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Permanent link (DOI): https://doi.org/10.7939/R3N873730

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Orogenic Gold mineralization at 3Ace and Geochemical Characteristics of Quartz Monzonite Dikes at Sprogge, South-east Yukon Open Access

Descriptions

Other title
Subject/Keyword
3Ace
Sprogge
orogenic gold
Type of item
Thesis
Degree grantor
University of Alberta
Author or creator
Whelan, Shaunaugh C.
Supervisor and department
Gleeson, Sarah (Earth and Atmospheric Science)
Examining committee member and department
Waldron, John (Earth and Atmospheric Science)
Muehlenbachs, Karlis (Earth and Atmospheric Science)
Department
Department of Earth and Atmospheric Sciences
Specialization

Date accepted
2014-07-15T11:12:15Z
Graduation date
2014-11
Degree
Master of Science
Degree level
Master's
Abstract
3Ace and Sprogge are two Au occurrences in the southeast Yukon, Selwyn Basin. Gold mineralization at 3Ace was previously believed to be intrusion-related, however, recent petrography and geochemical analysis show mineralization to be associated with mid- Cretaceous orogenesis. Gold occurs along fractures within quartz veins hosted in metasediments of the Neoproterozoic Yusezyu Formation of the Selwyn Basin, and precipitated from low salinity, CO2-rich acidic fluids at temperatures around 300°C. Stable isotopes show evidence of fluid mixing and a significant meteoric water component in the system, but a magmatic contribution cannot be ruled out. X-ray diffraction was used to define alteration assemblages associated with Au. Geochemical analysis was also carried out at Sprogge to garner a better understanding of the regional geology and potential for mineralization. Radiogenic isotopic compositions of quartz monzonite dikes at Sprogge yielded estimated ages between 95.7 ± 2.0 Ma and 103.5 ± 1.2 Ma. Whole rock geochemical analyses indicate the quartz monzonite dikes were produced from similar petrogenetic processes to the Hyland and Tungsten plutonic suites.
Language
English
DOI
doi:10.7939/R3N873730
Rights
Permission is hereby granted to the University of Alberta Libraries to reproduce single copies of this thesis and to lend or sell such copies for private, scholarly or scientific research purposes only. Where the thesis is converted to, or otherwise made available in digital form, the University of Alberta will advise potential users of the thesis of these terms. The author reserves all other publication and other rights in association with the copyright in the thesis and, except as herein before provided, neither the thesis nor any substantial portion thereof may be printed or otherwise reproduced in any material form whatsoever without the author's prior written permission.
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