The Variation of Geomagnetic Field Intensity in Central Anatolia During the Neogene-Quaternary Period
A detailed palaeointensity study was performed using the modified Thellier method on eighteen Quaternary and Neogene volcanic units, ages ranging from 0.08 to 5.98 Ma, in Central Anatolia, Turkey. Robust data, which were estimated from twelve lava units in the study area, significantly increase the...
Published in: | Geophysical Journal International |
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2023
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ftgfzpotsdam:oai:gfzpublic.gfz-potsdam.de:item_5014717 2023-05-15T17:48:12+02:00 The Variation of Geomagnetic Field Intensity in Central Anatolia During the Neogene-Quaternary Period Kaya, N. Hisarlı, Z. Nowaczyk, N. Makaroğlu, Ö. 2023 application/pdf https://gfzpublic.gfz-potsdam.de/pubman/item/item_5014717 https://gfzpublic.gfz-potsdam.de/pubman/item/item_5014717_2/component/file_5015471/5014717.pdf unknown info:eu-repo/semantics/altIdentifier/doi/10.1093/gji/ggad005 https://gfzpublic.gfz-potsdam.de/pubman/item/item_5014717 https://gfzpublic.gfz-potsdam.de/pubman/item/item_5014717_2/component/file_5015471/5014717.pdf info:eu-repo/semantics/openAccess Geophysical Journal International info:eu-repo/semantics/article 2023 ftgfzpotsdam https://doi.org/10.1093/gji/ggad005 2023-02-27T00:34:26Z A detailed palaeointensity study was performed using the modified Thellier method on eighteen Quaternary and Neogene volcanic units, ages ranging from 0.08 to 5.98 Ma, in Central Anatolia, Turkey. Robust data, which were estimated from twelve lava units in the study area, significantly increase the database of palaeomagnetic data, directions, and absolute palaeointensity for the Anatolian region covering the time window back to ∼6 Ma. Previous studies sensitively dated the samples, except for one site dated in this study. The palaeointensity (VDM) value from the upper Miocene site estimated as 48.6 ± 9.2 μT (10.1×1022 ± 1.9 Am2) fits well into the Neogene VDM range in the data archives. For Pliocene samples with an age of 4.7 Ma, the palaeointensity was calculated to be 21.0 ± 4.7 μT. For these samples, an inclination of +42.9° was determined, and together with the results of low palaeointensity and normal polarity, this corresponds to the Nunivak or Sidufjall subchrons. These are normal polarity chrons within the Gilbert Chron which predominantly has reversed polarity. Palaeodirectional data and field strength with age between 0.08-2.57 Ma clearly showed the Brunhes and Matuyama Chrons in the Pleistocene. Three new data with 25.0 ± 7.9 μT (age 1.84 Ma), 59.7 ± 8.2 μT (age 2.15 Ma), and 79.6 ± 19.3 μT (age 2.57 Ma) from the early Pleistocene period significantly contribute to global data archives, which lack palaeointensity data from similar latitude range. The average palaeointensity (VDM) values for nine Pleistocene sites were calculated to be 51.5 ± 16.4 μT (10.3×1022 ± 3.7 Am2). According to the comparison of our data with the palaeointensity database, field model record, and previous studies of the Pleistocene, significantly high field strength obtained from Central Anatolia, located in the northern hemisphere, could have occurred due to asymmetry between the northern and southern hemispheres during the Pleistocene. Article in Journal/Newspaper Nunivak GFZpublic (German Research Centre for Geosciences, Helmholtz-Zentrum Potsdam) Geophysical Journal International |
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Open Polar |
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GFZpublic (German Research Centre for Geosciences, Helmholtz-Zentrum Potsdam) |
op_collection_id |
ftgfzpotsdam |
language |
unknown |
description |
A detailed palaeointensity study was performed using the modified Thellier method on eighteen Quaternary and Neogene volcanic units, ages ranging from 0.08 to 5.98 Ma, in Central Anatolia, Turkey. Robust data, which were estimated from twelve lava units in the study area, significantly increase the database of palaeomagnetic data, directions, and absolute palaeointensity for the Anatolian region covering the time window back to ∼6 Ma. Previous studies sensitively dated the samples, except for one site dated in this study. The palaeointensity (VDM) value from the upper Miocene site estimated as 48.6 ± 9.2 μT (10.1×1022 ± 1.9 Am2) fits well into the Neogene VDM range in the data archives. For Pliocene samples with an age of 4.7 Ma, the palaeointensity was calculated to be 21.0 ± 4.7 μT. For these samples, an inclination of +42.9° was determined, and together with the results of low palaeointensity and normal polarity, this corresponds to the Nunivak or Sidufjall subchrons. These are normal polarity chrons within the Gilbert Chron which predominantly has reversed polarity. Palaeodirectional data and field strength with age between 0.08-2.57 Ma clearly showed the Brunhes and Matuyama Chrons in the Pleistocene. Three new data with 25.0 ± 7.9 μT (age 1.84 Ma), 59.7 ± 8.2 μT (age 2.15 Ma), and 79.6 ± 19.3 μT (age 2.57 Ma) from the early Pleistocene period significantly contribute to global data archives, which lack palaeointensity data from similar latitude range. The average palaeointensity (VDM) values for nine Pleistocene sites were calculated to be 51.5 ± 16.4 μT (10.3×1022 ± 3.7 Am2). According to the comparison of our data with the palaeointensity database, field model record, and previous studies of the Pleistocene, significantly high field strength obtained from Central Anatolia, located in the northern hemisphere, could have occurred due to asymmetry between the northern and southern hemispheres during the Pleistocene. |
format |
Article in Journal/Newspaper |
author |
Kaya, N. Hisarlı, Z. Nowaczyk, N. Makaroğlu, Ö. |
spellingShingle |
Kaya, N. Hisarlı, Z. Nowaczyk, N. Makaroğlu, Ö. The Variation of Geomagnetic Field Intensity in Central Anatolia During the Neogene-Quaternary Period |
author_facet |
Kaya, N. Hisarlı, Z. Nowaczyk, N. Makaroğlu, Ö. |
author_sort |
Kaya, N. |
title |
The Variation of Geomagnetic Field Intensity in Central Anatolia During the Neogene-Quaternary Period |
title_short |
The Variation of Geomagnetic Field Intensity in Central Anatolia During the Neogene-Quaternary Period |
title_full |
The Variation of Geomagnetic Field Intensity in Central Anatolia During the Neogene-Quaternary Period |
title_fullStr |
The Variation of Geomagnetic Field Intensity in Central Anatolia During the Neogene-Quaternary Period |
title_full_unstemmed |
The Variation of Geomagnetic Field Intensity in Central Anatolia During the Neogene-Quaternary Period |
title_sort |
variation of geomagnetic field intensity in central anatolia during the neogene-quaternary period |
publishDate |
2023 |
url |
https://gfzpublic.gfz-potsdam.de/pubman/item/item_5014717 https://gfzpublic.gfz-potsdam.de/pubman/item/item_5014717_2/component/file_5015471/5014717.pdf |
genre |
Nunivak |
genre_facet |
Nunivak |
op_source |
Geophysical Journal International |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1093/gji/ggad005 https://gfzpublic.gfz-potsdam.de/pubman/item/item_5014717 https://gfzpublic.gfz-potsdam.de/pubman/item/item_5014717_2/component/file_5015471/5014717.pdf |
op_rights |
info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.1093/gji/ggad005 |
container_title |
Geophysical Journal International |
_version_ |
1766153462366601216 |