反向地球化学模拟技术在深层地下水^(14)C年龄校正中的应用——以鄂尔多斯白垩系盆地典型水流路径为例  

Application of Inverse Geochemical Modeling in ^(14)C Age Correction of Deep Groundwater: A Case in the Ordos Cretaceous Artesian Basin

作　　者：董维红[1,2] 苏小四[1,2] 侯光才[1,2,3] 林学钰[1,2] 柳富田[1,2] 

机构地区：[1]吉林大学环境与资源学院,吉林长春130026 [2]吉林大学水资源与环境研究所,吉林长春130026 [3]西安地质矿产研究所,中国西安710054

出　　处：《水文》2008年第5期43-47,共5页Journal of China Hydrology

基　　金：中国国土资源大调查鄂尔多斯盆地地下水勘查计划项目(1212010331302);教育部博士点基金项目(20030027020);吉林大学"985"计划;吉林省水资源与水环境重点实验室(原地质矿产部水资源评价与管理系列模型开放研究实验)资助

摘　　要：本文以鄂尔多斯白垩系地下水盆地为例,利用反向水文地球化学模拟技术识别出影响区内深层地下水碳酸演化的主要作用并进行深层地下水14C年龄的校正。结果表明:控制鄂尔多斯白垩系地下水盆地南区深层地下水化学演化的主要反应路径为碳酸盐矿物、伊利石或绿泥石的沉淀反应、长石、石膏矿物等的溶解以及Ca-Na的离子交换;北区为方解石溶解、白云石沉淀的非全等溶解反应、伊利石的沉淀反应、长石的溶解反应以及Ca-Na的离子交换。南区地下水流路径上所发生的水文地球化学反应对路径上14C的浓度变化影响较小而北区影响较大。地下水14C年龄校正结果表明,盆地南区深层地下水14C年龄(22969a)明显老于北区(3967a)。The Ordos Cretaceous Artesian Basin has been taken as case study, the factors affecting the variation of 14C activity in the process of formation of dissolved inorganic carbon and its evolution have been identified and the 14C age of deep groundwater have been corrected by using the inverse geochemical modeling method in this paper. The simulation result shows that the main reactions controlling the geochemical evolution of deep groundwater from the initial point to the final point in the groundwater flow path in the south of the basin are the precipitation of carbonate minerals, illite or chlorite, the dissolution of plagioclase, gypsym, and Ca-Na exchange while the precipitation of dolomite, illite, the dissolution of calcite, plagioclase and Ca-Na exchange in the north of the basin. The above reactions have little effect on the transferring time in the groundwater flow path in the south basin while large effect in the north basin. 14C correction result shows that the 14C age of deep groundwater in the south basin is older than that in the north.

关 键 词：反向地球化学模拟 14C年龄校正 深层地下水 鄂尔多斯 

分 类 号：P641.3[天文地球—地质矿产勘探]