罗布泊富钾卤水矿床地球化学空间分布特征  

Spatial variability in the geochemical characteristics of the K-rich brines in the Lop Nor

作　　者：王凯 孙明光[1] 马黎春 汤庆峰[3] 颜辉[4] 张瑜 WANG Kai;SUN Mingguang;MA Lichun;TANG Qingfeng;YAN Hui;ZHANG Yu(MNR Key Laboratory of MetaLLogeny and Mineral Assessment,Institute of Mineral Resources,CAGS,Beijing,100037;China University of Geosciences(Beijing),Beijing,100083;Beijijig Center for Physical Chemical Analysis,Beijing 100089;SDIC Xinjiang Lop Nor Potash Co.,Ltd,Hamiy Xinjiang,839000)

机构地区：[1]中国地质科学院矿产资源研究所,自然资源部成矿作用与资源评价重点实验室,北京100037 [2]中国地质大学(北京),北京100083 [3]北京市理化分析测试中心,北京100089 [4]国投新疆罗布泊钾盐有限责任公司,新疆哈密839000

出　　处：《地质学报》2020年第4期1183-1191,共9页Acta Geologica Sinica

基　　金：中央级公益性科研院所基本科研业务费专项资金(No.JYYWF2018);国家重点研发计划项目(No.2017YFC0602806);中国地质调查项目(No.DD20160054)共同资助的成果。

摘　　要：罗布泊是我国最重要的成盐成钾盆地之一,富钾卤水资源丰富。在14年的工业开采过程中,不同矿层卤水的地球化学特征持续处于变化中。为了加强对不同矿区富钾卤水的地球化学空间分布特征的认识,合理开发利用卤水资源,本文应用克里金插值法,对2017年采集的89个常观孔卤水样品进行了空间分析,绘制了K+、Cl-、Na+、Mg2+、Li+、B3+、SO42-等值线图,并对其空间分布特征进行了综合分析,结果显示:K+、Cl-、Mg2+、Li+、B3+等离子具有较为一致的分布趋势,其高值区主要分布在罗北凹地及腾龙矿区北部,低值区主要分布于罗北凹地北部及矿区西南部,而SO42-分布趋势则相反;由于受周缘地区淡水补给的影响,矿区西南部、北部及东南部出现淡化现象,但是淡水只影响到W1、W2层,W3层未见明显淡化现象;2017年罗布泊矿区K+平均含量为8.83g/L,除受淡水影响区域外,矿区内大部分地区样品KCl品位均高于1%的工业单独开采品位,与开采前KCl品位相比,目前罗北凹地W1储层KCl平均品位约下降了9.7%左右。Lop Nor, containing abundant potassium-rich brine, is one of the most important salt-forming basin in China. Past 14 years of industrial mining show changing geochemical characteristics of brines in different ore layers. In order to estimate the spatial geochemical distribution of potassium-rich brines in different mining areas and utilize brine water resources, we have used the Kriging interpolation method to analyse the spatial distribution of 89 brine samples collected in 2017, and drawn the contour maps of K+, Cl-, Na+, Mg2+, Li+, B3+, SO42-. The results show that K+, Cl-, Mg2+, Li+, B3+ have a relatively consistent distribution trend. The high value area is mainly located in the Luobei depression and the northern part of the Tenglong platform, and the low value areas are located in the north of the Luobei depression and southwest of the mining area. However, the SO42- distribution trend is reversed. Due to the influence of freshwater supply from the surrounding areas, desalination occurs in the southwest, north and southeast of the mining area;however, only W1 and W2 layers were affected, and the W3 layer shows no obvious desalination. The average K+ content of Lop Nor is 8.83 g/L. Except for the area affected by fresh water, the KCl grade in most areas was higher than the industrial separate mining grade of 1%. Compared with KCl grade before mining, the average grade of KCl in W1 layer of Luobei depression is about 9.7%.

关 键 词：罗布泊 富钾卤水 空间分布 地球化学 卤水矿床 

分 类 号：P619.211[天文地球—矿床学]