首页|Genesis and geological significance of carbonate in Changdu Basin,Xizang,China:Constraints from geochemistry and C-O isotopes
Genesis and geological significance of carbonate in Changdu Basin,Xizang,China:Constraints from geochemistry and C-O isotopes
扫码查看
点击上方二维码区域，可以放大扫码查看
原文链接
万方数据
维普
Genesis and geological significance of carbonate in Changdu Basin,Xizang,China:Constraints from geochemistry and C-O isotopes
Research on the origin of carbonates in Changdu Basin holds significant importance for understanding the regional potash formation model.Based on a comprehen-sive review of previous studies,field geological surveys,and laboratory investigations,this study analyzes the origin and properties of carbonates within the context of regional potash formation.Petrographic studies show that magne-site deposits,with the characteristics of sedimentary origin.The results of elemental geochemical analysis show that the carbonates in this area were formed in the sedimentary envi-ronment via evaporation followed by concentration,and the formation of magnesite was possibly caused by the substitu-tion of calcium in the dolomite with magnesium-rich brine.The δ13C values of carbonats in the study area are between 5.9‰ and 9.1‰.The δ18O values of magnesite samples range from-7.3‰ to-1.3‰,and the δ18O values of dolo-mites range from-10.3‰ to-8.4‰.All the calculated Z values of oxygen isotopes of carbonates greater than 120.A comprehensive analysis of carbon and oxygen isotopes indi-cates that the magnesite was formed in a highly concentrated Marine sedimentary environment and does not show any relation with the metasomatism of hydrothermal fluids.The results on the correlation of magnesite with seawater and its sedimentary origin provide key information for explaining the migration direction of brine between the Changdu and Lanping-Simao Basins.The residual metamorphic seawater in the Changdu Basin migrated to the Lanping-Simao Basin,where potash underwent deposition.Whereas,magnesite and dolomite in the early stage of potash formation were left in the Changdu Basin.
Changdu basinCarbonatiteGeochemistryMineral deposit genesisSignificance of potash formation
Wenhua Han、Yongshou Li、Haizhou Ma、Huaide Cheng、Binkai Li、Qinyu Hai、Xuahai Ma
展开 >
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
Changdu basin Carbonatite Geochemistry Mineral deposit genesis Significance of potash formation
万方数据
维普
