重庆地区早中三叠世主要成盐盆地海相钾盐找钾潜力分析  

Potash-prospecting Potential Analysis of Early-Middle Triassic Marine Potash in Chongqing Main Salt-Forming Basins

作　　者：张雄 赵海彤 毛玲玲 刘成林 栾进华 张瑞刚 罗旭 王勇 胡峰 朱正杰 ZHANG Xiong;ZHAO Haitong;MAO Lingling;LIU Chenglin;LUAN Jinhua;ZHANG Ruigang;LUO Xu;WANG Yong;HU Feng;ZHU Zhengjie(Chongqing Key Laboratory of Resource and Environmental Effects of Major Geological Events(Chongqing Institute of Geology and Mineral Resources),Chongqing,401120,China;School of Earth Sciences,China University of Geosciences,Wuhan,430074,China;Baise University,Baise,533000,China)

机构地区：[1]重大地质事件资源环境效应重庆市重点实验室(重庆地质矿产研究院),重庆401120 [2]中国地质大学(武汉)资源学院,湖北武汉430074 [3]百色学院,广西百色533000

出　　处：《盐湖研究》2024年第6期41-47,共7页Journal of Salt Lake Research

基　　金：重庆市自然科学基金面上项目(CSTB2022NSCQ-MSX0570);国家自然科学基金青年科学基金项目(41902092);重庆市绩效激励项目(cstc2021jxjl900003);重庆市规划和自然资源局科技计划项目(KJ-2023012)。

摘　　要：重庆地区是我国古代海相钾盐找矿的重要区域,但一直未取得找矿突破。文章对合川盐盆、长寿-垫江盐盆、忠县盐盆、万州区盐盆等主要成盐区含盐地层找钾潜力进行了分析。系统收集了区内盐矿勘查成果,补充测试了合川、长寿、垫江等地区三叠系岩盐样品。结果显示,长寿-垫江盐盆三叠系岩盐中存在原生杂卤石矿物,K^(+)含量达到3.82%,合川盐盆岩盐样品中也存在原生杂卤石矿物,K^(+)含量达到3.71%,忠县盐盆和万州盐盆岩盐钾含量较低,未发现含钾矿物。长寿-垫江盐盆古卤水浓缩程度较高,大部分样品溴氯系数显示达到钾石盐析出阶段,其次为合川盐盆,忠县和万州盐盆古卤水浓缩程度较低,主要在岩盐析出阶段。综合分析认为早中三叠世时期,重庆地区古气候炎热,古卤水浓缩程度较高,长寿-垫江盐盆内次级凹陷,具有较好的找钾潜力。Chongqing region is one of important areas for the exploration of ancient marine potash deposit in China,but no significant breakthroughs have been made in this field.This paper analyzed the potential for potash formation in the salt-bearing strata of the main salt-bearing areas such as the Hechuan Salt Basin,Changshou-Dianjiang Salt Basin,Zhongxian Salt Basin,and Wanzhouqu Salt Basin.This paper systematically collected the mine exploration results of Chongqing region,and some salt samples from Hechuan,Changshou and Dianjiang were obtained and tested.Results show that there are primary polyhalite minerals in the Triassic rock salt of Changshou-Dianjiang Salt Basin,with K^(+)content reaching 3.82%.There are also primary polyhalite minerals in the rock salt samples of Hechuan Salt Basin,with K^(+)content reaching 3.71%.In the Zhongxian Salt Basin and Wanzhouqu Salt Basin,potassium contents are low and no potassium minerals are present.The concentration of ancient brine in Changshou-Dianjiang Salt Basin is high,and ratios of bromine(Br)and chlorine(Cl)of most samples show that they have reached the stage of potassium salt mineral precipitation,followed by the Hechuan Salt Basin.The Br concentration in Zhongxian and Wanzhouqu Salt Basin is low,mainly at the stage of rock salt precipitation.The comprehensive analysis shows that Chongqing area has a good potassium formation conditions in the Early-Middle Triassic with hot paleoclimate and high concentration of ancient brine.The sub-depression areas in Changshou-Dianjiang Salt Basin has preferable potash-prospecting potential.

关 键 词：重庆地区 海相钾盐 找钾潜力 早中三叠世 

分 类 号：P619.211[天文地球—矿床学]