The origin of polymetallic Ni-Co-As-Bi-Sb(-Ag-U) veins in the East Arm Basin and southern Slave Province, Northwest Territories

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dc.contributor.advisor Hanley, Jacob James, 1976-
dc.creator Burke, Jordan Scott
dc.date.accessioned 2019-05-13T13:59:58Z
dc.date.available 2019-05-13T13:59:58Z
dc.date.issued 2019
dc.identifier.other QE446 N7 B87 2019
dc.identifier.uri http://library2.smu.ca/handle/01/28564
dc.description 150, [12] leaves : illustrations (chiefly colour), colour maps ; 29 cm
dc.description Includes abstract.
dc.description Includes bibliographical references.
dc.description.abstract Polymetallic, &ldquo;five-metals association (FMA)&rdquo;-type Ni-Co-As-Bi-Sb (-Ag-U) hydrothermal vein deposits occur in the vicinity of the East Arm Basin, Great Slave Lake, at Blanchet Island and Copper Pass, Northwest Territories of Canada (Great Slave Lake East Arm basin), the locations of this study. Integration of bulk and microanalytical methods (e.g., cathodoluminescence (CL), scanning electron microscopy (SEM), fluid inclusion microthermometry, secondary ion mass spectrometry (SIMS), and laser ablation inductively coupled mass spectrometry (LA-ICPMS)) was focused on these systems with the goal of updating the current model for this deposit style. The vein systems in the East Arm Basin occur over 55 km, and share similar microthermometric, isotopic, ore tenor and paragenetic characteristics. Fluid inclusion results indicates salinity (~18-23 wt% CaCl<sub>2</sub> equiv.) and minimum entrapment T (~170-250&deg;C) varied little with time during vein formation. An entrapment window between ~145 and 225&deg;C and 0.5 to 0.95 kbar is estimated for coeval brine and carbonic inclusions. Fluid &delta;<sup>18</sup>O values increased by as much as 10 &permil; at the onset of mineralization. Quartz-carbonate hosted fluid inclusions in mineralized veins are enriched in Ca-Sr-Ba-Mg-Mn-Pb-Zn but contain only low-ppm concentrations of ore metals. Primary coeval bitumen inclusions, in contrast, are significantly enriched in U-Ni-Co-Bi-Ag-Sb-As-Mo-Cu. Integration of all data types strongly suggests that the precipitation of metals and bitumen was triggered by isothermal mixing of <sup>18</sup>O-rich basinal brines and metal-rich bitumen particles or oil droplets; oxidation of this hydrocarbon phase resulted in metal precipitation. The basinal brines and associated metal-rich bitumen are thought to be derived from formly overlying outliers of the Athabasca -Hornby Bay -Thelon sedimentary basins that now outcrop ~300-1000 km away from the study areas. This work provides a direct confirmation for the involvement of basinal ore fluids, supporting recent models (i.e fluid mixing) and demonstrating hydrocarbons participated as metal transport agents.
dc.language.iso en en_CA
dc.publisher Halifax, N.S. : Saint Mary's University
dc.subject.lcc QE446.N7
dc.subject.lcsh Ore deposits -- Slave Province (N.W.T. and Nunavut).
dc.subject.lcsh Ore deposits -- Northwest Territories -- East Arm Basin
dc.subject.lcsh Veins (Geology) -- Slave Province (N.W.T. and Nunavut).
dc.subject.lcsh Veins (Geology) -- Northwest Territories -- East Arm Basin
dc.subject.lcsh Petrology -- Northwest Territories
dc.subject.lcsh Mineralogy -- Northwest Territories
dc.title The origin of polymetallic Ni-Co-As-Bi-Sb(-Ag-U) veins in the East Arm Basin and southern Slave Province, Northwest Territories en_CA
dc.type Text en_CA
thesis.degree.name Master of Science in Applied Science
thesis.degree.level Masters
thesis.degree.discipline Geology
thesis.degree.grantor Saint Mary's University (Halifax, N.S.)


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