Seismic stratigraphy of the Adare Trough area, Antarctica

The Adare Trough, located 100 km NE of Cape Adare, Antarctica, is the extinct third arm of a Tertiary spreading ridge that separated East from West Antarctica. We use seismic reflection data, tied to DSDP Site 274, to link our seismic stratigraphic interpretation to changes in ocean-bottom currents,...

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Published in:Marine Geology
Main Authors: Whittaker, JM, Muller, RD
Format: Article in Journal/Newspaper
Language:English
Published: 2006
Subjects:
Online Access:https://eprints.utas.edu.au/16929/
https://eprints.utas.edu.au/16929/1/Whittaker_Muller_Adare_Trough_area_seismic_strat_MarGeo2006_%282%29.pdf
https://doi.org/10.1016/j.margeo.2006.05.002
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spelling ftunivtasmania:oai:eprints.utas.edu.au:16929 2023-05-15T14:00:15+02:00 Seismic stratigraphy of the Adare Trough area, Antarctica Whittaker, JM Muller, RD 2006 application/pdf https://eprints.utas.edu.au/16929/ https://eprints.utas.edu.au/16929/1/Whittaker_Muller_Adare_Trough_area_seismic_strat_MarGeo2006_%282%29.pdf https://doi.org/10.1016/j.margeo.2006.05.002 en eng https://eprints.utas.edu.au/16929/1/Whittaker_Muller_Adare_Trough_area_seismic_strat_MarGeo2006_%282%29.pdf Whittaker, JM and Muller, RD 2006 , 'Seismic stratigraphy of the Adare Trough area, Antarctica' , Marine Geology, vol. 230 , pp. 179-197 , doi:10.1016/j.margeo.2006.05.002 <http://dx.doi.org/10.1016/j.margeo.2006.05.002>. cc_utas Article PeerReviewed 2006 ftunivtasmania https://doi.org/10.1016/j.margeo.2006.05.002 2020-05-30T07:30:48Z The Adare Trough, located 100 km NE of Cape Adare, Antarctica, is the extinct third arm of a Tertiary spreading ridge that separated East from West Antarctica. We use seismic reflection data, tied to DSDP Site 274, to link our seismic stratigraphic interpretation to changes in ocean-bottom currents, Ross Sea ice cover, and regional tectonics through time. Two extended unconformities are observed in the seismic profiles. We suggest that the earliest hiatus (early Oligocene to Mid-Miocene) is related to low sediment supply from the adjacent Ross Shelf, comprised of small, isolated basins. The later hiatus (mid-Miocene to late Miocene) is likely caused by strong bottom currents sourced from the open-marine Ross Sea due to increased Antarctic glaciation induced by mid-Miocene cooling (from Mi-3). Further global cooling during the Pliocene, causing changes in global ocean circulation patterns, correlates with Adare Basin sediments and indicate the continuing but weakened influence of bottom currents. The contourite/turbidite pattern present in the Adare Trough seismic data is consistent with the 3-phase contourite growth system proposed for the Weddell Sea and Antarctic Peninsula. Multibeam bathymetry and seismic reflection profiles show ubiquitous volcanic cones and intrusions throughout the Adare Basin that we interpret to have formed from the Oligocene to the present. Seismic reflection profiles reveal trans-tensional/strike-slip faults that indicate oblique extension dominated Adare Trough tectonics at 32–15 Ma. Observed volcanism patterns and anomalously shallow basement depth in the Adare Trough area are most likely caused by mantle upwelling, an explanation supported by mantle density reconstructions, which show anomalously hot mantle beneath the Adare Trough area forming in the Late Tertiary. Article in Journal/Newspaper Antarc* Antarctic Antarctic Peninsula Antarctica Ross Sea Sea ice Weddell Sea West Antarctica University of Tasmania: UTas ePrints Antarctic Antarctic Peninsula Weddell Sea Ross Sea West Antarctica Weddell Adare ENVELOPE(170.233,170.233,-71.283,-71.283) Cape Adare ENVELOPE(175.000,175.000,-71.000,-71.000) Adare Basin ENVELOPE(175.000,175.000,-71.000,-71.000) Adare Trough ENVELOPE(172.500,172.500,-70.033,-70.033) Marine Geology 230 3-4 179 197
institution Open Polar
collection University of Tasmania: UTas ePrints
op_collection_id ftunivtasmania
language English
description The Adare Trough, located 100 km NE of Cape Adare, Antarctica, is the extinct third arm of a Tertiary spreading ridge that separated East from West Antarctica. We use seismic reflection data, tied to DSDP Site 274, to link our seismic stratigraphic interpretation to changes in ocean-bottom currents, Ross Sea ice cover, and regional tectonics through time. Two extended unconformities are observed in the seismic profiles. We suggest that the earliest hiatus (early Oligocene to Mid-Miocene) is related to low sediment supply from the adjacent Ross Shelf, comprised of small, isolated basins. The later hiatus (mid-Miocene to late Miocene) is likely caused by strong bottom currents sourced from the open-marine Ross Sea due to increased Antarctic glaciation induced by mid-Miocene cooling (from Mi-3). Further global cooling during the Pliocene, causing changes in global ocean circulation patterns, correlates with Adare Basin sediments and indicate the continuing but weakened influence of bottom currents. The contourite/turbidite pattern present in the Adare Trough seismic data is consistent with the 3-phase contourite growth system proposed for the Weddell Sea and Antarctic Peninsula. Multibeam bathymetry and seismic reflection profiles show ubiquitous volcanic cones and intrusions throughout the Adare Basin that we interpret to have formed from the Oligocene to the present. Seismic reflection profiles reveal trans-tensional/strike-slip faults that indicate oblique extension dominated Adare Trough tectonics at 32–15 Ma. Observed volcanism patterns and anomalously shallow basement depth in the Adare Trough area are most likely caused by mantle upwelling, an explanation supported by mantle density reconstructions, which show anomalously hot mantle beneath the Adare Trough area forming in the Late Tertiary.
format Article in Journal/Newspaper
author Whittaker, JM
Muller, RD
spellingShingle Whittaker, JM
Muller, RD
Seismic stratigraphy of the Adare Trough area, Antarctica
author_facet Whittaker, JM
Muller, RD
author_sort Whittaker, JM
title Seismic stratigraphy of the Adare Trough area, Antarctica
title_short Seismic stratigraphy of the Adare Trough area, Antarctica
title_full Seismic stratigraphy of the Adare Trough area, Antarctica
title_fullStr Seismic stratigraphy of the Adare Trough area, Antarctica
title_full_unstemmed Seismic stratigraphy of the Adare Trough area, Antarctica
title_sort seismic stratigraphy of the adare trough area, antarctica
publishDate 2006
url https://eprints.utas.edu.au/16929/
https://eprints.utas.edu.au/16929/1/Whittaker_Muller_Adare_Trough_area_seismic_strat_MarGeo2006_%282%29.pdf
https://doi.org/10.1016/j.margeo.2006.05.002
long_lat ENVELOPE(170.233,170.233,-71.283,-71.283)
ENVELOPE(175.000,175.000,-71.000,-71.000)
ENVELOPE(175.000,175.000,-71.000,-71.000)
ENVELOPE(172.500,172.500,-70.033,-70.033)
geographic Antarctic
Antarctic Peninsula
Weddell Sea
Ross Sea
West Antarctica
Weddell
Adare
Cape Adare
Adare Basin
Adare Trough
geographic_facet Antarctic
Antarctic Peninsula
Weddell Sea
Ross Sea
West Antarctica
Weddell
Adare
Cape Adare
Adare Basin
Adare Trough
genre Antarc*
Antarctic
Antarctic Peninsula
Antarctica
Ross Sea
Sea ice
Weddell Sea
West Antarctica
genre_facet Antarc*
Antarctic
Antarctic Peninsula
Antarctica
Ross Sea
Sea ice
Weddell Sea
West Antarctica
op_relation https://eprints.utas.edu.au/16929/1/Whittaker_Muller_Adare_Trough_area_seismic_strat_MarGeo2006_%282%29.pdf
Whittaker, JM and Muller, RD 2006 , 'Seismic stratigraphy of the Adare Trough area, Antarctica' , Marine Geology, vol. 230 , pp. 179-197 , doi:10.1016/j.margeo.2006.05.002 <http://dx.doi.org/10.1016/j.margeo.2006.05.002>.
op_rights cc_utas
op_doi https://doi.org/10.1016/j.margeo.2006.05.002
container_title Marine Geology
container_volume 230
container_issue 3-4
container_start_page 179
op_container_end_page 197
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