塔里木盆地西部钾盐成矿条件及远景评价

Mineral-formation condition and prospective value of the sylvite in Western Tarim basin,Xinjiang

塔里木盆地西部是中国最重要和最有潜力的固体钾盐矿勘查区之一。本文通过对该地区莎车和库车两个次级坳陷盆地的钾盐成矿条件综合分析,提出塔里木盆地西部莎车盆地的成钾条件整体上优于库车盆地;K+含量、溴含量和溴氯系数与古地理和古盐度呈很好的相关性,元素地球化学特征与古地理、古盐度的耦合关系研究表明成钾有利区块往往位于深水泻湖区,且越接近海源的相带越有利于成钾。综合分析认为,莎车盆地的阔什塔什地区、吾合沙鲁,以及库车盆地大宛其地区具有优越的成钾条件,应为塔里木盆地固体钾盐矿勘查优选目标。

Tarim basin is one of the most important and alive palaeo-potash mine exploration area.This article through to the analysis of mineral-formation condition of sylvite of the region of Shache and Kuche basin,which are two subset depression basin,propose that the forming-potassium conditions of Shache basin are superior to Kuche basin on the whole.The content of potassium and bromine,the factor of bromine and chlorine,present very good correlationship with palaeoareal and palaeosalinity.The couple relationship research of geochemical behavior analysis of element together with palaeoareal and palaeosalinity indicate that the range of profitability of forming-potassium are situated deep water lagoon area,and the phase belts are more close to marine facies where are favour of forming potassium.According to comprehensive analysis,the author thinks Kuoshitashi area、Wuheshalu area in Shache basin and Dawanqi area in Kuche basin has superior forming-potassium conditions,and they should be the optimize exploration target of palaeo-potash mine in Tarim basin.