Extent and nature of Ross Sea unconformity in the western Ross Sea, Antarctica

Author(s): Karl, H. A.; Reimnitz, Erk; Edwards, B. D.
Author Affiliation(s): Primary:
U. S. Geol. Surv., Menlo Park, CA, United States
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.77-92. Publisher: Circum-Pacific Council for Energy and Mineral Resources, Houston, TX, United States. ISSN: 1068-6517. ISBN: 0-933687-05-2
Note: In English. 18 refs.; sects., sketch maps
Summary: High-resolution seismic-reflection data recovered in the western Ross Sea during 1984 confirm the suspected existence of a regional unconformity of late Tertiary(?)-Quaternary(?) age. This Ross Sea unconformity (RSU), often lies within 2 m of the sea floor and on seismic-reflection lines is nowhere deeper than 40 m below the sea floor. It is identified acoustically as a strong angular unconformity or a paraconformity. It is correlated with the unconformity at 42 m subbottom penetrated at DSDP Leg 28 drillsite 273 and mapped over most of the western Ross Sea. The data support the hypothesis that the RSU records the climax advance of the West Antarctic Ice Sheet. Timing of the formation of the RSU is controversial, because biostratigraphic zonations upon which the age is based are still being refined and the section is heavily reworked. (Auth.)
Year of Publication: 1987
Research Program: DSDP Deep Sea Drilling Project
Key Words: 12 Stratigraphy, Historical Geology and Paleoecology; 20 Geophysics, Applied; Angular unconformities; Antarctic Ocean; Antarctic ice sheet; Antarctica; Cenozoic; Cores; Correlation; DSDP Site 270; DSDP Site 272; DSDP Site 273; Deep Sea Drilling Project; Erosion; Geophysical methods; Geophysical profiles; Geophysical surveys; Leg 28; McMurdo Sound; Quaternary; Reflection; Ross Sea; Seismic methods; Seismic profiles; Southern Ocean; Stratigraphy; Surveys; Terra Nova Bay; Tertiary; Unconformities; Victoria Land
Coordinates: S780000 S740000 E1750000 E1650000
Record ID: 1988075272
Copyright Information: GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from the Antarctic Bibliography, United States