A fission-track age for the Skaergaard intrusion and the age of the East Greenland basalts

Research Article| September 01, 1977 A fission-track age for the Skaergaard intrusion and the age of the East Greenland basalts C. K. Brooks; C. K. Brooks 1Institute of Petrology, Øster Voldgade 10, DK-1350 Copenhagen K, Denmark Search for other works by this author on: GSW Google Scholar A.J.W. Gleadow A.J.W. Gleadow 2Department of Geology, School of Earth Sciences, University of Melbourne, Parkville, Victoria, Australia 3050 Search for other works by this author on: GSW Google Scholar Author and Article Information C. K. Brooks 1Institute of Petrology, Øster Voldgade 10, DK-1350 Copenhagen K, Denmark A.J.W. Gleadow 2Department of Geology, School of Earth Sciences, University of Melbourne, Parkville, Victoria, Australia 3050 Publisher: Geological Society of America First Online: 02 Jun 2017 Online ISSN: 1943-2682 Print ISSN: 0091-7613 Geological Society of America Geology (1977) 5 (9): 539–540. https://doi.org/10.1130/0091-7613(1977)5<539:AFAFTS>2.0.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. K. Brooks, A.J.W. Gleadow; A fission-track age for the Skaergaard intrusion and the age of the East Greenland basalts. Geology 1977;; 5 (9): 539–540. doi: https://doi.org/10.1130/0091-7613(1977)5<539:AFAFTS>2.0.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 We report here a fission-track age of 54.6 ±1.7 m.y. for the Skaergaard intrusion, East Greenland, using zircons separated from two different rocks that give concordant results. This age is consistent with previously reported K-Ar ages for the surrounding basalts of 55 to 60 m.y. but not with the more recent K-Ar results that give ages of <50 m.y. It is also in accordance with the known age of 50.0 ± 0.4 m.y. for the neighboring alkalic intrusion known from field evidence to be younger. This date is significant because several authors have argued a key position for the East Greenland magmatic activity relative to the dating of the lower Tertiary magnetic time scale. 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.