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• W2070106720 abstract "Research Article| July 01, 2002 Iodine-129 constraints on residence times of deep marine brines in the Canadian Shield Dennis J. Bottomley; Dennis J. Bottomley 1Canadian Nuclear Safety Commission, 280 Slater Street, Ottawa, Ontario K1P 5S9, Canada Search for other works by this author on: GSW Google Scholar Robert Renaud; Robert Renaud 2Department of Earth Sciences, Ottawa-Carleton Geoscience Center, University of Ottawa, Ottawa, Ontario K1N 6N5, Canada Search for other works by this author on: GSW Google Scholar Tom Kotzer; Tom Kotzer 3Atomic Energy of Canada Ltd., Chalk River Laboratories, Chalk River, Ontario K0J 1J0, Canada Search for other works by this author on: GSW Google Scholar Ian D. Clark Ian D. Clark 4Department of Earth Sciences, Ottawa-Carleton Geoscience Center, University of Ottawa, Ottawa, Ontario K1N 6N5, Canada Search for other works by this author on: GSW Google Scholar Author and Article Information Dennis J. Bottomley 1Canadian Nuclear Safety Commission, 280 Slater Street, Ottawa, Ontario K1P 5S9, Canada Robert Renaud 2Department of Earth Sciences, Ottawa-Carleton Geoscience Center, University of Ottawa, Ottawa, Ontario K1N 6N5, Canada Tom Kotzer 3Atomic Energy of Canada Ltd., Chalk River Laboratories, Chalk River, Ontario K0J 1J0, Canada Ian D. Clark 4Department of Earth Sciences, Ottawa-Carleton Geoscience Center, University of Ottawa, Ottawa, Ontario K1N 6N5, Canada Publisher: Geological Society of America Received: 19 Nov 2001 Revision Received: 14 Feb 2002 Accepted: 21 Feb 2002 First Online: 02 Jun 2017 Online ISSN: 1943-2682 Print ISSN: 0091-7613 Geological Society of America Geology (2002) 30 (7): 587–590. https://doi.org/10.1130/0091-7613(2002)030<0587:ICORTO>2.0.CO;2 Article history Received: 19 Nov 2001 Revision Received: 14 Feb 2002 Accepted: 21 Feb 2002 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 Dennis J. Bottomley, Robert Renaud, Tom Kotzer, Ian D. Clark; Iodine-129 constraints on residence times of deep marine brines in the Canadian Shield. Geology 2002;; 30 (7): 587–590. doi: https://doi.org/10.1130/0091-7613(2002)030<0587:ICORTO>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 Canadian Shield brines are characterized by high concentrations of both stable iodine and 129I, the former reflecting its concentrated but diagenetically modified seawater origin, and the latter its long subsurface residence time within its host shield rocks. Stable iodine concentrations in the Yellowknife brine are as high as 18 mg/L, requiring the contribution of iodine from an external marine reservoir. This reservoir likely comprised organic-rich marine sediments in the basin where the brine was produced. Diagenesis of these sediments released iodine to the brine during its infiltration into the subsurface. 129I concentrations in the Yellowknife brine are as high as 3.4 × 108 atom/L and are due to the fission of 238U in the rock matrix and subsequent diffusion of the radiogenic 129I into the fracture fluids. This concentration is close to the predicted secular equilibrium concentration for a fluid in basaltic rock with a uranium concentration of 1 mg/kg after the residence time of ∼80 m.y. required for secular equilibrium has been attained. This time period is interpreted as the minimum residence time of the Yellowknife brine in the shield, but it may be much greater, possibly dating back to Middle Devonian time when most of the present-day shield was covered by seawater. Similarly high stable iodine and 129I concentrations measured in the Sudbury brine support a generic, ancient marine hypothesis for the origin of shield brines. Stable iodine and 129I concentrations in the shallower mine waters are the result of mixing between the brine and low-iodine modern meteoric recharge that is enriched in 129I due to global fallout from nuclear fuel waste reprocessing activities. You do not have access to this content, please speak to your institutional administrator if you feel you should have access." @default.
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• W2070106720 title "Iodine-129 constraints on residence times of deep marine brines in the Canadian Shield" @default.
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