New evidence for coesite in eclogite and gneisses: Defining an ultrahigh-pressure province in the Western Gneiss region of Norway

Abstract

Research Article| October 01, 1997 New evidence for coesite in eclogite and gneisses: Defining an ultrahigh-pressure province in the Western Gneiss region of Norway Alice Wain Alice Wain 1Department of Earth Sciences, University of Oxford, Oxford OX1 3PR, United Kingdom Search for other works by this author on: GSW Google Scholar Author and Article Information Alice Wain 1Department of Earth Sciences, University of Oxford, Oxford OX1 3PR, 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 (10): 927–930. https://doi.org/10.1130/0091-7613(1997)025<0927:NEFCIE>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 Alice Wain; New evidence for coesite in eclogite and gneisses: Defining an ultrahigh-pressure province in the Western Gneiss region of Norway. Geology 1997;; 25 (10): 927–930. doi: https://doi.org/10.1130/0091-7613(1997)025<0927:NEFCIE>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 Widespread evidence of ultrahigh-pressure metamorphism is reported from the Nordfjord and Stadtlandet area of the Western Gneiss region in Norway, outlining a distinct ultrahigh-pressure province. Coesite has been found as inclusions in garnet, omphacite, or kyanite in eclogite from 5 new localities, and quartz pseudomorphs after coesite occur in eclogite minerals at an additional 12 localities. Quartz pseudomorphs after coesite, within garnet and clinozoisite, are reported for the first time from associated gneisses, which is evidence for in situ ultrahigh-pressure metamorphism, at least at a local scale. The boundary to an ultrahigh-pressure province is defined by a metamorphic break from lower pressure (<2.5 GPa) eclogites to coesite or quartz pseudomorph after coesite eclogites (>2.8 GPa) within a 10-km-wide mixed zone in the Nordfjord area. This zone may mark the disrupted tectonic boundary to a small ultrahigh-pressure unit and casts doubt on the assumption that the Western Gneiss region behaved as a coherent terrane during burial and exhumation. 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.