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An Appraisal of Airborne Geophysical Data from the Murrindal Survey, Victoria

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An Appraisal of Airborne Geophysical Data from the Murrindal Survey, Victoria VIMP Report 34 An appraisal of airborne geophysical data from the Murrindal survey, Victoria R.J. Twyford October 1996 Bibliographic reference: TWYFORD, R.J., 1996. An appraisal of airborne geophysical data from the Murrindal survey, Victoria. Victorian Initiative for Minerals and Petroleum Report 34. Department of Natural Resources and Environment. © Crown (State of Victoria) Copyright 1996 Geological Survey of Victoria ISSN 1323 4536 ISBN 0 7306 9404 6 Keywords: Geophysics, magnetics, radiometrics, digital terrain model, Murrindal, Bairnsdale, Yalmy Fault Zone, Reedy Creek area, Limestone Creek Graben, Silurian granites, Snowy River Volcanics, Buchan Group, Tertiary volcanics, mineral potential. This report may be purchased from: Business Centre Department of Natural Resources and Environment Ground Floor, 115 Victoria Parade Fitzroy, Victoria 3065 For further technical information contact: Manager Geological Survey of Victoria Department of Natural Resources and Environment P O Box 2145 MDC Fitzroy, Victoria 3065 AIRBORNE SURVEY APPRAISAL - MURRINDAL 1 Contents Abstract 2 1 Introduction 3 2 Previous geophysics 6 3 Survey details 7 4 Data preparation 8 4.1 Data processing 8 4.2 Products 8 5 Geological appraisal 9 5.1 Structure 9 5.2 Ordovician 15 5.3 Yalmy Fault Zone 15 5.4 Reedy Creek area 16 5.5 Limestone Creek Graben 16 5.6 Silurian intrusions 16 5.7 Devonian 18 Snowy River Volcanics 18 Buchan Group 19 5.8 Dykes 19 5.9 Tertiary Volcanics 20 5.10 Mineral potential 20 6 Conclusions 21 7 Glossary 22 8 References 23 Appendix 1 24 Status of VIMP airborne surveys Appendix 2 25 Survey specifications and data processing Appendix 3 27 Products Victorian Initiative for Minerals and Petroleum report series 28 List of Figures 1 Location of VIMP airborne surveys 4 2 Location of the Murrindal airborne survey 5 3 Total magnetic intensity (HSI) image (back pocket) 4 Total count pseudocolour image (back pocket) 5 Potassium pseudocolour image (back pocket) 6 Thorium pseudocolour image (back pocket) 7 Uranium pseudocolour image (back pocket) 8 Radiometric RGB image (back pocket) 9 Digital terrain model image (back pocket) 10 Simplified geology map (back pocket) 11 Location of several mineral prospects and mines (back pocket) List of Tables 1 Airborne surveys conducted over the Murrindal region 6 2 Specifications of the Murrindal airborne geophysical survey 7 4 Summary of geophysical responses of lithological units 10 5 Status of VIMP airborne surveys 24 2 AIRBORNE SURVEY APPRAISAL - MURRINDAL Abstract This report provides a first look appraisal of new, detailed, airborne magnetic and radiometric data obtained over the Murrindal 1:100 000 mapsheet area. A brief discussion of the geological features highlighted by the new data is presented. The geophysical data generally agrees well with the recently mapped geology. The magnetic data highlights moderately magnetic dykes, and subsurface extensions of magnetic granite bodies. Regional faults are clearly delineated in the magnetic data. Some mapped faults can be extended, and new faults are recognised. The radiometric data defines the outcrop extent of different lithologies, and highlights compositional variations within the Silurian granite bodies. In particular, a new phase of the Nunniong Pluton has been recognised, based on its distinctive response. The Buchan Group sediments also have a distinctive radiometric response which can be used to map their extent. The lava flows of the Older Volcanics have a strong, reversely magnetised signature, and a distinctive radiometric response. The recognition of large subsurface extensions of the I-type, magnetic granites within the survey area may provide new areas for porphyry copper exploration. Dyke swarms within the Nunniong Pluton may indicate extensions of mineralisation in this area. AIRBORNE SURVEY APPRAISAL - MURRINDAL 3 1 Introduction The data described within this report were obtained as part of the Victorian Initiative for Minerals and Petroleum (VIMP). They comprise detailed, helicopter mounted airborne magnetic and radiometric data, acquired by GeoInstruments in 1995/6, using 200 m line spacing. The Murrindal 1:100 000 mapsheet (MURRINDAL) covers an area of 2460 km2, most of which is rugged mountainous terrain. Detailed geological mapping was undertaken in 1984 to 1989, prior to the acquisition of the detailed geophysical data (Orth et al., 1995). The MURRINDAL survey completes the coverage of the Eastern Highlands with quality detailed airborne magnetic and radiometric data. Data compilation and mineral resource assessment are also being undertaken as part of the VIMP Eastern Highlands Initiative. These new data compliment the presently mapped geology, refining geological boundaries, and fault positions. The geophysical data will aid significantly in the geological understanding of the area, leading to a better understanding of the controls on mineralisation. Images of the total magnetic intensity, total count, potassium, thorium, uranium, RGB radiometrics and digital terrain model are presented in Figures 3-9. A simplified geology map is presented as Figure 10. Figure 11 comprises a magnetic image with the location of several mineral prospects overlain. 6 AIRBORNE SURVEY APPRAISAL - MURRINDAL 2 Previous geophysics A detailed airborne magnetic and radiometric survey was flown over the southern part of MURRINDAL by BHP in 1989, and a number of There have been several airborne geophysical small airborne surveys have been carried out by surveys conducted throughout the other mineral exploration companies MURRINDAL region in previous years. A throughout MURRINDAL. Although these summary list of the airborne magnetic, detailed surveys are of limited use for regional radiometric, and EM surveys is presented in assessment, they may be used to enhance the Table 1. detail of the new regional data. The previous regional magnetic survey for Gravity coverage over the survey area is poor. MURRINDAL was flown by the Bureau of The BMR carried out road traverses with 2 to 8 Mineral Resources (BMR) in 1975. The survey kilometre station spacing during 1952, 1961, covered the Bairnsdale 1:250 000 mapsheet 1978. A helicopter transported gravity survey with E-W flight lines 1.5 kilometres apart, at a was undertaken in 1973, at approximately 11 constant altitude of 1680 m. The current VIMP kilometre station spacing (Withers et al., 1991). survey specifications means the new data The accuracy of the helicopter data is poor. supersede the previous regional magnetic and Improved gravity data, with better coverage radiometric surveys. would aid geophysical interpretation. Table 1 Airborne surveys conducted over the Murrindal region GSV Survey Survey Operator Contractor Year Line Altitude Direction survey name type spacing (AGL) number (m) (m) 10 Eastern TMI BMR BMR 1956 1730 260 East-west Highlands 124 Bairnsdale TMI BMR BMR 1975 1500 1680 East-west 374 Buchan TMI/Rad BHP Austirex 1989 200 40/80 East-west 2665 Orbost TMI/Rad GSV Geo 1994 200 90 East-west/ Instruments North-south 3060 Murrindal TMI/Rad GSV Geo 1995/6 200 80 East-West Instruments AIRBORNE SURVEY APPRAISAL - MURRINDAL 7 3 Survey details A summary of the specifications for the MURRINDAL airborne survey is provided in Table 2, with more detail given in Appendix 2. The geophysical data were obtained by Geo Instruments Pty Ltd, using a Bell JetRanger helicopter. The flight lines were east-west at 200 m spacing, with tie lines north-south at 2000 m spacing. The magnetic data was acquired using a helium vapour magnetometer, towed with a mean terrain clearance of 80 m. The radiometric data were acquired using a 256 channel spectrometer, and have been calibrated using the Bairnsdale Hover range in Eastern Victoria. The radiometric data has been corrected to an equivalent height of 80 m above ground level. Table 2 Specifications of the Murrindal airborne survey Location Murrindal, North East Victoria (Figs 1 & 2) Date of survey November 1995 - January 1996 Kilometres flown 14700 km Acquisition Geo Instruments Pty Ltd Flight line direction east - west Flight line spacing 200 m Tie line direction north - south Tie line spacing 2000 m Aircraft Bell JetRanger helicopter VH-RLV Navigation Novatel 951R GPS receiver Magnetics Magnetometer Geometrics G833 split beam helium vapour Mean sensor height 80 m above ground level Time sample interval 0.1 seconds Ground sample interval approx. 4 m Radiometrics Gamma spectrometer Exploranium GR820, 16.8l, 256 channel, calibrated radiometrics Mean sensor height 100 m above ground level Time sample interval 1.0 second Sample interval approx. 40 m Processing Kevron Geophysics Pty Ltd Client Geological Survey of Victoria, Department of Natural Resources & Environment, Victoria 8 AIRBORNE SURVEY APPRAISAL - MURRINDAL 4 Data preparation 4.1 Data processing Processing of the data was undertaken by Kevron Geophysics Pty Ltd. Standard processing and corrections have been applied to the magnetic and radiometric datasets. The radiometric 256 channel data was processed using a spectral ratio method to remove the influence of radon. Further details of the processing methods are supplied in Appendix 2. 4.2 Products The results of the MURRINDAL geophysical survey are available in both hardcopy and digital format. A complete list of products is provided in Appendix 3. Digital products include grids for the magnetics, radiometrics and DTM, located data, and a GIS data package. Map sets are available at 1:100 000 and 1:25 000 scale. The 1:100 000 scale map set includes colour and greyscale
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