Miocene changes in bottom current regime recorded in continental rise sediments on the Pacific margin of the Antarctic Peninsula

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doi: 10.1029/2004GL020298
Author(s): Hernández-Molina, F. J.; Larter, R. D.; Rebesco, M.; Maldonado, A.
Author Affiliation(s): Primary:
Universidad de Vigo, Departamento de Geociencias Marinas, Vigo, Spain
Other:
British Antarctic Survey, United Kingdom
Istituto Nazionale di Oceanografia e di Geofisica Sperimentale, Italy
Instituto Andaluz de Ciencias de la Tierra, Spain
Volume Title: Geophysical Research Letters
Source: Geophysical Research Letters, 31(22), 5p. Publisher: American Geophysical Union, Washington, DC, United States. ISSN: 0094-8276 CODEN: GPRLAJ
Note: In English. 12 refs.; illus., incl. geol. sketch map, sect., block diag.
Summary: A Fossil Mounded Sedimentary Body (MB) has been identified in the Miocene sedimentary record on the central continental rise west of Adelaide Island, Antarctic Peninsula, using multichannel seismic reflection profiles. The MB has an elongated NE trend away from a group of seamounts, and it developed between two troughs. We interpret it as a patch drift plastered against the NE side of an obstacle. The MB's depositional patterns provide the first clear evidence of Early Miocene bottom current activity on the central rise, and they suggest that flow was towards the NE, probably as part of the Antarctic Circumpolar Current. (mod. journ. abstr.)
Year of Publication: 2004
Research Program: DSDP Deep Sea Drilling Project
ODP Ocean Drilling Program
Key Words: 12 Stratigraphy, Historical Geology and Paleoecology; 20 Geophysics, Applied; Adelaide Island; Antarctic Circumpolar Current; Antarctic Peninsula; Antarctica; Cenozoic; Continental rise; Contourite; DSDP Site 325; Deep Sea Drilling Project; Deep-sea environment; Geophysical methods; Geophysical surveys; Leg 178; Leg 35; Marine environment; Miocene; Neogene; Ocean Drilling Program; Ocean floors; Paleo-oceanography; Paleocirculation; Paleocurrents; Seismic methods; Southern Ocean; Surveys; Tertiary
Coordinates: S650247 S650247 W0734024 W0734024
Record ID: 2005056544
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