- ISSN: 2202-0586
- E-ISSN:
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oa Magnetotelluric Survey Across the Central Eyre Peninsula
- Australian Society of Exploration Geophysicists
- Source: ASEG Extended Abstracts, Volume 2010, Issue ASEG2010 - 21st Geophysical Conference, Dec 2010, p. 1 - 1
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- 01 Dec 2010
Abstract
Magnetotelluric (MT) measurements were undertaken at 40 broadband (0.01s – 500s) and 12 long-period (10s-10000s) stations across the central-eastern Eyre Peninsula, South Australia, using Auscope MT equipment. Typical site spacing is of the order of 15km in between sites for the long-period stations and and 3-10km for the broadband stations. This ensures sufficient coverage to map the upper crustal to upper mantle structures underneath central Eyre Peninsula.
The profile extends south of the Gawler Range Volcanics and crosses the Archaean Sleaford Complex, the Hutchinson Group and the Donington Suite from west to east. The 2D MT profile also crosses the location of the postulated Eyre Peninsula Anomaly (White and Milligan, 1984, Kusi et al., 1998, Thiel et al., 2005) as well as the Kalinjala Shear Zone in the eastern part of the profile (Vassallo and Wilson, 2002, Thiel et al., 2005).
Dimensionality analysis and strike determination has been carried out using phase tensor analysis (Caldwell et al., 2004). Subsequently, data influenced by 3D effects could be discarded and the remaining data were inverted for 2D structure using a code by Rodi and Mackie (2001). 2D inverse modelling of the broadband and long-period data indicates a resistive crust in the western part of the profile representing the Archaean Sleaford Complex. Along its eastern margin extends a major conductive crustal boundary in the central part of the profile.
Technical Area: Minerals exploration, magnetotellurics
PRESENTER PROFILE (100 words in sentence format):
Stephan Thiel is a IMER Research Fellow at the Center of Tectonics, Resources and Exploration (TraX) at University of Adelaide. Stephan completed his Masters at the Freiberg University of Mining and Technology, Germany and obtained his PhD at the University of Adelaide. Stephan’s speciality is the analysis and modelling of electromagnetic data to define large-scale lithospheric structures, mineral systems and geothermal areas. Email:[email protected]
