1. Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences and Gansu Provincial Key Laboratory of Petroleum Resources, Lanzhou, Gansu 730000, People’s Republic of China
2. School of Earth Science & Resources, Chang’an University, Xi’an, Shaanxi 710054, People’s Republic of China
3. Shaanxi Center of Mineral Geological Survey, Xi’an, Shaanxi 710068, People’s Republic of China