First Palaeogene sedimentary rock palaeomagnetic pole from stable western Eurasia and tectonic implications
A 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 palae...
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ftunivhongkonghu:oai:hub.hku.hk:10722/151105 2023-05-15T16:11:02+02:00 First Palaeogene sedimentary rock palaeomagnetic pole from stable western Eurasia and tectonic implications King, C Abrajevitch, A Ali, JR Ward, DJ 2003 https://doi.org/10.1046/j.1365-246X.2003.01974.x http://hdl.handle.net/10722/151105 eng eng Blackwell Publishing Ltd. The Journal's web site is located at http://www.blackwellpublishing.com/journals/GJI United Kingdom Geophysical Journal International http://www.scopus.com/mlt/select.url?eid=2-s2.0-0042123663&selection=ref&src=s&origin=recordpage Geophysical Journal International, 2003, v. 154 n. 2, p. 463-470 doi:10.1046/j.1365-246X.2003.01974.x 470 90890 WOS:000184266700013 0956-540X 2 eid_2-s2.0-0042123663 463 http://hdl.handle.net/10722/151105 154 Geophysical Journal International. Copyright © Blackwell Publishing Ltd. London City Formation Shallow Inclinations Palaeomagnetism North Atlantic Igneous Province Eocene Eurasia Article 2003 ftunivhongkonghu https://doi.org/10.1046/j.1365-246X.2003.01974.x 2023-01-14T15:43:29Z A 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. link_to_subscribed_fulltext Article in Journal/Newspaper Faroe Islands North Atlantic University of Hong Kong: HKU Scholars Hub Faroe Islands Geophysical Journal International 154 2 463 470 |
institution |
Open Polar |
collection |
University of Hong Kong: HKU Scholars Hub |
op_collection_id |
ftunivhongkonghu |
language |
English |
topic |
London City Formation Shallow Inclinations Palaeomagnetism North Atlantic Igneous Province Eocene Eurasia |
spellingShingle |
London City Formation Shallow Inclinations Palaeomagnetism North Atlantic Igneous Province Eocene Eurasia King, C Abrajevitch, A Ali, JR Ward, DJ First Palaeogene sedimentary rock palaeomagnetic pole from stable western Eurasia and tectonic implications |
topic_facet |
London City Formation Shallow Inclinations Palaeomagnetism North Atlantic Igneous Province Eocene Eurasia |
description |
A 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. link_to_subscribed_fulltext |
format |
Article in Journal/Newspaper |
author |
King, C Abrajevitch, A Ali, JR Ward, DJ |
author_facet |
King, C Abrajevitch, A Ali, JR Ward, DJ |
author_sort |
King, C |
title |
First Palaeogene sedimentary rock palaeomagnetic pole from stable western Eurasia and tectonic implications |
title_short |
First Palaeogene sedimentary rock palaeomagnetic pole from stable western Eurasia and tectonic implications |
title_full |
First Palaeogene sedimentary rock palaeomagnetic pole from stable western Eurasia and tectonic implications |
title_fullStr |
First Palaeogene sedimentary rock palaeomagnetic pole from stable western Eurasia and tectonic implications |
title_full_unstemmed |
First Palaeogene sedimentary rock palaeomagnetic pole from stable western Eurasia and tectonic implications |
title_sort |
first palaeogene sedimentary rock palaeomagnetic pole from stable western eurasia and tectonic implications |
publisher |
Blackwell Publishing Ltd. The Journal's web site is located at http://www.blackwellpublishing.com/journals/GJI |
publishDate |
2003 |
url |
https://doi.org/10.1046/j.1365-246X.2003.01974.x http://hdl.handle.net/10722/151105 |
geographic |
Faroe Islands |
geographic_facet |
Faroe Islands |
genre |
Faroe Islands North Atlantic |
genre_facet |
Faroe Islands North Atlantic |
op_relation |
Geophysical Journal International http://www.scopus.com/mlt/select.url?eid=2-s2.0-0042123663&selection=ref&src=s&origin=recordpage Geophysical Journal International, 2003, v. 154 n. 2, p. 463-470 doi:10.1046/j.1365-246X.2003.01974.x 470 90890 WOS:000184266700013 0956-540X 2 eid_2-s2.0-0042123663 463 http://hdl.handle.net/10722/151105 154 |
op_rights |
Geophysical Journal International. Copyright © Blackwell Publishing Ltd. |
op_doi |
https://doi.org/10.1046/j.1365-246X.2003.01974.x |
container_title |
Geophysical Journal International |
container_volume |
154 |
container_issue |
2 |
container_start_page |
463 |
op_container_end_page |
470 |
_version_ |
1765996148174094336 |