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Grenvillian extensional tectonics in northwest Scotland

1997; Geological Society of America; Volume: 25; Issue: 1 Linguagem: Inglês

10.1130/0091-7613(1997)025 2.3.co;2

1943-2682

Stephen Temperley, Brian F. Windley,

Geological formations and processes

Research Article| January 01, 1997 Grenvillian extensional tectonics in northwest Scotland Stephen Temperley; Stephen Temperley 1Department of Geology, Leicester University, Leicester LE1 7RH, United Kingdom Search for other works by this author on: GSW Google Scholar Brian F. Windley Brian F. Windley 1Department of Geology, Leicester University, Leicester LE1 7RH, United Kingdom Search for other works by this author on: GSW Google Scholar Author and Article Information Stephen Temperley 1Department of Geology, Leicester University, Leicester LE1 7RH, United Kingdom Brian F. Windley 1Department of Geology, Leicester University, Leicester LE1 7RH, United Kingdom Publisher: Geological Society of America First Online: 02 Jun 2017 Online ISSN: 1943-2682 Print ISSN: 0091-7613 Geological Society of America Geology (1997) 25 (1): 53–56. https://doi.org/10.1130/0091-7613(1997)025 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 Email Permissions Search Site Citation Stephen Temperley, Brian F. Windley; Grenvillian extensional tectonics in northwest Scotland. Geology 1997;; 25 (1): 53–56. doi: https://doi.org/10.1130/0091-7613(1997)025 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 New structural data indicate that eclogite-bearing gneisses in the Glenelg-Attadale inlier of the Caledonian Moine thrust nappe, northwest Scotland, were involved in a major pre-Caledonian system of extensional top-to-the-east ductile shear zones. These shear zones coalesce upward to constitute a major extensional detachment below metasedimentary rocks of the Moine Supergroup. Both the eclogite-bearing gneisses and the Moinian metasedimentary rocks display evidence of extensional deformation, but the latter contain structures indicative of a lower intensity of bulk finite shear strain and may have experienced only the later of two discrete phases of extension that we recognize in the inlier. Coplanar Caledonian brittle-ductile, top-to-the-west thrusting has resulted in only localized and limited reactivation. Timing of the extensional deformation is bracketed by a published Sm/Nd age of 1.08 Ga for eclogite equilibration and by a minimum age of deposition for the Moine Supergroup of 840 Ma. We propose that the eclogite-bearing lower crust was exhumed as a result of collapse of the Grenville Orogen, and that the evolution of the Moinian basin was controlled by this extensional event. 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.