b'AEGC 2023Short abstractscontaminated soil. The resistivity of ASC topsoil : 54.37 ohm-m,are proposed to extend southward beneath the Newer Volcanic ASC stabilised soil : 34.77 ohm-m, ASC subsoil : 147.83 ohm-m and theProvinces basaltic rocks and sedimentary succession of the Otway low resistivity in the stabilised soil. The chargeability was lowand Bass basins. There is considerable uncertainty regarding the in the subsoils with ASC topsoil : 1.79 mV/V, ASC stabilisedsoil : 1.97exact location once they become buried by younger sedimentary mV/V and ASC subsoil : 0.62 mV/V. The resistivity of GB topsoil : 32.11and volcanic successions because they have been difficult to ohm-m, GB stabilised soil : 67.92 ohm-m, GB subsoil : 121.20 ohm-m andimage in potential field and seismic reflection data. We propose the resistivity increased toward the bottom. The chargeabilitya novel approach that effectively locates and determines the was high in the stabilised soils with GB topsoil : 3.19 mV/V,architecture of deep-crustal faults by using unsupervised GB stabilisedsoil : 5.43 mV/V and GB subsoil : 1.33 mV/V. The laboratorymachine learning to interpret Euler deconvolution depth results experiments and the two-dimensional imaging of the field haveof magnetic data. While this is an invaluable tool in areas of good agreement with each measuring result. The dominantlimited high-resolution geophysical datasets, it provides new fraction of As and Pb was the residual fraction. The carcinogenicinsights into the location and extension of the Delamerian/risk values for As were within the ranges of 6.3810-4 forLachlan basement faults across Southeast Australias passive Asangcheon (ASC), 4.5110-5 for Namsun (NS) andmargin using the Global Earth Magnetic Anomaly Grid (EMAG). 3.1410-4 for Gunbuk (GB), respectively. The hazard quotientThe new method identifies the strike and dip of faults using for non-carcinogenic risk was highest for As to children in ASCEuler deconvolution depth cluster boundaries obtained from the (1.417), NS (0.100) and GB (0.698), which covered approximatelyDensity-Based Clustering with Noise (DBSCAN) algorithm. We 94.7, 75.2 and 78.9% of the hazardous indices, respectively. demonstrate that the results are comparable to seismic reflection interpretation and gravity models. Our findings indicate that the Exploring for minerals under Murray Basin cover withProterozoic micro-continent VanDieland, entrained into the east airborne gravity gradiometry. Gondwana accretionary orogen in the Late Devonian, is marked by relatively high depth clusters. In Victoria, VanDielands edge Asbjorn Christensen1 Luke Titus 2 and David Moore is located across a distinct step in cluster depth transition that aligns with the west-dipping Mount William and the NW-dipping 1 Nordic GeoscienceBambra Faults in the west and to the east, the Governor Fault. 2 North Central GoldOur findings confirm that the Bambra Fault truncates the west-In 2021-2022 North Central Gold acquired more than 18, line-kmdipping Avoca Fault. Depth clusters suggest the west-dipping airborne gravity gradiometry (AGG), scalar vertical gravity, andYarramyljup Fault extends beyond the Victorian coast, severing total magnetic field intensity (TMI) data over tenements in thethe Grampian Stavely Zone north-west of King Island. This work Stawell Corridor north of Horsham in north-western Victoria. Theredefines the basement map of Southeast Australia and provides purpose of the survey was to improve the understanding of theinsight into the relative roles of the basement faults in basin geology and the prospectivity of the bedrock beneath the cover. development.The observed gravity gradiometer data has revealed deep-seated Devonian (?) density anomalies in the Cambro- A seismic source field trial in the Bass Strait: testing the Ordovician bedrock beneath 40 m-200 m thick Cenozoic Murrayimpact of several different source configurations on Basin cover, providing Stawell Magdala basalt dome-typegeophysical quality, received sound and direct impact gold exploration targets. 2D interpretation and 3D inversionon scallops and lobsters.of the observed AGG and TMI data have provided structural information and fault information about the underlyingJon Cockerbedrock. Joint analysis of the derived density and magnetic susceptibility models has provided a pseudo-lithologicalBeach Energyclassification of the bedrock units. The survey data have alsoBeach Energy acquired a comprehensive 2D marine seismic highlighted the presence of shallow Cenozoic strandlinessource field trial in Dec 2021 in the Bass Strait in shallow water which provide additional mineral sand exploration targets. The(50-80 m) in conjunction with the Institute for Marine and extensive coverage and the uniform quality of the airborneAntarctic Studies (IMAS), Fisheries Research and Development geophysical data has allowed North Central Gold to rapidlyCorporation (FDRC), Curtin University, and Department of identify and focus on specific tenement areas for retention andPrimary Industries, Parks, Water and Environment (DPIPWE). further exploration. The tests included a full-size source array (2480 cu.in.) used in a wide-tow triple source configuration, a single 2098 cu. A new approach to imaging deep crustal structuresin. eSource TM array, and various incarnations of Distributed across passive continental margins: Revisiting the crustalSource with source sizes as small as 140 cu.in with timing architecture of Southeast Australias passive margin. between shots as low as 500 ms.Chibuzo Chukwu 1,2 Peter Betts1, Robin Armit1, RadhakrishnaThe unique field trial is a combined study that measures the Munukutla2, David Moore1, Mark Mclean3,4 and Dave Briguglio5 impact of conventional and new seismic source technology/techniques on:1 Monash University,2 Indian Institute of Technology Bombay 1. Geophysical data quality3 Geological Survey of Victoria2. Impacts on scallop and lobster specimens placed on the 4 The University of Melbourneseafloor at varying distances5 Datarock Pty Ltd, Melbourne VIC 3000, Australia 3. Received sound levelsPhanerozoic-Precambrian basement faults in Victoria, SE thatThe scallop and lobster specimens are being assessed over a defined major structural domains of the western Lachlan Orogenperiod of 6 months for gross physical damage and survival, pH, FEBRUARY 2023 PREVIEW 88'