Reflectance spectroscopy and alteration assemblages at the Leven Star gold deposit, Victoria, Australia

S J Travers, C J L Wilson

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Abstract

Hylogger-2 reflectance spectroscopy data from two drill holes at the Leven Star gold deposit, provides an insight into the hydrothermal alteration associated with vein sets and faults that host gold mineralisation. The metasedimentary host rock is a biotite-rich hornfels, which overprints a regional greenschist facies metamorphism. Gold mineralisation is associated with quartz (±carbonate) stockwork-breccia zones. HyLogging short-wave infrared reflectance spectra detected carbonates, chlorites, epidote (propylitic: carbonatisation, chloritisation, epidote), muscovite (phyllic/sericitic) and kaolinite, illite, ammonium alunite, montmorillonite and dickite (intermediate argillic alteration) assemblages that were confirmed using petrographic observations, drill core and geochemical data. The gold occurs within a sulfidation halo with carbonate phases (ankerite–siderite–dolomite) in structurally controlled veins and faults, which also host a late Sb–As–Bi–Cu–W assemblage, attributed to an intrusion-related style of mineralisation superimposed on a hydrothermal orogenic gold event.
Original languageEnglish
Pages (from-to)873-882
Number of pages10
JournalAustralian Journal of Earth Sciences
Volume62
Issue number7
DOIs
Publication statusPublished - 2015

Keywords

  • hydrothermal alteration
  • HyLogging™
  • Lachlan Orogen
  • Leven Star gold deposit
  • reflectance spectroscopy
  • Victoria

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