Postgraduate Profiles

David Murphy

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Thesis: Hydrothermal alteration associated with gold mineralization in hypogene and supergene mafic/intermediate igneous rocks, Pajingo Epithermal System, Queensland, Australia; implications for exploration of weathered rocks

Many geological processes change rock compositions through the addition and removal of constituents. This study investigates material transfer associated with hydrothermal alteration and superimposed weathering.

Compositional data represented as Pearce element ratios recapture system size information, and so are amenable to algebraic/geometric techniques, which provide insights into material transfer processes.

Research is focussed on model development and application to data from fresh and weathered rocks from the Vera-Nancy gold deposit, Pajingo Epithermal System, Queensland.

Why my research is important

Large mineralised systems are commonly associated with extensive, intense and characteristic wall-rock alteration. The ability to objectively recognise and describe alteration and its weathered products, such as are often encountered during exploration, provides a target prioritisation tool.

The aim of this research is to characterise weathered hydrothermal alteration in mafic-intermediate rocks at one deposit, then test the derived exploration parameters elsewhere.


Jan 2004

Jul 2007