全部 标题 作者
关键词 摘要

OALib Journal期刊
ISSN: 2333-9721
费用:99美元

查看量下载量

相关文章

更多...
科学通报  2012 

盐湖卤水蒸发过程中的稳定氯同位素分馏

DOI: 1007/s11434-012-4994-5, PP. 1242-1251

Keywords: 卤水,蒸发,稳定氯同位素,分馏

Full-Text   Cite this paper   Add to My Lib

Abstract:

在28±2℃下进行了察尔汗盐湖卤水的蒸发实验,实验设计为2组,分别为阶段固液相全分离蒸发和固相连续沉积蒸发.在蒸发过程中采集了79件固液样品,并利用基于检测Cs2Cl+的高精度正热电离质谱法进行氯同位素组成测定.根据盐类沉积中Na+,K+,Mg2+的含量变化,整个蒸发过程可分为石盐、光卤石和水氯镁石3个析盐阶段,各析盐阶段固液相间的氯同位素分馏表现出如下特征在整个析盐过程中均表现为正分馏特征,即37Cl在析出相中富集,引起固液相δ37Cl的逐渐降低;石盐具有最高的氯同位素分馏系数(αh),光卤石(αc)次之,水氯镁石(αb)最低;实验中曾发现,析出相转变的瞬期,有异常的反分馏现象出现,即35Cl在析出相中富集,但是卤水和固相δ37Cl值均未出现Eggenkamp等人推算的在光卤石及六水镁石阶段升高的趋势.实验结果表明残余卤水是35Cl的“汇”.实验结果与天然钻孔样品观察到的现象一致,这些结果启示δ37Cl值是一个反映卤水演化阶段的良好指标,对于钾盐勘探工作具有重要意义.

References

[1]  Rosman K J R, Taylor P D P. Isotopic compositions of the elements 1997. Pure Appl Chem, 1998, 70: 217-235
[2]  Kaufmann R, Long A, Bentley H, et al. Natural chlorine isotope variations. Nature, 1984, 309: 338-340
[3]  Kaufmann R S, Long A, Campbell D J. Chlorine isotope distribution in formation waters, Texas and Louisiana. AAPG Bull, 1988, 72: 839-844
[4]  Vengosh A, Chivas A R, McCulloch M T. Direct determination of boron and chlorine isotopic compositions in geological-materials by negative theraml-ionization mass spectrometry. Chem Geol, 1989, 79: 333-343 +
[5]  Xiao Y K, Zhang C G. High precision isotopic measurement of chlorine by thermal ionization mass spectrometry of the Cs2Cl ion. Int J Mass Spec Ion Proc, 1992, 116: 183-192
[6]  Long A, Eastoe C J, Kaufmann R S, et al. High-precision measurement of chlorine stable isotope rations. Geochim Cosmochim Acta, 1993, 57: 2907-2912
[7]  Magenheim A J, Spivack A J, Volpe C, et al. Precise determination of stable chlorine isotopic rations in low-concentration natural samples. Geochim Cosmochim Acta, 1994, 58: 3117-3121
[8]  Volpe C, Spivack A J. Stable chlorine isotopic composition of marine aerosol particles in the western Atlantic Ocean. Geophys Res Lett, 1994, 21: 1161-1164
[9]  Richard A, Banks D A, Mercadier J, et al. An evaporated seawater origin for the ore-forming brines in unconformity-related uranium 37 deposits (Athabasca Basin, Canada): Cl/Br and δ Cl analysis of fluid inclusions. Geochim Cosmochim Acta, 2011, 75: 2792-2810
[10]  Stewart M A, Spivack A J. The stable-chlorine isotope compositions of natural and anthropogenic materials. Rev Mineral Geochem, 2004, 55: 231-254 37
[11]  Willmore C C, Boudreau A E, Spivack A, et al. Halogens of Bushveld Complex, South Africa: δ Cl and Cl/F evidence for hydration melting of the source region in a back-arc setting. Chem Geol, 2002, 182: 503-511
[12]  Liu W G, XiaoY K, Wang Q Z, et al. Chlorine isotopic geochemistry of salt lakes in the Qaidam Basin, China. Chem Geol, 1997, 136: 271-279
[13]  Eggenkamp H G M, Kreulen M R, Koster Van Groos A F. Chlorine stable isotope fractionation in evaporites. Geochim Cosmochim Acta, 1995, 59: 5169-5175
[14]  谭红兵, 马海州, 张西营, 等. 蒸发岩序列中氯化物盐的氯同位素分馏效应及应用——兼论塔里木盆地、柴达木盆地古代岩盐的沉 积阶段. 岩石学报, 2009, 25: 955-962
[15]  郑永飞, 陈江峰. 稳定同位素地球化学. 北京: 科学出版社, 2000. 10-12
[16]  陈郁华. 黄海水 25℃恒温蒸发时的析盐序列及某些微量元素的分布规律. 地质学报, 1983, 57: 379-390
[17]  孙大鹏, 帅开业, 高建华, 等. 氯化物型钾盐矿床氯同位素地球化学的初步研究. 现代地质, 1998, 12: 80-85
[18]  肖应凯, 刘卫国, 张崇耿. 盐湖中盐类矿物沉积过程中氯同位素效应的初步研究. 盐湖研究, 1994, 2: 35-40
[19]  Xiao Y K, Zhou Y M, Wang Q Z, et al. A secondary isotopic reference material of chlorine from selected seawater. Chem Geol, 2002, 182: 655-661
[20]  中国科学院青海盐湖研究所分析室. 卤水和盐的分析方法. 北京: 科学出版社.[J]..1988,:-
[21]  Xiao Y K, Zhou Y M, Liu W G. Precise measurement of chlorine isotopes based on Cs2Cl by thermal ionization mass spectrometry. Anal Lett, 1995, 28: 1295-1304 2- -
[22]  逯海, 肖应凯. SO42-, NO3-对氯同位素测定的干扰及其消除. 盐湖研究, 2001, 9: 7-12
[23]  Schauble E A, Rossman G R, Talor Jr H P. Theoretical estimates of equilibrium chlorine-isotope fractionations. Geochim Cosmochim Acta, 2003, 67: 3267-3281
[24]  Xiao Y K, Liu W G, Zhou Y M, et al. Variations in isotopic compositions of chlorine in evaporation-controlled salt lake brines of Qaidam Basin, China. Chin J Oceanol Limnol, 2000, 18: 169-177
[25]  刘卫国, 肖应凯, 孙大鹏, 等. 马海盐湖区卤水和盐类矿物的氯同位素特征及意义. 盐湖研究, 1995, 3: 29-33
[26]  王庆忠, 肖应凯, 刘卫国, 等. 第四纪察尔汗地区石盐沉积中的氯同位素组成. 盐湖研究, 1995, 3: 40-44
[27]  刘卫国, 肖应凯, 孙大鹏, 等. 柴达木盆地氯同位素组成特征. 地球化学, 1996, 25: 296-303
[28]  刘卫国, 肖应凯, 韩凤清, 等. 昆特依盐湖氯同位素特征及古气候意义. 海洋与湖沼, 1998, 29: 431-435
[29]  Raab M, Spiro B. Sulfur isotopic variations during seawater evaporation with fractional crystallization. Chem Geol: Isot Geosci Sect, 1991, 86: 323-333
[30]  谭红兵, 马海州, 肖应凯, 等. 塔里木盆地西部古岩盐氯同位素发布特征与找钾分析. 中国科学 D辑: 地球科学, 2005, 35: 235-240

Full-Text

Contact Us

service@oalib.com

QQ:3279437679

WhatsApp +8615387084133