期刊
JOURNAL OF EARTH SYSTEM SCIENCE
卷 128, 期 8, 页码 -出版社
INDIAN ACAD SCIENCES
DOI: 10.1007/s12040-019-1236-0
关键词
delta Cl-37; brine genesis; saline springs; Nangqen basin
资金
- science and technology project of the Qinghai province [2014-ZJ-702]
Chlorine isotopes can be used to study the evolution of different fluids, sources and the causes of various related deposits. In this study, Cl concentrations and chlorine isotope (delta Cl-37, IAEA ISL-354 NaCl standard) values were determined for brine samples from Nangqen basin, located on the southern boundary of the Qinghai-Tibet plateau to study the source and the processes of these saline springs. The results demonstrated that the saline springs are distributed around a fault or fault zone, with a high average salinity of 228.30g/l and flow rates ranging from 1.7 to 0.01l/s. Na+ and Cl- are the predominant cations and anions, respectively, accounting for more than 90% of the total. The delta Cl-37 values range from -1.55 parts per thousand to +0.97 parts per thousand, and the Cl/Br ratios are from 1739 to 175,260. Coupled with the previous H, O and B isotope compositions (delta D, VSMOW2 standard, ranges from -100.91 parts per thousand to -132.98 parts per thousand, delta O-18, VSMOW2 standard, from -12.88 parts per thousand to -16.05 parts per thousand and delta B-11, NIST 951 standard, from +3.55 parts per thousand to +29.59 parts per thousand), it can be interpreted that the saline springs are mainly the result of the dissolution of halite hosted in mudstone and volcanic country rocks.
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