Submarine Topography of the Central Part of Lutzow-Holm Bay and around Ongle Islands, Antarctica

• Main Author: Kiichi Moriwaki
• Format: Report
• Language: English
• Published: National Institute of Polar Research 1979
• Subjects: Ongul; Shirase Glacier; Gunnerus Bank; Telen; Honnor Glacier; Telen Glacier; Antarc*; Antarctica; Ice Sheet; Memoirs of National Institute of Polar Research; Polar Research
• Online Access: https://nipr.repo.nii.ac.jp/?action=repository_uri&item_id=1033; http://id.nii.ac.jp/1291/00001033/; https://nipr.repo.nii.ac.jp/?action=repository_action_common_download&item_id=1033&item_no=1&attribute_id=18&file_no=1

The drowned glacial trough formed when the ice sheet expanded in the past exists in the central part of Lutzow-Holm Bay. The trough extends north-south and joins the drowned glacial troughs off the Honnor Glacier and off the Telen Glacier, and also joins the Shirase Glacier probably. This trough suggests the existence of a major geologic structural zone which seems to extend from the Shirase Glacier to the eastern margin of Gunnerus Bank. The continental shelf west of the trough is 200-300m deeper than that east of the trough. The submarine topography around the Ongul Islands also reflects the geologic structure. The trends of geomorphic features fit the foliation and jointing of gneissic basement rocks. Preglacial landform in the vicinity of the Ongul Islands had been gentle in relief like a peneplain. It was glaciated during a period of expansion of the ice sheet and was divided into several islands.