*Ru-Yun Tung¹、Pierrick Fenies¹、Masanobu Yamamoto²、Jens Hefter³、Yoshimi Kubota⁴、Chuan-Chou Shen^5,6、Sze Ling Ho¹ (1.Institute of Oceanography, National Taiwan University, Taiwan、2.Graduate School of Earth and Environmental Science, Hokkaido University, Japan、3.Alfred Wegener Institute, Helmholtz Center for Polar and Marine Research, Germany、4.Department of Geology and Paleontology, National Museum of Nature and Science, Japan、5.High-Precision Mass Spectrometry and Environment Change Laboratory (HISPEC), Department of Geosciences, National Taiwan University, Taiwan、6.Research Center for Future Earth, National Taiwan University, Taiwan)