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Devonian magmatism in the Timan Range, Arctic Russia - subduction, post-orogenic extension, or rifting?
Stockholm University, Faculty of Science, Department of Geological Sciences.
Stockholm University, Faculty of Science, Department of Geological Sciences. Memorial University of Newfoundland, Canada.
Number of Authors: 4
2016 (English)In: Tectonophysics, ISSN 0040-1951, E-ISSN 1879-3266, Vol. 691, 185-197 p.Article in journal (Refereed) Published
Abstract [en]

Devonian mafic magmatism of the northern East European Craton (EEC) has been variously linked to Uralian subduction, post-orogenic extension associated with Caledonian collision, and rifting. New elemental and isotopic analyses of Devonian basalts from the Timan Range and Kanin Peninsula, Russia, in the northern EEC constrain magma genesis, mantle source(s) and the tectonic process(es) associated with this Devonian volcanism to a rift-related context. Two compositional groups of low-K2O tholeiitic basalts are recognized. On the basis of Th concentrations, LREE concentrations, and (LREE/HREE)(N), the data suggest two distinct magma batches. Incompatible trace elements ratios (e.g., Th/Yb, Nb/Th, Nb/La) together with Nd and Pb isotopes indicate involvement of an NMORB to EMORB 'transitional' mantle component mixed with variable amounts of a continental component. The magmas were derived from a source that developed high (U,Th)/Pb, U/Th and Sm/Nd over time. The geochemistry of Timan-Kanin basalts supports the hypothesis that the genesis of Devonian basaltic magmatism in the region resulted from local melting of transitional mantle and lower crust during rifting of a mainly non volcanic continental rifted margin.

Place, publisher, year, edition, pages
2016. Vol. 691, 185-197 p.
Keyword [en]
East European Craton, Devonian rifted margin, Basalt, Geochemistry, Crustal contamination
National Category
Earth and Related Environmental Sciences
Identifiers
URN: urn:nbn:se:su:diva-137628DOI: 10.1016/j.tecto.2016.02.002ISI: 000389390900012OAI: oai:DiVA.org:su-137628DiVA: diva2:1063009
Available from: 2017-01-09 Created: 2017-01-09 Last updated: 2017-01-09Bibliographically approved

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