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EAST YILGARN GEOSCIENCE DATABASE, 1:100 000 GEOLOGY of the LEONORA– LAVERTON REGION, EASTERN GOLDFIELDS GRANITE–GREENSTONE TERRANE — an EXPLANATORY NOTE by M

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EAST YILGARN GEOSCIENCE DATABASE, 1:100 000 GEOLOGY of the LEONORA– LAVERTON REGION, EASTERN GOLDFIELDS GRANITE–GREENSTONE TERRANE — an EXPLANATORY NOTE by M REPORT EAST YILGARN GEOSCIENCE DATABASE 84 1:100 000 GEOLOGY OF THE LEONORA–LAVERTON REGION EASTERN GOLDFIELDS GRANITE–GREENSTONE TERRANE — AN EXPLANATORY NOTE by M. G. M. Painter, P. B. Groenewald, and M. McCabe GEOLOGICAL SURVEY OF WESTERN AUSTRALIA REPORT 84 EAST YILGARN GEOSCIENCE DATABASE, 1:100 000 GEOLOGY OF THE LEONORA– LAVERTON REGION, EASTERN GOLDFIELDS GRANITE–GREENSTONE TERRANE — AN EXPLANATORY NOTE by M. G. M. Painter, P. B. Groenewald, and M. McCabe Perth 2003 MINISTER FOR STATE DEVELOPMENT Hon. Clive Brown MLA DIRECTOR GENERAL, DEPARTMENT OF INDUSTRY AND RESOURCES Jim Limerick DIRECTOR, GEOLOGICAL SURVEY OF WESTERN AUSTRALIA Tim Griffin REFERENCE The recommended reference for this publication is: PAINTER, M. G. M., GROENEWALD, P. B., and McCABE, M., 2003, East Yilgarn Geoscience Database, 1:100 000 geology of the Leonora–Laverton region, Eastern Goldfields Granite–Greenstone Terrane — an explanatory note: Western Australia Geological Survey, Report 84, 45p. National Library of Australia Cataloguing-in-publication entry Painter, M. G. M. East Yilgarn Geoscience Database, 1:100 000 geology of the Leonora–Laverton region, Eastern Goldfields Granite–Greenstone Terrane — an explanatory note Bibliography. ISBN 0 7307 5739 0 1. Geology — Western Australia — Eastern Goldfields — Databases. 2. Geological mapping — Western Australia — Eastern Goldfields — Databases. I. Groenewald, P. B. II. McCabe, M., 1965–. III. Geological Survey of Western Australia. IV. Title. (Series: Report (Geological Survey of Western Australia); 84). 559.416 ISSN 0508–4741 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, Zone 51. All locations are quoted to at least the nearest 100 m. Copy editor: D. P. Reddy Cartography: L. S. Cosgrove Desktop publishing: K. S. Noonan Printed by Haymarket Printing, Perth, Western Australia Published 2003 by Geological Survey of Western Australia Copies available from: Information Centre Department of Industry and Resources 100 Plain Street EAST PERTH, WESTERN AUSTRALIA 6004 Telephone: (08) 9222 3459 Facsimile: (08) 9222 3444 This and other publications of the Geological Survey of Western Australia are available online through the Department’s bookshop at www.doir.wa.gov.au Cover photograph: The historic mine site at Mount Windarra (MGA 425200E 6848550N) in the Margaret Anticline northwest of Laverton, where sulfide mineralization associated with komatiitic lavas made this the second-largest Australian source of nickel from 1974 to 1979. Contents Introduction ............................................................................................................................................................... 1 Abstract ...................................................................................................................................................................... 1 Location, access, and physiography .................................................................................................................. 3 The database .............................................................................................................................................................. 5 Themes ............................................................................................................................................................... 5 Geology ....................................................................................................................................................... 5 Regional interpreted bedrock geology ....................................................................................................... 9 Airborne magnetic survey .......................................................................................................................... 9 Magnetic interpretation .............................................................................................................................. 9 Landsat TM ................................................................................................................................................. 9 Localities of mine workings, prospects, and subsurface observations ..................................................... 9 MINEDEX — mineral resources ............................................................................................................... 9 TENGRAPH — a record of the extent, location, and status of tenements .............................................. 9 Geological setting of the Leonora–Laverton region .............................................................................................. 10 Boundary between the Eastern Goldfields and Southern Cross Granite–Greenstone Terranes ................... 10 Subdivision of the southern part of the Eastern Goldfields Granite–Greenstone Terrane ............................ 10 Greenstone belts ............................................................................................................................................... 10 Illaara greenstone belt, Southern Cross Granite–Greenstone Terrane .................................................... 12 Mount Ida greenstone belt ........................................................................................................................ 12 Agnew–Wiluna greenstone belt ............................................................................................................... 13 Yandal greenstone belt ............................................................................................................................. 13 Malcolm greenstone belt .......................................................................................................................... 14 Pig Well – Yilgangi belt ........................................................................................................................... 14 Murrin greenstone belt ............................................................................................................................. 14 Laverton greenstone belt .......................................................................................................................... 15 Duketon greenstone belt ........................................................................................................................... 16 Cosmo Newbery greenstone belt ............................................................................................................. 16 Archaean geology ................................................................................................................................................... 16 Rock types ........................................................................................................................................................ 16 Ultramafic rocks ....................................................................................................................................... 16 Mafic volcanic rocks ................................................................................................................................ 18 Felsic extrusive rocks ............................................................................................................................... 19 Clastic sedimentary rocks ......................................................................................................................... 19 Chemical sedimentary rocks .................................................................................................................... 20 Mafic intrusive rocks ................................................................................................................................ 20 Granitoid rock types ................................................................................................................................. 20 Dykes and veins ........................................................................................................................................ 22 Metamorphic rocks ................................................................................................................................... 22 Gneissic rocks ........................................................................................................................................... 22 Deformation ..................................................................................................................................................... 22 Early deformation events .......................................................................................................................... 22 D2 event ..................................................................................................................................................... 22 D3 event ..................................................................................................................................................... 23 D4 and D5 events ....................................................................................................................................... 24 Metamorphism ................................................................................................................................................. 24 Proterozoic geology ...............................................................................................................................................
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