Evolving electrical SCLM models in South Australia and their … · 2019-02-05 · Evolving...

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: DEM@sa.gov.au