Geochemical characteristics of hadal sediment in the northern Yap Trench  

作　　者：HUANG Yuhuan SUN Chengjun YANG Guipeng YUE Xin’an JIANG Fenghua CAO Wei YIN Xiaofei GUO Chaonan NIU Jiaohong DING Haibing 

机构地区：[1]Key Laboratory of Marine Chemistry Theory and Technology/Ministry of Education,Ocean University of China,Qingdao 266100,China [2]Key Laboratory of Marine Eco-environmental Science and Technology,Marine Bioresource and Environment Research Center,First Institute of Oceanography,Ministry of Natural Resources,Qingdao 266061,China [3]College of Chemistry and Chemical Engineering,Ocean University of China,Qingdao 266100,China [4]Marine Ecology and Environmental Science Laboratory,Pilot National Laboratory for Marine Science and Technology,Qingdao 266237,China [5]Qingdao Collaborative Innovation Center of Marine Science and Technology,Qingdao 266100,China [6]South China Sea Environment Monitoring Center,State Oceanic Administration,Guangzhou 510300,China

出　　处：《Journal of Oceanology and Limnology》2020年第3期650-664,共15页海洋湖沼学报（英文）

基　　金：Supported by the National Basic Research Program of China(973 Program)(No.2015CB755904);the National Natural Science Foundation of China(No.41676067);the Fundamental Funds for Central Universities,China(No.201762030);the Overseas Expertise Introduction Project for Discipline Innovation(111 Project)(No.B13030)。

摘　　要：Two sediment cores were retrieved in the hadal zone of the Yap Trench,and their concentrations of six major elements Mg,Al,Ca,Ti,Mn and Fe and nine trace elements Sr,Ba,Pb,V,Cr,Co,Ni,Cu and Zn were determined in inductively coupled plasma atomic emission spectrometry(ICP-AES).According to the vertical distribution profiles of the 15 elements,the correlation of their concentrations,the ratios of Ni/Co,V/Cr,Fe/Al,and Ti/Al,and morphological characteristics of the sediment samples,the implications of the depositional environment and the sediment provenance were analyzed.The results show that the ratio of Ni/Co in all depths of the two sediment cores were below 5,and the ratio of V/Cr were lower than 2,indicating that the depositional environment of the hadal zone in the trench was oxidative and might have inflow of the Antarctic bottom oxygen-rich water.The sediment samples on the eastern side of the trench were siliceous mud mainly composed of diatoms,radiolarian,and sponge needles from surface to deep layer.The vertical profile of the elements,the concentration of TOC and the fossil record indicated that the sediment sample from station Dive113 was well mixed from surface to bottom layer.Based on the correlation of concentrations of the elements,the morphological characteristics of the sediment,and the ratios of Fe/Al and Ti/Al,we inferred that the sediment in the hadal zone of the trench had terrestrial,volcanic,biological,and authigenic sources.Major source of the sediment in the eastern side of the trench were terrestrial;whereas the sediment in the western side of the trench received more volcaniclastic input.

关 键 词：Yap TRENCH hadal zone Jiaolong SUBMERSIBLE SEDIMENT metal elements SEDIMENTARY environment 

分 类 号：P736.41[天文地球—海洋地质]