Structural and tectonic evolution of the Ross Sea Rift in the Cape Colbeck region, eastern Ross Sea, Antarctica

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doi: 10.1029/2000TC001260
Author(s): Luyendyk, Bruce P.; Sorlien, Christopher C.; Wilson, Douglas S.; Bartek, Louis R.; Siddoway, Christine S.
Author Affiliation(s): Primary:
University of California at Santa Barbara, Department of Geological Sciences, Santa Barbara, CA, United States
University of Alabama, United States
Colorado College, United States
Volume Title: Tectonics
Source: Tectonics, 20(6), p.933-958. Publisher: American Geophysical Union, Washington, DC, United States. ISSN: 0278-7407 CODEN: TCTNDM
Note: In English. 100 refs.; illus., incl. 2 tables
Summary: Marine geophysics was used to investigate the structural framework and tectonic history of the eastern border of the Ross Sea Rift and to integrate this with what is known of Marie Byrd Land. The region is characterized by a passive margin with a flat shelf cut by the Miocene Colbeck Trough. Seismic sequences and unconformities of the Ross Sea areas were correlated with the Colbeck region. Late Oligocene and younger sections unconformably overlay Early to Late Cretaceous and early Tertiary sequences. This unconformity is underlain by two units interpreted as syn-rift units. The onshore and offshore region was widely faulted in Early and Late Cretaceous time and subsided during Late Cretaceous and Cenozoic time. Detachment-style extension is indicated for the late Early Cretaceous. Tilting of the shelf occurred in late Cenozoic due to continued subsidence of the shelf and uplift in western Marie Byrd Land. Further study of the dating of the units sampled in this study will provide additional correlation. (Mod. auth. abstr.)
Year of Publication: 2001
Research Program: ODP Ocean Drilling Program
Key Words: 16 Structural Geology; Africa; Antarctic Ocean; Antarctica; Basement; Bedrock; Cape Colbeck; Continental margin; Cretaceous; Faults; Geophysical methods; Ghana; Gravity methods; Ivory Coast; Leg 159; Mantle; Mantle plumes; Marie Byrd Land; Mesozoic; Metamorphic rocks; Mylonites; Ocean Drilling Program; Passive margins; Plate tectonics; Reflection methods; Rheology; Rifting; Ross Ice Shelf; Ross Sea; Ross Sea Rift; Sampling; Seismic methods; Southern Ocean; Tectonic elements; Tectonics; West Africa
Coordinates: N031503 N033740 W0024359 W0031056
Record ID: 2002061383
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