A geophysical study of the Ross Sea, Antarctica

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doi: 10.2973/dsdp.proc.28.127.1975
Author(s): Hayes, D. E.; Davey, F. J.
Author Affiliation(s): Primary:
Lamont-Doherty Geol. Obs., Palisades, N. Y., United States
Volume Title: Initial Reports of the Deep Sea Drilling Project
Source: Initial Reports of the Deep Sea Drilling Project, Vol.28, p.887-907. Publisher: Texas A & M University, Ocean Drilling Program, College Station, TX, United States. ISSN: 0080-8334 CODEN: IDSDA6
Note: In English. Data from USNS Eltanin, but included with DSDP Leg 28 reports. Color bathym. map ; Lamont-Doherty Contr. No. 2151; illus. incl. sketch maps
Summary: New bathymetric, gravity, and magnetic data in the Ross Sea are presented. The bathymetric data show that the entire Ross Sea continental shelf has a mean depth of about 500 metres with the eastern half systematically deeper than the western half. Subdued ridges and valleys characterize the relief of the shelf and trend roughly north-south east of the 18° meridian and northeast-southwest west of it. These features appear to be primarily the result of erosion by past movement of a partially grounded Ross Ice Shelf. The continental slope is tectonically complex especially to the west of Iselin Bank. The most dramatic geophysical feature of the Ross Sea shelf is the linear positive gravity anomaly belt trending north-south across the western Ross Sea. This positive gravity belt is about 700 km long, 50 to 100 km wide, and has an amplitude of up to 80 mgal. We interpret it as marking the position of an ancient rift, probably active during the separation of Australia and New Zealand from Australia. The major sedimentary basin underlying the eastern Ross Sea is not marked by any significant local or regional gravity anomalies and probably contains highly compacted sediments. Large magnetic anomalies over the Ross Sea are few and these are local in extent.
Year of Publication: 1975
Research Program: DSDP Deep Sea Drilling Project
Key Words: 07 Marine Geology and Oceanography; Acoustical methods; Antarctic Ocean; Antarctica; Bathymetric; Bottom features; Buried; Color bathym. map; Continental shelf; Deep Sea Drilling Project; Faults; Fractures; Geophysical methods; Geophysical surveys; Grabens; Gravity anomalies; Gravity methods; Iselin Bank; Leg 28; Magnetic anomalies; Magnetic methods; Maps; Marine; Marine geology; Paleogeography; Ross Sea; Sentinel Mountains; South; Southern Ocean; Structure; Submarine; Surveys; Tectonics; Topography; Transantarctic Mountains
Record ID: 1976003222
Copyright Information: GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data supplied by Institute of Geological and Nuclear Sciences Limited (GNS Science), Lower Hutt, New Zealand

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