Deep seismic reflection data across the Western Lachlan Orogen of southeast Australia have provided important insights into crustal-scale fluid pathways and possible source rocks across one of the world's richest orogenic gold provinces. The profiles span three of Victoria's most productive structural zones: the Stawell, Bendigo and Melbourne zones. Zone-scale variations in the age and style of gold deposits are reflected by changes in crustal structure and composition as revealed by the seismic data. The Stawell and Bendigo structural zones can be broadly divided into a lower region of interlayered meta-volcanic and meta-sedimentary rocks and an upper region of meta-sedimentary rocks. First-order faults appear to have accommodated large scale crustal thickening down to the lower crust. The bilateral distribution of gold production in the Stawell and Bendigo zones is related to the V-shaped crustal-scale geometry of the two zones in cross-section. Major first-order faults, like the east dipping Moyston Fault and a set of west dipping listric faults, were major fluid conduits during the most important gold event at 440 Ma. These first-order faults converge in the mid and lower crust in a region beneath the western Bendigo Zone where mafic volcanic rocks are identified as a likely common source of metamorphic fluids and gold during the main 440 Ma mineralizing event.

Mineral Systems Workshops May 2008 Mineral Systems and Exploration Science

The effect of offshore coral reefs on the impact from a tsunami remains controversial. For example, field surveys after the 2004 Indian Ocean tsunami indicate that the energy of the tsunami was reduced by natural coral reef barriers in Sri Lanka, but there was no indication that coral reefs off Banda Aceh, Indonesia had any effect on the tsunami. In this paper, we investigate whether the Great Barrier Reef offshore Queensland, Australia, may have weakened the tsunami impact from the 2007 Solomon Islands earthquake. The fault slip distribution of the 2007 Solomon Islands earthquake was firstly obtained by teleseismic inversion. The tsunami was then propagated to shallow water just offshore the coast by solving the linear shallow water equations using a staggered grid finite difference method. We used a relatively high resolution (approximately 250m) bathymetric grid for the region just off the coast containing the reef. The tsunami waveforms recorded at tide gauge stations along the Australian coast were then compared to the results from the tsunami simulation when using both the realistic 250m resolution bathymetry and with two grids with an imaginary bathymetry. One of the grids with an imaginary bathymetry removes the coral reef and interpolates an artificial bathymetry across it. The other imaginary grid replaces the reef with a flat plane at a depth equal to the mean water depth of the Great Barrier Reef. From the comparison between the synthetic waveforms both with and without the Great Barrier Reef, we found that the Great Barrier Reef significantly weakened the tsunami impact. According to our model, the coral reefs delayed the tsunami arrival time by 5-10 minutes, decreased the amplitude of the first tsunami pulse to half or less, and made the period of the tsunami longer.

This publication is the successor to Oil and Gas Resources of Australia 2006 and continues as the definitive reference on exploration, development and production of Australia's petroleum resources. The tables describe: - wells drilled - seismic surveys - petroleum discoveries - petroleum reserves - production and development including a chronological listing of offshore facilities

In this paper we present a new model to assess severe wind hazard in Australia. The model is especially suitable for regions where there is no recording data. The model uses simulation data produced by a high resolution regional climate model. It compares wind speeds produced by the climate model with speeds from observed records and develops a function which allows wind engineers to correct the simulation data in order to match the observed wind speed data. The model has been validated in a number of locations where observed records are available.

A 3D map of the Cooper Basin region has been produced over an area of 300 x 450 km to a depth of 20 km (Figure 1). The map was constructed from 3D inversions of gravity data using geological data to constrain the inversions. It delineates regions of low density within the basement of the Cooper / Eromanga Basins that are inferred to be granitic bodies. This interpretation is supported by a spatial correlation between the modelled bodies and known granite occurrences. The map, which also delineates the 3D geometries of the Cooper and Eromanga Basins, therefore incorporates both potential heat sources and thermally insulating cover, key elements in locating a geothermal play. A smaller region of the Cooper Basin 3D map (Figure 1) has been used as a test-bed for GeoModeller's 3D thermal modelling capability. The thermal modelling described herein is a work in progress and is being carried out to test the capability of the thermal modelling component of 3D GeoModeller, as well as to test our understanding of the thermal properties of the Cooper Basin region.

Map produced for the Australian Government Solicitor in December 2008 showing the Torres Strait Regional Claim (Q6040 of 2001) as mofidied and the Eastern Tuna and Billfish Fishery. For confidental/internal use by AGS and not for general release.

Two full-colour map sheets (at 1:5 million and 1:10 million scales) that show the continental extent and age relationships of Proterozoic mafic and ultramafic rocks and associated mineral deposits throughout the continent. These rocks have been assigned to 30 Magmatic Events (ME) ranging in age from the Early Palaeoproterozoic ~2455 Ma (ME 1) to the Early Cambrian ~520 Ma (ME 30). The presence and correlation of these Magmatic Events into five Major Crustal Elements and 28 provinces are represented in a Time-Space-Event Chart on Sheet 2. Enlarged inset maps on Sheet 1 provide in more detail the polygon and line data of certain regions, and other inset maps on Sheet 2 show the distribution of Proterozoic and Archaean rocks, mineral deposits and occurrences, and five Large Igneous Provinces (LIPs). This national map supersedes two similar 'Proterozoic Mafic-Ultramafic Magmatic Events' maps relating to Western Australia (2006; GeoCat 64813) and the Northern Territory-South Australia (2007; GeoCat 65257). A user guide to the map series is described in Geocat 66624. A georeferenced image of the map Australian Proterozoic Mafic-Ultramafic Magmatic Events (Sheet 1) is also provided. The image shows spatial distribution of Proterozoic (2500 Ma to 545 Ma) mafic-ultramafic magmatic events in Australia. The map illustrates for the first time, the continental extent and age relationships of Proterozoic mafic and ultramafic rocks and their associated mineral deposits. The image has been georeferenced using ESRI ArcGIS 9.3 software. Projection: Lambert Conformal Conic Datum: Geocentric Datum of Australia 1994 False Easting: 0.00000000 False Northing: 0.00000000 Central Meridian: 134.00000000 Standard Parallel 1: -18.00000000; Standard Parallel 2: -36.00000000 Latitude Of Origin: 0.00000000 The package contains five files contained in a ZIP file [ZIP 25MB]: geo_national_mafic_part1_300dpi1.rrd geo_national_mafic_part1_300dpi1.xml geo_national_mafic_part1_300dpi1.aux geo_national_mafic_part1_300dpi1.jpg geo_national_mafic_part1_300dpi1.jwg <h3>Related products:</h3><a href="https://www.ga.gov.au/products/servlet/controller?event=GEOCAT_DETAILS&amp;catno=66624">Guide to Using the Australian Proterozoic Mafic-Ultramafic Magmatic Events Map</a> <a href="https://www.ga.gov.au/products/servlet/controller?event=GEOCAT_DETAILS&amp;catno=70461">Proterozoic Mafic-Ultramafic Magmatic Events Resource Package</a> <a href="https://www.ga.gov.au/products/servlet/controller?event=GEOCAT_DETAILS&amp;catno=69347">Archean Mafic-Ultramafic Magmatic Events Resource Package</a> <a href="https://www.ga.gov.au/products/servlet/controller?event=GEOCAT_DETAILS&amp;catno=69935">Guide to using the Australian Archean Mafic-Ultramafic Magmatic Events Map</a> <a href="https://www.ga.gov.au/products/servlet/controller?event=GEOCAT_DETAILS&amp;catno=69213">Proterozoic Large Igneous Provinces: Map Sheets 1 and 2</a> <a href="https://www.ga.gov.au/products/servlet/controller?event=GEOCAT_DETAILS&amp;catno=70008">Guide to using the Map of Australian Proterozoic Large Igneous Provinces</a>

Processed seismic data (SEG-Y format) and TIFF images for the 2006 Mt Isa Deep Crustal Seismic Survey (L180), acquired by Geoscience Australia (GA) under the Onshore Energy Security Program (OESP), in collaboration with the Queensland Geological Survey, the pmd*CRC and Zinifex Ltd. Stack and migrated data for lines 06GA-M1 to 06GA-M6 as well as CDP coordinates and maps. Raw data for this survey are available on request from clientservices@ga.gov.au

Collated Arc/Info, ArcView and ArcGIS datasets of WA regolith-landform maps at various scales, produced by research staff and students of the Cooperative Research Centre for Landscape Evolution and Mineral Exploration and the Cooperative Research Centre for Landscape Environments and Mineral Exploration