This third edition preliminary three dimensional model has been constructed from themes compiled from a variety of sources and assembled primarily within ESRI and GoCAD applications. The display medium for web delivery has used the Virtual Reality Modelling Language (VRML) format. Geophysical modelling was done by Geoscience Australia geophysicists using data stored by GA. Interpreted geology images of the Tanami and Arunta were provided by the Nothern Territory Geological Survey. Cross-sections were geophysically modelled using ModelVision, with geological interpretation provided by the NTGS and imported into GoCAD to build three dimensional fault surfaces. This edition of the model incorporates magnetic and gravity inversion surfaces and a depth to magnetic source layer.

This second edition preliminary three dimensional model has been constructed from themes compiled from a variety of sources and assembled primarily within a GoCAD application. The display medium for web delivery has used the Virtual Reality Modelling Language (VRML) format. Layers of data were principally supplied by Geoscience Australia. Mineral occurrence information was provided by the Northern Territory and Western Australia Geological Surveys. Interpreted 1:250 000 scale maps of the Tanami and 1:500 000 Arunta North were provided by the Northern Territory Geological Survey. Cross-sections were geophysically modelled using ModelVision software and imported into GoCAD. Structural and geological modelling of cross-sections was provided by the NTGS. Surfaces were modelled in GoCAD using cross-section data and surface constraints. The current seismic proposal has been a collaborative effort involving Commonwealth, State and private companies.

Predictive 3D geological models of the subsurface can be developed using a range of available tools. Each tool is suited to slightly different problems and datasets. The method described here, using the UBC-GIF inversions algorithms, allows rapid development of models using an objective, automated procedure. It has flexibility to include as little or as much geological information as is available, making it ideal for greenfields exploration or mapping programs. The steps involved are: 1) develop a solid understanding of the expected physical properties; 2) convert geological observations into physical property constraints; 3) perform geologically-constrained inversions; 4) apply geological classifier to recovered 3D physical property models. The procedure is demonstrated for the southern Agnew-Wiluna greenstone belt in WA, a highly mineralised region with a high proportion of surface cover. The predictive 3D lithology models developed for the area are particular effective at mapping the extent of dense mafic and magnetic ultramafic rocks, and provide new insights about their distribution at depth.

Geoscience Australia has developed an interactive 3D viewer for three national datasets; the new Radiometric Map of Australia, the Magnetic Anomaly Map of Australia, and the Gravity Anomaly Map of the Australian Region. The interactive virtual globe is based on NASA's open source World Wind Java Software Development Kit (SDK) and provides users with easy and rich access to these three national datasets. Users can view eight different representations of the radiometric map and compare these with the magnetic and gravity anomaly maps and satellite imagery; all draped over a digital elevation model. The full dataset for the three map sets is approximately 55GB (in ER Mapper format), while the compressed full resolution images used in the virtual globe total only 1.6GB and only the data for the geographic region being viewed is downloaded to users computers. This paper addresses the processes for selecting the World Wind application over other solutions, how the data was prepared for online delivery, the development of the 3D Viewer using the Java SDK, issues involving connecting to online data sources, and discusses further development being undertaken by Geoscience Australia.

Examination of developing geothermal exploration techniques and a geothermal play systems framework in Australia.

High-CO2 gas fields serve as important analogues for understanding various processes related to CO2 injection and storage. The chemical signatures, both within the fluids and the solid phases, are especially useful for elucidating preferred gas migration pathways and also for assessing the relative importance of mineral dissolution and/or solution trapping efficiency. In this paper, we present a high resolution study focused on the Gorgon gas field and associated Rankin trend gases on Australia's Northwest Shelf of Australia. The gas data we present here display correlate-able trends for mole %-CO2 and %C CO2 both areally and vertically. Generally, CO2 % decreases and becomes depleted in %C (lighter) upsection and towards the north; a trend which also holds true for the greater Rankin trend gases in general. The strong spatial variation of CO2 content and %C and the interrelationship between the two suggests that processes were active to alter the two in tandem. We propose that these variations were driven by the precipitation of a carbonate phase, namely siderite, which is observed as a common late stage mineral. This conclusion is based on Rayleigh distillation modeling together with bulk rock isotopic analyses of core, which confirms that CO2 in gases are genetically related to the late stage carbonate cements. The results from this study have important implications for carbon storage operations and suggest that significant CO2 may be reacted out a gas plume over short migration distances.

Extended abstract reporting on status of geophysical work being conducted within the Remote Eastern Frontiers project.

A brief summary fo the highlights of the Paterson AEM survey and planned future work of Geoscience Australia's Airborne EM Project.

Mount Merapi in Indonesia has experienced a number of VEI 3 (Volcano Explosivity Index) eruptions in historical times. This animation simulates a 'what if' scenario for a VEI 5 eruption of Mount Merapi using the output results from a volcanic ash hazard model called FALL3D-5.1.1. The simulated eruption occurs over a 12 hour period with a modelled eruption column height of 30 km. The prevailing wind direction is modelled to the southwest towards the nearby city of Yogyakarta (28 km). The animation shows the increase in volcanic ash thickness on the ground over time. The simulation shows that if Mount Merapi erupted under these conditions the city of Yogyakarta could experience ash thicknesses on the ground between 1 and 15 m including thicknesses of 7 - 8 m at the nearby Adisucipto International Airport.

The Radiometric 3D Atlas is a series of interactive X3D Models that can be viewed in your web browser. The Atlas consists of an overall model of Australia and eight detailed regional models from each state and territory. Each model includes; images from the Radiometric, Magnetic Anomaly and Gravity Anomaly data sets; a digital elevation model; coastline, cities/towns, state borders, mines; and 1:250 000 topographic map index. Software required Geoscience Australia's X3D and older VRML models require the free plugin BS Contact and work best with the web browser Internet Explorer version 6 or higher. More information about the plugin is available from the <a href=http://www.ga.gov.au/resources/multimedia/about-3dmodels.jsp>About 3D Modelling and Required Software</a> page. Size Approximately 163 MB for all the models. Startup download is 8.52 MB - the remaining datasets download when selected.