On emplacement ages of lam-proites in Zhenyuan County,Guizhou Province,China  

作　　者：Weixuan Fang Ruizhong Hu Wenchao Su Jiafei Xiao Liang Qi Guohao Jiang 

机构地区：[1]Chinese Acad Sci, Inst Geochem, Lab Ore Deposit Geochem, Guiyang 550002, Peoples R China

出　　处：《Chinese Science Bulletin》2002年第10期874-880,共7页

基　　金：This work was jointly supported by the National Outstanding Young Scientist Foundation of China (Grant No. 49925309); the State Key Project of Fundamental Research Planning (Grants No. 1999043200); and 95-Y-25.

摘　　要：Emplacement ages of lamproites that comprise lamproite and olivine lamproite in Zhenyuan County, Guizhou Province, China, have been constrained by the whole-rock Sm-Nd and Rb-Sr isochron methods and the whole rock K-Ar method. Intrusive activities of lamproites in the Sinantang area of Zhenyuan County, Guizhou Province, took place during the Late Cambrian, as indicated by the Sm-Nd isochron ages (t) = (503±17) (2σ) Ma and by the Rb-Sr isochron ages (t) = (501.2±4.6) (2σ) Ma. Intrusive activities of olivine lamproites at the Maping with Ⅱ -type diamond and Xitou in Zhenyuan County, Guizhou Province, took place from the Late Cambrian to the Early Ordovician, as evidenced by the Sm-Nd isochron ages (t) = (502±27) (2σ) Ma and by the Rb-Sr isochron age (t) = (502± 27) (2σ) Ma. This suggests that the upwelling hot materials derived from the deep mantle were emplaced from the Late Cambrian to the Early Ordovician (503-497 Ma), while the time terminal of cooling of the geothermal event ofEmplacement ages of lamproites that comprise lamproite and olivine lamproite in Zhenyuan County, Guizhou Province, China, have been constrained by the whole-rock Sm-Nd and Rb-Sr isochron methods and the whole rock K-Ar method. Intrusive activities of lamproites in the Sinantang area of Zhenyuan County, Guizhou Province, took place during the Late Cambrian, as indicated by the Sm-Nd isochron ages (t) = (503±17) (2σ) Ma and by the Rb-Sr isochron ages (t) = (501.2±4.6) (2σ) Ma. Intrusive activities of olivine lamproites at the Maping with II-type diamond and Xitou in Zhenyuan County, Guizhou Province, took place from the Late Cambrian to the Early Ordovician, as evidenced by the Sm-Nd isochron ages (t) = (502±27) (2σ) Ma and by the Rb-Sr isochron age (t) = (502±27) (2σ) Ma. This suggests that the upwelling hot materials derived from the deep mantle were emplaced from the Late Cambrian to the Early Ordovician (503–497 Ma), while the time terminal of cooling of the geothermal event of magmatism-tectonism probably was at 442.64–435.54 Ma, as dated by the whole rock K-Ar method.

关 键 词：the SM-ND ISOCHRON age the RB-SR ISOCHRON age whole rock K-AR method LAMPROITE Zhenyuan COUNTY of Guizhou Prov-ince China. 

分 类 号：P595[天文地球—地球化学]