云南镇沅地区盐泉水成因与找钾研究  

Genesis of Saline Springs and Potassium-prospecting in Zhenyuan Area,Yunnan

作　　者：秦西伟 马海州[2,3] 张西营 胡夏嵩[1] 李国荣 程怀德[2,3] 韩积斌[2,3] 李永寿[2,3] 苗卫良 蒋子文[1] 韩文华 宋芊[1] QIN Xi-wei;MA Hai-zhou;ZHANG Xi-ying;HU Xia-song;LI Guo-rong;CHENG Huai-de;HAN Ji-bin;LI Yong-shou;MIAO Wei-liang;JIANG Zi-wen;HAN Wen-hua;SONG Qian(Department of Geological Engineering,Qinghai University,Xining,810016,China;Key Laboratory of Comprehensive and Highly Efficient Utilization of Salt Lake Resources,Qinghai Institute of Salt lakes,Northwest Institute of Eco-Environment and Resources,Chinese Academy of Sciences,Xining,810008,China;Qinghai Provincial Key Laboratory of Geology and Environment of Salt Lake Qinghai Institute of Salt Lakes,Northwest Institute of Eco-Environment and Resources,Chinese Academy of Sciences,Xining,810008,China)

机构地区：[1]青海大学地质工程系,青海西宁810016 [2]中国科学院青海盐湖研究所,中国科学院盐湖资源综合高效利用重点实验室,青海西宁810008 [3]青海省盐湖地质与环境重点实验室,青海西宁810008

出　　处：《盐湖研究》2023年第3期18-28,共11页Journal of Salt Lake Research

基　　金：青海省自然科学基金资助项目(No.2021-ZJ-937Q);第二次青藏高原科学考察计划项目(No.2019QZKK0805);青海大学地质资源与地质工程重点学科(No.41250103)。

摘　　要：云南思茅盆地是我国重要的含盐盆地,其南部分布着我国目前发现的唯一具有工业开采价值的勐野井固体钾盐矿床。镇沅地区位于思茅盆地整董含盐带,广泛发育白垩纪蒸发岩、碎屑沉积物及盐泉水。本文通过元素及同位素(δ^(2)H,δ^(18)O,δ^(37)Cl)地球化学指标,系统分析了镇沅含盐带盐泉水水源、溶质来源、热储温度及循环演化模式,探讨了区域成钾潜力。氢氧同位素特征显示,盐泉水源于周边山脉(哀牢山和无量山)雨水和/或冰雪融水的补给;元素特征显示,盐泉水溶质主要源于卤化物矿物(岩盐)溶滤,部分源于硫酸盐矿物(石膏、硬石膏)及含Ca碳酸盐矿物(霰石、方解石、白云石)溶滤;稳定氯同位素特征显示,岩盐溶滤是盐泉水的主要Cl源,大气降水补给及水—岩(火山岩、泥岩和砂岩)相互作用是盐泉水的次要Cl源;盐泉水热储温度估测范围为44.3~72.4℃,循环深度估测范围为914~1 884 m。水化学特征系数显示,盐泉水为岩盐溶滤成因水,含盐地层封闭性较好,变质程度较高。直接及间接找钾指标均显示镇沅地区郭河村及大河边村是找钾异常集中区,可能具有找钾远景。Simao Basin in Yunnan province is an important salt-bearing basin in China.The Mengyejing solid potash deposit is located in the south of Simao Basin,which has uniqe industrial mining value.Zhenyuan area is located in the ZhengDong salt belt of Simao Basin,and cretaceous evaporites,clastic sediments and saline spring water are widely developed in this place.Based on the hydrochemistry and isotopes(δ^(2) H,δ^(18)O,δ^(37)Cl),this paper systematically analyzed the recharge source,solute source,reservoir temperatures,circulation evo⁃lution model of saline spring water in Zhenyuan area,and it also discussed the potash exploration prospect in study area.The hydrogen and oxygen isotope characteristics indicate that the saline springs in this study are mainly derived from meteoric water and/or ice and snow melt from the surrounding mountains(Ailao Mountain and Wuliang mountain).The element characteristics show that the solute source of saline springs is mainly de⁃rived from the leaching of halide minerals(rock salt),and partly from the leaching of sulfate minerals(gyp⁃sum,anhydrite)and Ca-carbonate minerals(aragonite,calcite,dolomite).The stable chlorine isotope charac⁃teristics show that rock salt leaching is the main Cl source of saline springs,while atmospheric precipitation recharge and water-rock interaction(volcanic rock,mudstone and sandstone)are the secondary Cl sources of saline springs.The estimated reservoir temperatures for the saline springs range from 44.3~72.4℃and its es⁃timated circulation depths range from 914 m to 1884 m.The hydrochemical characteristic coefficient shows that saline springs in this study are of rock salt solution filtrates genetic water,and the salt bearing strata have good sealing and high metamorphism degree.Both direct and indirect potassium exploration indexes show that Guohe village and Dahebian Village in Zhenyuan area are abnormal concentration areas for potassium explora⁃tion,which can be considered to be the most promising areas in search for potash ore.

关 键 词：补给源 溶质源 循环演化 找钾异常 热储温度 

分 类 号：P578.32[天文地球—矿物学]