Positioning Paleogene Eurasia problem: Solution for 60-50 Ma and broader tectonic implications
Recently 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 Po...
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Online Access: | https://doi.org/10.1016/j.epsl.2006.09.003 http://hdl.handle.net/10722/151198 |
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ftunivhongkonghu:oai:hub.hku.hk:10722/151198 2023-05-15T16:10:57+02:00 Positioning Paleogene Eurasia problem: Solution for 60-50 Ma and broader tectonic implications Aitchison, JC Ali, JR 2006 https://doi.org/10.1016/j.epsl.2006.09.003 http://hdl.handle.net/10722/151198 eng eng Elsevier BV. The Journal's web site is located at http://www.elsevier.com/locate/epsl Netherlands Earth and Planetary Science Letters http://www.scopus.com/mlt/select.url?eid=2-s2.0-33750369419&selection=ref&src=s&origin=recordpage Earth And Planetary Science Letters, 2006, v. 251 n. 1-2, p. 148-155 doi:10.1016/j.epsl.2006.09.003 155 133640 WOS:000242298500012 0012-821X 1-2 eid_2-s2.0-33750369419 148 http://hdl.handle.net/10722/151198 251 Earth and Planetary Science Letters. Copyright © Elsevier BV. Faroe Sheppey Eurasia Inclination shallowing Tien Shan Paleomagnetic Article 2006 ftunivhongkonghu https://doi.org/10.1016/j.epsl.2006.09.003 2023-01-14T15:43:31Z Recently 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. link_to_subscribed_fulltext Article in Journal/Newspaper Faroe Islands North Pole University of Hong Kong: HKU Scholars Hub Faroe Islands North Pole Earth and Planetary Science Letters 251 1-2 148 155 |
institution |
Open Polar |
collection |
University of Hong Kong: HKU Scholars Hub |
op_collection_id |
ftunivhongkonghu |
language |
English |
topic |
Faroe Sheppey Eurasia Inclination shallowing Tien Shan Paleomagnetic |
spellingShingle |
Faroe Sheppey Eurasia Inclination shallowing Tien Shan Paleomagnetic Aitchison, JC Ali, JR Positioning Paleogene Eurasia problem: Solution for 60-50 Ma and broader tectonic implications |
topic_facet |
Faroe Sheppey Eurasia Inclination shallowing Tien Shan Paleomagnetic |
description |
Recently 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. link_to_subscribed_fulltext |
format |
Article in Journal/Newspaper |
author |
Aitchison, JC Ali, JR |
author_facet |
Aitchison, JC Ali, JR |
author_sort |
Aitchison, JC |
title |
Positioning Paleogene Eurasia problem: Solution for 60-50 Ma and broader tectonic implications |
title_short |
Positioning Paleogene Eurasia problem: Solution for 60-50 Ma and broader tectonic implications |
title_full |
Positioning Paleogene Eurasia problem: Solution for 60-50 Ma and broader tectonic implications |
title_fullStr |
Positioning Paleogene Eurasia problem: Solution for 60-50 Ma and broader tectonic implications |
title_full_unstemmed |
Positioning Paleogene Eurasia problem: Solution for 60-50 Ma and broader tectonic implications |
title_sort |
positioning paleogene eurasia problem: solution for 60-50 ma and broader tectonic implications |
publisher |
Elsevier BV. The Journal's web site is located at http://www.elsevier.com/locate/epsl |
publishDate |
2006 |
url |
https://doi.org/10.1016/j.epsl.2006.09.003 http://hdl.handle.net/10722/151198 |
geographic |
Faroe Islands North Pole |
geographic_facet |
Faroe Islands North Pole |
genre |
Faroe Islands North Pole |
genre_facet |
Faroe Islands North Pole |
op_relation |
Earth and Planetary Science Letters http://www.scopus.com/mlt/select.url?eid=2-s2.0-33750369419&selection=ref&src=s&origin=recordpage Earth And Planetary Science Letters, 2006, v. 251 n. 1-2, p. 148-155 doi:10.1016/j.epsl.2006.09.003 155 133640 WOS:000242298500012 0012-821X 1-2 eid_2-s2.0-33750369419 148 http://hdl.handle.net/10722/151198 251 |
op_rights |
Earth and Planetary Science Letters. Copyright © Elsevier BV. |
op_doi |
https://doi.org/10.1016/j.epsl.2006.09.003 |
container_title |
Earth and Planetary Science Letters |
container_volume |
251 |
container_issue |
1-2 |
container_start_page |
148 |
op_container_end_page |
155 |
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1765996085433597952 |