Constraining fluid-fluid and fluid-rock interaction with noble gases in Australia ore deposits

Kendrick, M.A., Phillips, D., Honda, M., Oliver, N.H.S., and Walshe, J.L. (2010) Constraining fluid-fluid and fluid-rock interaction with noble gases in Australia ore deposits. In: Proceedings of the 10th Biennial Meeting of the the SGA 2009 (2), pp. 722-724. From: 10th Biennial Meeting of the SGA 2009, 17-20 August 2009, Townsville, QLD, Australia.

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Abstract

Traditional isotope systems are variably successful at constraining either fluid sources or fluidrock interaction. In contrast, new analyses of multiple noble gas isotopes in fluid inclusions demonstrate that the noble gases can be used to simultaneously constrain both fluid sources and the extent of fluid-rock interaction. This is possible because noble gases are transported by crustal fluids, and they collect in the fluid phase during fluid-rock interaction instead of undergoing isotopic exchange. As a result, fluid-rock interaction produces noble gas mixing arrays that range from the wall-rock composition to the fluid’s original source reservoir. In addition, targeted analysis of discrete fluid inclusion assemblages (e.g. H₂O, CO₂ and CH₄) within a single ore deposit or metamorphic terrane can reveal the nature of fluid-fluid interaction. This is because volatiles with a common origin lie along a single mixing line, whereas volatiles derived independently define discrete mixing arrays. In this talk we concentrate on the isotopes of Ne and Ar, and illustrate the above concepts with data from the U-rich Mary Kathleen Fold Belt, northeast Australia, and the St Ives Goldfield, Western Australia.

Item ID: 27697
Item Type: Conference Item (Research - E1)
ISBN: 978-0-9805-5868-5
Keywords: fluid inclusion, noble gas, gold, uranium
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Date Deposited: 05 Jul 2013 04:33
FoR Codes: 04 EARTH SCIENCES > 0402 Geochemistry > 040203 Isotope Geochemistry @ 100%
SEO Codes: 84 MINERAL RESOURCES (excl. Energy Resources) > 8401 Mineral Exploration > 840105 Precious (Noble) Metal Ore Exploration @ 50%
84 MINERAL RESOURCES (excl. Energy Resources) > 8401 Mineral Exploration > 840199 Mineral Exploration not elsewhere classified @ 50%
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