Dating of sediment-hosted disseminated-type gold deposit by using ^40Ar/^39Ar laser probe:A case study of Changkeng large-scale gold deposit,China  

作　　者：SUNXiaoming CHENWen: WANGMin XUETing SUNKai CHENBinghui 

机构地区：[1]StateKeyLaboratoryofMineralDepositResearch,Nanjing210093,China [2]InstituteofGeologyandGeophysics,ChineseAcademyofSciences,Beiiing100101,China: [3]DepartmentofEarthSciences,SunYat-senUniversity,Guangzhou510275,China

出　　处：《Chinese Science Bulletin》2003年第17期1887-1891,共5页

基　　金：supported by the National Natural Science Foundation of China(Grant Nos.49773195,49502029 and 49928201);the Key Scientific and Technology Project from the Land and Resources Ministry of China(Grant No.200206);Trans—century Training Programme Foundation for the Talents from the Ministry of Education of China;Visiting Scholar Foundation of the State Key Laboratory of Mineral Deposit Research in Naniing University;the Visiting Scholar Foundation of Labs in Universities;also by the Lingnan Foundation of USA.

摘　　要：Hydrothermal clay minerals that formed in the main metallogenic stage of the Changkeng disseminated-type gold deposit in central Guangdong were analyzed by the 40Ar/39Ar laser probe. The results give Ar-Ar isochron ages of 109.9 1.4 to 110.1 1.3 Ma, which are 30 to 50 Ma older than the age of silver ore bodies in the deposit. Both gold and silver mineralizations were not related to hidden granite batholith in the mining district, but probably related to evo-lution of sedimentary basins. This study shows that the 40Ar/39Ar laser probe is a sound dating tool applicable to sediment-hosted disseminated-type gold deposit.Hydrothermal clay minerals that formed in the main metallogenic stage of the Changkeng disseminated-type gold deposit in central Guangdong were analyzed by the 40Ar/39Ar laser probe. The results give Ar-Ar isochron ages of 109.9 1.4 to 110.1 1.3 Ma, which are 30 to 50 Ma older than the age of silver ore bodies in the deposit. Both gold and silver mineralizations were not related to hidden granite batholith in the mining district, but probably related to evo-lution of sedimentary basins. This study shows that the 40Ar/39Ar laser probe is a sound dating tool applicable to sediment-hosted disseminated-type gold deposit.

关 键 词：中国 沉积散布型金矿床 ^40Ar/^39Ar激光探针 热液粘土矿物 年龄测定 

分 类 号：P618.51[天文地球—矿床学] P597.2[天文地球—地质学]