Exotic metamorphic terranes in the Caledonides: Tectonic history of the Dalradian block, Scotland

Abstract

Research Article| November 01, 1991 Exotic metamorphic terranes in the Caledonides: Tectonic history of the Dalradian block, Scotland B. J. Bluck; B. J. Bluck 1Department of Geology and Applied Geology, University of Glasgow,Glasgow G12 8QQ, Scotland Search for other works by this author on: GSW Google Scholar T. J. Dempster T. J. Dempster 1Department of Geology and Applied Geology, University of Glasgow,Glasgow G12 8QQ, Scotland Search for other works by this author on: GSW Google Scholar Author and Article Information B. J. Bluck 1Department of Geology and Applied Geology, University of Glasgow,Glasgow G12 8QQ, Scotland T. J. Dempster 1Department of Geology and Applied Geology, University of Glasgow,Glasgow G12 8QQ, Scotland Publisher: Geological Society of America First Online: 02 Jun 2017 Online ISSN: 1943-2682 Print ISSN: 0091-7613 Geological Society of America Geology (1991) 19 (11): 1133–1136. https://doi.org/10.1130/0091-7613(1991)019<1133:EMTITC>2.3.CO;2 Article history First Online: 02 Jun 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn MailTo Tools Icon Tools Get Permissions Search Site Citation B. J. Bluck, T. J. Dempster; Exotic metamorphic terranes in the Caledonides: Tectonic history of the Dalradian block, Scotland. Geology 1991;; 19 (11): 1133–1136. doi: https://doi.org/10.1130/0091-7613(1991)019<1133:EMTITC>2.3.CO;2 Download citation file: Ris (Zotero) Refmanager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu toolbar search search input Search input auto suggest filter your search All ContentBy SocietyGeology Search Advanced Search Abstract The Dalradian block, a part of the Precambrian metamorphic basement of Scotland, is thought to be exotic to Laurentia, having a provenance in Gondwana. In contrast to the rest of the Laurentian margin, which from ca. 700 to 530 Ma was undergoing extension, the Dalradian block was undergoing severe compression ca. 590 Ma. At the time of splitting of the Late Proterozoic supercontinent, both Gondwana and Laurentia shared a common history of extension; however, at ca. 670 Ma Gondwana converted to a destructive margin and underwent compression, whereas Laurentia remained in extension and passive to 500-510 Ma. The Dalradian block had two major phases of metamorphism and deformation, one in Gondwana, and the other in Laurentia. The second phase of classical Barrovian metamorphism may have been produced by thickening due to emplacement of ophiolitic and other nappes, rather than the earlier internal nappe structures. Late-stage ductile folding in the Moine basement to the north may be related to the final emplacement of the Dalradian block onto Laurentia. This content is PDF only. Please click on the PDF icon to access. First Page Preview Close Modal You do not have access to this content, please speak to your institutional administrator if you feel you should have access.