地球学报2025，Vol.46Issue(2)：333-342,10.DOI:10.3975/cagsb.2024.112101
思茅盆地盐泉氯、氢、氧同位素地球化学特征及地质意义
Isotopic Geochemical Characteristics and Geological Significance of Chlorine,Hydrogen,and Oxygen in Salt Springs of the Simao Basin
摘要
Abstract
The Simao Basin in Yunnan,an important potassium-rich prospective basin in China,has developed a large number of salt springs.Chlorine isotopes,combined with other geochemical parameters of salt springs,can be used to study the sources,evolution,and genesis of various fluids and mineral deposits.This paper analyzes the elemental geochemistry and isotopic characteristics(δ37Cl,δD,δ18O)of eight salt spring samples from the Simao Basin in Yunnan Province.By combining these findings with previous data and research results,it explores the supply sources,solute origins,and evolution processes of salt springs in the basin.The δ2H and δ18O characteristics of the salt springs indicate that the elevation of their supply is approximately 2 000 m with the water primarily coming from atmospheric precipitation in the surrounding Ailao-Wuliang Mountains.The elemental geochemistry,along with the nNa/nCl,nMg/nCl,and Br×103/Cl ratios of the salt springs in the Simao Basin,suggests that the aqueous chemistry type of the saline springs is Na-Cl and that they belong to lixiviation water,with the solutes primarily originating from rock salt dissolution.The chlorine isotope values of the salt springs reveal that the dissolved rock salt is of marine origin,and the chlorine source is singular.During the formation of the salt springs in the Anbanjing area of the basin,transformed rock salt was dissolved,making it a potential area for potassium exploration.关键词
思茅盆地/盐泉/水化学特征/氯同位素/溶质来源/成因演化Key words
Simao Basin/salt spring/hydrochemical characteristics/Cl isotope/solute source/cyclic evolution引用本文复制引用
杜少荣,董煜..思茅盆地盐泉氯、氢、氧同位素地球化学特征及地质意义[J].地球学报,2025,46(2):333-342,10.基金项目
本文由自然资源部高原荒漠区战略性矿产勘查开发技术创新中心开放研究项目"青海省矿产资源战略储备基地评估方法和示范研究"(编号:ODDJ/DKWX(DYZX)2023-03)和自然资源部部门预算项目"全国矿产资源规划编制研究与实施评估"(编号:121102000000180051)联合资助. This study was supported by Ministry of Natural Resources(Nos.ODDJ/DKWX(DYZX)2023-03 and 121102000000180051). （编号:ODDJ/DKWX(DYZX）
