塔西南白垩纪—古近纪钾盐矿成矿条件及成盐模式  

Cretaceous-Paleogene Potassium Metallogenic Condition and Potash-forming Model in the Southwest of Tarim Basin

作　　者：党龙[1] 李盛富[1] 邱余波[1] 刘刚[1] 

机构地区：[1]核工业二一六大队

出　　处：《现代矿业》2017年第6期19-25,共7页Modern Mining

摘　　要：塔里木盆地是一个海陆交替沉积的盆地,经历了前震旦纪结晶变质基底形成、古生代地台发展及中新生代盆地形成三大阶段。在塔里木盆地发展地史上,白垩纪—第三纪曾有过多次大的海侵,带来了丰富的盐类物质成分,又由于干旱封闭的气候环境,使其西部沉积了广阔而厚层的盐岩。结合区内相关地质工作成果,对塔里木盆地西南部拗陷盆地的钾盐成矿条件、成盐模式及成因进行了综合分析,结果表明:(1)塔西南坳陷的成钾条件较好,且成钾有利区块往往位于深水泻湖区,越接近海源的相带越有利于成钾;(2)莎车盆地的阔什塔什地区、吾合沙鲁地区为最有利的成钾远景区,应为塔里木盆地固体钾盐矿勘查优选目标。上述分析对于塔里木盆地继续开展钾盐找矿勘探工作有一定的借鉴价值。Tarim Basin is the one formed by land-sea alternate sedimentary,and it has experienced the three stages of formation of Presinian crystalline metamorphic basement,Paleozoic platform development and formation of Mesozoic Cenozoic basin.In the geological history of Tarim Basin,several large transgression are developed in Cretaceous-Tertiary,so,ample salt compositions are brought,besides that,under the influence of the seal drought climate environment,broad and thick halite is deposited in the south of Tarim Basin.Therefore,the area is always listed as a favorable prospecting target area of potassium.The metallogenic condition,potash-forming model and genesis of the potassium hosted in the depression basin of the southwest of Tarim Basin are analyzed comprehensively,and the coupling relationship between element geochemical characteristics and paleogeographic and paleosalinity is also studied in depth.The results show that：（1）the metallogenic condition of potassium of the depression basin of the southwest of Tarim Basin is good,the favorable potassium metallogenic blocks is located in deep lagoon,besides that,the more closer of phases to sea facies belt,the more beneficial to potassium metallogenic;（2）Kuoshitashi area and Wuheshalu area in Shache Basin are the most favorable potassium metallogenic target areas,they should be taken as the preferably exploration target areas of solid potassium in Tarim Basin.The above analysis results can provide some reference for the further exploration and prospecting work of potassium deposit in Tarim Basin.

关 键 词：钾盐 成矿条件 成盐模式 成因 成矿远景区 

分 类 号：P619.211[天文地球—矿床学]