Rose Clarke, Postgraduate Researcher

Post-subduction magmatism and mineralisation: the Tuvatu gold deposit, Fiji

Contact Details

Project Overview

The Tuvatu deposit in Fiji has unusually high grades and tonnages of both gold and tellurium, the latter of which is becoming increasingly important with the emergence of solar energy and high speed electronic technologies.

The deposit is strange as it has experienced limited silicification, fluids have a magmatic signature and the deposit is also vanadium rich. The aim of this project therefore is to better our understanding of how this deposit formed, looking at:

  • The chemistry of magmas and parent rocks
  • The mineralogy of the ore itself
  • Structural controls in the area

In order to create a process based model for the evolution of the mineralisation, which may help understand and potentially predict other similar deposits.

Research Theme

Solid Earth

Research Questions

  1. Why do alkaline, post-subduction magmas host exceptionally gold-tellurium rich ores?
  2. Is the hydrothermal nature of Tuvatu controlled by the potassic and alkaline nature of the rocks?
  3. Do the potassic post-subduction rocks in Fiji carry enhanced gold and tellurium to the crust?

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