Authors / CoAuthors
Crowe, M.C.A. | Heinson, G. | Dhu, T.
Abstract
Unconformity-type uranium deposits are high-grade and constitute over a third of the world's uranium resources. The Cariewerloo Basin, South Australia, is a region of high prospectivity for unconformity-related uranium as it contains many similarities to an Athabasca-style unconformity deposit. These include features such as Mesoproterozoic red-bed sediments, Paleoproterozoic reduced crystalline basement enriched in uranium (~15-20 ppm) and reactivated basement faults. An airborne electromagnetic (AEM) survey was flown in 2010 using the Fugro TEMPEST system to delineate the unconformity surface at the base of the Pandurra Formation. However highly-conductive regolith attenuated the signal in the northern and eastern regions, requiring application of deeper geophysical methods. In 2012 a magnetotelluric (MT) survey was conducted along a 110 km transect of the north-south trending AEM line. MT data were collected at 29 stations and successfully imaged the depth to basement, and additionally providing evidence for deeper fluid pathways. The AEM data were integrated into the regularisation mesh as a-priori information generating an AEM constrained resistivity model and also correcting for static shift. The AEM constrained resistivity model best resolved resistive structures, allowing strong contrast with conductive zones.
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nonGeographicDataset
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75421
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131-139 Grenfell Street GPO Box 1264
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- External PublicationAbstract
- Australian and New Zealand Standard Research Classification (ANZSRC)
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- Electrical and Electromagnetic Methods in Geophysics
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- Published_Internal
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2013-01-01T00:00:00
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I undertook this project as an honours student at the University of Adelaide supervised by Professor Graham Heinson. This project was funded by Department of Manufacturing, Innovation, Trade, Resources and Energy, South Australia and was co-supervised with Tania Dhu (now at NT Geological Survey). I am presenting this research as an oral presentation at the ASEG-PESA Conference in August. I have since graduated from the University of Adelaide and now working with Geoscience Australia.
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29 broadband MT stations were collected by the University of Adelaide along the AEM traverse 7002001in May 2012. This abstract incorporates the Cariewerloo Basin AEM Survey (Geocat 71309) with a new data set of magnetotellurics. Processing was also conducted by the University of Adelaide, funded by DMITRE (SA Gov). This was a part of an honours thesis by Millicent Crowe at the University of Adelaide. MT EDI files can be found at DMITRE.