Fluorapatite in the Paleoproterozoic Thelon Basin: Structural-stratigraphic context, in situ ion microprobe U-Pb ages, and fluid-flow history

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Abstract

Research Article| May 01, 2011 Fluorapatite in the Paleoproterozoic Thelon Basin: Structural-stratigraphic context, in situ ion microprobe U-Pb ages, and fluid-flow history W.J. Davis; W.J. Davis † 1Geological Survey of Canada, 601 Booth Street, Ottawa, Ontario K1A 0E8, Canada †E-mail: bill.davis@nrcan.gc.ca Search for other works by this author on: GSW Google Scholar Q. Gall; Q. Gall 21864 Rideau Garden Drive, Ottawa, Ontario K1S 1G6, Canada Search for other works by this author on: GSW Google Scholar C.W. Jefferson; C.W. Jefferson 1Geological Survey of Canada, 601 Booth Street, Ottawa, Ontario K1A 0E8, Canada Search for other works by this author on: GSW Google Scholar R.H. Rainbird R.H. Rainbird 1Geological Survey of Canada, 601 Booth Street, Ottawa, Ontario K1A 0E8, Canada Search for other works by this author on: GSW Google Scholar Author and Article Information W.J. Davis † 1Geological Survey of Canada, 601 Booth Street, Ottawa, Ontario K1A 0E8, Canada Q. Gall 21864 Rideau Garden Drive, Ottawa, Ontario K1S 1G6, Canada C.W. Jefferson 1Geological Survey of Canada, 601 Booth Street, Ottawa, Ontario K1A 0E8, Canada R.H. Rainbird 1Geological Survey of Canada, 601 Booth Street, Ottawa, Ontario K1A 0E8, Canada †E-mail: bill.davis@nrcan.gc.ca Publisher: Geological Society of America Received: 02 Sep 2009 Revision Received: 22 Feb 2010 Accepted: 08 Mar 2010 First Online: 08 Mar 2017 Online ISSN: 1943-2674 Print ISSN: 0016-7606 © 2011 Geological Society of America GSA Bulletin (2011) 123 (5-6): 1056–1073. https://doi.org/10.1130/B30163.1 Article history Received: 02 Sep 2009 Revision Received: 22 Feb 2010 Accepted: 08 Mar 2010 First Online: 08 Mar 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn Email Permissions Search Site Citation W.J. Davis, Q. Gall, C.W. Jefferson, R.H. Rainbird; Fluorapatite in the Paleoproterozoic Thelon Basin: Structural-stratigraphic context, in situ ion microprobe U-Pb ages, and fluid-flow history. GSA Bulletin 2011;; 123 (5-6): 1056–1073. doi: https://doi.org/10.1130/B30163.1 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 Fluorapatite cements have been documented at more than 18 localities in the Thelon Basin, Canada, occupying stratigraphic positions from the paleosol below the unconformity to well within the upper parts of the fluvial siliciclastic Thelon Formation. Ion microprobe analyses targeted using cathodo luminescence images to areas of higher uranium content on petrographically characterized cements provide the most precise pin on the timing of meso diagenesis in the northeastern part of the Thelon Basin at 1667 ± 5 Ma. Expulsion of phosphate-rich basinal brines was asso ciated with development of faults and local breccias in the lower strata where extensive quartz cementation took place before the apatite event. The new data do not support previous interpretations for multiple episodes of fluorapatite cementation within the basin despite the wide range of stratigraphic positions and variations in style of occurrence. The tectonic cause remains speculative, as does the relationship of the fluorapatite cements to the unconformity-style uranium mineralization. Thelon fluorapatite cements are older than those reported in the Athabasca basin, suggesting distinct fluid-flow histories occurred within the two basins. The difference in timing indicates that the basinwide events that generated the fluids with the chemistry capa ble of producing fluor apatite cement took place independently but under similar conditions within the Thelon and Athabasca basins. You do not have access to this content, please speak to your institutional administrator if you feel you should have access.

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