1. Department of Geology and Geophysics, E235 Howe-Russell Geoscience Complex; Louisiana State University; Baton Rouge Louisiana USA
2. Department of Chemistry and Biochemistry; University of California San Diego; California USA
3. Department of Geosciences; University of Nebraska Lincoln; Lincoln Nebraska USA
4. Nanjing Institute of Geology and Palaeontology; Academia Sinica; Nanjing People's Republic of China