Paleomagnetic record of Site 177-1089
We report geomagnetic directional paleosecular variation, relative paleointensity proxies and oxygen isotope data from the upper 88 m composite depth (mcd) at South Atlantic Ocean Drilling Program (ODP) Site 1089 (40°56.2?S, 9°53.64?E, 4620 m water depth). The age model is provided by high-resolutio...
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ftpangaea:oai:pangaea.de:doi:10.1594/PANGAEA.808783 2024-09-15T18:14:30+00:00 Paleomagnetic record of Site 177-1089 Stoner, Joseph S Channell, James E T Hodell, David A Charles, Christopher D LATITUDE: -40.936333 * LONGITUDE: 9.893983 * DATE/TIME START: 1997-12-19T00:00:00 * DATE/TIME END: 1997-12-19T00:00:00 * MINIMUM DEPTH, sediment/rock: 0.00827 m * MAXIMUM DEPTH, sediment/rock: 17.89300 m 2013 text/tab-separated-values, 6840 data points https://doi.pangaea.de/10.1594/PANGAEA.808783 https://doi.org/10.1594/PANGAEA.808783 en eng PANGAEA https://doi.pangaea.de/10.1594/PANGAEA.808783 https://doi.org/10.1594/PANGAEA.808783 CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess Supplement to: Stoner, Joseph S; Channell, James E T; Hodell, David A; Charles, Christopher D (2003): A ~580 kyr paleomagnetic record from the sub-Antarctic South Atlantic (Ocean Drilling Program Site 1089). Journal of Geophysical Research: Solid Earth, 108(B5), 2244, https://doi.org/10.1029/2001JB001390 177-1089 AGE COMPCORE Composite Core DEPTH sediment/rock Joides Resolution Leg177 Maximum angular deviation NRM Declination Inclination Ocean Drilling Program ODP Relative paleointensity proxy South Atlantic Ocean dataset 2013 ftpangaea https://doi.org/10.1594/PANGAEA.80878310.1029/2001JB001390 2024-07-24T02:31:32Z We report geomagnetic directional paleosecular variation, relative paleointensity proxies and oxygen isotope data from the upper 88 m composite depth (mcd) at South Atlantic Ocean Drilling Program (ODP) Site 1089 (40°56.2?S, 9°53.64?E, 4620 m water depth). The age model is provided by high-resolution oxygen isotope stratigraphy, augmented by radiocarbon dates from the upper 8 mcd of nearby piston core RC11-83. Mean sedimentation rates at Site 1089 are in the range of 15 to 20 cm/kyr. Two intervals during the Brunhes Chron, at ?29.6 mcd (?190 ka) and at ?48 mcd (?335 ka), have component magnetization directions with positive (reverse polarity) inclination; however, the excursional directions are heavily overprinted by the postexcursional field. Magnetite is the dominant carrier of magnetic remanence, and occurs in the pseudosingle-domain (PSD) grain size. An additional higher-coercivity magnetic carrier, characterized by low unblocking temperatures (<350°C), is assumed to be authigenic pyrrhotite. A decrease in magnetization intensity down core is mirrored by a reduction in pore water sulfate, indicating diagenetic reduction of magnetite. Despite down-core changes in magnetic mineralogy, normalized intensity records from Site 1089 are comparable with high-resolution paleointensity records from the North Atlantic (e.g., ODP Sites 983 and 984). Sediment properties and sedimentation patterns within the Cape (Site 1089) and Iceland (Sites 983 and 984) Basins are distinctly different at both millennial and orbital timescales and therefore preclude lithologic variability from being the source of this correlation. Variations in normalized intensity from Site 1089 therefore appear to reflect changes in global-scale geomagnetic field intensity. Dataset Iceland North Atlantic South Atlantic Ocean PANGAEA - Data Publisher for Earth & Environmental Science ENVELOPE(9.893983,9.893983,-40.936333,-40.936333) |
institution |
Open Polar |
collection |
PANGAEA - Data Publisher for Earth & Environmental Science |
op_collection_id |
ftpangaea |
language |
English |
topic |
177-1089 AGE COMPCORE Composite Core DEPTH sediment/rock Joides Resolution Leg177 Maximum angular deviation NRM Declination Inclination Ocean Drilling Program ODP Relative paleointensity proxy South Atlantic Ocean |
spellingShingle |
177-1089 AGE COMPCORE Composite Core DEPTH sediment/rock Joides Resolution Leg177 Maximum angular deviation NRM Declination Inclination Ocean Drilling Program ODP Relative paleointensity proxy South Atlantic Ocean Stoner, Joseph S Channell, James E T Hodell, David A Charles, Christopher D Paleomagnetic record of Site 177-1089 |
topic_facet |
177-1089 AGE COMPCORE Composite Core DEPTH sediment/rock Joides Resolution Leg177 Maximum angular deviation NRM Declination Inclination Ocean Drilling Program ODP Relative paleointensity proxy South Atlantic Ocean |
description |
We report geomagnetic directional paleosecular variation, relative paleointensity proxies and oxygen isotope data from the upper 88 m composite depth (mcd) at South Atlantic Ocean Drilling Program (ODP) Site 1089 (40°56.2?S, 9°53.64?E, 4620 m water depth). The age model is provided by high-resolution oxygen isotope stratigraphy, augmented by radiocarbon dates from the upper 8 mcd of nearby piston core RC11-83. Mean sedimentation rates at Site 1089 are in the range of 15 to 20 cm/kyr. Two intervals during the Brunhes Chron, at ?29.6 mcd (?190 ka) and at ?48 mcd (?335 ka), have component magnetization directions with positive (reverse polarity) inclination; however, the excursional directions are heavily overprinted by the postexcursional field. Magnetite is the dominant carrier of magnetic remanence, and occurs in the pseudosingle-domain (PSD) grain size. An additional higher-coercivity magnetic carrier, characterized by low unblocking temperatures (<350°C), is assumed to be authigenic pyrrhotite. A decrease in magnetization intensity down core is mirrored by a reduction in pore water sulfate, indicating diagenetic reduction of magnetite. Despite down-core changes in magnetic mineralogy, normalized intensity records from Site 1089 are comparable with high-resolution paleointensity records from the North Atlantic (e.g., ODP Sites 983 and 984). Sediment properties and sedimentation patterns within the Cape (Site 1089) and Iceland (Sites 983 and 984) Basins are distinctly different at both millennial and orbital timescales and therefore preclude lithologic variability from being the source of this correlation. Variations in normalized intensity from Site 1089 therefore appear to reflect changes in global-scale geomagnetic field intensity. |
format |
Dataset |
author |
Stoner, Joseph S Channell, James E T Hodell, David A Charles, Christopher D |
author_facet |
Stoner, Joseph S Channell, James E T Hodell, David A Charles, Christopher D |
author_sort |
Stoner, Joseph S |
title |
Paleomagnetic record of Site 177-1089 |
title_short |
Paleomagnetic record of Site 177-1089 |
title_full |
Paleomagnetic record of Site 177-1089 |
title_fullStr |
Paleomagnetic record of Site 177-1089 |
title_full_unstemmed |
Paleomagnetic record of Site 177-1089 |
title_sort |
paleomagnetic record of site 177-1089 |
publisher |
PANGAEA |
publishDate |
2013 |
url |
https://doi.pangaea.de/10.1594/PANGAEA.808783 https://doi.org/10.1594/PANGAEA.808783 |
op_coverage |
LATITUDE: -40.936333 * LONGITUDE: 9.893983 * DATE/TIME START: 1997-12-19T00:00:00 * DATE/TIME END: 1997-12-19T00:00:00 * MINIMUM DEPTH, sediment/rock: 0.00827 m * MAXIMUM DEPTH, sediment/rock: 17.89300 m |
long_lat |
ENVELOPE(9.893983,9.893983,-40.936333,-40.936333) |
genre |
Iceland North Atlantic South Atlantic Ocean |
genre_facet |
Iceland North Atlantic South Atlantic Ocean |
op_source |
Supplement to: Stoner, Joseph S; Channell, James E T; Hodell, David A; Charles, Christopher D (2003): A ~580 kyr paleomagnetic record from the sub-Antarctic South Atlantic (Ocean Drilling Program Site 1089). Journal of Geophysical Research: Solid Earth, 108(B5), 2244, https://doi.org/10.1029/2001JB001390 |
op_relation |
https://doi.pangaea.de/10.1594/PANGAEA.808783 https://doi.org/10.1594/PANGAEA.808783 |
op_rights |
CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.1594/PANGAEA.80878310.1029/2001JB001390 |
_version_ |
1810452269562331136 |