Research Article| November 01, 1995 New evidence for protolith ages of Lewisian granulites, northwest Scotland C. R. L. Friend; C. R. L. Friend 1Department of Geology, Oxford Brookes University, Oxford OX3 OBP, United Kingdom Search for other works by this author on: GSW Google Scholar P. D. Kinny P. D. Kinny 1Department of Geology, Oxford Brookes University, Oxford OX3 OBP, United Kingdom Search for other works by this author on: GSW Google Scholar Geology (1995) 23 (11): 1027–1030. https://doi.org/10.1130/0091-7613(1995)023<1027:NEFPAO>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 C. R. L. Friend, P. D. Kinny; New evidence for protolith ages of Lewisian granulites, northwest Scotland. Geology 1995;; 23 (11): 1027–1030. doi: https://doi.org/10.1130/0091-7613(1995)023<1027:NEFPAO>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 granulite facies Scourian rocks in the central region of the Lewisian complex of northwest Scotland play an important role in the understanding of the development of mid-Archean high-grade gneiss complexes. Whereas the later, largely Proterozoic history of the Scourian has been clarified in a detailed U-Pb study, unraveling the Archean ages of the protoliths using conventional isotope techniques has proved impossible. In order to advance our understanding of the deep crustal processes responsible for these granulites, it is essential to establish the age(s) of accretion of the protoliths and their subsequent tectonothermal history. A combined cathodoluminescence (CL) and sensitive high-mass resolution ion microprobe (SHRIMP) single-zircon study has revealed a hitherto unrecognized morphological complexity in zircons from the type localities of the granulites. Use of CL allowed identification of relict oscillatory igneous zoning, metamorphic overgrowths, and irregular areas of recrystallization. From the SHRIMP data, an age of ca. 2960 Ma is inferred for the gneiss protoliths, which were altered considerably during an important metamorphic event ca. 2490 Ma. 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.