Please use this identifier to cite or link to this item: http://hdl.handle.net/2440/92159
Type: Thesis
Title: Magnetotellurics and Airborne Electromagnetics as a combined method for assessing basin structure and geometry
Author: Crowe, M.
Issue Date: 2012
School/Discipline: School of Earth and Environmental Sciences
Abstract: Unconformity-type uranium deposits are characterised by 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. The MT data was collected at 29 stations and successfully imaged the depth to basement, furthermore providing evidence for deeper fluid pathways. The AEM data were integrated into the regularisation mesh as a-priori information generating an AEM constrained resistivty model and also correcting for static shift. The AEM constrained resistivity model best resolved resistive structures, allowing strong contrast with conductive zones. There was not enough resolution in the MT models to establish the presence of uranium mineralisation.
Dissertation Note: Thesis (B.Sc.(Hons)) -- University of Adelaide, School of Earth and Environmental Sciences, 2012
Where: Cariewerloo Basin, South Australia
Keywords: Honours; Geology; Magnetotellurics; electromagnetic induction; airborne electromagnetics; static shift; Cariewerloo Basin; Pandurra Formation; uranium, exploration; unconformity
Description: This item is only available electronically.
Provenance: This electronic version is made publicly available by the University of Adelaide in accordance with its open access policy for student theses. Copyright in this thesis remains with the author. This thesis may incorporate third party material which has been used by the author pursuant to Fair Dealing exceptions. If you are the author of this thesis and do not wish it to be made publicly available, or you are the owner of any included third party copyright material you wish to be removed from this electronic version, please complete the take down form located at: http://www.adelaide.edu.au/legals
Appears in Collections:School of Physical Sciences

Files in This Item:
File Description SizeFormat 
01frontGeoHon.pdfTitle page, abstract & contents169.54 kBAdobe PDFView/Open
02wholeGeoHon.pdfWhole thesis (as available)4.03 MBAdobe PDFView/Open


Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.