【摘要】 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,因此一直被列为我国有利的找钾远景区。本文通过对塔里木盆地西部的莎车和库车两个次级拗陷盆地的钾盐成矿条件综合分析,并结合元素地球化学特征与古地理、古盐度的耦合关系等研究表明:莎车盆地的成钾条件整体上优于库车盆地,而且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;莎车盆地的阔什塔什地区,吾合沙鲁地区以及库车盆地大宛其地区具最有利成钾远景区,应为塔里木盆地固体钾盐矿勘查优选目标。更多还原

【Abstract】 The Tarim basin has undergone several seawater invasions from Cretaceous to Tertiary during the basin evolution, which brought abundant sources of salty materials. Then under extremely drought climate environment, wide and thick beds of salt rock accumulated in the west of the Tarim basin. Therefore,it has been regarded as a favorable and important region to explore potash ore in our country. Based on the analysis of mineral-formation conditions of sylvite in two depression sub-basins, the Shache and Kuche basins, combined with the study of coupling relationships between the element geochemical characteristics and palaeoareal and palaeosalinity, we propose that the forming-potassium conditions of the Shache basin are superior to the Kuche basin on the whole. The results also indicate that the favorable blocks of forming-potassium are situated in deep water lagoon, and the belts close to marine facies are better for forming potassium. It can be concluded that Kuoshitashi and Wuheshalu in the Shache basin and the Dawanqi area in the Kuche Basin have the best conditions for the formation of potassium so that they should be the prior exploration targets of solid sylvite deposits in the Tarim basin.更多还原