This map was produced as part of a 2006 series depicting Australian commonwealth fisheries and shows the area of the Beche-de-mer Fishery within the Torres Strait Fishery. The series of pdf's are available for public download from AFMA's website and the shapefiles for public download from GA's website.

This data package is an archive of geospatially located and other digital geological and geophysical data covering the Tennant Inlier in the Northern Territory, a portion of the North Australia Project undertaken to understand elements within the North Australia Craton and its boundaries. It includes digital geospatial data and/or images for a number of regional scale, 1:250 000 scale and 1:100 000 scale geological map sheets, mineral locations, geophysical images, company drill hole and rock chip locations, company and Geoscience Australia geochemistry, and other regional themes. It also includes geophysical gravity data acquired by the project in the Tennant Inlier, including an ERMapper data set.

Aim: Use a map such as the seafloor and land topography of Australia and surrounding region (GeoCat 64057 MP 03/2457.44) as a base to create an interactive animation which illustrates the geological formation of: - Heard Island an active sub-marine volcano; and - The Warrumbungle volcano an inactive volcano formed by hot spot volcanism.

A movie (~10 mins) showing the scientific discovery of the submerged reefs of the Gulf of Carpentaria. It describes the coral reef survival, growth and death; the change in sea level, global climate and ocean currents.

Introduction Developing predictive numerical models of hydrogeochemical systems requires an understanding of the physical and chemical processes affecting the composition of the water. Physical processes like mixing and evaporation can be reasonably well defined using the chemical data but redox sensitive chemical processes are more difficult to quantify. Applying the isotope chemistry of dissolved sulfate to characterise and even quantify these redox processes enhances the capabilities of numerical modelling, in particular those associated with acid mine drainage, acid sulfate soils and sulfide mineral exploration. This work describes how the stable isotopes of sulfur and oxygen in sulfate can be used to better characterise geochemical processees and thereby improve reactive transport models. Discussion Groundwater, pore water and surface water from a number of areas in Australia have been used to determine the sources of sulfur in acid sulfate susceptable systems. Several trends become apparent, sulfate reduction, and sulfide oxidation commonly dominate the chemical processes controlling sulfur in a groundwater system. Bacterial sulfate reduction (BSR) can be recognised by the affect on the 34S and 18O of sulfate. Both ratios increase as the lighter isotope is removed through dissimilatory bacterial reduction, leaving behind the heavier isotopes. Oxidation of sulfides occurs through 2 processes, one involving molecular oxygen (O2) and the other involving oxidised iron (Fe3+). The different pathways result in considerable differences in the oxygen isotopic composition of the product sulfate. Surface water and some groundwater from the Loveday basin in SA show evidence of evaporation and BSR while the near surface pore waters, although similarly evaporated, contain sulfate that predominantly originates from sulfide oxidation. Sulfate in groundwater from several other regions has stable isotopic compositions that indicate sulfide oxidation involving either the O2 or the Fe3+ pathways. The implications of are that the sulfate history can be understood through isotopic analysis and that this can be used in geochemical models to trace

Porosity and saturation are two important petrophysical properties among many others that play a crucial role in the study of reservoir characterization, flow modeling, simulation etc. Well logging techniques supplemented with geostatistical methods could provide a very high resolution estimate of those properties; but it becomes severely constrained due to availability of limited number of wells only at sparse locations. An overall estimate of porosity and saturation over a wide spatial extent (both vertically and laterally) is nonetheless necessary for a detailed study of a reservoir. We demonstrate that full waveform inversion of prestack seismic data can be a useful tool in estimating porosity and saturation of a reservoir. We conduct sensitivity analysis of porosity and saturation on seismic velocities. We use modified Biot-Gasmann equations for sensitivity analysis and forward modeling computation. A gradient-based technique aided with adaptive regularization is used for inverse modeling of full-waveform prestack seismic data. We present the results of numerical experiment on both synthetic and field seismic data.

This map was produced as part of a 2006 series depicting Australian commonwealth fisheries and shows the area of the Christmas Island and Cocos (Keeling) Islands Fishery. The series of pdf's are for public download from AFMA's website and the shapefiles for public download from GA's website.

Australia's rich neotectonic record provides an opportunity to understand the characteristics of intraplate deformation, both at the scale of a single 'active' fault and at the scale of the entire continent. Over the last decade our knowledge of Australian intraplate faults has advanced significantly (e.g. Crone et al., 1997, 2003; Clark & McCue, 2003). Herein, six preliminary seismicity source zones spanning continental Australia, and based upon neotectonics data, are proposed. Each source zone contains active faults that share common recurrence and behavioural characteristics, in a similar way that source zones are defined using the historic record of seismicity. The power of this domain approach lies in the ability to extrapolate characteristic behaviours from well-characterised faults (few) to faults about which little is known (many). This data, and conceptual and numerical models describing the nature of the seismicity in each source zone, has the potential to significantly enhance our understanding of seismic hazard in Australia at a time scale more representative than the snapshot provided by the historic record of seismicity.

Presented at the Evolution and metallogenesis of the North Australian Craton Conference, 20-22 June 2006, Alice Springs. The ca 1864 Ma Stubbins Formation is a sequence of turbiditic and mafic volcanic rocks that were informally called the Bald Hill sequence. The formation hosts the Kookaburra and Sandpiper deposits and a number of smaller prospects in the Bald Hill area of Western Australia. The ca 1835 Ma turbiditic Killi Killi Formation hosts the Coyote deposit and several nearby prospects. <p>Related product:<a href="https://www.ga.gov.au/products/servlet/controller?event=GEOCAT_DETAILS&amp;catno=64764">Evolution and metallogenesis of the North Australian Craton Conference Abstracts</p>

Presented at the Evolution and metallogenesis of the North Australian Craton Conference, 20-22 June 2006, Alice Springs. The Tanami Region (TANAMI and THE GRANITES 1:250 000 map sheet areas) is centrally located within the North Australian Craton and contains a gold-mineralised Palaeoproterozoic orogenic sequence. Page et al (1995) postulated Neo-Archaean granitic gneiss as basement to the Tanami Group, although no lower sedimentary contact has been observed. <p>Related product:<a href="https://www.ga.gov.au/products/servlet/controller?event=GEOCAT_DETAILS&amp;catno=64764">Evolution and metallogenesis of the North Australian Craton Conference Abstracts</p>