Geological controls on the distribution of arsenic in the Perseverance nickel deposit, Leinster, WA
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The Perseverance deposit is a deformed ultramafic disseminated Ni-sulphide orebody. Arsenic is found in gersdorffite (NiAsS) and cobaltite (CoAsS). Arsenic-bearing minerals occur within massive sulphide and altered ultramafic disseminated sulphide rocks located at the base of the ultramafic complex. Cobaltite crystallisation temperature ranges from 500°C-550°C while gersdorffite ranges from 250°C-550°C. Arsenic addition occurred prior to regional metamorphism (500 - 550°C) but the arsenic source is obscured by subsequent metamorphic and metasomatic events.
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