Offshore investigations on Wilkes land-Victoria land margin, Antarctica
In January 1984, the US Geological Survey research vessel S. P. Lee carried out investigations of the Antarctic continental margin in the Wilkes Land Victoria Land areas, using 24-channel and high-resolution seismic, sonobuoy refraction, gravity, magnetic, and bottom-sampling methods. This investigation augmented previous surveys of the Dumont d'Urville area by the French Petroleum Institute and explored new areas west and east to the boundary between the onshore Wilkes basin and the Victoria Land highlands. These surveys defined sediment thickness distribution and seismic stratigraphy in this frontier area. The tectonic style of the boundary between the East Antarctic craton and the younger crust of West Antarctica in the Ross Sea is revealed by one multichannel seismic line across this important boundary. The initial breakup of Antarctical from Australia occurred as a slowly spreading phase during the middle Cretaceous. According to Deep Sea Drilling Project results on the Tasman Rise, conditions of restricted circulation existed in the growing basin between the continents before the late Eocene. After the late Eocene, the major oceanic circulation pattern was established. Before that time, conditions were favorable for preservation of organic-carbon deposits on the sea floor. Among the questions to be addressed with this data are the following. How do apparent subsidence rates of this passive margin compare with others around the world. Does the onshore subglacial Wilkes basins to the Otway and Ceduna basins of Australia exists. What is the effect of the ice cap on the stratigraphy of this margin. Do the two major Tertiary ice advances have conspicuous seismic-stratigraphic signatures.
- Research Organization:
- Geological Survey, Menlo Park, CA
- OSTI ID:
- 6571580
- Report Number(s):
- CONF-8405216-
- Journal Information:
- Am. Assoc. Pet. Geol., Bull.; (United States), Vol. 68:4; Conference: AAPG annual convention, San Antonio, TX, USA, 20 May 1984
- Country of Publication:
- United States
- Language:
- English
Similar Records
Correlations of onshore/offshore structure from a combined AVHRR/Geosat altimeter image of the Antarctic Plate
Geophysical and geologic studies of Ross Sea continental margin, Antarctica
Related Subjects
03 NATURAL GAS
ANTARCTIC REGIONS
GEOLOGICAL SURVEYS
PETROLEUM DEPOSITS
EXPLORATION
CONTINENTAL MARGIN
CONTINENTAL SHELF
CRETACEOUS PERIOD
OFFSHORE SITES
SEDIMENTARY BASINS
STRATIGRAPHY
TERTIARY PERIOD
CENOZOIC ERA
GEOLOGIC AGES
GEOLOGIC DEPOSITS
GEOLOGIC STRUCTURES
GEOLOGY
MESOZOIC ERA
MINERAL RESOURCES
POLAR REGIONS
RESOURCES
SURVEYS
020200* - Petroleum- Reserves
Geology
& Exploration
030200 - Natural Gas- Reserves
Geology
& Exploration