Climatic and geomagnetic influences on the Lac du Bouchet palaeomagnetic SV record through the last 110 000 years
Identifieur interne : 001702 ( Istex/Corpus ); précédent : 001701; suivant : 001703Climatic and geomagnetic influences on the Lac du Bouchet palaeomagnetic SV record through the last 110 000 years
Auteurs : K. M. Creer ; N. Thouveny ; I. BlunkSource :
- Physics of the Earth and Planetary Interiors [ 0031-9201 ] ; 1990.
Abstract
Palaeomagnetic secular variation records stacked from five cores ∼ 20 m long extend back through the last glacial cycle to ∼ 100 000 years ago. The time-scale has been constructed from conventional and accelerator radiocarbon ages back to ∼ 45 Ka BP and beyond this by comprehensive pollen studies which identify forest and steppe cycles that have been related to marine oxygen isotopic stages 4 and 5. Spectral analyses of the intensity and directional records using both Fourier and maximum entropy methods reveal strong low-frequency components which fall in the range of the Milankovitch obliquity and precession periodicities (40-20 Ka). It is concluded that although part of this signal may have fed indirectly into the natural remanence via the influence of climatic change on sediment facies, part has been impressed directly by perturbation of the geomagnetic dynamo process at the core-boundary by variations in the Earth's obliquity and precession. These long periods envelop a well-defined pattern, registered also by the independent ‘Mackereth’ core stack back to 50 Ka BP, of irregular secular oscillations of the geodynamo with periods of a few thousands of years.
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DOI: 10.1016/0031-9201(90)90046-Z
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The time-scale has been constructed from conventional and accelerator radiocarbon ages back to ∼ 45 Ka BP and beyond this by comprehensive pollen studies which identify forest and steppe cycles that have been related to marine oxygen isotopic stages 4 and 5. Spectral analyses of the intensity and directional records using both Fourier and maximum entropy methods reveal strong low-frequency components which fall in the range of the Milankovitch obliquity and precession periodicities (40-20 Ka). It is concluded that although part of this signal may have fed indirectly into the natural remanence via the influence of climatic change on sediment facies, part has been impressed directly by perturbation of the geomagnetic dynamo process at the core-boundary by variations in the Earth's obliquity and precession. These long periods envelop a well-defined pattern, registered also by the independent ‘Mackereth’ core stack back to 50 Ka BP, of irregular secular oscillations of the geodynamo with periods of a few thousands of years.</div></front></TEI><istex><corpusName>elsevier</corpusName><author><json:item><name>K.M. Creer</name><affiliations><json:string>Department of Geology and Geophysics, University of Edinburgh, Edinburgh EH9 3JZ U.K.</json:string></affiliations></json:item><json:item><name>N. Thouveny</name><affiliations><json:string>CNRS Laboratoire de Geologie du Quaternaire, Marseille France</json:string></affiliations></json:item><json:item><name>I. Blunk</name><affiliations><json:string>Department of Geology and Geophysics, University of Edinburgh, Edinburgh EH9 3JZ U.K.</json:string></affiliations></json:item></author><language><json:string>eng</json:string></language><originalGenre><json:string>Full-length article</json:string></originalGenre><abstract>Palaeomagnetic secular variation records stacked from five cores ∼ 20 m long extend back through the last glacial cycle to ∼ 100 000 years ago. The time-scale has been constructed from conventional and accelerator radiocarbon ages back to ∼ 45 Ka BP and beyond this by comprehensive pollen studies which identify forest and steppe cycles that have been related to marine oxygen isotopic stages 4 and 5. Spectral analyses of the intensity and directional records using both Fourier and maximum entropy methods reveal strong low-frequency components which fall in the range of the Milankovitch obliquity and precession periodicities (40-20 Ka). It is concluded that although part of this signal may have fed indirectly into the natural remanence via the influence of climatic change on sediment facies, part has been impressed directly by perturbation of the geomagnetic dynamo process at the core-boundary by variations in the Earth's obliquity and precession. 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The time-scale has been constructed from conventional and accelerator radiocarbon ages back to ∼ 45 Ka BP and beyond this by comprehensive pollen studies which identify forest and steppe cycles that have been related to marine oxygen isotopic stages 4 and 5. Spectral analyses of the intensity and directional records using both Fourier and maximum entropy methods reveal strong low-frequency components which fall in the range of the Milankovitch obliquity and precession periodicities (40-20 Ka). It is concluded that although part of this signal may have fed indirectly into the natural remanence via the influence of climatic change on sediment facies, part has been impressed directly by perturbation of the geomagnetic dynamo process at the core-boundary by variations in the Earth's obliquity and precession. These long periods envelop a well-defined pattern, registered also by the independent ‘Mackereth’ core stack back to 50 Ka BP, of irregular secular oscillations of the geodynamo with periods of a few thousands of years.</p></abstract></profileDesc><revisionDesc><change when="1990">Published</change></revisionDesc></teiHeader></istex:fulltextTEI><json:item><extension>txt</extension><original>false</original><mimetype>text/plain</mimetype><uri>https://api.istex.fr/document/C72F910913BFE21E35A3308B443F9027F90F2E2B/fulltext/txt</uri></json:item></fulltext><metadata><istex:metadataXml wicri:clean="Elsevier, elements deleted: tail"><istex:xmlDeclaration>version="1.0" encoding="utf-8"</istex:xmlDeclaration><istex:docType PUBLIC="-//ES//DTD journal article DTD version 4.5.2//EN//XML" URI="art452.dtd" name="istex:docType"></istex:docType><istex:document><converted-article version="4.5.2" docsubtype="fla"><item-info><jid>PEPI</jid><aid>9090046Z</aid><ce:pii>0031-9201(90)90046-Z</ce:pii><ce:doi>10.1016/0031-9201(90)90046-Z</ce:doi><ce:copyright type="unknown" year="1990"></ce:copyright></item-info><head><ce:title>Climatic and geomagnetic influences on the Lac du Bouchet palaeomagnetic SV record through the last 110 000 years</ce:title><ce:author-group><ce:author><ce:given-name>K.M.</ce:given-name><ce:surname>Creer</ce:surname><ce:cross-ref refid="AFF1"><ce:sup>1</ce:sup></ce:cross-ref></ce:author><ce:author><ce:given-name>N.</ce:given-name><ce:surname>Thouveny</ce:surname><ce:cross-ref refid="AFF2"><ce:sup>2</ce:sup></ce:cross-ref></ce:author><ce:author><ce:given-name>I.</ce:given-name><ce:surname>Blunk</ce:surname><ce:cross-ref refid="AFF1"><ce:sup>1</ce:sup></ce:cross-ref></ce:author><ce:affiliation id="AFF1"><ce:label>1</ce:label><ce:textfn>Department of Geology and Geophysics, University of Edinburgh, Edinburgh EH9 3JZ U.K.</ce:textfn></ce:affiliation><ce:affiliation id="AFF2"><ce:label>2</ce:label><ce:textfn>CNRS Laboratoire de Geologie du Quaternaire, Marseille France</ce:textfn></ce:affiliation></ce:author-group><ce:date-accepted day="12" month="6" year="1990"></ce:date-accepted><ce:abstract><ce:section-title>Abstract</ce:section-title><ce:abstract-sec><ce:simple-para>Palaeomagnetic secular variation records stacked from five cores ∼ 20 m long extend back through the last glacial cycle to ∼ 100 000 years ago. The time-scale has been constructed from conventional and accelerator radiocarbon ages back to ∼ 45 Ka BP and beyond this by comprehensive pollen studies which identify forest and steppe cycles that have been related to marine oxygen isotopic stages 4 and 5. Spectral analyses of the intensity and directional records using both Fourier and maximum entropy methods reveal strong low-frequency components which fall in the range of the Milankovitch obliquity and precession periodicities (40-20 Ka). It is concluded that although part of this signal may have fed indirectly into the natural remanence via the influence of climatic change on sediment facies, part has been impressed directly by perturbation of the geomagnetic dynamo process at the core-boundary by variations in the Earth's obliquity and precession. These long periods envelop a well-defined pattern, registered also by the independent ‘Mackereth’ core stack back to 50 Ka BP, of irregular secular oscillations of the geodynamo with periods of a few thousands of years.</ce:simple-para></ce:abstract-sec></ce:abstract></head></converted-article></istex:document></istex:metadataXml><mods version="3.6"><titleInfo><title>Climatic and geomagnetic influences on the Lac du Bouchet palaeomagnetic SV record through the last 110 000 years</title></titleInfo><titleInfo type="alternative" contentType="CDATA"><title>Climatic and geomagnetic influences on the Lac du Bouchet palaeomagnetic SV record through the last 110 000 years</title></titleInfo><name type="personal"><namePart type="given">K.M.</namePart><namePart type="family">Creer</namePart><affiliation>Department of Geology and Geophysics, University of Edinburgh, Edinburgh EH9 3JZ U.K.</affiliation><role><roleTerm type="text">author</roleTerm></role></name><name type="personal"><namePart type="given">N.</namePart><namePart type="family">Thouveny</namePart><affiliation>CNRS Laboratoire de Geologie du Quaternaire, Marseille France</affiliation><role><roleTerm type="text">author</roleTerm></role></name><name type="personal"><namePart type="given">I.</namePart><namePart type="family">Blunk</namePart><affiliation>Department of Geology and Geophysics, University of Edinburgh, Edinburgh EH9 3JZ U.K.</affiliation><role><roleTerm type="text">author</roleTerm></role></name><typeOfResource>text</typeOfResource><genre type="research-article" displayLabel="Full-length article"></genre><originInfo><publisher>ELSEVIER</publisher><dateIssued encoding="w3cdtf">1990</dateIssued><copyrightDate encoding="w3cdtf">1990</copyrightDate></originInfo><language><languageTerm type="code" authority="iso639-2b">eng</languageTerm><languageTerm type="code" authority="rfc3066">en</languageTerm></language><physicalDescription><internetMediaType>text/html</internetMediaType></physicalDescription><abstract lang="en">Palaeomagnetic secular variation records stacked from five cores ∼ 20 m long extend back through the last glacial cycle to ∼ 100 000 years ago. The time-scale has been constructed from conventional and accelerator radiocarbon ages back to ∼ 45 Ka BP and beyond this by comprehensive pollen studies which identify forest and steppe cycles that have been related to marine oxygen isotopic stages 4 and 5. Spectral analyses of the intensity and directional records using both Fourier and maximum entropy methods reveal strong low-frequency components which fall in the range of the Milankovitch obliquity and precession periodicities (40-20 Ka). It is concluded that although part of this signal may have fed indirectly into the natural remanence via the influence of climatic change on sediment facies, part has been impressed directly by perturbation of the geomagnetic dynamo process at the core-boundary by variations in the Earth's obliquity and precession. These long periods envelop a well-defined pattern, registered also by the independent ‘Mackereth’ core stack back to 50 Ka BP, of irregular secular oscillations of the geodynamo with periods of a few thousands of years.</abstract><relatedItem type="host"><titleInfo><title>Physics of the Earth and Planetary Interiors</title></titleInfo><titleInfo type="abbreviated"><title>PEPI</title></titleInfo><genre type="journal">journal</genre><originInfo><dateIssued encoding="w3cdtf">19901201</dateIssued></originInfo><identifier type="ISSN">0031-9201</identifier><identifier type="PII">S0031-9201(00)X0304-4</identifier><part><date>19901201</date><detail type="volume"><number>64</number><caption>vol.</caption></detail><detail type="issue"><number>2–4</number><caption>no.</caption></detail><extent unit="issue pages"><start>111</start><end>368</end></extent><extent unit="pages"><start>314</start><end>341</end></extent></part></relatedItem><identifier type="istex">C72F910913BFE21E35A3308B443F9027F90F2E2B</identifier><identifier type="DOI">10.1016/0031-9201(90)90046-Z</identifier><identifier type="PII">0031-9201(90)90046-Z</identifier><recordInfo><recordContentSource>ELSEVIER</recordContentSource></recordInfo></mods></metadata></istex></record>Pour manipuler ce document sous Unix (Dilib)
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