Susceptibility measured on 18 sediment cores from METEOR cruise M134/1
Sediment magnetic properties are determined by the speciation, concentration and grain‐size range of the sedimentary iron mineral assemblage and mirror both, sediment lithology and diagenesis. As geochemical redox reactions involving iron, methane and other types of organic matter were a major issue...
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PANGAEA
2020
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Online Access: | https://doi.pangaea.de/10.1594/PANGAEA.914649 https://doi.org/10.1594/PANGAEA.914649 |
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ftpangaea:oai:pangaea.de:doi:10.1594/PANGAEA.914649 |
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openpolar |
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Open Polar |
collection |
PANGAEA - Data Publisher for Earth & Environmental Science |
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ftpangaea |
language |
English |
topic |
Center for Marine Environmental Sciences M134/1 magnetic susceptibility MARUM South Georgia Island |
spellingShingle |
Center for Marine Environmental Sciences M134/1 magnetic susceptibility MARUM South Georgia Island von Dobeneck, Tilo Susceptibility measured on 18 sediment cores from METEOR cruise M134/1 |
topic_facet |
Center for Marine Environmental Sciences M134/1 magnetic susceptibility MARUM South Georgia Island |
description |
Sediment magnetic properties are determined by the speciation, concentration and grain‐size range of the sedimentary iron mineral assemblage and mirror both, sediment lithology and diagenesis. As geochemical redox reactions involving iron, methane and other types of organic matter were a major issue of Cruise M134/1 to South Georgia Island, magnetic methodology has been routinely applied to all collected sediment series. All opened GC and DAPC cores were investigated for changes in magnetic susceptibility at 2 cm resolution, using a hand‐bench suitable for horizontal full‐ or half‐core logging. Magnetic volume susceptibility κ is the most commonly measured rock magnetic parameter in geoscience and describes how strongly a material is magnetized by a small and alternating external magnetic field (κ = dM/dH with volume magnetization M and magnetizing field H). κ primarily reflects the concentration of lithogenic or authigenic ferrimagnetic iron minerals while paramagnetic minerals such as iron‐bearing silicates have lesser influence except in Fe oxide depleted sediments. Diamagnetic matrix mineral (calcite, quartz, opal) and pore water content (i.e. porosity) all dilute the magnetic mineral fraction and reduce the bulk magnetic volume susceptibility accordingly. On this cruise, magnetic susceptibility was exceptionally measured on a self‐built, hand‐operated roller bench onto which a new BARTINGTON 140 mm loop sensor connected to a MS‐3 control unit was mounted (cycling time set to 5 sec). The sensor's sensitivity extends over an interval (half‐width) of ~8 cm. Consequently, sharp susceptibility changes appear smoothed in the core log and thin, magnetically contrasting layers are not appropriately resolved. Each segment was separately logged at 2 cm intervals with 10 cm extensions to both sides. Start and end data were used to assess and compensate the instrumental temperature drift. A volume correction for core diameter and full or split core data was applied. The systematic decline of the susceptibility signal ... |
format |
Dataset |
author |
von Dobeneck, Tilo |
author_facet |
von Dobeneck, Tilo |
author_sort |
von Dobeneck, Tilo |
title |
Susceptibility measured on 18 sediment cores from METEOR cruise M134/1 |
title_short |
Susceptibility measured on 18 sediment cores from METEOR cruise M134/1 |
title_full |
Susceptibility measured on 18 sediment cores from METEOR cruise M134/1 |
title_fullStr |
Susceptibility measured on 18 sediment cores from METEOR cruise M134/1 |
title_full_unstemmed |
Susceptibility measured on 18 sediment cores from METEOR cruise M134/1 |
title_sort |
susceptibility measured on 18 sediment cores from meteor cruise m134/1 |
publisher |
PANGAEA |
publishDate |
2020 |
url |
https://doi.pangaea.de/10.1594/PANGAEA.914649 https://doi.org/10.1594/PANGAEA.914649 |
op_coverage |
MEDIAN LATITUDE: -54.200856 * MEDIAN LONGITUDE: -37.391001 * SOUTH-BOUND LATITUDE: -54.814520 * WEST-BOUND LONGITUDE: -38.177770 * NORTH-BOUND LATITUDE: -53.745080 * EAST-BOUND LONGITUDE: -35.842100 * DATE/TIME START: 2017-01-21T08:18:00 * DATE/TIME END: 2017-02-09T14:45:00 |
long_lat |
ENVELOPE(-36.750,-36.750,-54.250,-54.250) ENVELOPE(-38.177770,-35.842100,-53.745080,-54.814520) |
geographic |
South Georgia Island |
geographic_facet |
South Georgia Island |
genre |
South Georgia Island |
genre_facet |
South Georgia Island |
op_relation |
Bohrmann, Gerhard; Aromokeye, Adeyemi David; Bihler, Viola; Dehning, Klaus; Dohrmann, Ingrid; Gentz, Torben; Grahs, M; Hogg, O; Hüttich, Daniel; Kasten, Sabine; Kirschenmann, E; Lange, Mirko; Leymann, Tom; Linse, Katrin; Loher, Markus; Malnati, Janice; Mau, Susan; Mickoleit, Anett; Nowald, Nicolas; Pape, Thomas; Reuter, Christian; Römer, Miriam; Sahling, Heiko; Stange, Nikolas; Torres, Marta E; Vittori, Vincent; von Dobeneck, Tilo; von Neuhoff, Holger; Weinrebe, Reimer Wilhelm; Wintersteller, Paul (2017): R/V METEOR Cruise Report M134, Emissions of Free Gas from Cross-Shelf Troughs of South Georgia: Distribution, Quantification, and Sources for Methane Ebullition Sites in Sub-Antarctic Waters, Port Stanley (Falkland Islands) - Punta Arenas (Chile), 16 January - 18 February 2017. Berichte aus dem MARUM und dem Fachbereich Geowissenschaften der Universität Bremen, 317, 220 pp, urn:nbn:de:gbv:46-00106081-12 https://doi.pangaea.de/10.1594/PANGAEA.914649 https://doi.org/10.1594/PANGAEA.914649 |
op_rights |
CC-BY-4.0: Creative Commons Attribution 4.0 International Access constraints: unrestricted info:eu-repo/semantics/openAccess |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.1594/PANGAEA.914649 |
_version_ |
1766200780186976256 |
spelling |
ftpangaea:oai:pangaea.de:doi:10.1594/PANGAEA.914649 2023-05-15T18:21:29+02:00 Susceptibility measured on 18 sediment cores from METEOR cruise M134/1 von Dobeneck, Tilo MEDIAN LATITUDE: -54.200856 * MEDIAN LONGITUDE: -37.391001 * SOUTH-BOUND LATITUDE: -54.814520 * WEST-BOUND LONGITUDE: -38.177770 * NORTH-BOUND LATITUDE: -53.745080 * EAST-BOUND LONGITUDE: -35.842100 * DATE/TIME START: 2017-01-21T08:18:00 * DATE/TIME END: 2017-02-09T14:45:00 2020-04-09 application/zip, 18 datasets https://doi.pangaea.de/10.1594/PANGAEA.914649 https://doi.org/10.1594/PANGAEA.914649 en eng PANGAEA Bohrmann, Gerhard; Aromokeye, Adeyemi David; Bihler, Viola; Dehning, Klaus; Dohrmann, Ingrid; Gentz, Torben; Grahs, M; Hogg, O; Hüttich, Daniel; Kasten, Sabine; Kirschenmann, E; Lange, Mirko; Leymann, Tom; Linse, Katrin; Loher, Markus; Malnati, Janice; Mau, Susan; Mickoleit, Anett; Nowald, Nicolas; Pape, Thomas; Reuter, Christian; Römer, Miriam; Sahling, Heiko; Stange, Nikolas; Torres, Marta E; Vittori, Vincent; von Dobeneck, Tilo; von Neuhoff, Holger; Weinrebe, Reimer Wilhelm; Wintersteller, Paul (2017): R/V METEOR Cruise Report M134, Emissions of Free Gas from Cross-Shelf Troughs of South Georgia: Distribution, Quantification, and Sources for Methane Ebullition Sites in Sub-Antarctic Waters, Port Stanley (Falkland Islands) - Punta Arenas (Chile), 16 January - 18 February 2017. Berichte aus dem MARUM und dem Fachbereich Geowissenschaften der Universität Bremen, 317, 220 pp, urn:nbn:de:gbv:46-00106081-12 https://doi.pangaea.de/10.1594/PANGAEA.914649 https://doi.org/10.1594/PANGAEA.914649 CC-BY-4.0: Creative Commons Attribution 4.0 International Access constraints: unrestricted info:eu-repo/semantics/openAccess CC-BY Center for Marine Environmental Sciences M134/1 magnetic susceptibility MARUM South Georgia Island Dataset 2020 ftpangaea https://doi.org/10.1594/PANGAEA.914649 2023-01-20T07:34:31Z Sediment magnetic properties are determined by the speciation, concentration and grain‐size range of the sedimentary iron mineral assemblage and mirror both, sediment lithology and diagenesis. As geochemical redox reactions involving iron, methane and other types of organic matter were a major issue of Cruise M134/1 to South Georgia Island, magnetic methodology has been routinely applied to all collected sediment series. All opened GC and DAPC cores were investigated for changes in magnetic susceptibility at 2 cm resolution, using a hand‐bench suitable for horizontal full‐ or half‐core logging. Magnetic volume susceptibility κ is the most commonly measured rock magnetic parameter in geoscience and describes how strongly a material is magnetized by a small and alternating external magnetic field (κ = dM/dH with volume magnetization M and magnetizing field H). κ primarily reflects the concentration of lithogenic or authigenic ferrimagnetic iron minerals while paramagnetic minerals such as iron‐bearing silicates have lesser influence except in Fe oxide depleted sediments. Diamagnetic matrix mineral (calcite, quartz, opal) and pore water content (i.e. porosity) all dilute the magnetic mineral fraction and reduce the bulk magnetic volume susceptibility accordingly. On this cruise, magnetic susceptibility was exceptionally measured on a self‐built, hand‐operated roller bench onto which a new BARTINGTON 140 mm loop sensor connected to a MS‐3 control unit was mounted (cycling time set to 5 sec). The sensor's sensitivity extends over an interval (half‐width) of ~8 cm. Consequently, sharp susceptibility changes appear smoothed in the core log and thin, magnetically contrasting layers are not appropriately resolved. Each segment was separately logged at 2 cm intervals with 10 cm extensions to both sides. Start and end data were used to assess and compensate the instrumental temperature drift. A volume correction for core diameter and full or split core data was applied. The systematic decline of the susceptibility signal ... Dataset South Georgia Island PANGAEA - Data Publisher for Earth & Environmental Science South Georgia Island ENVELOPE(-36.750,-36.750,-54.250,-54.250) ENVELOPE(-38.177770,-35.842100,-53.745080,-54.814520) |