Analysis of the redox environment and genesis of surface sediment in the northeast Indian Ocean at the Ninety-East Ridge  

作　　者：Zhourong CAI Qianru HUANG Zhengxin YIN Xin SUI Sibo LÜ Meng TANG Juan PENG 

机构地区：[1]School of Marine Sciences,Sun Yat-sen University,Zhuhai 519082,China [2]Guangdong Provincial Key Laboratory of Marine Resources and Coastal Engineering,Zhuhai 519082,China [3]South China Sea Marine Survey Center,Ministry of Natural Resources,Guangzhou 510275,China [4]Key Laboratory of Marine Environmental Survey Technology and Application,Ministry of Natural Resources,Guangzhou 510275,China

出　　处：《Journal of Oceanology and Limnology》2025年第1期57-72,共16页海洋湖沼学报(英文)

基　　金：Supported by the Science and Technology Development Foundation of South China Sea Bureau,Ministry of Natural Resources,China(No.230204);the National Program on Global Change and Air-Sea Interaction(No.GASI-02-IND-CJ04);the Natural Science Foundation of Guangdong Province,China(No.2021A1515012589);the Key Technologies Research and Development Program of Guangzhou,Guangdong Province,China(No.2023B03J1379)。

摘　　要：The Ninety-East Ridge(NER)is located in the semioceanic to oceanic region of the southern Bengal Fan in the Northeast Indian Ocean.The sedimentary environment,ocean currents,and scientific issues related to climate change have always been the focus of scientists.To well understand the sedimentary environment of the sea area,we studied the modern sedimentary environment of the NER by analyzing the redox-sensitive trace elements(RSEs)and biomarkers in the surface sediments of the northern region and both sides of the NER and the mechanism of their formation.The ratios of Mo/U(average 2.22),(Cu+Mo)/Zn(average 1.51),and the results ofδCe<1 of the sediment samples,all indicate the reduction of the sedimentary environment.In addition,the ratio of pristane(Pr)to phytane(Ph),C30diahopane to C30 hopane,and diasterane to sterane were low in all samples,on average of 1.03,0.9,and 0.33,respectively.The analysis of RSE and biomarker data revealed that the sedimentary environment on seabed of the NER is generally a rare low-oxygen reduction environment.Through the analysis of sediment characteristics,material sources,and ocean currents,we preliminarily constructed a genetic model for the low-oxygen reducing environment of surface sediments in the NER.We believe that the low-oxygen reduction environment of surface sediment in the NER could be influenced by multiple factors,such as terrestrial input of materials,productivity at sea surface,and sediment particle size.

关 键 词：Ninety-East Ridge(NER) surface sediment sedimentary environment redox-sensitive trace elements(RSEs) biomarker 

分 类 号：P736.21[天文地球—海洋地质]