Key Laboratory of Deep-Earth Dynamics of Ministry of Natural Resources;
Laboratory of Isotope Thermochronology;
Institute of Geology;
Chinese Academy of Geological Sciences;
Beijing 100037;
China;
Xi’an Center;
China Geological Survey;
Xi’an 710054;
China;
College of Geoscience and Surveying Engineering;
China University of Mining and Technology;
Beijing 100083;
China;
Lancaster Environment Centre;
Lancaster University;
Lancaster;
LA14YQ;
UK;
granite; helium; source; rock; helium; diffusivity; crushing; stepwise; heating;