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Article: Positioning Paleogene Eurasia problem: Solution for 60-50 Ma and broader tectonic implications

TitlePositioning Paleogene Eurasia problem: Solution for 60-50 Ma and broader tectonic implications
Authors
KeywordsEurasia
Faroe
Inclination shallowing
Paleomagnetic
Sheppey
Tien Shan
Issue Date2006
PublisherElsevier BV. The Journal's web site is located at http://www.elsevier.com/locate/epsl
Citation
Earth And Planetary Science Letters, 2006, v. 251 n. 1-2, p. 148-155 How to Cite?
AbstractRecently published paleomagnetic data from the Faroe Islands and SE England have enabled a "hybrid" pole (72.0°N, 177.9°E, A95 = 7.9°) to be calculated for "stable" Eurasia ∼ 55 Ma. It is somewhat different to previous proposals, being a further 8-9° from the present-day North Pole. A strong positive test of the new pole is provided by 2002-published paleomagnetic data from basaltic rocks in the Tien Shan range in Kyrgyzstan: the paleolatitude derived from the inclination angle matches the predicted value to within 0.2°. An unfortunate drawback with Kyrgyzstan pole is its large age error: ± 15 m.y. for rocks estimated to have formed ∼ 50 Ma. Fortuitously, an alternative test is now available using paleomagnetic data from Paleocene basalts in the Tien Shan range of western China, for which a robust radiometric age-date (59 ± 1 Ma, based on two Ar-Ar results) also exists. Although the locality has experienced a large vertical-axis rotation, the mean declination being 54.5°, the inclination angle appears undisturbed, and the derived paleolatitude matches the value predicted by hybrid pole to within 4.0°. Thus, it is contended, the Faroe-Sheppey pole provides one of the most reliable means of fixing Eurasia's position for the interval 60-50 Ma. It also impacts on various model proposals for the India-Asia collision and subsequent crustal shortening and/or extrusion between southern Tibet and stable Eurasia (north of the Tien Shan). © 2006 Elsevier B.V. All rights reserved.
Persistent Identifierhttp://hdl.handle.net/10722/151198
ISSN
2015 Impact Factor: 4.326
2015 SCImago Journal Rankings: 3.628
ISI Accession Number ID
References

 

DC FieldValueLanguage
dc.contributor.authorAli, JRen_HK
dc.contributor.authorAitchison, JCen_HK
dc.date.accessioned2012-06-26T06:18:32Z-
dc.date.available2012-06-26T06:18:32Z-
dc.date.issued2006en_HK
dc.identifier.citationEarth And Planetary Science Letters, 2006, v. 251 n. 1-2, p. 148-155en_HK
dc.identifier.issn0012-821Xen_HK
dc.identifier.urihttp://hdl.handle.net/10722/151198-
dc.description.abstractRecently published paleomagnetic data from the Faroe Islands and SE England have enabled a "hybrid" pole (72.0°N, 177.9°E, A95 = 7.9°) to be calculated for "stable" Eurasia ∼ 55 Ma. It is somewhat different to previous proposals, being a further 8-9° from the present-day North Pole. A strong positive test of the new pole is provided by 2002-published paleomagnetic data from basaltic rocks in the Tien Shan range in Kyrgyzstan: the paleolatitude derived from the inclination angle matches the predicted value to within 0.2°. An unfortunate drawback with Kyrgyzstan pole is its large age error: ± 15 m.y. for rocks estimated to have formed ∼ 50 Ma. Fortuitously, an alternative test is now available using paleomagnetic data from Paleocene basalts in the Tien Shan range of western China, for which a robust radiometric age-date (59 ± 1 Ma, based on two Ar-Ar results) also exists. Although the locality has experienced a large vertical-axis rotation, the mean declination being 54.5°, the inclination angle appears undisturbed, and the derived paleolatitude matches the value predicted by hybrid pole to within 4.0°. Thus, it is contended, the Faroe-Sheppey pole provides one of the most reliable means of fixing Eurasia's position for the interval 60-50 Ma. It also impacts on various model proposals for the India-Asia collision and subsequent crustal shortening and/or extrusion between southern Tibet and stable Eurasia (north of the Tien Shan). © 2006 Elsevier B.V. All rights reserved.en_HK
dc.languageengen_US
dc.publisherElsevier BV. The Journal's web site is located at http://www.elsevier.com/locate/epslen_HK
dc.relation.ispartofEarth and Planetary Science Lettersen_HK
dc.rightsEarth and Planetary Science Letters. Copyright © Elsevier BV.-
dc.subjectEurasiaen_HK
dc.subjectFaroeen_HK
dc.subjectInclination shallowingen_HK
dc.subjectPaleomagneticen_HK
dc.subjectSheppeyen_HK
dc.subjectTien Shanen_HK
dc.titlePositioning Paleogene Eurasia problem: Solution for 60-50 Ma and broader tectonic implicationsen_HK
dc.typeArticleen_HK
dc.identifier.emailAli, JR: jrali@hku.hken_HK
dc.identifier.emailAitchison, JC: jona@hku.hken_HK
dc.identifier.authorityAli, JR=rp00659en_HK
dc.identifier.authorityAitchison, JC=rp00658en_HK
dc.description.naturelink_to_subscribed_fulltexten_US
dc.identifier.doi10.1016/j.epsl.2006.09.003en_HK
dc.identifier.scopuseid_2-s2.0-33750369419en_HK
dc.identifier.hkuros133640-
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-33750369419&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume251en_HK
dc.identifier.issue1-2en_HK
dc.identifier.spage148en_HK
dc.identifier.epage155en_HK
dc.identifier.isiWOS:000242298500012-
dc.publisher.placeNetherlandsen_HK
dc.identifier.scopusauthoridAli, JR=7102266465en_HK
dc.identifier.scopusauthoridAitchison, JC=7102533858en_HK

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