Actualities and problems of 40 |Ar/39 〗Ar thermochronology
Wu Lin1,2 Yang Liekun1 Shi Wenbei3 Wang Fei1
(1.State Key Laboratory of Lithospheric Evolution| Institute of Geology and Geophysics| Chinese Academy of Science|Beijing 100029； 2.Graduate University of Chinese Academy of Science| Beijing 100049； 3.China University of Geosciences(Beijing)| Beijing 100083）
40 Ar/39 Ar thermochronology has been one of the most powerful tools for researching thermal history of geological body owing to the fact that， for Ar isotopic system， closure temperatures of minerals for dating spread a wide range and that nonlinear cooling history between 650 and 150 ℃ could be obtained. However， some problems with respect to the mechanisms for argon diffusion in these minerals have not been completely understood which restricts the development of 40 Ar/39 Ar thermochronology to a certain extent. Two most widely used models， multiple diffusion domain model and multipath diffusion model， will be introduced here， including their actualities， problems and possible solution， and the trend of 40 Ar/39 Ar thermochronology.