Anatomy of the Early Proterozoic Nagssugtoqidian orogen, West Greenland, explored by reconnaissance SHRIMP U-Pb zircon dating

Abstract

Research Article| June 01, 1996 Anatomy of the Early Proterozoic Nagssugtoqidian orogen, West Greenland, explored by reconnaissance SHRIMP U-Pb zircon dating Feiko Kalsbeek; Feiko Kalsbeek 1Geological Survey of Greenland and Danish Lithosphere Centre, DK-1350 Copenhagen K, Denmark Search for other works by this author on: GSW Google Scholar Allen P. Nutman Allen P. Nutman 2Research School of Earth Sciences, Australian National University, Canberra, A.C.T. 0200, Australia Search for other works by this author on: GSW Google Scholar Geology (1996) 24 (6): 515–518. https://doi.org/10.1130/0091-7613(1996)024<0515:AOTEPN>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 Feiko Kalsbeek, Allen P. Nutman; Anatomy of the Early Proterozoic Nagssugtoqidian orogen, West Greenland, explored by reconnaissance SHRIMP U-Pb zircon dating. Geology 1996;; 24 (6): 515–518. doi: https://doi.org/10.1130/0091-7613(1996)024<0515:AOTEPN>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 Reconnaissance SHRIMP U-Pb zircon dating of 90 samples from the Early Proterozoic Nagssugtoqidian orogen of West Greenland, together with previous age and isotope data as well as new field observations, yields information on some large-scale structures of the orogen: 1900–1940 Ma dioritic to tonalitic juvenile arc rocks (positive initial ϵNd values) are thrust more than 50 km over Archean gneisses in the central and northern portions of the orogen. Archean and Proterozoic rocks are tectonically interleaved near the southern margin of the orogen. Regional reworking (high-grade metamorphism, shearing, and crustal melting) occurred at 1800–1840 Ma and ca. 1780 Ma. Tectonic emplacement of juvenile Proterozoic arc rocks over Archean gneisses suggests that the Nagssugtoqidian orogen contains slices of unrelated rocks swept together by closure of an ocean of unknown extent. 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.