Magnetic petrophysics in the Stawell Gold Field: relating aeromagnetic anomalies to mineralising fluid flow

Robert J Musgrave; Funk Charles; Grewar Julia; Marta E. Vega

doi:10.1071/ASEG2006ab123

ISSN: 2202-0586
E-ISSN:

oa Magnetic petrophysics in the Stawell Gold Field: relating aeromagnetic anomalies to mineralising fluid flow
Authors Robert J Musgrave^a, Funk Charles^b, Grewar Julia^b and Marta E. Vega^c
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^a Geological Survey of NSW, 516 High Street, NSW, 2320, [email protected] ^b School of Earth SciencesThe University of Melboume, VIC, 3010 ^c PALM Laboratory School of Environmental Maitland, and Life SciencesThe University of Newcastle, Callaghan, NSW, 2308, [email protected]
Publisher: Australian Society of Exploration Geophysicists
Source: ASEG Extended Abstracts, Volume 2006, Issue ASEG2006 - 18th Geophysical Conference, Dec 2006, p. 1 - 4
DOI: https://doi.org/10.1071/ASEG2006ab123
- Published online: 01 Dec 2006

Abstract

Aeromagnetic anomalies at the Kewell Prospect in the Stawell gold field are characterised by negative lobes on the flanks of the Kewell structure, which require a source with reversed remanence. Direct measurement of remanence in Kewell samples was not possible, but hysteresis analysis of samples from Kewell and Stawell allow the pyrrhotite-bearing lithologies responsible for the magnetic anomalies to be divided into two populations. Population A spatially corresponds to zones of modelled high flow rates of mineralising fluids at Kewell, suggesting that the flow environment may directly influence magnetic properties, and through this influence, control the polarity of remanence. High fluid flow and associated gold endowment at Kewell appear to be associated with reversed remanence, and are signposted therefore by negative magnetic anomalies.

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References

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Squire, R.J. and Wilson, C.J.L., 2005, Interaction between collisional orogenesis and convergent-margin processes: eveolution of the Cambrian proto-Pacific margin of East Gondwana: Journal of the Geological Society of London, 162, 749-761.

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Article Type: Research Article

Keyword(s): hysteresis; Kewell prospect; magnetic petrophysics; modelling; remanence

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oa Magnetic petrophysics in the Stawell Gold Field: relating aeromagnetic anomalies to mineralising fluid flow

Abstract

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