b'Geophysics in the SurveysNewsthat define the architecture of theas define the geometry of the overlyingGDA94 zones 54, 55 and 56. This allows orogens in NSW. Constraining datasetsbasins. The study resulted in the statewidethe most appropriate depth to basement include surface mapping, geologicaldepth to basement 3D surface model. surface to be imported into any project, cross-sections, well data, digitalThe first-pass version of the 2016depending on its location and the elevation models, seismic, gravity andmodel was constrained by interpretedcoordinate system used. The refined magnetic data, and 2D forward modelslithology from approximately 150,000model aims to improve the confidence of (Spampinato 2018). water bores, combined with pre-existingexploration companies when estimating The statewide 3D fault model wasseismic picks, basement contours andthe depth to prospective basement rocks constructed using data compiled as partmagnetic-source depth models. Thewithin their project areas.of the GSNSW Seamless Geology Datasetinformation was validated by collatingContact: giovanni.spampinato@planning.(Colquhoun et al. 2018), which providesand interpreting lithological logs fromnsw.gov.au (02) 4063 6655.a compilation of the best available NSWapproximately 25,000 mineral, petroleum mapping data in an internally consistentand coal drillholes (Robinson 2017). The format. The 3D fault model aims to match2016 depth to basement and basementMinView updatesthe seamless geodatabase as closely asoutcrop models were also constrainedNew functionality has been incorporated possible, within software processing andusing the line work from the Seamlessinto the GSNSW data discovery and interpretation limitations. Geology Dataset (Colquhoun et al. 2018)viewing tool, MinView, which will and the Surface Geology of New Southimprove versatility and enhance the user The statewide 3D fault model wasWales 1:1,500,000 map. experience:released as four separate 3D models: As with any model, the resulting surfaces Curnamona Province and Delamerianwere highly dependent on the scale,the default base map satellite imagery Orogen model quality and density of the constrainingservice now has access to more recent Western Lachlan Orogen and southerndata, and the model developmentimagery across most locations in Thomson Orogen model procedure. Newly acquired datasets, re- NSW. The NSW Spatial Services aerial Eastern Lachlan Orogen model evaluation of geological and geophysicalimagery service is still available for New England Orogen model. data, and new 3D modelling have ledcomparison.to a better understanding of basinnew 3D-mode improvements provide The 3D fault models are available asgeometries and rock distribution acrossthe ability to alter vertical exaggeration Geoscience ANALYST projects, GOCADthe southern Thomson Orogen and theand adjust shadows. A quick help guide and DXF compressed files. The modelsSydney, Gunnedah and Bowen basinspopup explaining navigation in 3D has include fault and topographic surfaces(Oliveira and Davidson 2018). Thesealso been included.and incorporate fault attributionrefinements have been incorporatedusers exported CSV selections can now consistent with the seamless geologyinto an updated statewide depth tobe reimported using the Add local geodatabase. All fault surfaces in thebasement 3D model (Spampinato 2019). spatial data tool.models are attributed with dip direction,The updated statewide depth toIn addition, several key datasets have dip angle, fault depth, fault kinematics,basement 3D model (Figure 3) isbeen added or improved:fault order and fault name. released as SKUA-GOCAD objects The statewide 3D fault model willand CAD data file format (.dxf) and isa new geophysics download view provide a regional-scale geologicalavailable in four different coordinateconveys the optimal publicly available framework for future detailed modelling.projections; GDA94 NSW Lambert, andgeophysics data in the state (Figure4). Updates will be ongoing, with the addition of lithological and structural infill of the model as new constraining geological and geophysical data become available. The model will advance the understanding of the crust, tectonic setting and Phanerozoic geodynamic evolution of eastern Australia, and aid greenfields mineral exploration.Contact: giovanni.spampinato@planning.nsw.gov.au (02) 4063 6655.Statewide depth to basement 3D model updateThe statewide post-Carboniferous cover thickness 3D model released in 2016 (Robinson 2017) aimed to constrain the thickness of consolidated andFigure 3.Perspective view of the 2019 updated statewide depth to basement 3D model showing the top unconsolidated cover that overlies theof basement surface with a 10X vertical exaggeration. Colour scale bar indicates depth. Black voids indicate crystalline basement across NSW, as wellareas of outcropping basement.AUGUST 2019 PREVIEW 18'