High-resolution palaeomagnetic record from Sea of Marmara sediments for the last 70 ka
Magnetostratigraphic and geochemical analyses were performed on two sediment cores recovered from the Sea of Marmara to investigate geomagnetic field variations over the last 70 ka. A chronology for each of the two cores was developed from eight AMS 14C datings, tephrochronology, and tuning of Ca co...
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ftgfzpotsdam:oai:gfzpublic.gfz-potsdam.de:item_5002190 2023-05-15T16:29:54+02:00 High-resolution palaeomagnetic record from Sea of Marmara sediments for the last 70 ka Makaroğlu, Ö. Nowaczyk, N. Eriş, K. Çağatay, M. 2020 application/pdf https://gfzpublic.gfz-potsdam.de/pubman/item/item_5002190 https://gfzpublic.gfz-potsdam.de/pubman/item/item_5002190_3/component/file_5002535/5002190.pdf unknown info:eu-repo/semantics/altIdentifier/doi/10.1093/gji/ggaa281 https://gfzpublic.gfz-potsdam.de/pubman/item/item_5002190 https://gfzpublic.gfz-potsdam.de/pubman/item/item_5002190_3/component/file_5002535/5002190.pdf info:eu-repo/semantics/openAccess Geophysical Journal International info:eu-repo/semantics/article 2020 ftgfzpotsdam https://doi.org/10.1093/gji/ggaa281 2022-09-14T05:57:28Z Magnetostratigraphic and geochemical analyses were performed on two sediment cores recovered from the Sea of Marmara to investigate geomagnetic field variations over the last 70 ka. A chronology for each of the two cores was developed from eight AMS 14C datings, tephrochronology, and tuning of Ca concentrations with stadials and interstadials observed in Greenland ice core oxygen isotope data. Based on the age models, cores MD01–2430 and MRS-CS19 reach back to 70 ka and 32 ka, respectively. High average sedimentation rates of 43 cm/kyr for core MD01–2430 and 68 cm/kyr for core MRS-CS19 allow high-resolution reconstruction of geomagnetic field variations for the Sea of Marmara. Mineral magnetic properties are sensitive to glacioeustatic sea-level changes and palaeoclimate variations in this region, reflecting the variable palaeoenvironmental conditions of the Sea of Marmara during last 70 ka. Despite the impairment of the palaeomagnetic record in some stratigraphic intervals due to early diagenesis, relative palaeointensity variations in the Sea of Marmara sediments correlate well with similar records derived from other regions, such as the nearby Black Sea and the GLOPIS-75 stack. The directional record derived from the Sea of Marmara cores exhibits typical palaeosecular variation patterns, with directional anomalies at 41 ka and 18 ka, representing the Laschamps and postulated Hilina Pali excursions, respectively. Both directional anomalies are also associated with palaeointensity minima. A further palaeointensity minimum at 34.5 ka is likely related to the Mono Lake excursion, with no directional deviation documented in the Sea of Marmara palaeomagnetic record so far. Article in Journal/Newspaper Greenland Greenland ice core ice core GFZpublic (German Research Centre for Geosciences, Helmholtz-Zentrum Potsdam) Greenland Geophysical Journal International 222 3 2024 2039 |
institution |
Open Polar |
collection |
GFZpublic (German Research Centre for Geosciences, Helmholtz-Zentrum Potsdam) |
op_collection_id |
ftgfzpotsdam |
language |
unknown |
description |
Magnetostratigraphic and geochemical analyses were performed on two sediment cores recovered from the Sea of Marmara to investigate geomagnetic field variations over the last 70 ka. A chronology for each of the two cores was developed from eight AMS 14C datings, tephrochronology, and tuning of Ca concentrations with stadials and interstadials observed in Greenland ice core oxygen isotope data. Based on the age models, cores MD01–2430 and MRS-CS19 reach back to 70 ka and 32 ka, respectively. High average sedimentation rates of 43 cm/kyr for core MD01–2430 and 68 cm/kyr for core MRS-CS19 allow high-resolution reconstruction of geomagnetic field variations for the Sea of Marmara. Mineral magnetic properties are sensitive to glacioeustatic sea-level changes and palaeoclimate variations in this region, reflecting the variable palaeoenvironmental conditions of the Sea of Marmara during last 70 ka. Despite the impairment of the palaeomagnetic record in some stratigraphic intervals due to early diagenesis, relative palaeointensity variations in the Sea of Marmara sediments correlate well with similar records derived from other regions, such as the nearby Black Sea and the GLOPIS-75 stack. The directional record derived from the Sea of Marmara cores exhibits typical palaeosecular variation patterns, with directional anomalies at 41 ka and 18 ka, representing the Laschamps and postulated Hilina Pali excursions, respectively. Both directional anomalies are also associated with palaeointensity minima. A further palaeointensity minimum at 34.5 ka is likely related to the Mono Lake excursion, with no directional deviation documented in the Sea of Marmara palaeomagnetic record so far. |
format |
Article in Journal/Newspaper |
author |
Makaroğlu, Ö. Nowaczyk, N. Eriş, K. Çağatay, M. |
spellingShingle |
Makaroğlu, Ö. Nowaczyk, N. Eriş, K. Çağatay, M. High-resolution palaeomagnetic record from Sea of Marmara sediments for the last 70 ka |
author_facet |
Makaroğlu, Ö. Nowaczyk, N. Eriş, K. Çağatay, M. |
author_sort |
Makaroğlu, Ö. |
title |
High-resolution palaeomagnetic record from Sea of Marmara sediments for the last 70 ka |
title_short |
High-resolution palaeomagnetic record from Sea of Marmara sediments for the last 70 ka |
title_full |
High-resolution palaeomagnetic record from Sea of Marmara sediments for the last 70 ka |
title_fullStr |
High-resolution palaeomagnetic record from Sea of Marmara sediments for the last 70 ka |
title_full_unstemmed |
High-resolution palaeomagnetic record from Sea of Marmara sediments for the last 70 ka |
title_sort |
high-resolution palaeomagnetic record from sea of marmara sediments for the last 70 ka |
publishDate |
2020 |
url |
https://gfzpublic.gfz-potsdam.de/pubman/item/item_5002190 https://gfzpublic.gfz-potsdam.de/pubman/item/item_5002190_3/component/file_5002535/5002190.pdf |
geographic |
Greenland |
geographic_facet |
Greenland |
genre |
Greenland Greenland ice core ice core |
genre_facet |
Greenland Greenland ice core ice core |
op_source |
Geophysical Journal International |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1093/gji/ggaa281 https://gfzpublic.gfz-potsdam.de/pubman/item/item_5002190 https://gfzpublic.gfz-potsdam.de/pubman/item/item_5002190_3/component/file_5002535/5002190.pdf |
op_rights |
info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.1093/gji/ggaa281 |
container_title |
Geophysical Journal International |
container_volume |
222 |
container_issue |
3 |
container_start_page |
2024 |
op_container_end_page |
2039 |
_version_ |
1766019609039732736 |