1. Faculty of Geosciences and Geoengineering; Hanoi University of Mining and Geology; Duc Thang, Bac Tu Lient Hanoi Vietnam
2. Department of Earth System Sciences; Yonsei University; 50 Yonsei-ro Seoul 120-749 Republic of Korea
3. Japan Geochronology Network (NPO); 2-5 Nakashima, Naka-ku Okayama 703-8252 Japan
4. Hiruzen Institute for Geology and Chronology, Co., Ltd.; 2-5 Nakashima, Nakaku Okayama 703-8252 Japan