摘要
柴达木盆地深层卤水资源丰富,具有很好的开发利用前景。然而,前期研究主要侧重于柴达木盆地西部和北部地区,对盆地中部深层卤水赋存情况所知甚少,其形成机制尚不明确。本研究以柴达木盆地中部一里坪和西台吉乃尔盐湖周边的深层卤水为研究对象,利用该地区深钻获取的深层卤水样,开展水化学及B同位素组成研究,阐明柴中地区深层卤水水文地球化学特征并初步探讨其成因。分析结果显示,盆地中部深层卤水矿化度较高,为CaCl_(2)型水体。综合各种离子特征系数对研究区深层卤水进行系统分析,发现盆地中部深层卤水的形成与岩盐溶滤作用以及封闭地层条件下强烈的变质作用有关。同时初步推测B同位素来自于深层地热水。常、微量元素的不同来源反映了深层卤水物质来源的"二元结构"特征。本研究结果将为深入认识整个柴达木盆地深层卤水成因机理提供重要的科学依据。
There are abundant deep brine resources in the western Qaidam basin with good prospect of exploitation and utilization.However,previous studies have mainly focused on the western and northern Qaidam basin,and little is known about the occurrence and formation mechanism of deep brine in the central part of Qaidam basin.In this study,the deep brine samples from the Yiliping and the Xitaijinar salt lakes in the central Qaidam basin were investigated.The hydrochemistry and B isotopic composition of the deep brine samples obtained from deep drilling in this area were analysed,and the hydrogeochemical characteristics of the deep brine in the central Qaidam basin were clarified and the origin of the deep brine is discussed.The analysis results show that the deep brine in the middle of the basin has high salinity and is CaCl_(2) type water body.Based on the systematic analysis of the deep brine in the study area,it is found that the formation of the deep brine in the central part of the basin is related to the dissolution and filtration of rock salt and the strong metamorphism under the confined formation conditions.It is suggested that the B isotope was imported from Kunlun Mountain hot spring waters.The different sources of normal and trace elements reflect the"dual structure"characteristics of the material sources of deep brine.The results of this study will provide an important scientific basis for understanding the formation mechanism of deep brine in the whole Qaidam basin.
作者
卢鋆
潘彤
李永寿
李洪普
韩光
苗卫良
张西营
LU Jun;PAN Tong;LI Yongshou;LI Hongpu;HAN Guang;MIAO Weiliang;ZHANG Xiying(Qinghai Institute of Salt Lakes,Chinese Academy of Sciences,Key Laboratory of Comprehensive and Highly Efficient Utilization of Salt Lakes Resources,Chinese Academy of Sciences,Qinghai Provincial Key Laboratory Geology and Environment of Salt Lakes,Xining,Qinghai 810008,China;University of Chinese Academy of Sciences,Beijing 100049,China;Bureau of Geology Exploration and Development of Qinghai Province,Xining,Qinghai 810001,China;Qaidam Comprehensive Geological and Mineral Exploration Institute of Qinghai Province,Qinghai Provincial Key Laboratory of Exploration Research of Salt Lake Resources in Qaidam Basin,Golmud,Qinghai 816005,China)
出处
《地质学报》
EI
CAS
CSCD
北大核心
2021年第7期2129-2137,共9页
Acta Geologica Sinica
基金
第二次青藏高原综合科学考察研究(编号2019QZKK0805)
国家自然科学基金项目(编号41807216、41672087)
青海省基础研究计划项目(编号2019-ZJ-7004)
西部之光人才计划项目“柴达木盆地中部地区深层富钾硼锂卤水成因机制与资源潜力评价”资助的成果。
