Early Palaeozoic rift-related magmatism in Variscan Europe; fragmentation of the Armorican terrane assemblage

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doi: 10.1046/j.1365-3121.2000.00290.x
Authors:Crowley, Q. G.; Floyd, P. A.; Winchester, J. A.; Franke, W.; Holland, J. G.
Author Affiliations:Primary:
Keele University, School of Earth Sciences and Geography, United Kingdom
Liebig Universitait, Federal Republic of Germany
University of Durham, United Kingdom
Volume Title:Terra Nova
Source:Terra Nova, 12(4), p.171-180. Publisher: Blackwell, Oxford, United Kingdom. ISSN: 0954-4879
Publication Date:2000
Note:In English. 74 refs.; illus., incl. 1 table, geol. sketch maps
Summary:Early Palaeozoic bimodal, rift-related magmatism that is widespread in the European Variscides being traceable from the Polish Sudetes to NW Iberia, generally post-dates granitic plutonism. In the N Bohemian massif this early Palaeozoic (Cambro-Ordovician) granitic plutonism was produced from partial melting of Cadomian basement whereas in the NW Iberian massif, contemporaneous magmatism produced alkali granites with a mantle component. Silurian-Devonian mafic magmatism in the N Bohemian massif, massif central and NW Iberian massif is partly preserved as obducted ophiolites. The compositional diversity of Cambro-Ordovician mafic magmatism is attributed to interaction of a spreading centre and upwelling mantle plume. This implies that a combination of tensional forces and mantle plume convection assisted early Palaeozoic dispersal of terrains from the N Gondwanan margin. Continued fragmentation produced an archipelago of related terrains separated by a network of seaways and newly-formed ocean crust. [J.F.]
Subsections:Igneous petrology
Subjects:Basalts; Chemical fractionation; Chemical ratios; Convection; Geochemistry; Granites; Igneous rocks; Intrusions; Lower Paleozoic; Magmas; Mantle; Mid-ocean ridge basalts; Mineral composition; Paleogeography; Paleozoic; Partial melting; Plate tectonics; Plutonic rocks; Plutons; Processes; Rifting; Tectonics; Trace elements; Volcanic rocks; Armorican Massif; Europe; France; Variscides; Western Europe
Abstract Numbers:01M/4516
Record ID:2003032851
Copyright Information:GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United Kingdom, Twickenham, United Kingdom
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