莱州湾南岸卤水的稳定同位素与地球化学特征  

Hydrogeochemical and Stable Isotopic Characteristics of Brine in Laizhou Bay

作　　者：杨巧凤[1,2] 王瑞久[3] 徐素宁[3] 李文鹏[4] 王志一[3] 梅军军[3] 丁志磊[1] 杨培杰 

机构地区：[1]中国地质大学(北京),北京100083 [2]北京市水文地质工程地质大队,北京100195 [3]中国地质环境监测院,北京100081 [4]中国地质调查局水文地质环境地质调查中心,河北保定071051 [5]山东省地质环境监测总站,济南250014

出　　处：《地质论评》2016年第2期343-352,共10页Geological Review

基　　金：国家公益性行业科研专项(编号:201011019)的成果~~

摘　　要：莱州湾南岸卤水的开发利用始于20世纪50年代,如今卤水的含盐量比海水高出3～6倍。本文采用稳定同位素和水化学分析来鉴定卤水的盐分来源,为此在研究区内采集了9件卤水样品,采样井深度为30～80m。首先根据同位素盐效应,对卤水的δD和δ^(18)O值进行了校正。校正后的δD和δ^(18)O值关系图表明卤水的水分子来源于大气降水,而不是海水。δ^(18)O—Cl^-和Br^-—Cl^-关系表明卤水的盐分不同于海水蒸发的余留水。根据化学分水岭原理,卤水的Ca^(2+)/SO_(-4)~2和Ca^(2+)/Mg^(2+)值演化提示溶解盐起源不是蒸发的海水卤水。其它化学成分关系也证实了卤水的盐分源于海水蒸发盐的反复溶解。本研究说明卤水样品与海水盐分有关,但是与海水的水分子无关。The development of brine on the coast of Laizhou Bay began at 1950s, where the present salinity of brine is 3～6 times that of the seawater. To identify the origin of salinity, stable isotopic and hydrochemical analyses have been performed on 9 samples collected in this study. The depth of sampling well fall in the range 30～80 m. According to the isotope salt effect, the values of δD and δ^18O were corrected to the activity values. δD—δ^18O diagram indicates that the water molecule of brine samples are originated from meteoric water rather than seawater. δ^18O—Cl^- and Br^-—Cl^- diagrams show that the salinity feature of brine was different from that of the residual evaporated marine water. Base on the chemical divide concept, the evolution of Ca^2＋/SO4^2- and Ca^2＋/Mg^2＋ratios of brine suggests that the origin of the dissolved salts is not evaporated marine brine. Reactive tracers plots identify that the brine salinity was attributed to the repetitious dissolution of evaporite derived from marine salts. This paper suggests the brine is related to marine salt rather than marine water.

关 键 词：卤水 莱州湾南岸 稳定同位素 地球化学 

分 类 号：TS311[轻工技术与工程]