Chlorine substitution in natural sphalerites

Williams, Patrick, Evins, Paul, Blake, Kevin L., Barrie, Craig, Boyle, Alan, and Semler, Nicola (2009) Chlorine substitution in natural sphalerites. In: Proceedings of the 10th Biennial Meeting of the the SGA 2009 (1) pp. 269-271. From: 10th Biennial Meeting of the SGA 2009, 17-20 August 2009, Townsville, QLD, Australia.

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Reports of chloride substitution in common natural sulphides are lacking but are predictably influenced by key variables in hydrothermal systems including T, pH, Eh aCl-, and aHS-. Materials scientists have long recognized that "II-VI compounds" (e.g. sphalerite) may accommodate halogens with charge balance maintained by cation deficiencies (e.g. Zn1- 0.5xS1-xClx). The majority of around 200 analyses of sphalerite from the Century Zinc mine (NW Queensland) reveal chlorine above electron microprobe detection limits with a maximum of ca 2200 ppm. The analyses support the Zn deficiency substitution although a small subset reveal a 1:1 (molar) correlation of Cl with the highest (Cu+Ag) implying an additional coupled substitution mechanism. Colloform sphalerite from the Galmoy mine (Ireland) has variable concentrations of Cl up to 6000 ppm in growth zones also displaying variations of Fe and Cd. The chlorine content of sphalerite may therefore provide a new tool to characterize the evolution of conditions in hydrothermal ore deposits.

Item ID: 11862
Item Type: Conference Item (Research - E1)
ISBN: 978-0-9805586-8-5
Keywords: sphalerite; chlorine; substitution mechanisms; Century mine; Galmoy mine
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Conference theme "Smart Science for Exploration and Mining"

Date Deposited: 10 Sep 2010 01:00
FoR Codes: 04 EARTH SCIENCES > 0403 Geology > 040307 Ore Deposit Petrology @ 100%
SEO Codes: 84 MINERAL RESOURCES (excl. Energy Resources) > 8401 Mineral Exploration > 840108 Zinc Ore Exploration @ 100%
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