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Erratum published on 20 September 2017, see Minerals 2017, 7(9), 175.

Open AccessArticle
Minerals 2017, 7(6), 100; https://doi.org/10.3390/min7060100

The Hydrothermal Fluid Evolution of Vein Sets at the Pipeline Gold Mine, Nevada

1
Department Earth and Environmental Science, New Mexico Institute of Mining and Technology, 801 Leroy Place, Socorro, NM 87801, USA
2
Department Earth Sciences, Brock University, 1812 Sir Isaac Brock Way, St Catharines, ON L2S 3A1, Canada
*
Author to whom correspondence should be addressed.
Academic Editor: Martin Feely
Received: 9 May 2017 / Revised: 7 June 2017 / Accepted: 9 June 2017 / Published: 13 June 2017
(This article belongs to the Special Issue Fluid Inclusions: Study Methods, Applications and Case Histories)
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Abstract

The origin of sediment-hosted Nevada gold deposits has been highly debated, especially regarding the relative contribution of multiple mineralizing events, particularly relating to the Cretaceous. We examined the Pipeline gold mine in north-central Nevada, focusing on data from the four vein sets in this atypical deposit where there is evidence for Cretaceous gold mineralization. Only the third, a quartz-sericite-pyrite-calcite vein set, has any link with the alteration styles and gold mineralization within the Pipeline deposit. Our geochemical results from fluid inclusion microthermometry and gas analysis show that the fluids from which quartz deposited were sourced from condensing magmatic volatiles and were trapped at ~300 °C and 2 kbar lithostatic pressure (~8 km). 40Ar/39Ar dating of sericite demonstrates that the quartz-sericite-pyrite veins formed at ~92 Ma, matching the dates of gold-associated epigenetic illite. Ore fluids enriched in CO2 and H2S caused decarbonation thereby releasing Fe2+ that reacted with H2S to form pyrite. Decreasing H2S destabilized gold bisulfide complexes and deposited gold. We conclude that this process can occur in a single Cretaceous event in advance of potential Tertiary mineralization. View Full-Text
Keywords: fluid inclusions; gas analysis; stable isotopes; argon geochronology; Nevada; gold fluid inclusions; gas analysis; stable isotopes; argon geochronology; Nevada; gold
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Blamey, N.J.; Campbell, A.R.; Heizler, M.T. The Hydrothermal Fluid Evolution of Vein Sets at the Pipeline Gold Mine, Nevada. Minerals 2017, 7, 100.

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