Seafloor spreading magnetic anomaly isochron map compilation for the Weddell Sea and Scotia Sea
The deep sea sedimentary record is an archive of the pre-glacial to glacial development of Antarctica and changes in climate, tectonics and ocean circulation. Identification of the pre-glacial, transitional and full glacial components in the sedimentary record is necessary for ice sheet reconstructi...
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ftpangaea:oai:pangaea.de:doi:10.1594/PANGAEA.777453 2023-05-15T13:42:10+02:00 Seafloor spreading magnetic anomaly isochron map compilation for the Weddell Sea and Scotia Sea Lindeque, Ansa Martos, Yasmina M Gohl, Karsten Maldonado, Andrés MEDIAN LATITUDE: -64.311280 * MEDIAN LONGITUDE: -36.791513 * SOUTH-BOUND LATITUDE: -71.036300 * WEST-BOUND LONGITUDE: -75.343538 * NORTH-BOUND LATITUDE: -53.174875 * EAST-BOUND LONGITUDE: -7.729100 2012-03-12 application/zip, 3 datasets https://doi.pangaea.de/10.1594/PANGAEA.777453 https://doi.org/10.1594/PANGAEA.777453 en eng PANGAEA https://doi.pangaea.de/10.1594/PANGAEA.777453 https://doi.org/10.1594/PANGAEA.777453 CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess CC-BY Supplement to: Lindeque, Ansa; Martos, Yasmina M; Gohl, Karsten; Maldonado, Andrés (2013): Deep-sea pre-glacial to glacial sedimentation in the Weddell Sea and southern Scotia Sea from a cross-basin seismic transect. Marine Geology, 336, 61-83, https://doi.org/10.1016/j.margeo.2012.11.004 AWI_Paleo Paleoenvironmental Reconstructions from Marine Sediments @ AWI Dataset 2012 ftpangaea https://doi.org/10.1594/PANGAEA.777453 https://doi.org/10.1016/j.margeo.2012.11.004 2023-01-20T07:32:27Z The deep sea sedimentary record is an archive of the pre-glacial to glacial development of Antarctica and changes in climate, tectonics and ocean circulation. Identification of the pre-glacial, transitional and full glacial components in the sedimentary record is necessary for ice sheet reconstruction and to build circum-Antarctic sediment thickness grids for past topography and bathymetry reconstructions, which constrain paleoclimate models. A ~3300 km long Weddell Sea to Scotia Sea transect consisting of multichannel seismic reflection data from various organisations, were used to interpret new horizons to define the initial basin-wide seismostratigraphy and to identify the pre-glacial to glacial components. We mapped seven main units of which three are in the inferred Cretaceous-Paleocene pre-glacial regime, one in the Eocene-Oligocene transitional regime and three units in the Miocene-Pleistocene full glacial climate regime. Sparse borehole data from ODP leg 113 and SHALDRIL constrain the ages of the upper three units. Compiled seafloor spreading magnetic anomalies constrain the basement ages and the hypothetical age model. In many cases, the new horizons and stratigraphy contradict the interpretations in local studies. Each seismic sedimentary unit and its associated base horizon are continuous and traceable for the entire transect length, but reflect a lateral change in age whilst representing the same deposition process. The up to 1240 m thick pre-glacial seismic units form a mound in the central Weddell Sea basin and, in conjunction with the eroded flank geometry, support the interpretation of a Cretaceous proto-Weddell Gyre. The base reflector of the transitional seismic unit, which marks the initial ice sheet advances to the outer shelf, has a lateral model age of 26.6-15.5 Ma from southeast to northwest. The Pliocene-Pleistocene glacial deposits reveals lower sedimentations rates, indicating a reduced sediment supply. Sedimentation rates for the pre-glacial, transitional and full glacial components ... Dataset Antarc* Antarctic Antarctica Ice Sheet Scotia Sea Weddell Sea PANGAEA - Data Publisher for Earth & Environmental Science Antarctic Scotia Sea Weddell Weddell Sea ENVELOPE(-75.343538,-7.729100,-53.174875,-71.036300) |
institution |
Open Polar |
collection |
PANGAEA - Data Publisher for Earth & Environmental Science |
op_collection_id |
ftpangaea |
language |
English |
topic |
AWI_Paleo Paleoenvironmental Reconstructions from Marine Sediments @ AWI |
spellingShingle |
AWI_Paleo Paleoenvironmental Reconstructions from Marine Sediments @ AWI Lindeque, Ansa Martos, Yasmina M Gohl, Karsten Maldonado, Andrés Seafloor spreading magnetic anomaly isochron map compilation for the Weddell Sea and Scotia Sea |
topic_facet |
AWI_Paleo Paleoenvironmental Reconstructions from Marine Sediments @ AWI |
description |
The deep sea sedimentary record is an archive of the pre-glacial to glacial development of Antarctica and changes in climate, tectonics and ocean circulation. Identification of the pre-glacial, transitional and full glacial components in the sedimentary record is necessary for ice sheet reconstruction and to build circum-Antarctic sediment thickness grids for past topography and bathymetry reconstructions, which constrain paleoclimate models. A ~3300 km long Weddell Sea to Scotia Sea transect consisting of multichannel seismic reflection data from various organisations, were used to interpret new horizons to define the initial basin-wide seismostratigraphy and to identify the pre-glacial to glacial components. We mapped seven main units of which three are in the inferred Cretaceous-Paleocene pre-glacial regime, one in the Eocene-Oligocene transitional regime and three units in the Miocene-Pleistocene full glacial climate regime. Sparse borehole data from ODP leg 113 and SHALDRIL constrain the ages of the upper three units. Compiled seafloor spreading magnetic anomalies constrain the basement ages and the hypothetical age model. In many cases, the new horizons and stratigraphy contradict the interpretations in local studies. Each seismic sedimentary unit and its associated base horizon are continuous and traceable for the entire transect length, but reflect a lateral change in age whilst representing the same deposition process. The up to 1240 m thick pre-glacial seismic units form a mound in the central Weddell Sea basin and, in conjunction with the eroded flank geometry, support the interpretation of a Cretaceous proto-Weddell Gyre. The base reflector of the transitional seismic unit, which marks the initial ice sheet advances to the outer shelf, has a lateral model age of 26.6-15.5 Ma from southeast to northwest. The Pliocene-Pleistocene glacial deposits reveals lower sedimentations rates, indicating a reduced sediment supply. Sedimentation rates for the pre-glacial, transitional and full glacial components ... |
format |
Dataset |
author |
Lindeque, Ansa Martos, Yasmina M Gohl, Karsten Maldonado, Andrés |
author_facet |
Lindeque, Ansa Martos, Yasmina M Gohl, Karsten Maldonado, Andrés |
author_sort |
Lindeque, Ansa |
title |
Seafloor spreading magnetic anomaly isochron map compilation for the Weddell Sea and Scotia Sea |
title_short |
Seafloor spreading magnetic anomaly isochron map compilation for the Weddell Sea and Scotia Sea |
title_full |
Seafloor spreading magnetic anomaly isochron map compilation for the Weddell Sea and Scotia Sea |
title_fullStr |
Seafloor spreading magnetic anomaly isochron map compilation for the Weddell Sea and Scotia Sea |
title_full_unstemmed |
Seafloor spreading magnetic anomaly isochron map compilation for the Weddell Sea and Scotia Sea |
title_sort |
seafloor spreading magnetic anomaly isochron map compilation for the weddell sea and scotia sea |
publisher |
PANGAEA |
publishDate |
2012 |
url |
https://doi.pangaea.de/10.1594/PANGAEA.777453 https://doi.org/10.1594/PANGAEA.777453 |
op_coverage |
MEDIAN LATITUDE: -64.311280 * MEDIAN LONGITUDE: -36.791513 * SOUTH-BOUND LATITUDE: -71.036300 * WEST-BOUND LONGITUDE: -75.343538 * NORTH-BOUND LATITUDE: -53.174875 * EAST-BOUND LONGITUDE: -7.729100 |
long_lat |
ENVELOPE(-75.343538,-7.729100,-53.174875,-71.036300) |
geographic |
Antarctic Scotia Sea Weddell Weddell Sea |
geographic_facet |
Antarctic Scotia Sea Weddell Weddell Sea |
genre |
Antarc* Antarctic Antarctica Ice Sheet Scotia Sea Weddell Sea |
genre_facet |
Antarc* Antarctic Antarctica Ice Sheet Scotia Sea Weddell Sea |
op_source |
Supplement to: Lindeque, Ansa; Martos, Yasmina M; Gohl, Karsten; Maldonado, Andrés (2013): Deep-sea pre-glacial to glacial sedimentation in the Weddell Sea and southern Scotia Sea from a cross-basin seismic transect. Marine Geology, 336, 61-83, https://doi.org/10.1016/j.margeo.2012.11.004 |
op_relation |
https://doi.pangaea.de/10.1594/PANGAEA.777453 https://doi.org/10.1594/PANGAEA.777453 |
op_rights |
CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.1594/PANGAEA.777453 https://doi.org/10.1016/j.margeo.2012.11.004 |
_version_ |
1766164193603485696 |