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察尔汗盐湖赋存有硫酸镁亚型和氯化物型两种水化学类型,沉积了中国最大的液体钾镁盐矿床。为解释察尔汗盐湖卤水矿床成因,拟在别勒滩、达布逊、察尔汗和霍布逊区段选择4个剖面,剖面深度在0~7 m之间,属于全新统上含盐组的上部盐层,每隔10cm进行采样,运用XRD半定量方法分析矿物组合特征。结果表明,整个湖区矿物组合由石盐、石膏、水氯镁石和碳酸盐组成,其平均含量分别为>70%、4.7%、3.4%和1%;显示其矿物组合特征简单,盐层主要沉积石盐而贫石膏和碳酸盐矿物。同时,研究发现各区段石膏(硫酸盐矿物)平均含量自西向东明显下降,含镁矿物平均含量自西南向东北明显下降。结合察尔汗盐湖区卤水化学组成和水化学类型的分带,基本符合盐湖北部和东北部卤水富Ca~(2+),贫Mg~(2+)和SO_4~(2-)的沉积事实,进一步说明盐湖北部和东北部卤水和盐类沉积受具有氯化物型盐泉水的补给影响,为察尔汗盐湖混合掺杂成因提供了一定的矿物学证据。
Chaerhan Salt Lake deposits exist magnesium sulfate subtype and chloride type two hydrochemical types, deposited China’s largest liquid potassium magnesium salt deposit. In order to explain the origin of the Chaerhan salt lake brine deposit, it is proposed that four sections should be selected in the Beilun, Dabson, Chalhan and Hobson sections with a depth of 0-7 m, belonging to the salt water of the Holocene The upper salt layer of the group was sampled every 10 cm and the mineral assemblage characteristics were analyzed by semi-quantitative XRD. The results show that the mineral assemblages in the lake are composed of rock salt, gypsum, bischofite and carbonate with the average contents of> 70%, 4.7%, 3.4% and 1%, respectively. The mineral assemblages are characterized by simple features, Sedimentary salt and lean gypsum carbonate minerals. At the same time, the study found that the average content of gypsum (sulfate minerals) in each section decreased significantly from west to east, and the average content of magnesium minerals decreased significantly from southwest to northeast. Combined with the chemical composition and hydrochemical zonation of brine in Chaerhan Salt Lake, it is basically in accordance with the fact that brine is rich in Ca 2+, Mg 2+ and SO 4 2- in the northern and northeast of salt lake. , Which further indicates that the brine and salt deposits in the northern and northeastern part of the salt lake are affected by the supply of chloride-type salt spring water and provide some mineralogical evidence for the mixed doping of the Chaerhan salt lake.