Southern Abitibi greenstone belt: Archean crustal structure from seismic-reflection profiles

Research Article| November 01, 1990 Southern Abitibi greenstone belt: Archean crustal structure from seismic-reflection profiles S. L. Jackson; S. L. Jackson 1Ontario Geological Survey, 77 Grenville Street, Toronto, Ontario M7A 1 W4,Canada Search for other works by this author on: GSW Google Scholar R. H. Sutcliffe; R. H. Sutcliffe 1Ontario Geological Survey, 77 Grenville Street, Toronto, Ontario M7A 1 W4,Canada Search for other works by this author on: GSW Google Scholar J. N. Ludden; J. N. Ludden 2Université de Montréal, Montréal, Québec H3C 3J7, Canada Search for other works by this author on: GSW Google Scholar C. Hubert; C. Hubert 2Université de Montréal, Montréal, Québec H3C 3J7, Canada Search for other works by this author on: GSW Google Scholar A. G. Green; A. G. Green 3Geological Survey of Canada, 1 Observatory Crescent, Ottawa, Ontario K1 A OY3, Canada Search for other works by this author on: GSW Google Scholar B. Milkereit; B. Milkereit 3Geological Survey of Canada, 1 Observatory Crescent, Ottawa, Ontario K1 A OY3, Canada Search for other works by this author on: GSW Google Scholar L. Mayrand; L. Mayrand 3Geological Survey of Canada, 1 Observatory Crescent, Ottawa, Ontario K1 A OY3, Canada Search for other works by this author on: GSW Google Scholar G. F. West; G. F. West 4Department of Physics, University of Toronto, Toronto, Ontario M5S 1A7, Canada Search for other works by this author on: GSW Google Scholar P. Verpaelst P. Verpaelst 5Ministère de l'Energie et des Ressources, Rouyn-Noranda, Québec J9X 6N5, Canada Search for other works by this author on: GSW Google Scholar Geology (1990) 18 (11): 1086–1090. https://doi.org/10.1130/0091-7613(1990)018<1086:SAGBAC>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 S. L. Jackson, R. H. Sutcliffe, J. N. Ludden, C. Hubert, A. G. Green, B. Milkereit, L. Mayrand, G. F. West, P. Verpaelst; Southern Abitibi greenstone belt: Archean crustal structure from seismic-reflection profiles. Geology 1990;; 18 (11): 1086–1090. doi: https://doi.org/10.1130/0091-7613(1990)018<1086:SAGBAC>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 Lithoprobe seismic-reflection profiles from the 2.75-2.68 Ga southern Abitibi greenstone belt reveal subhorizontal reflection zones of regional extent in the upper 15 km of crust that contrast with the steep dips of rock units and structures at the surface. The shallowest (6-12 km) regional, subhorizontal reflection zone is interpreted to be the base of the Abitibi greenstone belt supracrustal assemblage which may be an intrusive and/or tectonic contact. Shallowly dipping, subparallel reflectors in the upper crust are interpreted as low-angle faults, consistent with "out-of-sequence" stratigraphy revealed by U-Pb geochronology. Truncations of reflectors suggest that regional, steeply dipping, gold-mineralized fault zones penetrate to depths of 15 km. The profiles are consistent with the Kapuskasing crustal model of the central Superior province, wherein greenstone belts are underlain by middle-crustal felsic intrusions and gneiss and a lower-crustal zone of mafic gneiss and intrusions. The profiles support tectonic models of deformation of the Abitibi greenstone belt that invoke either folding and thrusting followed by regional steep faulting or folding and thrusting linked to the steep faults. 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.