b'AEGC 2023Short abstractsQuantitative, multi-scale characterisation of modernhyperspectral drill core scanner, HyLogger3, which is part of depositional analogues of dryland deltas in response toAuScopes National Virtual Core Library research infrastructure increasing tidal range (Gascoyne, Ashburton & De Greyprogrammes. The HyLogger3 data are publicly available through river deltas, Western Australia). the AuScope portal (http://portal.auscope.org.au/) and GSWAs GeoView portal (GeoVIEW.WA). Furthermore, the thermal Simon Lang1 Victorien Paumard1, Mick OLeary1, Ulysse Lebrec1,infrared hyperspectral data collected by HyLogger3 allow Andy Jian1, John Shepherd1, Andrew Winch1, Pomeroy Smith1,cost-effective mapping of Li-host minerals, such as spodumene, John Holbrook2 and Henry Henk2 petalite, holmquistite and amblygonite. Spodumene represents the main Li-host at Greenbushes, whereas considerable 1 University of Western Australiaamounts of petalite can be found at King Col in addition to 2 Texas Christian University, Dallas, Texas spodumene. Holmquistite and amblygonite are minor Li-host Subsurface modelling of dryland fluvial-deltaic systems requiresminerals. A range of spectral signatures of spodumene and that a range of uncertainty is considered when determiningpetalite can be observed in both mineral deposits and are the 2D and 3D geometry and spatial juxtaposition of facies.potentially due to variations of chemical composition of the In dryland systems, the rivers typically flow only followingLi-host minerals, including Fe:Al and Li:Na ratios. Feldspars are seasonal rainfall events (a few weeks of the year either followingcommon gangue minerals in both deposits and show different cyclones or winter storms). This study investigates the impact ofNa:Ca ratios down hole, indicating zoning of the ore body. increasing tidal range and storm-generated flooding associatedThe HyLogger3 data were used to identify 101 samples from with seasonal river flashy flows and wave erosion events onGreenbushes drill core C3DD024 for FTIR and geochemical the facies distribution of three deltas along the remote aridanalysis, which allowed calibration of the HyLogger3 data and to semi-arid coast of Western Australia (Gascoyne, Ashburton,Partial Least Squares-modelling based prediction of Li, Na and and De Grey River deltas). Facies distribution and quantitativeother key geochemical elements across the five drill cores. Our geometric measures from element to complex scale arecase study demonstrates the potential for advanced but cost-presented for the three systems, outlining the potentialeffective Li-resource characterisation by means of reflectance application as useful analogues for subsurface modelling ofspectroscopy, helping to assess the economic value of different comparable ancient systems as the tidal influence increases.ore bodies quickly.Quantitative data to characterise the deposits of these depositional systems are presented, including results from3D bedrock model utilising multi-channel analysis of time-series satellite image analysis, airborne LIDAR, drone basedsurface waves to assist the land development industry hi-resolution photogrammetry, automated satellite-derivedin Greater Melbourne, VIC.bathymetry, shallow auger holes, river sediment sampling, laser-particle grain-size analysis and age dating. As the deltasTavis Lavellgrow, distributary channels undergo avulsion to build new sub-areal splays and flood deposits, interacting with tidalA common problem across greater Melbournes expanding land flats on the lower delta plain, and growing new mouth-barsdevelopment, both residential and commercial, is encountering at the delta front that become extensively reworked by tidessites that have incredibly stiff and undulating bedrock. This is and minor waves to build asymmetric deltas, increasing sandexperienced on sites with Newer Volcanic Basalt which accounts connectivity. Tidal reworked fine-medium sands are pumped upfor two thirds of greater Melbourne, the weathered profile of the distributary channels, especially in the dry seasons. Laterally,these once lava flows produces a highly variable depth and storm-wave generated beach ridges accrete up-drift from thestrength bedrock interface. The acquisition of bedrock survey mouth-bars and become moulded into aeolian dunes alongdata has been shown to reduce site uncertainty, unforeseen their crests. High evaporation rates lead to high salinity in theearthwork costs and financial risk. Working hand in hand with lower delta plain lagoons and distributary channels, and at thetraditional intrusive geotechnical methods, the Multi-channel De Grey, calcareous, clay-rich ooids form within a vast delta- Analysis of Surface Waves (MASW) method can connect the dots front tidal shoal attached to between boreholes generating 2D geological cross-sections of the subsurface. These 2D cross-sections when combined can the mouth-bar complex, reworked into distributary channelscreate a 3D subsurface model of the bedrock. This data can be and beach ridges (2000 yrs BP). presented in a variety of ways, including contour plots in either elevation or depth below ground level (BGL), overlying clay Whole rock geochemistry and hyperspectralvolumetric calculations to user friendly 3D AutoCAD files which mineralogy of Western Australian LCT pegmatites. can be encompassed with a topography model. Producing a very comprehensive site classification package, a useful tool for Carsten Laukamp and Monica LeGras the investigatory stage for any land development project.CSIROHardrock 3D seismic imaging of the Mawson ProspectCSIRO Mineral Resources evaluates geochemical and optical sensing technologies for cost-effective exploration and oreJie Jian Leong and Barry Bournebody characterisation of a wide range of critical metals deposits,Terra Resourcessuch as pegmatite-hosted Li-deposits. This paper presents varieties of ore and gangue mineral assemblages of five drillThe Mawson prospect is home to a semi-massive nickel-copper cores from the Greenbushes and King Col LCT pegmatites,sulphide discovery that sits within the Fraser Range District of located in the Yilgarn and Pilbara Cratons of Western Australia,the Albany-Fraser Orogen in Western Australia that also contains respectively. The mineralogical drill core data were collectedthe Nova Bollinger and Silver Knight Deposits. Since its initial by the Geological Survey of Western Australia (GSWA) using adiscovery, the exploration programmes has been expanded FEBRUARY 2023 PREVIEW 114'