[1] Penn State Univ, Dept Geosci, University Pk, PA 16802 USA
[2] Univ Chinese Acad Sci, Beijing 100049, Peoples R China
[3] CNOOC Res Inst Co Ltd, Beijing 100028, Peoples R China
[4] China Univ Min & Technol, CUMT UCASAL Joint Res Ctr Biomin & Soil Ecol Resto, State Key Lab Coal Resources & Safe Min, Xuzhou 221116, Peoples R China