uu.seUppsala University Publications
Change search
ReferencesLink to record
Permanent link

Direct link
Dating the onset of volcanism at the Rum Igneous Centre, NW Scotland
Department of Geology, School of Natural Science, Trinity College Dublin, Dublin 2, Ireland.
School of Geosciences, University of St. Andrews, KY16 9AL, UK.
Department of Earth Sciences, University of Durham, Durham DHI 3LE, UK.
2008 (English)In: Journal of the Geological Society, ISSN 0016-7649, E-ISSN 2041-479X, Vol. 165, 651-659 p.Article in journal (Refereed) Published
Abstract [en]

Major volcanic activity on the Isle of Rum commenced with the eruption of thick (>100 m) intra-caldera rhyodacite ash-flow sheets fed from steep-sided feeder conduits in the proximity of the Main Ring Fault. Twenty plagioclase phenocrysts of the rhyodacite were analysed using single crystal 40Ar/39Ar laser dating, yielding a mean apparent age of 60.83 ± 0.27 Ma (MSWD=3.65). On an age v. probability plot the feldspars do not, however, show a simple Gaussian distribution, but a major peak at 60.33 ± 0.21 Ma and two smaller shoulders at c. 61.4 Ma and 63 Ma. These older ages are interpreted to represent recycled and largely re-equilibrated feldspars. The age peak at 60.33 ± 0.21 Ma is interpreted to represent the intrusion and eruption age of the rhyodacites. This new age constraint overlaps with that for the ultrabasic intrusion, implying that the latter was already forming at depth and supplying necessary heat during the early felsic activity phase, and quickly thereafter migrated upwards to shallow structural levels and intruded the volcano's earlier deposits. Combined with previously published ages, these new age data highlight an extremely rapid succession of events at the Rum centre, the whole sequence occurring in potentially <500 ka.

Place, publisher, year, edition, pages
2008. Vol. 165, 651-659 p.
National Category
Geosciences, Multidisciplinary
URN: urn:nbn:se:uu:diva-284319DOI: 10.1144/0016-76492006-190OAI: oai:DiVA.org:uu-284319DiVA: diva2:924132
Available from: 2016-04-27 Created: 2016-04-16 Last updated: 2016-05-12Bibliographically approved

Open Access in DiVA

No full text

Other links

Publisher's full texthttp://jgs.lyellcollection.org/content/165/3/651.abstract

Search in DiVA

By author/editor
Troll, Valentin
In the same journal
Journal of the Geological Society
Geosciences, Multidisciplinary

Search outside of DiVA

GoogleGoogle Scholar
The number of downloads is the sum of all downloads of full texts. It may include eg previous versions that are now no longer available

Altmetric score

Total: 15 hits
ReferencesLink to record
Permanent link

Direct link