globalchange  > 影响、适应和脆弱性
DOI: 10.1007/s00531-013-0961-x
Scopus记录号: 2-s2.0-84902377973
论文题名:
Armorican provenance for the mélange deposits below the Lizard ophiolite (Cornwall, UK): Evidence for Devonian obduction of Cadomian and Lower Palaeozoic crust onto the southern margin of Avalonia
作者: Strachan R.A.; Linnemann U.; Jeffries T.; Drost K.; Ulrich J.
刊名: International Journal of Earth Sciences
ISSN: 14373254
出版年: 2014
卷: 103, 期:5
起始页码: 1359
结束页码: 1383
语种: 英语
英文关键词: Armorica ; Avalonia ; Detrital zircons ; Lizard ophiolite ; Meneage Formation ; Rheic Ocean
Scopus关键词: Avalonia ; Cadomian orogeny ; detrital deposit ; Devonian ; melange ; microplate ; obduction ; ophiolite ; paleoceanography ; provenance ; tectonophysics ; uranium-lead dating ; zircon ; Cornwall [England] ; England ; France ; United Kingdom ; West African Craton ; Squamata
英文摘要: Devonian sedimentary rocks of the Meneage Formation within the footwall of the Lizard ophiolite complex in SW England are thought to have been derived from erosion of the over-riding Armorican microplate during collision with Avalonia and the closure of the Rheic Ocean. We further test this hypothesis by comparison of their detrital zircon suites with those of autochthonous Armorican strata. Five samples analysed from SW England (Avalonia) and NW France (Armorica) have a bimodal U-Pb zircon age distribution dominated by late Neoproterozoic to middle Cambrian (c. 710-518 Ma) and Palaeoproterozoic (c. 1,800-2,200 Ma) groupings. Both can be linked with lithologies exposed within the Cadomian belt as well as the West African craton, which is characterized by major tectonothermal events at 2.0-2.4 Ga. The detrital zircon signature of Avalonia is distinct from that of Armorica in that there is a much larger proportion of Mesoproterozoic detritus. The common provenance of the samples is therefore consistent with: (a) derivation of the Meneage Formation mélange deposits from the Armorican plate during Rheic Ocean closure and obduction of the Lizard Complex and (b) previous correlation of quartzite blocks within the Meneage Formation with the Ordovician Grès Armoricain Formation of NW France. © 2013 Springer-Verlag Berlin Heidelberg.
URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84902377973&doi=10.1007%2fs00531-013-0961-x&partnerID=40&md5=8de768adb0998a0801b7ad8e1142e982
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/70384
Appears in Collections:影响、适应和脆弱性
气候减缓与适应

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作者单位: School of Earth and Environmental Sciences, University of Portsmouth, Portsmouth, PO1 3QL, United Kingdom; Senckenberg Naturhistorische Sammlungen Dresden, Museum für Mineralogie und Geologie, Königsbrücker Landstraße 159, 01109 Dresden, Germany; The Natural History Museum, Cromwell Road, London, SW7 5BD, United Kingdom; Fachbereich Geowissenschaften, Isotopengeochemie, Universität Tübingen, Wilhelmstraße 56, 72076 Tübingen, Germany

Recommended Citation:
Strachan R.A.,Linnemann U.,Jeffries T.,et al. Armorican provenance for the mélange deposits below the Lizard ophiolite (Cornwall, UK): Evidence for Devonian obduction of Cadomian and Lower Palaeozoic crust onto the southern margin of Avalonia[J]. International Journal of Earth Sciences,2014-01-01,103(5)
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