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A Review of Iron Oxide Copper-Gold Deposits, with Focus on the Wernecke Breccias, Yukon, Canada, as an Example of a Non-Magmatic End Member and Implications for IOCG Genesis and Classification

2007; Volume: 16; Issue: 3-4 Linguagem: Inglês

10.2113/gsemg.16.3-4.209

1878-6715

J. Hunt, Tim Baker, Derek J. Thorkelson,

Geomagnetism and Paleomagnetism Studies

Research Article| July 01, 2007 A Review of Iron Oxide Copper-Gold Deposits, with Focus on the Wernecke Breccias, Yukon, Canada, as an Example of a Non-Magmatic End Member and Implications for IOCG Genesis and Classification J.A. Hunt; J.A. Hunt † 1Yukon Geological Survey, Whitehorse, Yukon, Y1A 2C6.2Economic Geology Research Unit, James Cook University, Queensland, Australia, 4811.3Currently at CODES, University of Tasmania, Private Bag 79, Hobart, Tasmania, Australia, 7001. †Corresponding Author: E-mail: julie.hunt@utas.edu.au Search for other works by this author on: GSW Google Scholar T. Baker; T. Baker 2Economic Geology Research Unit, James Cook University, Queensland, Australia, 4811. Search for other works by this author on: GSW Google Scholar D.J. Thorkelson D.J. Thorkelson 4Department of Earth Sciences, Simon Fraser University, Burnaby, British Columbia, V5A 1S6. Search for other works by this author on: GSW Google Scholar Exploration and Mining Geology (2007) 16 (3-4): 209–232. https://doi.org/10.2113/gsemg.16.3-4.209 Article history received: 16 Feb 2006 accepted: 25 Aug 2007 first online: 09 Mar 2017 Cite View This Citation Add to Citation Manager Share Icon Share MailTo Twitter LinkedIn Tools Icon Tools Get Permissions Search Site Citation J.A. Hunt, T. Baker, D.J. Thorkelson; A Review of Iron Oxide Copper-Gold Deposits, with Focus on the Wernecke Breccias, Yukon, Canada, as an Example of a Non-Magmatic End Member and Implications for IOCG Genesis and Classification. Exploration and Mining Geology 2007;; 16 (3-4): 209–232. doi: https://doi.org/10.2113/gsemg.16.3-4.209 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 SocietyExploration and Mining Geology Search Advanced Search Abstract New data indicate Wernecke Breccia-associated iron oxide copper-gold (IOCG) deposits likely formed from moderate-temperature, high-salinity, non-magmatic brines. The breccias formed in an area underlain by a sedimentary sequence that locally contained evaporites (potential source of chloride and possibly sulfur) and was thick enough to produce elevated fluid temperatures. Metals (Fe, Cu, Co, U) were probably derived from host strata, transported as chloride complexes, and precipitated due to changes in fluid temperature and pressure during brecciation. These new data suggest that the spectrum of genetic models for IOCG deposits that typically invoke formation from magmatic or hybrid magmatic–non-magmatic fluids should be expanded to include those systems that formed in a non-magmatic environment. Modifications to the definition of IOCG systems are proposed that reflect the degree of involvement of magmatic and/or non-magmatic fluids and the nature of the mineralizing environment. A division into magmatic, non-magmatic, and hybrid magmatic–non-magmatic IOCG types is suggested. Typical magmatic end-member IOCG deposits include Lightning Creek and Eloise, Australia. Hybrid magmatic–non-magmatic IOCG examples include Ernest Henry and Olympic Dam, Australia. The Wernecke Breccia and Redbank deposits are suggested as possible representatives of non-magmatic IOCG end members. End-member magmatic IOCG deposits have similarities to some porphyry deposits, whereas non-magmatic IOCG end members share characteristic with some sediment-hosted Cu deposits, suggesting that the range of IOCG deposits may form a link between intrusive- and sediment-related deposits. You do not have access to this content, please speak to your institutional administrator if you feel you should have access.