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Report 135: a Magnetotelluric Traverse Across the Eastern Part of The Department of Mines and Petroleum Government of Western Australia REPORT A MAGNETOTELLURIC TRAVERSE 135 ACROSS THE EASTERN PART OF THE CAPRICORN OROGEN by MC Dentith, SP Johnson, S Evans, ARA Aitken, A Joly, S Thiel, and IM Tyler Geological Survey of Western Australia Government of Western Australia Department of Mines and Petroleum REPORT 135 A MAGNETOTELLURIC TRAVERSE ACROSS THE EASTERN PART OF THE CAPRICORN OROGEN by MC Dentith1, SP Johnson, S Evans2, ARA Aitken1, A Joly1, S Thiel 3, and IM Tyler 1 Centre for Exploration Targeting, The University of Western Australia, 35 Stirling Hwy, Crawley WA 6009 2 Moombarriga Geoscience, Box 1184, West Perth WA 6872 3 TRaX, Mawson Building, North Terrace Campus, The University of Adelaide, Adelaide SA 5005 Perth 2014 Geological Survey of Western Australia MINISTER FOR MINES AND PETROLEUM Hon. Bill Marmion MLA DIRECTOR GENERAL, DEPARTMENT OF MINES AND PETROLEUM Richard Sellers EXECUTIVE DIRECTOR, GEOLOGICAL SURVEY OF WESTERN AUSTRALIA Rick Rogerson REFERENCE The recommended reference for this publication is: Dentith, MC, Johnson, SP, Evans, S, Aitken, ARA, Joly, A, Thiel, S and Tyler, IM 2014, A magnetotelluric traverse across the eastern part of the Capricorn Orogen: Geological Survey of Western Australia, Report 135, 49p. National Library of Australia Cataloguing-in-Publication entry: Author: Dentith, Mike, author. Title: A magnetotelluric traverse across the eastern part of the Capricorn Orogen / MC Dentith, SP Johnson, S Evans, A Aitken, A Joly, S Thiel, and IM Tyler. ISBN: 9781741685558 (ebook) Subjects: Magnetotelluric prospecting--Western Australia--Gascoyne Region. Orogeny--Western Australia--Gascoyne Region. Geological surveys--Western Australia--Gascoyne Other Authors/Contributors: Johnson, S. P., author. Evans, S., author. Aitken, Alan, author. Joly, A, author. Thiel, Stephan, author. Tyler, I. M., author. Dewey Decimal Classification: 622.15309941 ISSN 1834–2280 Grid references in this publication refer to the Geocentric Datum of Australia 1994 (GDA94). Locations mentioned in the text are referenced using Map Grid Australia (MGA) coordinates, Zones 50 and 51. All locations are quoted to at least the nearest 100 m. Copy editor: K Hawkins Cartography: M Prause, AK Symonds Desktop publishing: RL Hitchings Printed by Images on Paper, Perth, Western Australia Disclaimer This product was produced using information from various sources. The Department of Mines and Petroleum (DMP) and the State cannot guarantee the accuracy, currency or completeness of the information. DMP and the State accept no responsibility and disclaim all liability for any loss, damage or costs incurred as a result of any use of or reliance whether wholly or in part upon the information provided in this publication or incorporated into it by reference. Published 2014 by Geological Survey of Western Australia This Report is published in digital format (PDF) and is available online at <www.dmp.wa.gov.au/GSWApublications>. Further details of geological publications and maps produced by the Geological Survey of Western Australia are available from: Information Centre Department of Mines and Petroleum | 100 Plain Street | EAST PERTH | WESTERN AUSTRALIA 6004 Telephone: +61 8 9222 3459 Facsimile: +61 8 9222 3444 www.dmp.wa.gov.au/GSWApublications Cover photograph: Auger drilling for deployment of the z-component electrode during acquisition of the eastern Capricorn Orogen magnetotelluric traverses Contents Abstract ..................................................................................................................................................................1 Introduction ............................................................................................................................................................1 Magnetotelluric method ..................................................................................................................................3 Regional geology....................................................................................................................................................3 Archean cratons ...............................................................................................................................................3 Yilgarn Craton ..........................................................................................................................................3 Marymia Inlier ..................................................................................................................................7 Pilbara Craton and associated basins .......................................................................................................7 Sylvania Inlier ...................................................................................................................................7 Gascoyne Province and Glenburgh Terrane .............................................................................................8 Proterozoic sedimentary basins .......................................................................................................................9 Yerrida Basin ............................................................................................................................................9 Bryah Basin ..............................................................................................................................................9 Padbury Basin ........................................................................................................................................11 Earaheedy Basin .....................................................................................................................................11 Edmund and Collier Basins....................................................................................................................12 Tectonic evolution of the eastern Capricorn Orogen.....................................................................................13 Previous geophysical studies ................................................................................................................................14 Passive seismic and gravity constraints .........................................................................................................14 Previous magnetotelluric surveys ..................................................................................................................15 Implications of previous geophysical studies ...............................................................................................17 Magnetotelluric survey .........................................................................................................................................17 Data acquisition .............................................................................................................................................17 Data processing .............................................................................................................................................19 Frequency–domain MT responses .........................................................................................................19 Static corrections ....................................................................................................................................20 Dimensionality and geoelectric strike ....................................................................................................21 Data modelling ..............................................................................................................................................25 3D modelling..........................................................................................................................................30 Conductivity variations from 3D modelling ........................................................................................................30 Traverse 1 ......................................................................................................................................................30 Traverse 2 ......................................................................................................................................................30 Feature testing ...............................................................................................................................................32 Discussion ............................................................................................................................................................33 Confidence in the 3D MT model ...................................................................................................................33 Crustal architecture .......................................................................................................................................34 Correlation of crustal architecture across the orogen.............................................................................36 Geotectonic history ................................................................................................................................37 Conclusions ..........................................................................................................................................................37 Acknowledgements ..............................................................................................................................................38
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