Results of geophysical research in Ross Sea
The Ross Sea is underlain from the east to the west by three north-south-trending sedimentary basins: the Eastern basin (east of the 180/sup 0/ meridian), the Central basin (along 175/sup 0/), and the Victoria Land basin. In the center of the Eastern basin, the thickness of the sediments generally ranges between 3000 and 6000 m. The pre-late Oligocene sediments occur only in the center of the basin. There are no indications of block faulting in the sedimentary sequence, indicating that synsedimentary subsidence has been the dominant tectonic process. A broad basement high, the Central High, lies to the west of the Eastern basin. The top of basement is a peneplain over large parts of the high. The overlying sediments are mostly younger than Oligocene. The Central basin lies to the west of the Central High, extends approximately north-south through the central Ross Sea. Sedimentary thicknesses in excess of 6000 m were observed. A relatively narrow basement high, trending north-south, separates the Central basin from the complex Victoria Land basin. The Victoria Land basin is a 150-km wide basin that extends from the Ross Ice shelf to 75/sup 0/S. It is bounded to the north by a shallow and characteristically planated basement high, the Coulman High, and to the west by the uplifted Transantarctic Mountains. The Victoria Land basin is subdivided by north-south-trending zones of volcanic/magmatic intrusions, probably equivalents of the Neogene Hallett Volcanics and McMurdo Volcanics, respectively, that affected the Victoria Land basin, resulting in uplift and inversion of parts of the basin.
- Research Organization:
- Institute for Geosciences and Natural Resources, Hannover, West Germany
- OSTI ID:
- 5993485
- Report Number(s):
- CONF-870606-
- Journal Information:
- AAPG (Am. Assoc. Pet. Geol.) Bull.; (United States), Journal Name: AAPG (Am. Assoc. Pet. Geol.) Bull.; (United States) Vol. 71:5; ISSN AABUD
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
020200* -- Petroleum-- Reserves
Geology
& Exploration
ANTARCTIC REGIONS
ANTARCTICA
CENOZOIC ERA
GEOLOGIC AGES
GEOLOGIC STRUCTURES
GEOPHYSICAL SURVEYS
IGNEOUS ROCKS
PACIFIC OCEAN
POLAR REGIONS
ROCKS
SEAS
SEDIMENTARY BASINS
SURFACE WATERS
SURVEYS
TECTONICS
TERTIARY PERIOD
VOLCANIC ROCKS