首页|Ambient noise tomography of an iron-oxide copper-gold (IOCG) deposit under thick cover

Ambient noise tomography of an iron-oxide copper-gold (IOCG) deposit under thick cover

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  • Taylor & Francis
As most outcropping and shallow mineral deposits have been found, new technology is imperativeto finding the hidden critical mineral deposits required for the renewable energy transition.One such seismic technique, called ambient noise tomography (ANT), has shown promise inrecent years as a low cost and low environmental impact passive method of three-dimensional(3D) imaging of shear-wave velocity structure of the Earth. Over the last twenty years the methodhas been well-established in academia to image crustal and regional scale geological featuresbut has seldom been used at the mineral exploration deposit-scale. In this paper we show theapplication of seismic ANT at an IOCG deposit in South Australia under more than 750mof sedimentarycover. A 100-site survey in a 10 by 10 grid with site spacing of 1 km, using 3-componentnodal seismometers with a natural-frequency of 5 Hz, was conducted over a two-week period.Data were inverted to generate a 3D velocity model to a depth of 2 km. When compared to drillholesin the survey area, the tomographic model delineates cover sequence lithologies and thedepth of crystalline basement. A velocity anomaly in the basement has characteristics of a potentialIOCG deposit and is aligned with a gravity anomaly due to brecciated haematite. The results ofthe paper indicate that ANT is a useful tool for deep cover mineral exploration that can potentiallyexpedite the discovery of new deposits.

Ambient noise tomographyANTseismic velocitymineral explorationIOCG

Gerrit Olivier、Graham Heinson、Ben Kay、Goran Boren、Ying Liu、Simon Carter、Tim Jones、Philippe Dales、Rebecca Abel、Lisa Vella、Louise McAllister

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Centre for Ore Deposits and Earth Sciences, University of Tasmania, Tasmania, Australia||Fleet Space Technologies, Beverley, Australia

School of Physics, Chemistry and Earth Sciences, University of Adelaide, Adelaide, Australia

School of Physics, Chemistry and Earth Sciences, University of Adelaide, Adelaide, Australia||School of Geophysics and Geomatics, ChinaUniversity of Geosciences,Wuhan, People’s Republic of China

School of Physics, Chemistry and Earth Sciences, University of Adelaide, Adelaide, Australia||eWuhan University of Science and Technology,Wuhan, People’s Republic ofChina

Fleet Space Technologies, Beverley, Australia

Department of Earth, Ocean and Atmospheric Sciences, University of British Columbia, Vancouver, Canada||Philippe DalesSoftware Consulting Ltd, Vancouver, Canada

Fortescue Metals Group, Perth, Australia

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2024

10.1080/08123985.2024.2371001

Exploration geophysics

Exploration geophysics

EISCI
ISSN：0812-3985
年,卷(期)：2024.55(6)
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