Intraoceanic tectonics and the development of continental crust: 1.92–1.84 Ga evolution of the Flin Flon Belt, Canada

Abstract

Research Article| May 01, 1996 Intraoceanic tectonics and the development of continental crust: 1.92–1.84 Ga evolution of the Flin Flon Belt, Canada S. B. Lucas; S. B. Lucas 1Geological Survey of Canada, 601 Booth Street, Ottawa, Ontario, Canada, K1A 0E8 Search for other works by this author on: GSW Google Scholar R. A. Stern; R. A. Stern 1Geological Survey of Canada, 601 Booth Street, Ottawa, Ontario, Canada, K1A 0E8 Search for other works by this author on: GSW Google Scholar E. C. Syme; E. C. Syme 2Manitoba Energy and Mines, 1395 Ellice Avenue, Winnipeg, Manitoba, Canada, R3G 3P2 Search for other works by this author on: GSW Google Scholar B. A. Reilly; B. A. Reilly 3Saskatchewan Geological Survey, 1914 Hamilton Street, Regina, Saskatchewan, Canada, S4P 4V4 Search for other works by this author on: GSW Google Scholar D. J. Thomas D. J. Thomas 3Saskatchewan Geological Survey, 1914 Hamilton Street, Regina, Saskatchewan, Canada, S4P 4V4 Search for other works by this author on: GSW Google Scholar Author and Article Information S. B. Lucas 1Geological Survey of Canada, 601 Booth Street, Ottawa, Ontario, Canada, K1A 0E8 R. A. Stern 1Geological Survey of Canada, 601 Booth Street, Ottawa, Ontario, Canada, K1A 0E8 E. C. Syme 2Manitoba Energy and Mines, 1395 Ellice Avenue, Winnipeg, Manitoba, Canada, R3G 3P2 B. A. Reilly 3Saskatchewan Geological Survey, 1914 Hamilton Street, Regina, Saskatchewan, Canada, S4P 4V4 D. J. Thomas 3Saskatchewan Geological Survey, 1914 Hamilton Street, Regina, Saskatchewan, Canada, S4P 4V4 Publisher: Geological Society of America First Online: 01 Jun 2017 Online ISSN: 1943-2674 Print ISSN: 0016-7606 Geological Society of America GSA Bulletin (1996) 108 (5): 602–629. https://doi.org/10.1130/0016-7606(1996)108<0602:ITATDO>2.3.CO;2 Article history First Online: 01 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. B. Lucas, R. A. Stern, E. C. Syme, B. A. Reilly, D. J. Thomas; Intraoceanic tectonics and the development of continental crust: 1.92–1.84 Ga evolution of the Flin Flon Belt, Canada. GSA Bulletin 1996;; 108 (5): 602–629. doi: https://doi.org/10.1130/0016-7606(1996)108<0602:ITATDO>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 SocietyGSA Bulletin Search Advanced Search Abstract The Flin Flon Belt is a complex (“Amisk collage”) of distinct tectono-stratigraphic assemblages that was brought together at a relatively early stage in the tectonic evolution of the Paleoproterozoic Trans-Hudson orogen. Four main tectono-stratigraphic assemblage types are recognized: isotopically juvenile oceanic arc (1.90–1.88 Ga), ocean floor (ca. 1.90 Ga), oceanic plateau/ocean island, and isotopically evolved arc (1.92–1.90 Ga). Oceanic arc assemblages include tholeiitic, calc-alkaline, and lesser shoshonitic volcanic and volcaniclastic rocks, as well as turbidites and arc-rift volcanic rocks. The tectono-stratigraphic assemblages were juxtaposed in an accretionary complex (Amisk collage) at ca. 1.88–1.87 Ga, probably as a result of arc-arc collision/collisions. Accretionary collage structures are largely obliterated by subsequent deformation and metamorphic events, but can be inferred where cut by calc-alkaline plutons related to a 1.866–1.838 Ga arc. Coeval subaerial volcanism is recorded in ca. 1.87–1.85 Ga calc-alkaline to shoshonitic volcaniclastic sequences. Unroofing of the accretionary collage, development of a paleosol, and deposition of continental (alluvial-fluvial) sedimentary rocks occurred ca. 1.85–1.84 Ga, coeval with the waning stages of post-accretion arc magmatism. Stabilization of the Flin Flon Belt by 1.85–1.84 Ga as part of a Philippines- or Japan-like microcontinent is attributed to both tectonic and magmatic thickening of the lithosphere. 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.