Abstract
The chemistry of fluid inclusions in shallow (coexisting brine and carbon dioxide-bearing vapour inclusions) and deep (low salinity carbon dioxide±methane-rich aqueous fluids) intrusion-related gold systems in the Tintina Gold Belt, Alaska and Yukon, has been measured using proton induced x-ray emission (PIXE) in order to compare and contrast these different fluid types. Both the high and low salinity fluid inclusions have high K/Ca ratios (> 1) consistent with granite-derived or granite equilibrated fluids, and low Mn/Fe ratios (< 0.24) consistent with the reduced conditions in which the ore systems formed. Fluid inclusions in the shallow level deposits are characterized by higher base metals contents due to the greater abundance of chlorine. Nonetheless, the copper contents are significantly lower (< 1000 ppm) than those found in porphyry copper systems. Tungsten is more elevated in the low salinity carbon dioxide-bearing fluid inclusions consistent with high tungsten contents in deeper level deposits, and likely due to tungsten’s preference to form tungstate complexes rather than chloride complexes. Arsenic was found in both high and low salinity fluid inclusions, and may be explained by its ability to complex with other elements such as sulfur (e.g., thioarsenite) in addition to chlorine. Arsenic may be used as a proxy for gold due to their similar chemical behaviour and explain why both shallow and deep level deposits contain gold despite the diverse fluid types present.
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References
Baker T (2002) Emplacement depth and CO2-rich fluid inclusions in intrusion related gold deposits. Economic Geology 97:1109–1115
Baker T, Lang JR (2001) Fluid inclusion characteristics of intrusion-related gold mineralization, Tombstone-Tungsten magmatic belt, Yukon Territory, Canada. Mineralium Deposita 36:563–582
Baker T, Van Achterberg E, Ryan CG, Lang JR (2004) Composition of ore fluids in a magmatic-hydrothermal skarn deposit. Geology 32:117–120
Bakke AA (1995) The Fort Knox ‘porphyry’ gold deposit: structurally controlled stockwork and shear quartz vein, sulfide-poor mineralization hosted by a Late Cretaceous pluton, east-central Alaska. In: Schroeter TG (ed) Porphyry Deposits of the Northwestern Cordillera of North America. Canadian Institute of Mining and Metallurgy Special Volume 46:795–802
Bodnar RJ (1995) Fluid inclusion evidence for a magmatic source of metals in porphyry copper deposits. In: Thompson JFH (ed) Magmas, fluid and ore deposits. Mineralalogical Association Canada Short Course Series 23:139–152
Bottrell SH, Yardley BWD (1991) The distribution of Fe and Mn between chlorite and fluid: Evidence from fluid inclusions. Geochim Cosmochim Acta 55:241–242
Diment R (1996) Brewery Creek gold deposit. In: Yukon Exploration and Geology, 1995. Exploration and Geological Services Division, Yukon, Indian and Northern Affairs Canada, 89–97
Duncan RA (1999) Physical and chemical zonation in the Emerald Lake pluton, Yukon Territory. Unpublished M.Sc thesis, University of British Columbia, Vancouver
Goldfarb RJ, Ayuso R, Miller ML, Ebert SW, Marsh EE, Petsel SA, Miller LD, Bradley D, Johnson C, McClelland W (2004) The Late Cretaceous Donlin Creek Deposit, Southwestern Alaska—controls on epizonal formation. Economic Geology 99:643–671
Groves DI, Goldfarb RJ, Robert F, Hart CJR (2003) Gold deposits in metamorphic belts: Overview of current understanding, outstanding problems, future research and exploration significance. Economic Geology 98:1–30
Maloof TL, Baker T, Thompson JFH, (2001) The Dublin Gulch intrusion-hosted gold deposit, Tombstone plutonic suite, Yukon Territory, Canada. Mineralium Deposita 36:583–593
McCoy DM, Newberry RJ, Layer P, Dimarchi JJ, Bakke A, Masterman JS, Minehane DL (1997) Plutonic-related gold deposits of interior Alaska. Econ. Geol. Monog. 9:191–241
Phillips GN, Powell R (1993) Link between gold provinces. Economic Geology 88:1084–1098
Rombach CS, Newberry RJ (2001) Genesis and mineralization of the Shotgun deposit, southwestern Alaska. Mineralium Deposita 38:607–621
Seward TM, Barnes HL (1997) Metal transport by hydrothermal ore fluids. In: Barnes HL (ed) Geochemistry of Hydrorthermal Ore Deposits, 3rd. edition. Wiley, New York, 435–486
Smith MT, Thompson JFH, Bressler J, Layer P, Mortensen JK, Abe I, Takaoka H (1999) Geology of the Leise zone, Pogo property, eastcentral Alaska. Society Of Economic Geologists Newsletter 38:10
Thompson JFH, Sillitoe RH, Baker T, Lang JR, Mortensen JK (1999) Intrusion-related gold deposits associated with tungsten-tin provinces. Mineralium Deposita 34:323–334
Ulrich T, Gunther D, Heinrich CA (1999) Gold concentrations of magmatic brines and the metal budget of porphyry copper deposits. Nature 399: 676–679
Woods SA, Samson IM (2000) The hydrothermal geochemistry of tungsten in granitoid environments: I. Relative solubilities of ferberite and scheelite as function of T, P, pH, and mNaCl. Economic Geology 95:183–202
Yardley BWD, Banks DA, Barnicoat AC (2000) The chemistry of crustal brines: tracking their origins. In: Porter TM (ed) Hydrothermal Iron Oxide Copper-Gold and Related Deposits: A Global Perspective, vol. 1. PGC Publishing, Adelaide, 61–70
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Baker, T., Ryan, C. (2005). PIXE analysis of contrasting fluid inclusion types in intrusion-related gold systems of the Tintina Gold Province, Yukon, Alaska. In: Mineral Deposit Research: Meeting the Global Challenge. Springer, Berlin, Heidelberg. https://doi.org/10.1007/3-540-27946-6_223
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DOI: https://doi.org/10.1007/3-540-27946-6_223
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