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Uncloaking invisible gold: use of nanosims to evaluate gold, trace elements, and sulfur isotopes in pyrite from Carlin-type gold deposits

Citation

Barker, SLL and Hickey, KA and Cline, JS and Dipple, GM and Kilburn, MR and Vaughan, JR and Longo, AA, Uncloaking invisible gold: use of nanosims to evaluate gold, trace elements, and sulfur isotopes in pyrite from Carlin-type gold deposits, Economic Geology, 104, (7) pp. 897-904. ISSN 0361-0128 (2009) [Refereed Article]

Copyright Statement

Copyright 2009 Economic Geology

DOI: doi:10.2113/econgeo.104.7.897

Abstract

One-hundred-nm-resolution secondary ionizing mass spectrometry (nanoSIMS) was used to determine the distribution of Au, Cu, As, Sb, and S, and stable isotopes of S (34S/32S) in gold-bearing pyrite from two refractory Carlin-type gold deposits: West Banshee, northern Carlin Trend, and Turquoise Ridge, Getchell Trend, located in northern Nevada. NanoSIMS maps reveal that gold occurs in two discrete episodes in each deposit. Elevated gold concentrations correlate with elevated concentrations of As, Sb, Cu Te, and lower 34S/32S ratios, compared to periods when gold was not deposited. Precipitation of elevated gold and trace elements at West Banshee was followed by precipitation of pyrite with lower gold concentrations, whereas at Turquoise Ridge precipitation of trace element-rich pyrite was followed by precipitation of late ore-stage minerals. These NanoSIMS results are consistent with formation of the deposits by the episodic incursion of gold-rich fluids into hydrothermal systems otherwise dominated by gold-poor fluids. Such gold-rich fluid pulses may be related to incursions of magmatic fluid, which have been shown to have high concentrations of gold, arsenic, and copper in porphyry and high-sulfidation epithermal systems.

Item Details

Item Type:Refereed Article
Keywords:nanoSIMS, Carlin, pyrite, gold, arsenian pyrite
Research Division:Earth Sciences
Research Group:Geology
Research Field:Resource geoscience
Objective Division:Mineral Resources (Excl. Energy Resources)
Objective Group:Primary mining and extraction of minerals
Objective Field:Mining and extraction of precious (noble) metal ores
UTAS Author:Barker, SLL (Dr Shaun Barker)
ID Code:129469
Year Published:2009
Web of Science® Times Cited:124
Deposited By:CODES ARC
Deposited On:2018-11-30
Last Modified:2019-01-15
Downloads:0

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