Regional-scale Proterozoic IOCG-mineralized breccia systems: examples from the Wernecke Mountains, Yukon, Canada
Hunt, Julie, Baker, Timothy, and Thorkelson, Derek (2005) Regional-scale Proterozoic IOCG-mineralized breccia systems: examples from the Wernecke Mountains, Yukon, Canada. Mineralium Deposita, 40 (5). pp. 492-514.
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A large scale Proterozoic breccia system consisting of numerous individual breccia bodies, collectively known as Wernecke Breccia, occurs in north-central Yukon Territory, Canada. Breccias cut Early Proterozoic Wernecke Supergroup sedimentary rocks and occur throughout the approximately 13 km thick deformed and weakly metamorphosed sequence. Iron oxide–copper–gold ± uranium ± cobalt mineralization is associated with the breccia bodies and occurs as veins and disseminations within breccia and surrounding rocks and locally forms the breccia matrix. Extensive sodic and potassic metasomatic alteration occurs within and around breccia bodies and is overprinted by pervasive calcite and dolomite/ankerite, and locally siderite, alteration, respectively. Multiple phases of brecciation, alteration and mineralization are evident. Breccia bodies are spatially associated with regional-scale faults and breccia emplacement made use of pre-existing crustal weaknesses and permeable zones. New evidence indicates the presence of metaevaporitic rocks in lower WSG that may be intimately related to breccia formation. No evidence of breccia-age magmatism has been found to date.
|Item Type:||Article (Refereed Research - C1)|
|Keywords:||Wernecke Breccia; IOCG; Proterozoic; iron oxide–copper–gold; Yukon|
|FoR Codes:||04 EARTH SCIENCES > 0403 Geology > 040306 Mineralogy and Crystallography @ 100%|
|SEO Codes:||84 MINERAL RESOURCES (excl. Energy Resources) > 8402 Primary Mining and Extraction Processes of Mineral Resources > 840204 Mining and Extraction of Iron Ores @ 100%|
|Deposited On:||08 Mar 2010 14:27|
|Last Modified:||18 Oct 2013 00:51|
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