Plio-Pleistocene magnetic polarity stratigraphies of ODP Leg 177 Sites from the South Atlantic
Magnetic polarity stratigraphies from ODP Leg 177 'high resolution' sites indicate Brunhes sedimentation rates in the 12-25 cm/kyr range, with a trend of decreasing sedimentation rates with increasing age. Magnetite is the principal remanence-carrying mineral. Downcore alteration of magnet...
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ftpangaea:oai:pangaea.de:doi:10.1594/PANGAEA.678516 2023-05-15T18:21:12+02:00 Plio-Pleistocene magnetic polarity stratigraphies of ODP Leg 177 Sites from the South Atlantic Channell, James E T Stoner, Joseph S MEDIAN LATITUDE: -47.796983 * MEDIAN LONGITUDE: 6.702246 * SOUTH-BOUND LATITUDE: -53.180350 * WEST-BOUND LONGITUDE: 5.130333 * NORTH-BOUND LATITUDE: -40.936333 * EAST-BOUND LONGITUDE: 9.893983 * DATE/TIME START: 1997-12-19T00:00:00 * DATE/TIME END: 1998-01-20T00:00:00 2002-01-22 application/zip, 4 datasets https://doi.pangaea.de/10.1594/PANGAEA.678516 https://doi.org/10.1594/PANGAEA.678516 en eng PANGAEA https://doi.pangaea.de/10.1594/PANGAEA.678516 https://doi.org/10.1594/PANGAEA.678516 CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess CC-BY Supplement to: Channell, James E T; Stoner, Joseph S (2002): Plio-Pleistocene magnetic polarity stratigraphies and diagenetic magnetite dissolution at ODP Leg 177 Sites (1089, 1091, 1093 and 1094). Marine Micropaleontology, 45(3-4), 269-290, https://doi.org/10.1016/S0377-8398(02)00032-4 177-1089 177-1091 177-1093 177-1094 COMPCORE Composite Core Joides Resolution Leg177 Ocean Drilling Program ODP South Atlantic Ocean Dataset 2002 ftpangaea https://doi.org/10.1594/PANGAEA.678516 https://doi.org/10.1016/S0377-8398(02)00032-4 2023-01-20T07:31:06Z Magnetic polarity stratigraphies from ODP Leg 177 'high resolution' sites indicate Brunhes sedimentation rates in the 12-25 cm/kyr range, with a trend of decreasing sedimentation rates with increasing age. Magnetite is the principal remanence-carrying mineral. Downcore alteration of magnetite and authigenic growth of iron sulfides introduces a high coercivity diagenetic remanence carrier (pyrrhotite). The change in pore water sulfate with depth in the sediment tends to be in step with the decrease in magnetization intensity, indicating the link between sulfate reduction and magnetite dissolution. Shipboard pass-through magnetometer data are generally very noisy due to a combination of weak magnetization intensities, drilling-related core deformation, and the influence of authigenic iron sulfides. Post-cruise progressive demagnetization of discrete samples aids the magnetostratigraphic interpretation, as these measurements are less influenced by low magnetization intensities and drilling-related deformation. The magnetostratigraphic interpretations provide much-needed calibration for biostratigraphic events in the high latitude southern oceans. Apart from the ODP Hole 745B (Kerguelen Plateau), published Plio-Pleistocene magnetostratigraphies from ODP sites in the Southern Ocean are poorly constrained. For this reason, we compare interpolated ages of 11 radiolarian events and one diatom event that occur at Hole 745B and Leg 177 sites. Dataset South Atlantic Ocean Southern Ocean PANGAEA - Data Publisher for Earth & Environmental Science Kerguelen Southern Ocean ENVELOPE(5.130333,9.893983,-40.936333,-53.180350) |
institution |
Open Polar |
collection |
PANGAEA - Data Publisher for Earth & Environmental Science |
op_collection_id |
ftpangaea |
language |
English |
topic |
177-1089 177-1091 177-1093 177-1094 COMPCORE Composite Core Joides Resolution Leg177 Ocean Drilling Program ODP South Atlantic Ocean |
spellingShingle |
177-1089 177-1091 177-1093 177-1094 COMPCORE Composite Core Joides Resolution Leg177 Ocean Drilling Program ODP South Atlantic Ocean Channell, James E T Stoner, Joseph S Plio-Pleistocene magnetic polarity stratigraphies of ODP Leg 177 Sites from the South Atlantic |
topic_facet |
177-1089 177-1091 177-1093 177-1094 COMPCORE Composite Core Joides Resolution Leg177 Ocean Drilling Program ODP South Atlantic Ocean |
description |
Magnetic polarity stratigraphies from ODP Leg 177 'high resolution' sites indicate Brunhes sedimentation rates in the 12-25 cm/kyr range, with a trend of decreasing sedimentation rates with increasing age. Magnetite is the principal remanence-carrying mineral. Downcore alteration of magnetite and authigenic growth of iron sulfides introduces a high coercivity diagenetic remanence carrier (pyrrhotite). The change in pore water sulfate with depth in the sediment tends to be in step with the decrease in magnetization intensity, indicating the link between sulfate reduction and magnetite dissolution. Shipboard pass-through magnetometer data are generally very noisy due to a combination of weak magnetization intensities, drilling-related core deformation, and the influence of authigenic iron sulfides. Post-cruise progressive demagnetization of discrete samples aids the magnetostratigraphic interpretation, as these measurements are less influenced by low magnetization intensities and drilling-related deformation. The magnetostratigraphic interpretations provide much-needed calibration for biostratigraphic events in the high latitude southern oceans. Apart from the ODP Hole 745B (Kerguelen Plateau), published Plio-Pleistocene magnetostratigraphies from ODP sites in the Southern Ocean are poorly constrained. For this reason, we compare interpolated ages of 11 radiolarian events and one diatom event that occur at Hole 745B and Leg 177 sites. |
format |
Dataset |
author |
Channell, James E T Stoner, Joseph S |
author_facet |
Channell, James E T Stoner, Joseph S |
author_sort |
Channell, James E T |
title |
Plio-Pleistocene magnetic polarity stratigraphies of ODP Leg 177 Sites from the South Atlantic |
title_short |
Plio-Pleistocene magnetic polarity stratigraphies of ODP Leg 177 Sites from the South Atlantic |
title_full |
Plio-Pleistocene magnetic polarity stratigraphies of ODP Leg 177 Sites from the South Atlantic |
title_fullStr |
Plio-Pleistocene magnetic polarity stratigraphies of ODP Leg 177 Sites from the South Atlantic |
title_full_unstemmed |
Plio-Pleistocene magnetic polarity stratigraphies of ODP Leg 177 Sites from the South Atlantic |
title_sort |
plio-pleistocene magnetic polarity stratigraphies of odp leg 177 sites from the south atlantic |
publisher |
PANGAEA |
publishDate |
2002 |
url |
https://doi.pangaea.de/10.1594/PANGAEA.678516 https://doi.org/10.1594/PANGAEA.678516 |
op_coverage |
MEDIAN LATITUDE: -47.796983 * MEDIAN LONGITUDE: 6.702246 * SOUTH-BOUND LATITUDE: -53.180350 * WEST-BOUND LONGITUDE: 5.130333 * NORTH-BOUND LATITUDE: -40.936333 * EAST-BOUND LONGITUDE: 9.893983 * DATE/TIME START: 1997-12-19T00:00:00 * DATE/TIME END: 1998-01-20T00:00:00 |
long_lat |
ENVELOPE(5.130333,9.893983,-40.936333,-53.180350) |
geographic |
Kerguelen Southern Ocean |
geographic_facet |
Kerguelen Southern Ocean |
genre |
South Atlantic Ocean Southern Ocean |
genre_facet |
South Atlantic Ocean Southern Ocean |
op_source |
Supplement to: Channell, James E T; Stoner, Joseph S (2002): Plio-Pleistocene magnetic polarity stratigraphies and diagenetic magnetite dissolution at ODP Leg 177 Sites (1089, 1091, 1093 and 1094). Marine Micropaleontology, 45(3-4), 269-290, https://doi.org/10.1016/S0377-8398(02)00032-4 |
op_relation |
https://doi.pangaea.de/10.1594/PANGAEA.678516 https://doi.org/10.1594/PANGAEA.678516 |
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.678516 https://doi.org/10.1016/S0377-8398(02)00032-4 |
_version_ |
1766200347752136704 |