeochemistry & Geophysics
WOS SubjectGeochemistry & Geophysics
WOS IDWOS:A1995QK51900008
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Document Type期刊论文
Identifierhttp://ir.isl.ac.cn/handle/363002/6002
Collection青海盐湖研究所知识仓储
Affiliation1.AUSTRALIAN NATL UNIV, RES SCH EARTH SCI, CANBERRA, ACT 0200, AUSTRALIA
2.HEBREW UNIV JERUSALEM, DEPT GEOL, IL-91904 JERUSALEM, ISRAEL
3.ACAD SINICA, QINGHAI INST SALT LAKES, XINING 810008, PEOPLES R CHINA
Recommended Citation
GB/T 7714
VENGOSH, A,CHIVAS, AR,STARINSKY, A,et al. CHEMICAL AND BORON ISOTOPE COMPOSITIONS OF NONMARINE BRINES FROM THE QAIDAM BASIN, QINGHAI, CHINA[J]. CHEMICAL GEOLOGY,1995,120(1-2):135-154.
APA VENGOSH, A,CHIVAS, AR,STARINSKY, A,KOLODNY, Y,BAOZHEN, Z,&PENGXI, Z.(1995).CHEMICAL AND BORON ISOTOPE COMPOSITIONS OF NONMARINE BRINES FROM THE QAIDAM BASIN, QINGHAI, CHINA.CHEMICAL GEOLOGY,120(1-2),135-154.
MLA VENGOSH, A,et al."CHEMICAL AND BORON ISOTOPE COMPOSITIONS OF NONMARINE BRINES FROM THE QAIDAM BASIN, QINGHAI, CHINA".CHEMICAL GEOLOGY 120.1-2(1995):135-154.
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