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- Title
The stages of the development of the basin of the Bransfield Strait.
- Authors
Schreider, Al.; Schreider, A.; Evsenko, E.
- Abstract
The study of the sedimentary body of the Bransfield Strait has made it possible to identify several sedimentary complexes, to construct the first electronic charts for the acoustic basement, and to establish four stages of the evolution of its floor, which updates the previous knowledge about the formation of the strait. At the first stage, there was an increase in tension stresses that were accompanied by the local splits of the continental crust at the periphery of the Antarctic Peninsula. At the second stage, a graben-like structure filled with the Lower stratigraphic complex was formed northward of the Antarctic Peninsula. At the third stage, the continuing processes of extension led to intensive explosive activity of the growing volcanic structures and filling of the graben with sediments of the Middle seismostratigraphic complex. The fourth stage, which has continued until recently, is characterized by quasi-linear localization of the major centers of volcanic activity in the band closer to the South-Shetland Islands and the formation of the Upper seismostratigraphic sedimentary complex. The evolution of the floor of the Bransfield Strait reflects the process of penetration of the American-Antarctic ridge to the continental lithosphere of the Antarctic Peninsula for the last million years.
- Subjects
BRANSFIELD Strait; ANTARCTIC Peninsula (Antarctica); LITHOSPHERE; MARINE sediments; GRABENS (Geology); STRATIGRAPHIC geology
- Publication
Oceanology (00014370), 2014, Vol 54, Issue 3, p365
- ISSN
0001-4370
- Publication type
Article
- DOI
10.1134/S0001437014020234