Geology and structure of the Ross Sea region

Author(s): Davey, Frederick J.
Author Affiliation(s): Primary:
Dep. Sci. and Ind. Res., Wellington, New Zealand
Other:
Dep. Sci. and Ind. Res., New Zealand
Volume Title: Antarctic continental margin; geology and geophysics of the western Ross Sea
Volume Author(s): Cooper, Alan K., editor; Davey, Frederick J.
Source: The Antarctic continental margin; geology and geophysics of the western Ross Sea, edited by Alan K. Cooper and Frederick J. Davey. Earth Science Series, Vol.(5B), p.1-15. Publisher: Circum-Pacific Council for Energy and Mineral Resources, Houston, TX, United States. ISSN: 1068-6517. ISBN: 0-933687-05-2
Note: In English. 67 refs.; illus. incl. sects., sketch maps
Summary: The geology of the Ross Sea region is known mainly from rock exposures along the Transantarctic Mountains to the west and Marie Byrd Land to the east. Six shallow (400 m) drillholes are sited offshore, but the geology and structure underlying the Ross Sea are mainly inferred from geophysical surveys. Continental basement consists of a Precambrian-lower Paleozoic granitic and metasedimentary complex overlain in the Transantarctic Mountains by Devonian to Triassic cover beds and extensive Jurassic basic intrusives and volcanics and in Marie Byrd Land by upper Paleozoic-Mesozoic granitoids and mid-Cretaceous mafic dykes. No younger in situ rocks are known until the late Oligocene (30 Ma). Upper Cenozoic rocks, in particular basic volcanics onshore and glacial-marine sediments offshore, occur extensively in the region. The Ross Sea is underlain by a thin (20-28 km) crust probably formed in post-Paleozoic times by crustal extension. Crustal extension, in late Mesozoic and Cenozoic, has led to continued rifting in the west forming the Victoria Land basin and Central trough. The Eastern basin appears to have formed mainly by downwarping resulting from crustal loading by glacial-marine sediments. Most of the sedimentary fill in the basins is of Cenozoic age, although Upper Cretaceous sediments may occur in the lower part of the section. In the Victoria Land basin, however, a deeper (6-12 km) stratified section may correspond to an upper Paleozoic-Mesozoic metasedimentary sequence. (Auth.)
Year of Publication: 1987
Research Program: DSDP Deep Sea Drilling Project
Key Words: 16 Structural Geology; 20 Geophysics, Applied; Antarctic Ocean; Antarctica; Basement; Basins; Bathymetry; Beacon Supergroup; Bowers Supergroup; Cenozoic; Continental crust; Crust; DSDP Site 270; Data processing; Deep Sea Drilling Project; Dikes; Evolution; Extension; Geophysical methods; Geophysical surveys; Glacial environment; Igneous rocks; Intrusions; Leg 28; Marie Byrd Land; Marine environment; McMurdo Sound; Mesozoic; Outcrops; Paleozoic; Precambrian; Rifting; Ross Sea; Sedimentary basins; Seismic methods; Southern Ocean; Structural geology; Surveys; Tectonics; Transantarctic Mountains; Velocity; Victoria Land; Volcanic rocks
Record ID: 1988075269
Copyright Information: GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from the Antarctic Bibliography, United States

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