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Amplitude of Secular Geomagnetic Variation in Late Cretaceous Based on Paleomagnetic Studies of the Okhotsk–Chukotka Volcanic Belt from Upper Reaches of Malyi Anyui River, West Chukotka
—A paleomagnetic study of the Okhotsk–Chukotka belt volcanics exposed in the region of the Kupol field (~66.9° N, 170.1° E) has been carried out. The studied rocks were formed between 85 and 95 Ma during the Cretaceous Normal Superchron (CNS). In most of the studied samples, the characteristic magne...
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Published in: | Izvestiya. Physics of the solid earth 2022-04, Vol.58 (2), p.185-202 |
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description | —A paleomagnetic study of the Okhotsk–Chukotka belt volcanics exposed in the region of the Kupol field (~66.9° N, 170.1° E) has been carried out. The studied rocks were formed between 85 and 95 Ma during the Cretaceous Normal Superchron (CNS). In most of the studied samples, the characteristic magnetization component is isolated. Its primary origin is supported by the positive fold test, magnetic mineralogy data, and similarity of the calculated paleomagnetic pole with that of coeval rocks from the same region. It is shown that the studied rocks were formed in high polar latitudes close to 80° N. The amplitude of paleosecular variation (PSV) of the geomagnetic field during CNS has been estimated. Depending on the calculation method, the estimates (and their confidence intervals) for ~81° N are
Sb
= 22.1° (19.5°; 24.7°) in case of using a fixed cut-off angle of 45° and
Sb
= 23.1° (20.3°; 25.7°) in case of the cut-off angle calculated by the Vandamme method. The obtained estimates generally support the existing models of PSV latitudinal dependence for CNS. At the same time, the estimates are less consistent with the model (McFadden et al., 1991) where PSV values are low at the equator and sharply increase with latitude than with the model (Biggin et al., 2008) predicting higher PSV values at the equator and their more gentle increase towards polar latitudes. Irrespective of the calculation method, the obtained estimates almost perfectly fit the PSV latitudinal dependences for the last 5 Ma. This means that the amplitude of secular geomagnetic variation during CNS, at least at high latitudes, was the same as it was during the last 5 Ma. The obtained result does not support the hypothesis that geodynamo regimes change at the transition from the periods of frequent geomagnetic reversals to superchrons (e.g., (Gallet and Pavlov, 2016)), which suggests, in particular, that the modern numerical models are not fully adequate to the real processes of generation of the geomagnetic field. |
doi_str_mv | 10.1134/S1069351322020045 |
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Sb
= 22.1° (19.5°; 24.7°) in case of using a fixed cut-off angle of 45° and
Sb
= 23.1° (20.3°; 25.7°) in case of the cut-off angle calculated by the Vandamme method. The obtained estimates generally support the existing models of PSV latitudinal dependence for CNS. At the same time, the estimates are less consistent with the model (McFadden et al., 1991) where PSV values are low at the equator and sharply increase with latitude than with the model (Biggin et al., 2008) predicting higher PSV values at the equator and their more gentle increase towards polar latitudes. Irrespective of the calculation method, the obtained estimates almost perfectly fit the PSV latitudinal dependences for the last 5 Ma. This means that the amplitude of secular geomagnetic variation during CNS, at least at high latitudes, was the same as it was during the last 5 Ma. The obtained result does not support the hypothesis that geodynamo regimes change at the transition from the periods of frequent geomagnetic reversals to superchrons (e.g., (Gallet and Pavlov, 2016)), which suggests, in particular, that the modern numerical models are not fully adequate to the real processes of generation of the geomagnetic field.</description><identifier>ISSN: 1069-3513</identifier><identifier>EISSN: 1555-6506</identifier><identifier>DOI: 10.1134/S1069351322020045</identifier><language>eng</language><publisher>Moscow: Pleiades Publishing</publisher><subject>Amplitude ; Amplitudes ; Belts ; Confidence intervals ; Cretaceous ; Dynamo theory ; Earth and Environmental Science ; Earth Sciences ; Equator ; Estimates ; Geomagnetic field ; Geomagnetism ; Geophysics/Geodesy ; Latitude ; Magnetic reversals ; Mathematical models ; Mineralogy ; Modelling ; Numerical models ; Palaeomagnetism ; Paleomagnetic studies ; Paleomagnetism ; Rock ; Rocks ; Volcanic belts</subject><ispartof>Izvestiya. Physics of the solid earth, 2022-04, Vol.58 (2), p.185-202</ispartof><rights>Pleiades Publishing, Ltd. 2022. ISSN 1069-3513, Izvestiya, Physics of the Solid Earth, 2022, Vol. 58, No. 2, pp. 185–202. © Pleiades Publishing, Ltd., 2022. Russian Text © The Author(s), 2022, published in Fizika Zemli, 2022, No. 2, pp. 41–59.</rights><lds50>peer_reviewed</lds50><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-a339t-3da43bdc6c8f4c5a34080bb85c355b2278c5d5a11a423a3c0442691d97e33c6a3</citedby><cites>FETCH-LOGICAL-a339t-3da43bdc6c8f4c5a34080bb85c355b2278c5d5a11a423a3c0442691d97e33c6a3</cites></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><link.rule.ids>314,780,784,27924,27925</link.rule.ids></links><search><creatorcontrib>Lebedev, I. E.</creatorcontrib><creatorcontrib>Bobrovnikova, E. M.</creatorcontrib><creatorcontrib>Tikhomirov, P. L.</creatorcontrib><creatorcontrib>Eid, B.</creatorcontrib><creatorcontrib>Lhuillier, F.</creatorcontrib><creatorcontrib>Pavlov, V. E.</creatorcontrib><title>Amplitude of Secular Geomagnetic Variation in Late Cretaceous Based on Paleomagnetic Studies of the Okhotsk–Chukotka Volcanic Belt from Upper Reaches of Malyi Anyui River, West Chukotka</title><title>Izvestiya. Physics of the solid earth</title><addtitle>Izv., Phys. Solid Earth</addtitle><description>—A paleomagnetic study of the Okhotsk–Chukotka belt volcanics exposed in the region of the Kupol field (~66.9° N, 170.1° E) has been carried out. The studied rocks were formed between 85 and 95 Ma during the Cretaceous Normal Superchron (CNS). In most of the studied samples, the characteristic magnetization component is isolated. Its primary origin is supported by the positive fold test, magnetic mineralogy data, and similarity of the calculated paleomagnetic pole with that of coeval rocks from the same region. It is shown that the studied rocks were formed in high polar latitudes close to 80° N. The amplitude of paleosecular variation (PSV) of the geomagnetic field during CNS has been estimated. Depending on the calculation method, the estimates (and their confidence intervals) for ~81° N are
Sb
= 22.1° (19.5°; 24.7°) in case of using a fixed cut-off angle of 45° and
Sb
= 23.1° (20.3°; 25.7°) in case of the cut-off angle calculated by the Vandamme method. The obtained estimates generally support the existing models of PSV latitudinal dependence for CNS. At the same time, the estimates are less consistent with the model (McFadden et al., 1991) where PSV values are low at the equator and sharply increase with latitude than with the model (Biggin et al., 2008) predicting higher PSV values at the equator and their more gentle increase towards polar latitudes. Irrespective of the calculation method, the obtained estimates almost perfectly fit the PSV latitudinal dependences for the last 5 Ma. This means that the amplitude of secular geomagnetic variation during CNS, at least at high latitudes, was the same as it was during the last 5 Ma. The obtained result does not support the hypothesis that geodynamo regimes change at the transition from the periods of frequent geomagnetic reversals to superchrons (e.g., (Gallet and Pavlov, 2016)), which suggests, in particular, that the modern numerical models are not fully adequate to the real processes of generation of the geomagnetic field.</description><subject>Amplitude</subject><subject>Amplitudes</subject><subject>Belts</subject><subject>Confidence intervals</subject><subject>Cretaceous</subject><subject>Dynamo theory</subject><subject>Earth and Environmental Science</subject><subject>Earth Sciences</subject><subject>Equator</subject><subject>Estimates</subject><subject>Geomagnetic field</subject><subject>Geomagnetism</subject><subject>Geophysics/Geodesy</subject><subject>Latitude</subject><subject>Magnetic reversals</subject><subject>Mathematical models</subject><subject>Mineralogy</subject><subject>Modelling</subject><subject>Numerical models</subject><subject>Palaeomagnetism</subject><subject>Paleomagnetic studies</subject><subject>Paleomagnetism</subject><subject>Rock</subject><subject>Rocks</subject><subject>Volcanic belts</subject><issn>1069-3513</issn><issn>1555-6506</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2022</creationdate><recordtype>article</recordtype><recordid>eNp1kctO3DAUhqOqSKXQB-juSGwJ-BJnkuUwKhdpEIgpdBmdcU4YM5k4tR2k2fEOPA5v0yepR1NUJMTKlv7_-3zkkyTfOTviXGbHM87yUiouhWCCsUx9Sna5UirNFcs_x3uM003-Jfnq_UNsZLIsd5OX8apvTRhqAtvAjPTQooMzsiu87ygYDXfoDAZjOzAdTDEQTBwF1GQHDyfoqYaYXWP7hplFoSG_UYYFwdVyYYNf_nl6niyGpQ1LhDvbauxi9YTaAI2zK7jte3JwQ6gXW_QS27WBcbceDNyYR3KH8It8gFfJfrLTYOvp279zL7k9_fFzcp5Or84uJuNpilKWIZU1ZnJe61wXTaYVyowVbD4vlJZKzYUYFVrVCjnHTEiUOn6NyEtelyOSUuco95KDrbd39vcQJ6ge7OC6-GQl8ixXo6LgKrb4tqWd9d5RU_XOrNCtK86qzY6qdzuKjNgyPna7e3L_zR9DfwGDgJYU</recordid><startdate>20220401</startdate><enddate>20220401</enddate><creator>Lebedev, I. E.</creator><creator>Bobrovnikova, E. M.</creator><creator>Tikhomirov, P. L.</creator><creator>Eid, B.</creator><creator>Lhuillier, F.</creator><creator>Pavlov, V. E.</creator><general>Pleiades Publishing</general><general>Springer Nature B.V</general><scope>AAYXX</scope><scope>CITATION</scope><scope>7TG</scope><scope>8FD</scope><scope>F1W</scope><scope>FR3</scope><scope>H8D</scope><scope>H96</scope><scope>KL.</scope><scope>KR7</scope><scope>L.G</scope><scope>L7M</scope></search><sort><creationdate>20220401</creationdate><title>Amplitude of Secular Geomagnetic Variation in Late Cretaceous Based on Paleomagnetic Studies of the Okhotsk–Chukotka Volcanic Belt from Upper Reaches of Malyi Anyui River, West Chukotka</title><author>Lebedev, I. E. ; Bobrovnikova, E. M. ; Tikhomirov, P. L. ; Eid, B. ; Lhuillier, F. ; Pavlov, V. E.</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-a339t-3da43bdc6c8f4c5a34080bb85c355b2278c5d5a11a423a3c0442691d97e33c6a3</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2022</creationdate><topic>Amplitude</topic><topic>Amplitudes</topic><topic>Belts</topic><topic>Confidence intervals</topic><topic>Cretaceous</topic><topic>Dynamo theory</topic><topic>Earth and Environmental Science</topic><topic>Earth Sciences</topic><topic>Equator</topic><topic>Estimates</topic><topic>Geomagnetic field</topic><topic>Geomagnetism</topic><topic>Geophysics/Geodesy</topic><topic>Latitude</topic><topic>Magnetic reversals</topic><topic>Mathematical models</topic><topic>Mineralogy</topic><topic>Modelling</topic><topic>Numerical models</topic><topic>Palaeomagnetism</topic><topic>Paleomagnetic studies</topic><topic>Paleomagnetism</topic><topic>Rock</topic><topic>Rocks</topic><topic>Volcanic belts</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Lebedev, I. E.</creatorcontrib><creatorcontrib>Bobrovnikova, E. M.</creatorcontrib><creatorcontrib>Tikhomirov, P. L.</creatorcontrib><creatorcontrib>Eid, B.</creatorcontrib><creatorcontrib>Lhuillier, F.</creatorcontrib><creatorcontrib>Pavlov, V. E.</creatorcontrib><collection>CrossRef</collection><collection>Meteorological & Geoastrophysical Abstracts</collection><collection>Technology Research Database</collection><collection>ASFA: Aquatic Sciences and Fisheries Abstracts</collection><collection>Engineering Research Database</collection><collection>Aerospace Database</collection><collection>Aquatic Science & Fisheries Abstracts (ASFA) 2: Ocean Technology, Policy & Non-Living Resources</collection><collection>Meteorological & Geoastrophysical Abstracts - Academic</collection><collection>Civil Engineering Abstracts</collection><collection>Aquatic Science & Fisheries Abstracts (ASFA) Professional</collection><collection>Advanced Technologies Database with Aerospace</collection><jtitle>Izvestiya. Physics of the solid earth</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Lebedev, I. E.</au><au>Bobrovnikova, E. M.</au><au>Tikhomirov, P. L.</au><au>Eid, B.</au><au>Lhuillier, F.</au><au>Pavlov, V. E.</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Amplitude of Secular Geomagnetic Variation in Late Cretaceous Based on Paleomagnetic Studies of the Okhotsk–Chukotka Volcanic Belt from Upper Reaches of Malyi Anyui River, West Chukotka</atitle><jtitle>Izvestiya. Physics of the solid earth</jtitle><stitle>Izv., Phys. Solid Earth</stitle><date>2022-04-01</date><risdate>2022</risdate><volume>58</volume><issue>2</issue><spage>185</spage><epage>202</epage><pages>185-202</pages><issn>1069-3513</issn><eissn>1555-6506</eissn><abstract>—A paleomagnetic study of the Okhotsk–Chukotka belt volcanics exposed in the region of the Kupol field (~66.9° N, 170.1° E) has been carried out. The studied rocks were formed between 85 and 95 Ma during the Cretaceous Normal Superchron (CNS). In most of the studied samples, the characteristic magnetization component is isolated. Its primary origin is supported by the positive fold test, magnetic mineralogy data, and similarity of the calculated paleomagnetic pole with that of coeval rocks from the same region. It is shown that the studied rocks were formed in high polar latitudes close to 80° N. The amplitude of paleosecular variation (PSV) of the geomagnetic field during CNS has been estimated. Depending on the calculation method, the estimates (and their confidence intervals) for ~81° N are
Sb
= 22.1° (19.5°; 24.7°) in case of using a fixed cut-off angle of 45° and
Sb
= 23.1° (20.3°; 25.7°) in case of the cut-off angle calculated by the Vandamme method. The obtained estimates generally support the existing models of PSV latitudinal dependence for CNS. At the same time, the estimates are less consistent with the model (McFadden et al., 1991) where PSV values are low at the equator and sharply increase with latitude than with the model (Biggin et al., 2008) predicting higher PSV values at the equator and their more gentle increase towards polar latitudes. Irrespective of the calculation method, the obtained estimates almost perfectly fit the PSV latitudinal dependences for the last 5 Ma. This means that the amplitude of secular geomagnetic variation during CNS, at least at high latitudes, was the same as it was during the last 5 Ma. The obtained result does not support the hypothesis that geodynamo regimes change at the transition from the periods of frequent geomagnetic reversals to superchrons (e.g., (Gallet and Pavlov, 2016)), which suggests, in particular, that the modern numerical models are not fully adequate to the real processes of generation of the geomagnetic field.</abstract><cop>Moscow</cop><pub>Pleiades Publishing</pub><doi>10.1134/S1069351322020045</doi><tpages>18</tpages></addata></record> |
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subjects | Amplitude Amplitudes Belts Confidence intervals Cretaceous Dynamo theory Earth and Environmental Science Earth Sciences Equator Estimates Geomagnetic field Geomagnetism Geophysics/Geodesy Latitude Magnetic reversals Mathematical models Mineralogy Modelling Numerical models Palaeomagnetism Paleomagnetic studies Paleomagnetism Rock Rocks Volcanic belts |
title | Amplitude of Secular Geomagnetic Variation in Late Cretaceous Based on Paleomagnetic Studies of the Okhotsk–Chukotka Volcanic Belt from Upper Reaches of Malyi Anyui River, West Chukotka |
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