Stephan Thiel1,2
Kate Robertson1,2, Graham Heinson2 , Bruce Goleby 3
1Geological Survey of South Australia2The University of Adelaide3OPM Consulting
Evolving electrical SCLM models in South Australia and their implications
AusLAMP- the Australian Lithospheric
Architecture Magnetotelluric Project
Map from Geoscience Australia website
Induction Arrows
Duan & Kyi, 2018 AusLAMP Victoria Data
Duan & Kyi, 2018 AusLAMP Victoria Data
1000s phase tensor ellipses
Wang et al., 2014
Tasmania Model kindly provided by Tom Ostersen, U Tas
30 km
Total Magnetic Intensity Bouguer Gravity Electrical Resistivity (30 km)
Electrical Resistivity with Copper Occurrences
Musgrave Province
• Area of intraplate deformation
• At the triple junction between WAC, NAC, SAC
• Interesting for mineralization associated with Giles Complex, e.g. Ni potential of Nebo Babel
• Central Australia largely dominated by EW trending structure due to NS compression, decoupled from western or eastern Australia
• 1.6 Ma ages throughout, subsequent deformation events younging to the west.
Gawler Craton
CoompanaProvince
Musgrave Province
MundrabillaShear zone
Upper crustal model slices.
Nebo Babel
Mid-lower crust model slices. East west trend.Follows the gravity signature, Moho offset?
Aitken et al., 2009
Extending AusLAMP across the continental shelf area
Images from Geoscience Australia
Planning of first trial in South Australian waters
20 km
Curtis and Thiel, 2018, Precam Res
MT Data available on SARIG
• 906 new MT sites uploaded
• 406 AusLAMP MT sites
• 167 Eucla-Gawler MT sites
• 329 Olympic Domain MT sites
Acknowledgements - The AusLAMP Field Crew
Acknowledgements
• AusLAMP SA funded by GSSA, GA, NCRIS
• Liejun Wang for providing his Australia conductivity model
• Tom Ostersen for providing his Tasmanian models
• Geoscience Australia made Victoria AusLAMP and station locations available
• Ben Kay for his Curnamona model, NSW sites funded by GSNSW
• Many personnel from GSSA who helped with data upload and delivery
• The many field personnel who collected the MT data
• Traditional Owners and landholders for allowing us on their land
• Our models were run using the National Computational Infrastructure
• Images produced with GMT, MTpy and 3Dgrid
Disclaimer
The information contained in this presentation has been compiled by the Department for Energy and Mining (DEM) and originates from a variety of sources. Although all reasonable care has been taken in the preparation and compilation of the information, it has been provided in good faith for general information only and does not purport to be professional advice. No warranty, express or implied, is given as to the completeness, correctness, accuracy, reliability or currency of the materials.
DEM and the Crown in the right of the State of South Australia does not accept responsibility for and will not be held liable to any recipient of the information for any loss or damage however caused (including negligence) which may be directly or indirectly suffered as a consequence of use of these materials. DEM reserves the right to update, amend or supplement the information from time to time at its discretion.
Contact
Dr Stephan Thiel
Department for Energy and Mining – Mineral Resources DivisionGeological Survey of South Australia
Level 12, 11 Waymouth StreetAdelaide, South Australia 5000
T: +61 8 8463 3000E: [email protected]