塔里木盆地钾盐成矿地质条件分析

塔里木盆地是中国最大的盆地,经历了多期构造运动,形成了三个大的拗陷区:由满加尔凹陷、库车拗陷、阿瓦提拗陷组成的塔东北拗陷区;由于田-民丰-若羌拗陷构成的塔东南拗陷区;由莎车-喀什-叶城拗陷构成的西南拗陷区。根据塔里木盆地地质、古构造、古地理、古气候及地球化学等特征,分析钾盐成矿条件,确定控矿因素,划分成矿远景区。依据盆地(拗陷)面积较大、拗陷内分布有次级拗陷、含盐系及岩盐层分布广,而且厚度较大和具有明显的含钾显示等特点,将塔里木盆地划分了4个钾盐成矿远景区,即满加尔凹陷钾盐成矿远景区、莎车拗陷钾盐成矿远景区、库车拗陷(拜城-阳霞)钾盐成矿远景区和民丰凹陷钾盐成矿远景区。

POTASH DEPOSIT FORMATION GEOLOGICAL CONDITION ANALYSE IN TARIM BASIN

The Tarim Basin,the largest basin in China,many structural have occurred,formed three big depression in Tarim basin. By Manjiaer depression Kuqa depression and Awate depression form of Tadongbei depression area;By Yutian-Minfeng-Nuoqiang depression in the form of Tadongnan depression area;By Shache-Kashi-Yecheng in the form of Taxinan depression area.Besed on study on geological,paleostructural, paleogeography,paleoclimate and geochemical characteristics in Tarim basin,metallogenic conditions and ore-controlling factors of potassiumsalt was analyzed and the metallogenic prospective area was divided. On the basis of basin (depression) with larger area, basin in the distribution of secondary basin (depression), the salt and rock salt are widely distributed and large thickness, has the obvious characteristics of containing potassium. Based on the saliferous strata characteristics and ore forming conditions of potash, the potash ore prospect of Tarim basin can be diyided into four:the potassium mineralization area in Manjiaer depression,the potassium mineralization area in Shache depression, the potassium mineralization area in Baicheng-Yangxia depression and the potassium mineralization area in Minfeng depression.