摘要
新疆库米什盆地是典型的硝酸盐型盐湖分布区,盆内盐湖中Sr2+的含量明显比新疆其他盐湖要高,但对该地区盐湖中Sr2+的迁移富集规律尚未开展深入研究。本文以库米什盆地硝酸盐型盐湖为研究对象,探讨了研究区硝酸盐型盐湖中Sr2+的迁移富集规律。研究结果表明:①库米什盆地水体和沉积物中的Sr2+均具有自北西至南东向逐渐迁移富集的规律,与河水汇聚方向基本一致,表明盐湖中的Sr2+主要随径流逐渐汇集至成盐凹陷中;②无论是水体还是沉积物中,Sr2+与Ca2+、SO24-等化学组分之间均具有较好的相关性和变化趋势上的一致性,受它们物质补给源的影响较大。盐湖水体在蒸发浓缩作用下,其矿化度逐渐增高,Sr2+含量也随之升高,表明Sr2+的富集与蒸发浓缩作用过程有关;③库米什盆地硝酸盐型盐湖中Sr2+的补给源与盆地北西部的天青石矿床、北东部及北西部的碳酸盐岩(以泥盆系灰岩为主)、盆缘的侵入岩有关。综合分析表明,库米什盆地硝酸盐型盐湖中Sr2+的迁移富集具有多源、多方向补给的特征。
Representative nitrate type salt lakes are distributed in the Kumishi Basin in Xinjiang. The concentration of Sr2+in the basin salt lakes is higher than that of other salt lakes in Xinjiang,but the migration and enrichment regularity of strontium ions in the salt lakes in the study area requires further investigation. In this paper,the research object is the content of strontium ions in nitrate salt lakes. The migration and enrichment regularity of strontium ions in nitrate typical salt lakes in the study area is discussed. The results are as follows: ① Concentrations of Sr2+tend to be enriched from northwest to southeast in the water bodies and sediments of the Kumishi Basin,consistent with the converging direction of the river. It is shown that Sr2+of the salt lakes is mainly concentrated in the salt formation depression along with the river water( including groundwater);② Regardless of water bodies or sediments,the variation trend of Sr2+is consistent with that of K+and Ca2+,NO3-,SO24-in chemical composition nitrate-type salt lakes. It is greatly affected by the material supply source of chemical components. Under the action of evaporation and concentration,the salinity of salt lake water bodies gradually increases,and the content of Sr2+also increases. It is shown that the enrichment of Sr2+is related to evaporation and concentration processes;③ Main replenishment source of Sr2+is the celestite deposit in the northwest and carbonate rocks( mainly Devonian limestone) and strontium-rich intrusive rocks in the northeast and northwest of nitrate-type salt lakes in the Kumishi Basin. Comprehensive analysis shows that migration and enrichment of strontium ions have the characteristics of multisource and multi-directional replenishment.
作者
李长忠
程怀德
张西营
宋建国
马学海
蒋天明
李俊
海擎宇
LI Chang-zhong;CHENG Huai-de;ZHANG Xi-ying;SONG Jian-guo;MA Xue-hai;JIANG Tian-ming;LI Jun;HAI Qing-yu(Key Laboratory of Comprehensive and Highly Efficient Utilization of Salt Lake Resources,Qinghai Institute of Salt Lakes,Chinese Academy of Sciences,Xining 810008,China;Qinghai Provincial Key Laboratory of Geology and Environment of Salt Lakes,Xining 810008,China;University of Chinese Academy of Sciences,Beijing 100049,China)
出处
《岩石矿物学杂志》
CAS
CSCD
北大核心
2021年第1期89-98,共10页
Acta Petrologica et Mineralogica
基金
西北研究院“一三五”重点培育项目(Y760031090)
科技部专项项目(2012FY112600)。
关键词
新疆库米什盆地
硝酸盐型盐湖
锶离子
迁移规律
Kumishi Basin
Xinjiang
nitrate type salt lakes
strontium ions
migration regularity
