class=MsoNormal><SPAN style="FONT-FAMILY: Verdana; COLOR: black; FONT-SIZE: 10pt" lang=EN-US>Actualities and Problems of 40Ar/39Ar Thermochronology
class=MsoNormal><SPAN style="FONT-SIZE: 14pt" lang=EN-US>40Ar/39Ar 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 non-linear cooling history between 650 ℃ and