柴达木盆地昆特依盐湖大盐滩矿区卤水地球化学特征分析

The Geochemistry Characteristics Analysis of Brine in Kunty Salt Lake, Qaidam Basin

中文关键词:  昆特依  卤水  地球化学特征  相关性

英文关键词:Kunty  Brine  Geochemistry characteristics  Ion correlation

中文摘要:

      大盐滩作为柴达木盆地重要的液体钾盐赋存地之一,开展卤水水文地球化学研究能够有效指导钾矿的合理、长期开采。利用改进的Collins图、相关性系数、变异系数及离子等值线图等地球化学分析手段,探讨了该地区卤水水化学变化特征及影响因素。结果显示,目前该地区的卤水类型均为Cl-Na型；研究区内主要卤水化学成分变异程度不大,Na⁺及Cl-在空间上呈东北高、西南低的分布特征,其余离子均表现出反向的分布规律；研究区内地球化学特征变化除了受到溶滤作用影响外,还在很大程度上受到卤水开采及淡水补给的影响；卤水开采及淡水补给从某种程度上改变了沉积层的物理结构,使地层渗透系数的不均匀性增强；人工淡水补给能够渗入到卤水潜水层中,从而增加可开采卤水量,但对卤水矿化度的影响情况尚不明确。

英文摘要:

      The demand for potassium resource increases with the rapid development of agriculture in China. The Kunty is one of the most important potash deposits in Qaidam Basin, and the studies on the geochemistry characteristics will give a guide to the sustainable potassium ore exploitation.By using the methods of modified Collins diagram, variable coefficient, ions isogram and ion correlation analysis, the geochemistry characteristics and influence factors were analyzed in the paper.The results show that the hydrochemical type of the brine is Cl-Na. All the variable coefficients of the brine ions in the study area haven’t reached to 1, the concentrations of Na⁺ and Cl- are high in the northeast of the Kunty and much lower in the southwest. The concentrations of other ions show an opposite variation characteristics. Except the leaching, the brine exploitation and water supplement also play an important role in the geochemistry variation. The brine exploitation changed the structure of the ore deposit and made the permeability coefficient show a heterogeneous characteristics. The water supplement increased the amount of brine which can be exploited, but it has no obvious influence on the degree of mineralization.