Siegenian generation of the Lizard Ophiolite; U-Pb zircon age data for plagiogranite, Porthkerris, Cornwall

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doi: 10.1144/gsjgs.155.4.0595
Authors:Clark, A. H.; Scott, D. J.; Sandeman, H. A.; Bromley, A. V.; Farrar, E.
Author Affiliations:Primary:
Queen's University, Department of Geology Sciences, Kingston, ON, Canada
Other:
Geological Survey of Canada, Ottawa, ON, Canada
Petrolab, Redruth, United Kingdom
Volume Title:Journal of the Geological Society of London
Source:Journal of the Geological Society of London, Vol.155(Part 4), p.595-598. Publisher: Geological Society of London, London, United Kingdom. ISSN: 0016-7649
Publication Date:1998
Note:In English. 34 refs.; illus., incl. 1 table, geol. sketch map
Summary:The U-Pb dating of three single magmatic zircons from a plagiogranite dyke near Porthkerris Point on the Lizard demonstrates that the axial oceanic crust was undergoing extensional ductile shearing, mylonitization, amphibolite-facies metamorphism and, probably, anatexis at 397 ± 2 m.y. In conjunction with published K-Ar, 40Ar-39Ar and Rb-Sr data for the complex, this early Devonian age indicates a protracted interval between intra-oceanic magmatism and deformation on the one hand, and obduction during late Devonian, northwestward displacement of the Normannian High on the other. [R.A.H.]
Sections:Age determination
Subjects:Absolute age; Amphibolite facies; Dates; Devonian; Dikes; Diorites; Facies; Genesis; Igneous rocks; Intrusions; Lower Devonian; Magmatism; Metamorphic rocks; Metamorphism; Nesosilicates; Ophiolite; Orogeny; Orthosilicates; Paleozoic; Plagiogranite; Plutonic rocks; Shear; Siegenian; Silicates; Tectonics; U/Pb; Variscan Orogeny; Zircon; Zircon group; Cornwall England; England; Europe; Great Britain; United Kingdom; Western Europe; Lizard Ophiolite; Porthkerris Point
Coordinates:N500000 N505000 W0041500 W0063000
Abstract Numbers:98M/3345
Record ID:1998042276
Copyright Information:GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United Kingdom, Twickenham, United Kingdom
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