XIU Qunye ),YU Haifeng ),LI Quan ),ZUO Guochao ),LI Jinwen ),CAO Chengjie ) ) Institute of mineral Resources, Chinese Academy of Geological Sciences, Beijing, ) Tianjin Institute of Geology, Mineral Resources, ) Geological Surveying Institute of Gansu Province, Lanzhou, ) Institute of Geomechanics, Chinese Academy of Geological Sciences, Beijing,.2004. Discussion on the Petrogenic Time of Longshoushan Group, Gansu Province[J]. Acta Geologica Sinica,78(3):366-373
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