Helium Isotope Evidence of Mantle Degassing in Rift Valley, Eastern China  

作　　者：杜建国 

机构地区：[1]State Key Laboratory of Gas-geochemistry, Lanzhou Institute of Geology, Academia Sinica, Lanzhou 730000, PRC

出　　处：《Chinese Science Bulletin》1994年第12期1021-1024,共4页

基　　金：Project (0488013) supported by the National Natural Science Foundation of China.

摘　　要：Radiogenic ⁴⁰Ar and ⁴He found in atmosphere are considered to be produced byradioactive elements（e. g. U, Th）in the inner earth. Isotope composition of no-ble gases and ratios of their components are important geochemical indicators for thetheory of earth degassing and geochemical evolution of the mantle. The continuousand 'catastrophic' models of earth degassing have been suggested. The mantledegassing would be actually 'catastrophic' during geohistory and heterogeneous in dif-

关 键 词：MANTLE DEGASSING HELIUM ISOTOPE RIFT VALLEY China. 

分 类 号：P597[天文地球—地球化学]