摘要
塔里木盆地是我国重要的成盐盆地,为我国最有远景的找古钾矿地区之一。本文通过多年野外实地调查和大量岩盐样品的化学分析,特别是岩盐中可以指示沉积阶段的Br×103/Cl系数等区域分布特征,联系前人研究资料,分别从构造环境、地层和岩相古地理、地球化学特征等方面进行了成钾条件分析。结果表明,莎车盆地西部喀什坳陷和库车盆地中部拜城坳陷宏观地质特征均有利于钾盐沉积;岩盐地球化学组成相对于正常海相沉积表现出明显的贫Br特征,属海陆交互相或海源陆相沉积。相比之下,莎车盆地的喀什次级坳陷是目前最有前景的找钾远景区。
Tarim Basin, as a large salt deposit basin with long period of sea water invasion in geological age, is a favorable region for potash deposit prospect in China. Based on field observations and analysis of the chemical compositions of many salt rock samples collected in some typical salt ore areas in western Tarim Basin, we discussed the conditions of potash ore developing from the pointview of tectonic environment, sedimentary facies and paleogeography and geochemical characteristics. The results showed that the macroscopic geological property is advantageous for potash deposit in Kashi sag of western Shache subbasin and Baicheng sag of Kuche subbasin. Besides, to geochemical characteristics, the content of bromine in salt rock is clearly lower than that in common marine salt deposits, which indicates that the salt in this region is possibly formed by mixing the sea water with fresh water. Finally, by contrast, the Br×10~3/Cl ratio of salt rock is clearly higher in Kashi sag than that in any other places. Thus we think that the Kashi sag in Shache subbasin is the best promising area to find potash ore deposit in Tarim Basin.
出处
《矿物岩石地球化学通报》
CAS
CSCD
2004年第3期194-199,共6页
Bulletin of Mineralogy, Petrology and Geochemistry
基金
国家305项目(2001BA609A 07 16)
中国科学院创新重要方向性项目(KZCX3 SW 14
37)资助
