Mineral systems on the margin of cratons: Albany-Fraser Orogen / Eucla Basement case study

The Challenge

Recent discoveries in the Albany–Fraser region demonstrate the previously under-appreciated potential of high-grade metamorphic rocks to host major ore bodies.

Mineralisation in high-grade rocks is associated with different signatures to those underlying common exploration models. Efficient targeting of mineralisation in high-grade regions requires development of new approaches to geological exploration.

Key Findings

Deformation at the margins of ancient continental fragments is associated with geological discontinuities that focus fluids and heat and, under favourable circumstances, may become mineralised corridors.

The Albany–Fraser region has a deep compositional grain reflecting common inheritance with the richly-endowed Yilgarn Craton.

Distinctive variations in the geochemistry and sulfur isotopes incorporated within the metamorphosed rocks record a protracted history of fluid flow and mineralisation predating major deformation of the Albany–Fraser Orogen.

Benefit to WA

This work delivers enhanced understanding of the development and expression of mineralisation in the emerging Albany–Fraser mineral province, and highlights a number of prospective areas.

These insights will help reduce exploration risk in the region, and encourage industry investment in finding the next generation of ore bodies in Western Australia.

Keywords: Albany-Fraser Orogen, geochronology, isotope geology, sulphur isotopes, mineral systems