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Genetic and exploration significance of the zinc number (100Zn/[Zn+Pb])in massive sulfide systems (CODES publication 1)

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Huston, DL and Large, RR (1986) Genetic and exploration significance of the zinc number (100Zn/[Zn+Pb])in massive sulfide systems (CODES publication 1). Technical Report. University of Tasmania, Hobart, Tasmania.

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Abstract

Comparison of the 100Zn/(Zn + Pb) ratio ( "zinc number") of various styles of mineralization in the Mt. Read Volcanics of Tasmania indicates that volcanogenic massive sulfide deposits have a restricted range of mean values (64 to 77) and low standard deviations (less than 15) while other mineralization styles have a broader, but lower, range of mean values (39 to 61) and higher standard deviations (greater than 26). The consistency of the zinc number, along with the Pb vs. Zn plots, suggests that zinc and lead were saturated in the metal deficient (mΣmetal< mH2S) hydrothermal fluids that deposited Rosebery and Hellyer. Trends in the zinc number between massive sulfides in the Mt. Read Volcanics indicate that concentrations of zinc and lead in the footwall volcanic source rocks did not control the zinc number of the deposits. The saturation of zinc and lead in mineralizing fluids may control the zinc number of most Phanerozoic volcanogenic massive sulfide deposits, but low concentrations of lead in the footwall volcanics of Cu-Zn type massive sulfide deposits probably control the zinc number for this class. The low means and high standard deviations of Cambrian vein deposits in the Mt. Read Volcanics, and Ordovician and Devonian deposits of the Dundas Trough, may be explained by a lack of zinc- lead saturation or by different complexing in the relevant hydrothermal fluids. The characteristic zinc number of volcanogenic massive sulfide deposits can be used to distinguish these deposits from other mineralization types in the Mt. Read Volcanics. Effective use of this simple technique requires a reasonable number of anomalous samples (minimum = 15) and an unoxidized sample medium (drill samples are preferable). In combination with geology and lead isotopes, the zinc number provides an excellent early screening of prospects.

Item Type: Report (Technical Report)
Publisher: University of Tasmania
Additional Information: © University of Tasmania 1986
Date Deposited: 22 Jul 2009 01:21
Last Modified: 18 Nov 2014 04:02
URI: http://eprints.utas.edu.au/id/eprint/8884
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