Journal article
Exhumation of the high-pressure Richarddalen Complex in NW Svalbard; insights from (super 40) Ar/ (super 39) Ar geochronology
Terra nova (Oxford, England), Vol.34(4), pp.330-339
08/2022
DOI: 10.1111/ter.12597
Abstract
(super 40) Ar/ (super 39) Ar dating of white mica from foliated metamorphic rocks of the Caledonian orogen of NW Svalbard was performed using the single-grain fusion technique. Two samples, an augen orthogneiss and a mica schist, were collected from the high-pressure Richarddalen Complex. Three additional mica schist samples were collected from the tectonically underlying Montblanc Unit. (super 40) Ar/ (super 39) Ar analysis of white mica separates yielded weighted average (super 40) Ar/ (super 39) Ar dates of 446.1 + or - 1.1, 438.4 + or - 1.1, 439.4 + or - 1.2, 439.8 + or - 1.5 and 439.3 + or - 1.0 Ma, with the oldest date provided by the Richarddalen mica schist. The single-grain fusion (super 40) Ar/ (super 39) Ar dating was accompanied by geochemical mapping of white mica using a microprobe. We interpret the oldest date as the age of cooling after a Late Ordovician high-pressure event and the four younger dates to represent the timing of subsequent deformation associated with assembly of a Caledonian nappe stack. Abstract Copyright (2022), John Wiley & Sons, Ltd.
Details
- Title: Subtitle
- Exhumation of the high-pressure Richarddalen Complex in NW Svalbard; insights from (super 40) Ar/ (super 39) Ar geochronology
- Creators
- Stanislaw Mazur - Polish Academy of SciencesJaroslaw Majka - Uppsala UniversityChristopher J. Barnes - Instytut Nauk GeologicznychWilliam McClelland - University of IowaMichal Bukala - Polish Academy of SciencesMarian Janak - Earth Science InstituteKarolina Kosminska - AGH University of Krakow
- Resource Type
- Journal article
- Publication Details
- Terra nova (Oxford, England), Vol.34(4), pp.330-339
- Publisher
- Wiley-Blackwell
- DOI
- 10.1111/ter.12597
- ISSN
- 0954-4879
- eISSN
- 1365-3121
- Grant note
- Narodowe Centrum Nauki
Narodowe Centrum Nauki
- Language
- English
- Date published
- 08/2022
- Academic Unit
- Earth and Environmental Sciences
- Record Identifier
- 9984748155302771
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