1. Department of Geology; University of Cincinnati; Cincinnati; Ohio; 45221-0013; USA
2. Centre de Recherche en Géochimie et en Géodynamique; Université du Quebec à Montréal; C.P. 8888, Succursale Centre-Ville,; Montreal, Quebec; Canada; H3C 3P8
3. Department of Earth Sciences; University of California; Riverside; California; 92521-0423; USA
4. Department of Geological Sciences; University of Kentucky; Lexington; Kentucky; 40506; USA
5. Institute of Geophysics; Vietnamese Academy of Science and Technology; Hanoi; Vietnam