Pyrite chemistry and S isotope systematics associated with paragenesis of epithermal-style gold mineralization in the Eastern Cobequid Highlands, Nova Scotia, Canada

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dc.contributor.advisor Hanley, Jacob James, 1976-
dc.creator Gee, Kali Jolane
dc.date.accessioned 2019-06-06T15:02:57Z
dc.date.available 2019-06-06T15:02:57Z
dc.date.issued 2019
dc.identifier.uri http://library2.smu.ca/handle/01/28916
dc.description 1 online resource (ix, 86 pages) : illustrations (some colour), colour maps
dc.description Includes abstract and appendix.
dc.description Includes bibliographical references (pages 83-85).
dc.description.abstract Within the northeastern Cobequid Highlands (CH), Nova Scotia, Canada recent bedrock mapping and bulk rock geochemistry have identified a potential epithermal Au system. The Warwick Mountain area shows the most potential for Au mineralization with two zones of intensely silicified and sulphidized basalt identified. Assays show anomalous As, Sb, Cd, W, Hg, with Au concentrations up to ~660 ppb. Trace element chemistry and S isotope systematics of sulphide minerals are used to track deposit evolution and epithermal processes at a variety of scales, and develops exploration criteria using these data. The host rock setting, enrichments in bulk rock Au, As, Sb, and Hg, and sulphide mineralogy are consistent with a low sulphidation epithermal Au style of mineralization. The bulk S (as mainly pyrite) correlates to bulk &delta;<sup>34</sup>S<sub>VCDT</sub>, possibly as a function of sulphate content enriched during sample weathering in core. The As content of pyrite correlates weakly to in-situ &delta;<sup>34</sup>S<sub>VCDT</sub> (by SIMS) in pyrite with As-rich zones often showing high &delta;<sup>34</sup>S<sub>VCDT</sub>, suggesting that <sup>34</sup>S enrichment and As enrichment were coupled. Bulk &delta;<sup>34</sup>S<sub>VCDT</sub> correlates to in-situ &delta;<sup>34</sup>S<sub>VCDT</sub>but bulk &delta;<sup>34</sup>S<sub>VCDT</sub> values are consistently higher by several ‰, suggesting partial oxidation of sulphides to sulphates and preferential loss of <sup>32</sup>S in core during long-term storage (degassing, removal by rain water?). Pyrite grains with rare, late overgrowths showing very high &delta;<sup>34</sup>S<sub>VCDT</sub> values are attributed to sulphide derived from the reduction of seawater sulphate. There are systematic variations in As and &delta;<sup>34</sup>S<sub>VCDT</sub> in surface samples and a few core samples. The biggest variation between core and rim &delta;<sup>34</sup>S<sub>VCDT</sub> to more negative values occurs at the Nuttby Mountain occurrence, where late enrichment in Au, Ag, As, and Sb occurs in the rims of pyrite grains. Similar rim enrichment in Au was observed in some pyrite from drill core. en_CA
dc.language.iso en en_CA
dc.publisher Halifax, N.S. : Saint Mary's University
dc.title Pyrite chemistry and S isotope systematics associated with paragenesis of epithermal-style gold mineralization in the Eastern Cobequid Highlands, Nova Scotia, Canada en_CA
dc.type Text en_CA
thesis.degree.name Bachelor of Science (Honours Geology)
thesis.degree.level Undergraduate
thesis.degree.discipline Geology
thesis.degree.grantor Saint Mary's University (Halifax, N.S.)


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