Title: How magnetotelluric data from multiscale surveys can help to image the footprint of mineral systems in covered terranes
Date: Tuesday October 10th at 5:00 PM EST/ 7 AM AEST
Speaker: Wenping Jiang, Geoscience Australia
Location: virtual, please register here
Magnetotellurics is one of a few techniques that can provide multiscale datasets to understand large mineral systems. The Australian Lithospheric Architecture Magnetotelluric Project (AusLAMP) is a collaborative national survey that acquires long-period magnetotelluric data on a half-degree grid spacing across Australia. We have used AusLAMP as a first-order reconnaissance survey to resolve large-scale lithospheric architecture for mapping areas of mineral potential in Australia. AusLAMP results show a remarkable connection between conductive anomalies and giant mineral deposits in known highly endowed mineral provinces. Similar conductive features are mapped in greenfield areas where mineralisation has not been previously recognised. In these areas we then undertake higher-resolution infill magnetotelluric surveys to refine the geometry of major structures, and to investigate if deep conductive structures are connected to the near surface by fluid pathways. Integration of conductivity structures with deep seismic reflection data revealed a favourable crustal architecture linking the lower, fertile source regions with potential depositional sites in the upper crust. In addition to these insights, interpretation of high frequency magnetotelluric data helps to characterise cover and assist with selecting targets for stratigraphic drilling.
We demonstrate that integration of geophysical data from multiscale surveys is an effective approach to scale reduction during mineral exploration in covered terranes.
Author Biography:Dr Wenping Jiang joined Geoscience Australia in 2012 after completing a PhD degree from the University of Sydney. She is a senior geophysicist in the Mineral Systems Branch in Geoscience Australia. Her professional focus is on using magnetotelluric data and other geophysical data to improve the understanding of geology and mineral resource prospectivity.
November - Stanislawa Hickey, Mira Geoscience, Title: Advances in open-source 3D inversion of AFMAG data; A case study at the Méquillon deposit in Nunavik, Quebec
January – Jim Craven- TBD
February – Omid Bagherpour, BHP- TBD