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Article: First Palaeogene sedimentary rock palaeomagnetic pole from stable western Eurasia and tectonic implications

TitleFirst Palaeogene sedimentary rock palaeomagnetic pole from stable western Eurasia and tectonic implications
Authors
KeywordsEocene
Eurasia
London City Formation
North Atlantic Igneous Province
Palaeomagnetism
Shallow Inclinations
Issue Date2003
PublisherBlackwell Publishing Ltd. The Journal's web site is located at http://www.blackwellpublishing.com/journals/GJI
Citation
Geophysical Journal International, 2003, v. 154 n. 2, p. 463-470 How to Cite?
AbstractA palaeomagnetic investigation of lower Eocene (ca. 52 Ma) London Clay Formation cemented mudstones from Sheppey (SE England) has yielded a mean direction of Dec. = 1.1°, Inc. = 43.2°, where N = 9, α95 = 6.8° and K = 58.5. This apparently high-quality direction (Q-factor = 5) has an associated palaeopole of 178.6°E, 63.7°N, where A95 = 6.8°. The data represent the first pole from post Jurassic stable Eurasia rocks outside of the European North Atlantic Igneous Province (NAIP), of which most results have been obtained from NW Britain and the Faroe Islands. The data can in part be used to constrain the position of Palaeogene Eurasia, in particular the zero-offset declination implying negligible rotation of western Eurasia since the early Cenozoic. This is in contrast with data derived from the European NAIP, which imply small to moderate clockwise rotations for this part of the plate. The inclination angle may provide less useful information as it appears to be anomalously shallow when compared with that associated with the NAIP derived poles. In an attempt to understand the shallowing, we re-examined data from Palaeocene-Eocene sediments recovered in several boreholes (bathyal sediments in DSDP Hole 550, four cores through fluvio-delatic to middle shelf sequences in the London area, and one borehole sequence from East Anglia). In all cases, the sediments show systematic inclination shallowing similar in magnitude to that reported from Sheppey. Tectonic and geomagnetic explanations can be discounted; sediment compaction appears to be the likely cause. In light of the current controversy surrounding the 'stable Asia shallow inclination problem', the result reinforces the suggestion that tectonic modelling needs to be done carefully when the supporting data are based exclusively on palaeomagnetic studies of sedimentary rocks.
Persistent Identifierhttp://hdl.handle.net/10722/151105
ISSN
2015 Impact Factor: 2.484
2015 SCImago Journal Rankings: 1.839
ISI Accession Number ID
References

 

DC FieldValueLanguage
dc.contributor.authorAli, JRen_US
dc.contributor.authorWard, DJen_US
dc.contributor.authorKing, Cen_US
dc.contributor.authorAbrajevitch, Aen_US
dc.date.accessioned2012-06-26T06:17:07Z-
dc.date.available2012-06-26T06:17:07Z-
dc.date.issued2003en_US
dc.identifier.citationGeophysical Journal International, 2003, v. 154 n. 2, p. 463-470en_US
dc.identifier.issn0956-540Xen_US
dc.identifier.urihttp://hdl.handle.net/10722/151105-
dc.description.abstractA palaeomagnetic investigation of lower Eocene (ca. 52 Ma) London Clay Formation cemented mudstones from Sheppey (SE England) has yielded a mean direction of Dec. = 1.1°, Inc. = 43.2°, where N = 9, α95 = 6.8° and K = 58.5. This apparently high-quality direction (Q-factor = 5) has an associated palaeopole of 178.6°E, 63.7°N, where A95 = 6.8°. The data represent the first pole from post Jurassic stable Eurasia rocks outside of the European North Atlantic Igneous Province (NAIP), of which most results have been obtained from NW Britain and the Faroe Islands. The data can in part be used to constrain the position of Palaeogene Eurasia, in particular the zero-offset declination implying negligible rotation of western Eurasia since the early Cenozoic. This is in contrast with data derived from the European NAIP, which imply small to moderate clockwise rotations for this part of the plate. The inclination angle may provide less useful information as it appears to be anomalously shallow when compared with that associated with the NAIP derived poles. In an attempt to understand the shallowing, we re-examined data from Palaeocene-Eocene sediments recovered in several boreholes (bathyal sediments in DSDP Hole 550, four cores through fluvio-delatic to middle shelf sequences in the London area, and one borehole sequence from East Anglia). In all cases, the sediments show systematic inclination shallowing similar in magnitude to that reported from Sheppey. Tectonic and geomagnetic explanations can be discounted; sediment compaction appears to be the likely cause. In light of the current controversy surrounding the 'stable Asia shallow inclination problem', the result reinforces the suggestion that tectonic modelling needs to be done carefully when the supporting data are based exclusively on palaeomagnetic studies of sedimentary rocks.en_US
dc.languageengen_US
dc.publisherBlackwell Publishing Ltd. The Journal's web site is located at http://www.blackwellpublishing.com/journals/GJIen_US
dc.relation.ispartofGeophysical Journal Internationalen_US
dc.rightsGeophysical Journal International. Copyright © Blackwell Publishing Ltd.-
dc.subjectEoceneen_US
dc.subjectEurasiaen_US
dc.subjectLondon City Formationen_US
dc.subjectNorth Atlantic Igneous Provinceen_US
dc.subjectPalaeomagnetismen_US
dc.subjectShallow Inclinationsen_US
dc.titleFirst Palaeogene sedimentary rock palaeomagnetic pole from stable western Eurasia and tectonic implicationsen_US
dc.typeArticleen_US
dc.identifier.emailAli, JR: jrali@hku.hken_US
dc.identifier.authorityAli, JR=rp00659en_US
dc.description.naturelink_to_subscribed_fulltexten_US
dc.identifier.doi10.1046/j.1365-246X.2003.01974.xen_US
dc.identifier.scopuseid_2-s2.0-0042123663en_US
dc.identifier.hkuros90890-
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-0042123663&selection=ref&src=s&origin=recordpageen_US
dc.identifier.volume154en_US
dc.identifier.issue2en_US
dc.identifier.spage463en_US
dc.identifier.epage470en_US
dc.identifier.isiWOS:000184266700013-
dc.publisher.placeUnited Kingdomen_US
dc.identifier.scopusauthoridAli, JR=7102266465en_US
dc.identifier.scopusauthoridWard, DJ=17344364700en_US
dc.identifier.scopusauthoridKing, C=7401525600en_US
dc.identifier.scopusauthoridAbrajevitch, A=6505932976en_US

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