Emplacement of a Silurian granitic dyke swarm during nappe translation in the Scandinavian Caledonides
- 作者：Anders Mattias Lundmark ; Fern ; o Corfu
- 关键词：Granitic dykes ; U– ; Pb TIMS ; Caledonian ; Nappe ; Strain marker
- 刊名：Journal of Structural Geology
- 出版年：2008
- 期刊代码：52_01918141
- 类别：ear
- 出版时间：July 2008
- 卷：30
- 期：7
- 页码：918-928
- 文件大小：2482 K
摘要
This paper investigates the geometry, deformation history and age of the synkinematic granitic Årdal dyke complex in the Upper Jotun Nappe, SW Norway. The typically subparallel north-trending dykes are folded and boudinaged, reflecting emplacement and deformation in a top-to-southeast non-coaxial strain field. The synmagmatic strain field is interpreted to reflect thrusting of the nappe at 427 ± 1 Ma, the zircon U–Pb TIMS age of the Årdal dyke complex. The Upper Jotun Nappe is a displaced part of the Baltic Shield; the age is therefore a minimum age for initiation of Caledonian thrusting of crystalline Baltica crust in western Norway.