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

作　　者：杜少荣 董煜 DU Shaorong;DONG Yu(Chinese Academy of Natural Resources Economics,Beijing 101149)

机构地区：[1]中国自然资源经济研究院,北京101149

出　　处：《地球学报》2025年第2期333-342,共10页Acta Geoscientica Sinica

基　　金：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);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。

摘　　要：云南思茅盆地作为我国重要成盐成钾远景区,发育有大量的盐泉。氯同位素结合其他地球化学参数可用以研究不同流体的来源、演化以及盐类矿床的成因。本文分析了来自云南思茅盆地8个盐泉样品的元素及同位素(δ^(37)Cl,δD,δ^(18)O)地球化学特征指标并结合前人的数据和研究成果,探讨了盆地盐泉的补给源、溶质来源及其演化过程。盐泉氢、氧同位素特征显示,盆地盐泉补给高程大约为2000m,补给主要来自周边哀牢山-无量山的大气降水。思茅盆地盐泉元素地球化学,钠氯系数、镁氯系数、溴氯系数,表明盐泉水化学类型为氯化钠型,属溶滤卤水成因,溶质主要来自岩盐溶解。思茅盆地盐泉的氯同位素值揭示溶解的岩盐主要为海相岩盐,盐泉氯来源相对单一。盆地镇沅按板井地区盐泉在形成过程中,溶解了改造后的岩盐,该地区是潜在找钾异常区。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(δ^(37)Cl,δD,δ^(18)O)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.Theδ^(2)H andδ^(18)O characteristics of the salt springs indicate that the elevation of their supply is approximately 2000 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×10^(3)/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 

分 类 号：P619.211[天文地球—矿床学]