鄂尔多斯白垩系盆地地下水水-岩反应的锶同位素证据  

Groundwater-Rock Interaction in the Ordos Cretaceous Groundwater Basin:Strontium Isotope Evidence

作　　者：董维红[1] 苏小四[1] 谢渊[2] 侯光才[3] 柳富田[4] 

机构地区：[1]吉林大学环境与资源学院/水资源与环境研究所,长春130026 [2]成都地质矿产研究所,四川610081 [3]西安地质矿产研究所,西安710054 [4]天津地质调查中心,天津300170

出　　处：《吉林大学学报（地球科学版）》2010年第2期342-348,共7页Journal of Jilin University：Earth Science Edition

基　　金：国家自然科学基金项目(40872085);中国国土资源大调查项目(1212010331302);吉林大学985计划项目;2008年吉林大学种子基金项目(421020390425);吉林大学科学前沿与交叉学科创新项目(421031704425)

摘　　要：利用鄂尔多斯白垩系盆地地下水锶同位素和水化学资料,对该区水-岩作用机制进行了分析,并采用反向水文地球化学模拟的方法对锶同位素示踪水-岩反应的分析结论进行了验证。结果表明:研究区主要发生了石膏、少量碳酸盐矿物及铝硅酸盐矿物的溶解反应,且北区地下水对石膏等硫酸盐矿物的溶滤作用强于南区,而南区地下水对铝硅酸盐矿物的溶滤作用强于北区;同时,南区碳酸盐矿物发生了溶解/沉淀的不一致性,即白云石发生溶解反应而方解石发生沉淀反应。采用锶同位素方法得出的水-岩作用结论与反向水文地球化学模拟结果相一致。The mechanism of groundwater-rock interaction in Ordos Creatceous basin has been studied by Strontium isotopic method and hydrochemical analyis,which has been validated by inverse hydrogeochemical modeling.The results show that the main water-rock reactions in Ordos Cretaceous basin are the dissolution of gypsym,minor carbonate minerals and alluminate-silicate minerals and the the dissolution extent of sulfate minerals such as gypsum in northern basin is higher than that in southern basin,but the the dissolution extent of allumi-silicate minerals in southern basin is higher than that in northern basin.Meanwhile,the uncongruent dissolution of carbonate mimerals,i.e,the dissolution of golomite and the precipitation of calcite occurs in sothern basin.The water-rock interaction deduced by the strontium isotope is in accordance with the inverse hydrogeochemival modeling results.

关 键 词：水-岩作用 锶同位素 地下水 鄂尔多斯白垩系盆地 

分 类 号：P641.8[天文地球—地质矿产勘探]