On possible causes of Kargapolovo excursion failure in synchronous section of Polovinka dene from Central Kamchatkan depression
Cover sandy loams (loess-like volcanogenic deposits) were paleomagnetically studied in Central Kamchatkan depression. 457 orientated samples were collected one by one every 10 cm vertically across the section from Kamchatka-river erosion of Polovinka dene (158°55'40"E, 54°54'40"N...
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ftinstvs:oai:repo.kscnet.ru:1015 2023-05-15T16:59:10+02:00 On possible causes of Kargapolovo excursion failure in synchronous section of Polovinka dene from Central Kamchatkan depression Zubov A.G. Kochegura V.V. 2013 http://repo.kscnet.ru/1015/ en eng Tatpoligraph publishing house Zubov A.G. <http://repo.kscnet.ru/view/creators/Zubov=3AA=2EG=2E=3A=3A.html>, Kochegura V.V. <http://repo.kscnet.ru/view/creators/Kochegura=3AV=2EV=2E=3A=3A.html> (2013) On possible causes of Kargapolovo excursion failure in synchronous section of Polovinka dene from Central Kamchatkan depression // International workshop on paleomagnetism and rock magnetism. Book of abstracts. Kazan: Tatpoligraph publishing house. pp. 68. 37.15.31 Постоянное геомагнитное поле и вековые вариации 38.19.27 Палеомагнетизм Статья NonPeerReviewed 2013 ftinstvs 2022-08-09T17:04:22Z Cover sandy loams (loess-like volcanogenic deposits) were paleomagnetically studied in Central Kamchatkan depression. 457 orientated samples were collected one by one every 10 cm vertically across the section from Kamchatka-river erosion of Polovinka dene (158°55'40"E, 54°54'40"N). There are 3 radiocarbon dating in this section. Average sedimentation rate was 1.5 mm/year. Estimated age of studied cover sandy loams is 33-55 Ka. We have tried to compare our resultant paleomagnetic angular records of paleosecular variation (PSV) with the data from well-known Kargapolovo section (Siberia), which is located 77° to the west of Polovinka dene on the same latitude and has the same age. A good correlation was identified between 34-39 Ka age parts of these sections in the shapes of the declination and inclination curves. The similarity was also revealed in the shapes of loops on the D-I stereograms. Such result can be explained by PSV generation from drifting of regional geomagnetic sources in Earth's core along the parallels. But our Polovinka PSV records have no geomagnetic excursion similar to currently accepted as global Kargapolovo one, that is located in the same time range. If we accept Polovinka PSV records synchronous to Kargapolovo geomagnetic excursion as conditioned we have to assume that global distribution of Lashamp-Kargapolovo-Yangiyul excursion is a failure. The lack of geomagnetic excursion in the Polovinka PSV records can be caused by: ♦ wrong regime of magnetic cleaning for some layers, ♦ poor PSV record due to chemical remagnetization in thick layer of buried soil where this event could occur, ♦ water erosion of some sediment layers. Suddenly a similarity was found between a piece of interested Polovinka record and PSV obtained by Averyanov & Melnikov on the lava section from Mutnovsky volcano crater (Kamchatka). On geological data this lava section is 10-26 Ka. But its agreeable place in Polovinka section is situated between layers with radiocarbon dating 38 and 55 Ka. This circumstance resulted ... Text Kamchatka Siberia Institute of Volcanology and Seismology, Petropavlovsk-Kamchatsky: IVS FEB RAS Repository Polovinka ENVELOPE(157.833,157.833,51.721,51.721) |
institution |
Open Polar |
collection |
Institute of Volcanology and Seismology, Petropavlovsk-Kamchatsky: IVS FEB RAS Repository |
op_collection_id |
ftinstvs |
language |
English |
topic |
37.15.31 Постоянное геомагнитное поле и вековые вариации 38.19.27 Палеомагнетизм |
spellingShingle |
37.15.31 Постоянное геомагнитное поле и вековые вариации 38.19.27 Палеомагнетизм Zubov A.G. Kochegura V.V. On possible causes of Kargapolovo excursion failure in synchronous section of Polovinka dene from Central Kamchatkan depression |
topic_facet |
37.15.31 Постоянное геомагнитное поле и вековые вариации 38.19.27 Палеомагнетизм |
description |
Cover sandy loams (loess-like volcanogenic deposits) were paleomagnetically studied in Central Kamchatkan depression. 457 orientated samples were collected one by one every 10 cm vertically across the section from Kamchatka-river erosion of Polovinka dene (158°55'40"E, 54°54'40"N). There are 3 radiocarbon dating in this section. Average sedimentation rate was 1.5 mm/year. Estimated age of studied cover sandy loams is 33-55 Ka. We have tried to compare our resultant paleomagnetic angular records of paleosecular variation (PSV) with the data from well-known Kargapolovo section (Siberia), which is located 77° to the west of Polovinka dene on the same latitude and has the same age. A good correlation was identified between 34-39 Ka age parts of these sections in the shapes of the declination and inclination curves. The similarity was also revealed in the shapes of loops on the D-I stereograms. Such result can be explained by PSV generation from drifting of regional geomagnetic sources in Earth's core along the parallels. But our Polovinka PSV records have no geomagnetic excursion similar to currently accepted as global Kargapolovo one, that is located in the same time range. If we accept Polovinka PSV records synchronous to Kargapolovo geomagnetic excursion as conditioned we have to assume that global distribution of Lashamp-Kargapolovo-Yangiyul excursion is a failure. The lack of geomagnetic excursion in the Polovinka PSV records can be caused by: ♦ wrong regime of magnetic cleaning for some layers, ♦ poor PSV record due to chemical remagnetization in thick layer of buried soil where this event could occur, ♦ water erosion of some sediment layers. Suddenly a similarity was found between a piece of interested Polovinka record and PSV obtained by Averyanov & Melnikov on the lava section from Mutnovsky volcano crater (Kamchatka). On geological data this lava section is 10-26 Ka. But its agreeable place in Polovinka section is situated between layers with radiocarbon dating 38 and 55 Ka. This circumstance resulted ... |
format |
Text |
author |
Zubov A.G. Kochegura V.V. |
author_facet |
Zubov A.G. Kochegura V.V. |
author_sort |
Zubov A.G. |
title |
On possible causes of Kargapolovo excursion failure in synchronous section of Polovinka dene from Central Kamchatkan depression |
title_short |
On possible causes of Kargapolovo excursion failure in synchronous section of Polovinka dene from Central Kamchatkan depression |
title_full |
On possible causes of Kargapolovo excursion failure in synchronous section of Polovinka dene from Central Kamchatkan depression |
title_fullStr |
On possible causes of Kargapolovo excursion failure in synchronous section of Polovinka dene from Central Kamchatkan depression |
title_full_unstemmed |
On possible causes of Kargapolovo excursion failure in synchronous section of Polovinka dene from Central Kamchatkan depression |
title_sort |
on possible causes of kargapolovo excursion failure in synchronous section of polovinka dene from central kamchatkan depression |
publisher |
Tatpoligraph publishing house |
publishDate |
2013 |
url |
http://repo.kscnet.ru/1015/ |
long_lat |
ENVELOPE(157.833,157.833,51.721,51.721) |
geographic |
Polovinka |
geographic_facet |
Polovinka |
genre |
Kamchatka Siberia |
genre_facet |
Kamchatka Siberia |
op_relation |
Zubov A.G. <http://repo.kscnet.ru/view/creators/Zubov=3AA=2EG=2E=3A=3A.html>, Kochegura V.V. <http://repo.kscnet.ru/view/creators/Kochegura=3AV=2EV=2E=3A=3A.html> (2013) On possible causes of Kargapolovo excursion failure in synchronous section of Polovinka dene from Central Kamchatkan depression // International workshop on paleomagnetism and rock magnetism. Book of abstracts. Kazan: Tatpoligraph publishing house. pp. 68. |
_version_ |
1766051373643726848 |