Evolution and source of ore fluids in the stringer system, Hellyer VHMS deposit, Tasmania, Australia: Evidence from fluid inclusion microthermometry and geochemistry

Abstract

The Hellyer deposit is a classic, large tonnage, high-grade, mound style volcanic-hosted massive sulphide (VHMS) deposit in the Cambrian Mt Read Volcanic belt of western Tasmania. In the footwall directly underlying the deposit, there is an extensively altered pipe which contains a well developed and preserved stringer zone. The vein paragenesis at Hellyer indicates that premineralization Stage 1 veins consist entirely of quartz, and occur throughout the alteration pipe. The synmineralization Stage 2 veins are the most abundant veins in the stringer zone and consist of three sub-stages: Stage 2A veins of crustiform quartz, pyrite, and carbonate with minor amounts of chalcopyrite, sphalerite ..