Glacial bedforms in the Northwind Abyssal Plain,Chukchi Borderland  

作　　者：Zhongyan Shen Tao Zhang Jinyao Gao Chunguo Yang Qingsheng Guan 

机构地区：[1]Key Laboratory of Submarine Geosciences,Ministry of Natural Resources,Hangzhou 310012,China [2]Second Institute of Oceanography,Ministry of Natural Resources,Hangzhou 310012,China [3]School of Geographic and Oceanographic Sciences,Nanjing University,Nanjing 210023,China

出　　处：《Acta Oceanologica Sinica》2021年第5期114-119,共6页海洋学报（英文版）

基　　金：The National Natural Science Foundation of China under contract No.41976079;the Chinese Polar Environment Comprehensive Investigation and Assessment Programmes under contract No.CHINARE-03-03。

摘　　要：A series of sub-parallel linear glacial scours are identified on the crest of the Baoshi Seamount in the Northwind Abyssal Plain by compiling new multibeam data acquired during the 9 th Chinese Arctic Research Expedition(CHINARE-Arc9)in 2018 and previously published data.The new data reveal scours that developed at water depths of 850–1030 m with an orientation of about 75°/255°.The maximum water depth occurs in the southernmost scour and is deeper than that from previous investigations,which showed a maximum scouring depth of about 900 m on the seamount.The topographic and geomorphological characteristics suggest that these scours resulted from erosion by the ice shelf extending from the Chukchi margin and/or Laurentide Ice Sheet that grounded on the crest of the seamount and moved in a NE–SW direction.Other possibilities of their genesis include armadas of large icebergs/multi-keel icebergs calved from the Chukchi Shelf or the Laurentide Ice Sheet.The new data provide new constraints for assessing the extent and volume of the ice sheet in the Chukchi area during glacial maxima.

关 键 词：Chukchi Borderland Northwind Abyssal Plain glacial bedforms mega-scale glacial lineations ice shelf 

分 类 号：P343.6[天文地球—水文科学]