[1] Nanjing Normal Univ, Coll Geog Sci, Nanjing 210046, Jiangsu, Peoples R China
[2] Nanjing Museum, Nanjing 210016, Jiangsu, Peoples R China
[3] US Geol Survey, Menlo Pk, CA 94025 USA
[4] Univ Queensland, Ctr Microscopy & Microanal, Radiogenic Isotope Lab, Brisbane, Qld 4072, Australia