Albany–Fraser Orogen magnetotelluric (MT) survey 2013–14

3D modelling results displayed along four 2D profile traces
3D modelling results displayed along four 2D profile traces

The Albany–Fraser Orogen is located along the southern margin of the Yilgarn Craton and is host to the world-class Tropicana orogenic gold deposit and Nova–Bollinger mafic-hosted Ni–Cu deposit. Both deposits are associated with major crustal structures. With support from the Exploration Incentive Scheme (EIS), an MT survey was conducted along four main profiles, their locations chosen to complement the deep crustal seismic reflection lines. A total of 163 magnetotelluric soundings was conducted in the Albany–Fraser Orogen during 2013. These soundings have provided 2D and 3D conductivity models of the crust and uppermost lithospheric mantle. The models reveal a resistive upper crust that is crosscut by several near-vertical low-resistivity zones, which in some cases can be correlated with the location of major shear zones. Preliminary results were presented at a workshop in 2014, with extended abstracts presented in GSWA Record 2014/6 Albany–Fraser Orogen seismic and magnetotelluric (MT) workshop 2014: extended abstracts.

Details of the processing and results can be found in GSWA Report 189 A magnetotelluric survey across the east Albany–Fraser Orogen, Western Australia.

Contact

For further information contact:
3D.geoscience@dmirs.wa.gov.au