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

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.