The geochemical characteristics and sedimentary environment of abyss and hadal sediments of Yap-trench

Yuhuan Huang1, Mengqi Wang1, ChengJun Sun2, Guipeng Yang1 and Haibing Ding1, (1)Ocean University of China, Qingdao, China, (2)First Institute of Oceanography, State Oceanic Administration, Qingdao, China