A palaeomagnetic and rock magnetic study of the northern Rajmahal Volcanics, Bihar, India
Identifieur interne : 001273 ( Istex/Corpus ); précédent : 001272; suivant : 001274A palaeomagnetic and rock magnetic study of the northern Rajmahal Volcanics, Bihar, India
Auteurs : Graham J. Sherwood ; S. Basu MallikSource :
- Journal of Southeast Asian Earth Sciences [ 0743-9547 ] ; 1996.
Abstract
A new palaeomagnetic study of mid Cretaceous lavas from 23 localities in the northern part of the Rajmahal Hills gives a mean virtual geomagnetic pole at 10.4°N, 296.6°E, confirming the results of earlier workers. Stepwise thermal and alternating field demagnetisation indicates that 21 out of 23 sites are normally magnetised, whereas two sites in the northwest of the area have recorded two different transitional directions. We have measured the strong-field thermomagnetic behaviour, DC and AC hysteresis parameters, and the variation at low temperature of low-field susceptibility of these and other samples from the Rajmahal Volcanics. These rock magnetic studies reveal that the basaltic lavas contain titanomagnetites which have hardly been oxidised at high temperature, but have undergone low temperature oxidation. The reddened lavas of Gandeswari Hill, on the other hand, show evidence of extensive high temperature deuteric oxidation of titanomagnetite.
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DOI: 10.1016/0743-9547(96)00013-X
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Basu Mallik</name><affiliation><mods:affiliation>Department of Geological Sciences, Jadavpur University, Calcutta 700 032, India</mods:affiliation></affiliation></author></titleStmt><publicationStmt><idno type="wicri:source">ISTEX</idno><idno type="RBID">ISTEX:BB6C20AC61005FADABD82AD089F933A83A2109B0</idno><date when="1996" year="1996">1996</date><idno type="doi">10.1016/0743-9547(96)00013-X</idno><idno type="url">https://api.istex.fr/document/BB6C20AC61005FADABD82AD089F933A83A2109B0/fulltext/pdf</idno><idno type="wicri:Area/Istex/Corpus">001273</idno><idno type="wicri:explorRef" wicri:stream="Istex" wicri:step="Corpus" wicri:corpus="ISTEX">001273</idno></publicationStmt><sourceDesc><biblStruct><analytic><title level="a">A palaeomagnetic and rock magnetic study of the northern Rajmahal Volcanics, Bihar, India</title><author><name sortKey="Sherwood, Graham J" sort="Sherwood, Graham J" uniqKey="Sherwood G" first="Graham J." last="Sherwood">Graham J. Sherwood</name><affiliation><mods:affiliation>School of Biological and Earth Sciences, Liverpool John Moores University, Byrom Street, Liverpool L3 3AF, U.K.</mods:affiliation></affiliation></author><author><name sortKey="Basu Mallik, S" sort="Basu Mallik, S" uniqKey="Basu Mallik S" first="S." last="Basu Mallik">S. Basu Mallik</name><affiliation><mods:affiliation>Department of Geological Sciences, Jadavpur University, Calcutta 700 032, India</mods:affiliation></affiliation></author></analytic><monogr></monogr><series><title level="j">Journal of Southeast Asian Earth Sciences</title><title level="j" type="abbrev">SEAESO</title><idno type="ISSN">0743-9547</idno><imprint><publisher>ELSEVIER</publisher><date type="published" when="1996">1996</date><biblScope unit="volume">13</biblScope><biblScope unit="issue">2</biblScope><biblScope unit="page" from="123">123</biblScope><biblScope unit="page" to="131">131</biblScope></imprint><idno type="ISSN">0743-9547</idno></series><idno type="istex">BB6C20AC61005FADABD82AD089F933A83A2109B0</idno><idno type="DOI">10.1016/0743-9547(96)00013-X</idno><idno type="PII">0743-9547(96)00013-X</idno></biblStruct></sourceDesc><seriesStmt><idno type="ISSN">0743-9547</idno></seriesStmt></fileDesc><profileDesc><textClass></textClass><langUsage><language ident="en">en</language></langUsage></profileDesc></teiHeader><front><div type="abstract" xml:lang="en">A new palaeomagnetic study of mid Cretaceous lavas from 23 localities in the northern part of the Rajmahal Hills gives a mean virtual geomagnetic pole at 10.4°N, 296.6°E, confirming the results of earlier workers. Stepwise thermal and alternating field demagnetisation indicates that 21 out of 23 sites are normally magnetised, whereas two sites in the northwest of the area have recorded two different transitional directions. We have measured the strong-field thermomagnetic behaviour, DC and AC hysteresis parameters, and the variation at low temperature of low-field susceptibility of these and other samples from the Rajmahal Volcanics. These rock magnetic studies reveal that the basaltic lavas contain titanomagnetites which have hardly been oxidised at high temperature, but have undergone low temperature oxidation. The reddened lavas of Gandeswari Hill, on the other hand, show evidence of extensive high temperature deuteric oxidation of titanomagnetite.</div></front></TEI><istex><corpusName>elsevier</corpusName><author><json:item><name>Graham J. Sherwood</name><affiliations><json:string>School of Biological and Earth Sciences, Liverpool John Moores University, Byrom Street, Liverpool L3 3AF, U.K.</json:string></affiliations></json:item><json:item><name>S. Basu Mallik</name><affiliations><json:string>Department of Geological Sciences, Jadavpur University, Calcutta 700 032, India</json:string></affiliations></json:item></author><language><json:string>eng</json:string></language><originalGenre><json:string>Full-length article</json:string></originalGenre><abstract>A new palaeomagnetic study of mid Cretaceous lavas from 23 localities in the northern part of the Rajmahal Hills gives a mean virtual geomagnetic pole at 10.4°N, 296.6°E, confirming the results of earlier workers. Stepwise thermal and alternating field demagnetisation indicates that 21 out of 23 sites are normally magnetised, whereas two sites in the northwest of the area have recorded two different transitional directions. We have measured the strong-field thermomagnetic behaviour, DC and AC hysteresis parameters, and the variation at low temperature of low-field susceptibility of these and other samples from the Rajmahal Volcanics. These rock magnetic studies reveal that the basaltic lavas contain titanomagnetites which have hardly been oxidised at high temperature, but have undergone low temperature oxidation. The reddened lavas of Gandeswari Hill, on the other hand, show evidence of extensive high temperature deuteric oxidation of titanomagnetite.</abstract><qualityIndicators><score>6.362</score><pdfVersion>1.2</pdfVersion><pdfPageSize>590 x 857 pts</pdfPageSize><refBibsNative>true</refBibsNative><keywordCount>0</keywordCount><abstractCharCount>965</abstractCharCount><pdfWordCount>4682</pdfWordCount><pdfCharCount>32263</pdfCharCount><pdfPageCount>9</pdfPageCount><abstractWordCount>140</abstractWordCount></qualityIndicators><title>A palaeomagnetic and rock magnetic study of the northern Rajmahal Volcanics, Bihar, India</title><pii><json:string>0743-9547(96)00013-X</json:string></pii><refBibs><json:item><author><json:item><name>R.N. Athavale</name></json:item><json:item><name>R.K. Verma</name></json:item><json:item><name>M.S. 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Stepwise thermal and alternating field demagnetisation indicates that 21 out of 23 sites are normally magnetised, whereas two sites in the northwest of the area have recorded two different transitional directions. We have measured the strong-field thermomagnetic behaviour, DC and AC hysteresis parameters, and the variation at low temperature of low-field susceptibility of these and other samples from the Rajmahal Volcanics. These rock magnetic studies reveal that the basaltic lavas contain titanomagnetites which have hardly been oxidised at high temperature, but have undergone low temperature oxidation. The reddened lavas of Gandeswari Hill, on the other hand, show evidence of extensive high temperature deuteric oxidation of titanomagnetite.</p></abstract></profileDesc><revisionDesc><change when="1996">Published</change></revisionDesc></teiHeader></istex:fulltextTEI><json:item><extension>txt</extension><original>false</original><mimetype>text/plain</mimetype><uri>https://api.istex.fr/document/BB6C20AC61005FADABD82AD089F933A83A2109B0/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>SEAESO</jid><aid>9600013X</aid><ce:pii>0743-9547(96)00013-X</ce:pii><ce:doi>10.1016/0743-9547(96)00013-X</ce:doi><ce:copyright type="unknown" year="1996"></ce:copyright></item-info><head><ce:title>A palaeomagnetic and rock magnetic study of the northern Rajmahal Volcanics, Bihar, India</ce:title><ce:author-group><ce:author><ce:given-name>Graham J.</ce:given-name><ce:surname>Sherwood</ce:surname><ce:cross-ref refid="AFF1"><ce:sup>∗</ce:sup></ce:cross-ref></ce:author><ce:author><ce:given-name>S.</ce:given-name><ce:surname>Basu Mallik</ce:surname><ce:cross-ref refid="AFF2"><ce:sup>†</ce:sup></ce:cross-ref></ce:author><ce:affiliation id="AFF1"><ce:label>a</ce:label><ce:textfn>School of Biological and Earth Sciences, Liverpool John Moores University, Byrom Street, Liverpool L3 3AF, U.K.</ce:textfn></ce:affiliation><ce:affiliation id="AFF2"><ce:label>b</ce:label><ce:textfn>Department of Geological Sciences, Jadavpur University, Calcutta 700 032, India</ce:textfn></ce:affiliation></ce:author-group><ce:abstract><ce:section-title>Abstract</ce:section-title><ce:abstract-sec><ce:simple-para>A new palaeomagnetic study of mid Cretaceous lavas from 23 localities in the northern part of the Rajmahal Hills gives a mean virtual geomagnetic pole at 10.4°N, 296.6°E, confirming the results of earlier workers. Stepwise thermal and alternating field demagnetisation indicates that 21 out of 23 sites are normally magnetised, whereas two sites in the northwest of the area have recorded two different transitional directions. We have measured the strong-field thermomagnetic behaviour, DC and AC hysteresis parameters, and the variation at low temperature of low-field susceptibility of these and other samples from the Rajmahal Volcanics. These rock magnetic studies reveal that the basaltic lavas contain titanomagnetites which have hardly been oxidised at high temperature, but have undergone low temperature oxidation. The reddened lavas of Gandeswari Hill, on the other hand, show evidence of extensive high temperature deuteric oxidation of titanomagnetite.</ce:simple-para></ce:abstract-sec></ce:abstract></head></converted-article></istex:document></istex:metadataXml><mods version="3.6"><titleInfo><title>A palaeomagnetic and rock magnetic study of the northern Rajmahal Volcanics, Bihar, India</title></titleInfo><titleInfo type="alternative" contentType="CDATA"><title>A palaeomagnetic and rock magnetic study of the northern Rajmahal Volcanics, Bihar, India</title></titleInfo><name type="personal"><namePart type="given">Graham J.</namePart><namePart type="family">Sherwood</namePart><affiliation>School of Biological and Earth Sciences, Liverpool John Moores University, Byrom Street, Liverpool L3 3AF, U.K.</affiliation><role><roleTerm type="text">author</roleTerm></role></name><name type="personal"><namePart type="given">S.</namePart><namePart type="family">Basu Mallik</namePart><affiliation>Department of Geological Sciences, Jadavpur University, Calcutta 700 032, India</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">1996</dateIssued><copyrightDate encoding="w3cdtf">1996</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">A new palaeomagnetic study of mid Cretaceous lavas from 23 localities in the northern part of the Rajmahal Hills gives a mean virtual geomagnetic pole at 10.4°N, 296.6°E, confirming the results of earlier workers. Stepwise thermal and alternating field demagnetisation indicates that 21 out of 23 sites are normally magnetised, whereas two sites in the northwest of the area have recorded two different transitional directions. We have measured the strong-field thermomagnetic behaviour, DC and AC hysteresis parameters, and the variation at low temperature of low-field susceptibility of these and other samples from the Rajmahal Volcanics. These rock magnetic studies reveal that the basaltic lavas contain titanomagnetites which have hardly been oxidised at high temperature, but have undergone low temperature oxidation. The reddened lavas of Gandeswari Hill, on the other hand, show evidence of extensive high temperature deuteric oxidation of titanomagnetite.</abstract><relatedItem type="host"><titleInfo><title>Journal of Southeast Asian Earth Sciences</title></titleInfo><titleInfo type="abbreviated"><title>SEAESO</title></titleInfo><genre type="journal">journal</genre><originInfo><dateIssued encoding="w3cdtf">199602</dateIssued></originInfo><identifier type="ISSN">0743-9547</identifier><identifier type="PII">S0743-9547(00)X0008-6</identifier><part><date>199602</date><detail type="issue"><title>Mesozoic Magmatism of the Eastern Margin of India</title></detail><detail type="volume"><number>13</number><caption>vol.</caption></detail><detail type="issue"><number>2</number><caption>no.</caption></detail><extent unit="issue pages"><start>73</start><end>158</end></extent><extent unit="pages"><start>123</start><end>131</end></extent></part></relatedItem><identifier type="istex">BB6C20AC61005FADABD82AD089F933A83A2109B0</identifier><identifier type="DOI">10.1016/0743-9547(96)00013-X</identifier><identifier type="PII">0743-9547(96)00013-X</identifier><recordInfo><recordContentSource>ELSEVIER</recordContentSource></recordInfo></mods></metadata></istex></record>Pour manipuler ce document sous Unix (Dilib)
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