(Table 2) U-channel paleomagnetic record of ODP Site 178-1098
Thick Holocene sedimentary sections (>45 m) cored in the Palmer Deep by the United States Antarctic Program (USAP) and during Ocean Drilling Program (ODP) Leg 178 provide the first opportunity to examine past geomagnetic field behavior at high southern latitudes. After removal of a low-coercivity...
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ftpangaea:oai:pangaea.de:doi:10.1594/PANGAEA.723108 2023-05-15T13:41:32+02:00 (Table 2) U-channel paleomagnetic record of ODP Site 178-1098 Brachfeld, Stefanie A Acton, Gary D Guyodo, Yohan Banerjee, Subir K LATITUDE: -64.861950 * LONGITUDE: -64.207883 * DATE/TIME START: 1998-03-09T00:00:00 * DATE/TIME END: 1998-03-09T00:00:00 * MINIMUM DEPTH, sediment/rock: 1.09 m * MAXIMUM DEPTH, sediment/rock: 22.57 m 2000-06-29 text/tab-separated-values, 15456 data points https://doi.pangaea.de/10.1594/PANGAEA.723108 https://doi.org/10.1594/PANGAEA.723108 en eng PANGAEA https://doi.pangaea.de/10.1594/PANGAEA.723108 https://doi.org/10.1594/PANGAEA.723108 CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess CC-BY Supplement to: Brachfeld, Stefanie A; Acton, Gary D; Guyodo, Yohan; Banerjee, Subir K (2000): High-resolution paleomagnetic records from Holocene sediments from the Palmer Deep, Western Antartic Peninsula. Earth and Planetary Science Letters, 181(3), 429-441, https://doi.org/10.1016/S0012-821X(00)00211-9 178-1098 AGE COMPCORE Composite Core Depth composite sediment/rock Drake Passage DSDP/ODP/IODP sample designation Joides Resolution Leg178 Maximum angular deviation NRM Declination Inclination Intensity median destructive field of natural remanent magnetization alternating field Ocean Drilling Program ODP Paleointensity J(NRM)/J(SIRM) Sample code/label Dataset 2000 ftpangaea https://doi.org/10.1594/PANGAEA.723108 https://doi.org/10.1016/S0012-821X(00)00211-9 2023-01-20T08:48:54Z Thick Holocene sedimentary sections (>45 m) cored in the Palmer Deep by the United States Antarctic Program (USAP) and during Ocean Drilling Program (ODP) Leg 178 provide the first opportunity to examine past geomagnetic field behavior at high southern latitudes. After removal of a low-coercivity drilling overprint the sediments display a stable, single-component remanent magnetization. Two short cores that recovered the uppermost 2.6 m of sediment have inclinations that fluctuate about the present day inclination (-57°) measured at Faraday Station, and several features with wavelengths of 10 to 20 cm appear to be correlative. However, shipboard measurements of inclination fluctuations on split-core samples from three holes drilled at ODP Site 1098 do not correlate well with each other, even though the intensity and susceptibility data correlate very well and the overall mean inclination for cores from each hole is consistent with the expected geocentric axial dipole (GAD) inclination. The correlation is improved dramatically by using inclinations measured on u-channels taken from the pristine center of a split core. Consequently, the anomalous directions and the resulting poor between-hole correlation of inclinations obtained from shipboard data can be attributed to coring-induced deformation, which is common on the outer edge of ODP piston cores, and/or measurement artifacts in the split-core data. Our preferred inclination record is thus derived from u-channel results. The upper ~25 m represents continuous sedimentation over the past 9000 yr, with an average sedimentation rate exceeding 250 cm/kyr (0.25 cm/yr). Given that remanence measurements on u-channels average over an interval <7 cm long, we obtained independent measurements of the paleo-geomagnetic field that average over only ~30 yr. This high-resolution record is characterized by an inclination that fluctuates within +/-15° of the current GAD inclination. Dataset Antarc* Antarctic Drake Passage United States Antarctic Program PANGAEA - Data Publisher for Earth & Environmental Science Antarctic Drake Passage Faraday ENVELOPE(-64.256,-64.256,-65.246,-65.246) Palmer Deep ENVELOPE(-64.400,-64.400,-64.950,-64.950) ENVELOPE(-64.207883,-64.207883,-64.861950,-64.861950) |
institution |
Open Polar |
collection |
PANGAEA - Data Publisher for Earth & Environmental Science |
op_collection_id |
ftpangaea |
language |
English |
topic |
178-1098 AGE COMPCORE Composite Core Depth composite sediment/rock Drake Passage DSDP/ODP/IODP sample designation Joides Resolution Leg178 Maximum angular deviation NRM Declination Inclination Intensity median destructive field of natural remanent magnetization alternating field Ocean Drilling Program ODP Paleointensity J(NRM)/J(SIRM) Sample code/label |
spellingShingle |
178-1098 AGE COMPCORE Composite Core Depth composite sediment/rock Drake Passage DSDP/ODP/IODP sample designation Joides Resolution Leg178 Maximum angular deviation NRM Declination Inclination Intensity median destructive field of natural remanent magnetization alternating field Ocean Drilling Program ODP Paleointensity J(NRM)/J(SIRM) Sample code/label Brachfeld, Stefanie A Acton, Gary D Guyodo, Yohan Banerjee, Subir K (Table 2) U-channel paleomagnetic record of ODP Site 178-1098 |
topic_facet |
178-1098 AGE COMPCORE Composite Core Depth composite sediment/rock Drake Passage DSDP/ODP/IODP sample designation Joides Resolution Leg178 Maximum angular deviation NRM Declination Inclination Intensity median destructive field of natural remanent magnetization alternating field Ocean Drilling Program ODP Paleointensity J(NRM)/J(SIRM) Sample code/label |
description |
Thick Holocene sedimentary sections (>45 m) cored in the Palmer Deep by the United States Antarctic Program (USAP) and during Ocean Drilling Program (ODP) Leg 178 provide the first opportunity to examine past geomagnetic field behavior at high southern latitudes. After removal of a low-coercivity drilling overprint the sediments display a stable, single-component remanent magnetization. Two short cores that recovered the uppermost 2.6 m of sediment have inclinations that fluctuate about the present day inclination (-57°) measured at Faraday Station, and several features with wavelengths of 10 to 20 cm appear to be correlative. However, shipboard measurements of inclination fluctuations on split-core samples from three holes drilled at ODP Site 1098 do not correlate well with each other, even though the intensity and susceptibility data correlate very well and the overall mean inclination for cores from each hole is consistent with the expected geocentric axial dipole (GAD) inclination. The correlation is improved dramatically by using inclinations measured on u-channels taken from the pristine center of a split core. Consequently, the anomalous directions and the resulting poor between-hole correlation of inclinations obtained from shipboard data can be attributed to coring-induced deformation, which is common on the outer edge of ODP piston cores, and/or measurement artifacts in the split-core data. Our preferred inclination record is thus derived from u-channel results. The upper ~25 m represents continuous sedimentation over the past 9000 yr, with an average sedimentation rate exceeding 250 cm/kyr (0.25 cm/yr). Given that remanence measurements on u-channels average over an interval <7 cm long, we obtained independent measurements of the paleo-geomagnetic field that average over only ~30 yr. This high-resolution record is characterized by an inclination that fluctuates within +/-15° of the current GAD inclination. |
format |
Dataset |
author |
Brachfeld, Stefanie A Acton, Gary D Guyodo, Yohan Banerjee, Subir K |
author_facet |
Brachfeld, Stefanie A Acton, Gary D Guyodo, Yohan Banerjee, Subir K |
author_sort |
Brachfeld, Stefanie A |
title |
(Table 2) U-channel paleomagnetic record of ODP Site 178-1098 |
title_short |
(Table 2) U-channel paleomagnetic record of ODP Site 178-1098 |
title_full |
(Table 2) U-channel paleomagnetic record of ODP Site 178-1098 |
title_fullStr |
(Table 2) U-channel paleomagnetic record of ODP Site 178-1098 |
title_full_unstemmed |
(Table 2) U-channel paleomagnetic record of ODP Site 178-1098 |
title_sort |
(table 2) u-channel paleomagnetic record of odp site 178-1098 |
publisher |
PANGAEA |
publishDate |
2000 |
url |
https://doi.pangaea.de/10.1594/PANGAEA.723108 https://doi.org/10.1594/PANGAEA.723108 |
op_coverage |
LATITUDE: -64.861950 * LONGITUDE: -64.207883 * DATE/TIME START: 1998-03-09T00:00:00 * DATE/TIME END: 1998-03-09T00:00:00 * MINIMUM DEPTH, sediment/rock: 1.09 m * MAXIMUM DEPTH, sediment/rock: 22.57 m |
long_lat |
ENVELOPE(-64.256,-64.256,-65.246,-65.246) ENVELOPE(-64.400,-64.400,-64.950,-64.950) ENVELOPE(-64.207883,-64.207883,-64.861950,-64.861950) |
geographic |
Antarctic Drake Passage Faraday Palmer Deep |
geographic_facet |
Antarctic Drake Passage Faraday Palmer Deep |
genre |
Antarc* Antarctic Drake Passage United States Antarctic Program |
genre_facet |
Antarc* Antarctic Drake Passage United States Antarctic Program |
op_source |
Supplement to: Brachfeld, Stefanie A; Acton, Gary D; Guyodo, Yohan; Banerjee, Subir K (2000): High-resolution paleomagnetic records from Holocene sediments from the Palmer Deep, Western Antartic Peninsula. Earth and Planetary Science Letters, 181(3), 429-441, https://doi.org/10.1016/S0012-821X(00)00211-9 |
op_relation |
https://doi.pangaea.de/10.1594/PANGAEA.723108 https://doi.org/10.1594/PANGAEA.723108 |
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.723108 https://doi.org/10.1016/S0012-821X(00)00211-9 |
_version_ |
1766151917814153216 |