Origin of submarine canyon-channel systems along the middle segment of West Mariana Ridge,Philippine Sea  

作　　者：Guangxu ZHANG Shuang LI Wei LI Xiujuan WANG Duanxin CHEN Dongdong DONG Wenlong WANG 

机构地区：[1]Key Laboratory of Marine Geology and Environment&Center for Ocean Mega-Science,Institute of Oceanology,Chinese Academy of Sciences,Qingdao 266071,China [2]Laboratory for Marine Mineral Resources,National Laboratory for Marine Science and Technology,Qingdao 266071,China [3]University of Chinese Academy of Sciences,Beijing 100049,China [4]CAS Key Laboratory of Ocean and Marginal Sea Geology,South China Sea Institute of Oceanology,Chinese Academy of Sciences,Guangzhou 510301,China [5]Frontiers Science Center for Deep Ocean Multispheres and Earth System,Key Lab of Submarine Geosciences and Prospecting Techniques,MOE and College of Marine Geosciences,Ocean University of China,Qingdao 266100,China

出　　处：《Journal of Oceanology and Limnology》2023年第3期881-896,共16页海洋湖沼学报（英文）

基　　金：Supported by the National Natural Science Foundation of China(No.91958211);the Strategic Priority Research Program of the Chinese Academy of Sciences(No.XDB42020000);the Laoshan Laboratory Project(No.LSKJ202203503);the Key Deployment Project of Center for Ocean Mega-Research of Science,Chinese Academy of Sciences(No.COMS2019Q10).Dr.Wei LI is funded by the CAS Pioneer Hundred-Talents Program。

摘　　要：Submarine canyon-channel systems have been documented in the Parece Vela Basin,West Mariana Ridge;however,the mechanism of the formation and controlling factors remain poorly understood.Based on high-resolution multibeam bathymetric data and two-dimensional(2D)seismic profiles,we identified and mapped the submarine canyon-channel system along the middle segment of West Mariana Ridge in the Philippine Sea.These submarine canyon-channels show a main W-E orientation at depth of 2000–4500 m.They are approximately 72–128 km in length and 1.3–15 km in width,and their canyon heads are adjacent to the seamounts with several branches.The upper reaches of submarine canyon-channels are characterized by deeply incised,narrow,V-shaped thalwegs,suggesting the powerful erosion of gravity flows.The distinguished sediment waves are suggested to be resulted from the interaction of turbidity currents and seafloor.Our observations demonstrate that gravity flows originated from the collapses of seamount flanks plays a vital role in developing the submarine canyonchannel system along the West Mariana Ridge.This work provides better understanding of erosion,transport,and deposition of sediments from subducting ridges to deep-water basins,and also new insights into the origin and evolution of submarine canyon-channel systems along subducting ridges.

关 键 词：submarine canyon-channel system gravity flow subducting ridges West Mariana Ridge 

分 类 号：P736[天文地球—海洋地质]