geoscience databases
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No abstract available
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This dataset is a spatial representation of the OZMIN Oracle relational database containing geological and resource information for Australian mineral deposits. OZMIN has been compiled from published references and has been designed so that attribute information can be retrieved and analysed in relation to spatial data contained in geographic information systems. The national mineral deposits dataset contains data on more than 1050 major and historically significant mineral deposits for 60 mineral commodities (including coal): over 7400 references cited.
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Abstract There are two parts to this paper, The Data and The Remastering / Robotics Project The Data This part of the paper describes the types of data and how they are collected. The data includes seismic data, geophysical datasets, marine seafloor and fluid samples. Geoscience Australia assists exploration companies in the identification of new areas with potential for hydrocarbon discovery through the creation of geoscientific knowledge supported by databases and information systems. The Remastering Project This part of the paper describes how the digital data are stored, migrated and preserved. As part of the Australian Government's New Petroleum Initiative the 2003 Federal Budget provided funding of $10 million over four years for the transcription to high density media (3590B cartridges) of older seismic survey and well data on 9 and 21 track tapes and 3480 cartridges.
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Geoscience Australia and State and Territory Geological Surveys have systematically surveyed most of the Australian continent over the past 40 years using airborne gamma-ray spectrometry to map potassium, uranium and thorium elemental concentrations at the Earth's surface. However, the individual surveys that comprise the national gamma-ray spectrometric radioelement database are not all registered to the same datum. This limits the usefulness of the database as it is not possible to easily combine surveys into regional compilations or make accurate comparisons between radiometric signatures in different survey areas. To solve these problems, Geoscience Australia has undertaken an Australia-Wide Airborne Geophysical Survey (AWAGS), funded under the Australian Government's Onshore Energy Security Program, to serve as a radioelement baseline for all current and future airborne gamma-ray spectrometric surveys in Australia. The AWAGS survey has been back-calibrated to the International Atomic Energy Agency's (IAEA) radioelement datum. We have used the AWAGS data to level the national radioelement database by estimating survey correction factors that, once applied, minimize both the differences in radioelement estimates between surveys (where these surveys overlap) and the differences between the surveys and the AWAGS traverses. The database is thus effectively levelled to the IAEA datum. The levelled database has been used to produce the first 'Radiometric Map of Australia' - levelled and merged composite potassium (% K), uranium (ppm eU) and thorium (ppm eTh) grids over Australia at 100 m resolution. Interpreters can use the map to reliably compare the radiometric signatures observed over different parts of Australia. This enables the assessment of key mineralogical and geochemical properties of bedrock and regolith materials from different geological provinces and regions with contrasting landscape histories.
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Package comprises a digital compilation of regional mapping of Bathurst (SI5508) 1:250 000 map by AGSO and NSW Department of Mineral Resources, under NGMA from 1991 to 1996.
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Legacy product - no abstract available
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Legacy product - no abstract available
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Australia's geochemical environment affects our well-being. It directly affects public health, agriculture and mining activities, yet nation-wide geochemical surveys such as conducted in the United Kingdom, Wales and China are yet to be established in Australia. To obtain the most information from geochemical data, appropriate methodologies to analyse the data are essential. This report investigates the use of various methodologies for the assessment and integration of whole-rock geochemical data at regional and local scales. A broad-scale regional study conducted over southeastern Australia, mainly focused on NSW and Victoria, whilst the other was a more specific study conducted over the Bathurst 1:250,000 map sheet area. Regional scale studies have low sample densities and the possibility of sampling bias being incorporated and intensified during data analysis across large areas are high. However, regional scale mapping is a low cost, time efficient way of identifying broad trends and smaller target areas. Accordingly, the methods used on regional data are quick and easy with relatively little data preparation. Mineral occurrence densities were created and concentrations of uranium, lead, zinc, gold and arsenic were overlaid to identify anomalous values. Hot spots for these elements often corresponded to mining districts. However, the analysis highlighted that some anomalous samples related to local mineralisation and should have been removed from the analysis. The Bathurst study area had a higher sample density so more comprehensive analysis was possible. Statistical analysis was conducted which identified spurious data that were then removed from the dataset. The geochemical points were validated to ensure that they were in the correct geological polygon and hence there was a higher confidence in the data than in the regional scale study. The geochemical values were averaged across like geological polygons and trends of elemental concentrations in rock types became apparent. This was important as it allowed the geochemistry to be viewed in its geological context. Both studies indicated that existing whole-rock geochemical data is inappropriate for baseline geochemical surveying due to sample biases associated with the data. It does, however, identify methods that can be applied to the more appropriate data. The studies identified the need for conducting a nation-wide baseline geochemical survey. Benefits of such a survey would include a raised awareness of public health, agricultural, environmental and land use issues, as well as helping to identify mineral resource targets. It is recognised that determining high concentrations of elements is not in itself sufficient as high background concentrations may not lead to the formation of an ore deposit, nor be detrimental to human and animal health. An assessment of bioavailability is critical because elements may occur in stable compounds within the environment hence will not pose a health risk, no matter how high their concentrations. As a follow-on from this study, assessment of element bioavailability is an important step.
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Legacy product - no abstract available
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No abstract available