NT
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The ca. 1.4 Ga Roper Group of northern Australia comprises the sedimentary fill of one of the most extensive Precambrian hydrocarbon-bearing basins preserved in the geological record. It is interpreted to have been deposited in a large epeiric sea known as the Roper Seaway. This study presents hydrocarbon biomarkers, high-resolution trace element redox geochemistry and neodymium isotopes of immature to mature black shales to understand the microbial diversity and palaeo-environment of the Roper Seaway.
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The Australian Government, through the Department of Resources, Energy and Tourism, has supported Geoscience Australia in undertaking a series of regional-scale, geological studies to assess the CO2 storage potential of sedimentary basins, including the Petrel Sub-basin. The studies form part of the National Low Emissions Coal Initiative designed to accelerate the development of CO2 transport and storage infrastructure near the sources of major energy and industrial emissions. The Petrel Sub-basin was identified as a high-priority region for a future pre-competitive work program by the national Carbon Storage Taskforce. The Carbon Storage Taskforce also recommended the release of greenhouse gas assessment permits, which were released within the Petrel Sub-basin in 2009. As a component of the studies at Geoscience Australia, the numerical simulation was hypothetically designed to dynamically model the reservoir behavior and CO2 migration during the injection and post-injection stages using an in-house built 3D geological model of a represented injection site. 14 million tonnes per annum (MTPA) of CO2 was injected into the lower Frigate/Elang/Plover reservoir over 30 years and CO2 plume migration was simulated up to 2,000 years from the initial injection. The injection rate of 14 MTPA of CO2 used in this study was based on the predicted 2020 CO2 emissions of the Darwin Hub, a figure defined by the Carbon Storage Taskforce (2009). The poster highlights the simulation results including CO2 plume migration distance, CO2 trapping mechanisms and reservoir pressure behavior.
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The ecosystems of northern Australia have very high global rankings in terms of the estimated dollar values of the ecosystem services they provide. Estuaries, which are abundant along the northern Australia coast, are some of the most productive ecosystems on earth, and provide vital nursery habitat for economically important species of fish and crustaceans. Most of the world's population lives in close proximity to estuaries therefore they also tend to be amongst the most degraded marine ecosystems on the planet. However, due to the small population sizes, most of Northern Australia's estuaries are unique in the respect that they are in near-pristine condition. One of the key triggers in estuarine productivity is the fresh water inflow received during the wet season and the flow recession periods afterward. To date there have been no studies of the environmental flow requirements for estuaries in the Northern Territory. As northern Australia develops there will be greater reliance on these important ecosystems for food production and recreation, while at the same time there will be competing demands for freshwater. The designation of environmental flows to river-estuary systems should be based on estuary requirements. If adequate estuarine environmental flows are maintained then it is likely that flows in upper river reaches will also be sufficient for riverine species. Studies of the roles of environmental flows on productivity in estuaries in catchments slated for development will be key in providing the foundation for economically and ecologically sustainable development of these important ecosystems. These studies will also provide additional information on how other uses of estuaries may be developed. For example wetland systems may be used for aquaculture or as watering points. Good information on estuarine processes will not only provide previously unexplored opportunities but help to ensure that our estuaries remain in excellent condition.
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The radiometric, or gamma-ray spectrometric method, measures the natural variations in the gamma-rays detected near the Earth's surface as the result of the natural radioactive decay of potassium (K), uranium (U) and thorium (Th). The data collected are processed via standard methods to ensure the response recorded is that due only to the rocks in the ground. The results produce datasets that can be interpreted to reveal the geological structure of the sub-surface. The processed data is checked for quality by GA geophysicists to ensure that the final data released by GA are fit-for-purpose. This radiometric thorium grid has a cell size of 0.00083 degrees (approximately 91m) and shows thorium element concentration of the Tanumbirini-Broadmere-Velkerri merge, 1983-2007 in units of parts per million (or ppm). The data used to produce this grid was acquired in 1983 by the NT Government, and consisted of 56185 line-kilometres of data at a line spacing between 300m and 500m, and 80m terrain clearance.
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The radiometric, or gamma-ray spectrometric method, measures the natural variations in the gamma-rays detected near the Earth's surface as the result of the natural radioactive decay of potassium (K), uranium (U) and thorium (Th). The data collected are processed via standard methods to ensure the response recorded is that due only to the rocks in the ground. The results produce datasets that can be interpreted to reveal the geological structure of the sub-surface. The processed data is checked for quality by GA geophysicists to ensure that the final data released by GA are fit-for-purpose. This radiometric uranium grid has a cell size of 0.00083 degrees (approximately 91m) and shows uranium element concentration of the Tanumbirini-Broadmere-Velkerri merge, 1983-2007 in units of parts per million (or ppm). The data used to produce this grid was acquired in 1983 by the NT Government, and consisted of 56185 line-kilometres of data at a line spacing between 300m and 500m, and 80m terrain clearance.
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The radiometric, or gamma-ray spectrometric method, measures the natural variations in the gamma-rays detected near the Earth's surface as the result of the natural radioactive decay of potassium (K), uranium (U) and thorium (Th). The data collected are processed via standard methods to ensure the response recorded is that due only to the rocks in the ground. The results produce datasets that can be interpreted to reveal the geological structure of the sub-surface. The processed data is checked for quality by GA geophysicists to ensure that the final data released by GA are fit-for-purpose. This Velkerri, NT, 1995 (P1157), radiometric line data, AWAGS levelled were acquired in 1995 by the NT Government, and consisted of 7625 line-kilometres of data at 500m line spacing and 80m terrain clearance. To constrain long wavelengths in the data, an independent data set, the Australia-wide Airborne Geophysical Survey (AWAGS) airborne magnetic data, was used to control the base levels of the survey data. This survey data is essentially levelled to AWAGS.
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Recent investigations in the Pine Creek Geosyncline in the northern part of the Northern Territory have revealed the presence of tuff within the Lower Proterozoic metasediments (Needham and others, 1978). The tuff is confined to one horizon, and crops out in the central and eastern parts of the Geosyncline, enabling stratigraphic correlations to be made between formations previously believed to have been deposited in two separate basins. Previous workers believed different kinds of sediment were laid down in each basin, and that only limited correlation was possible between the basins (Walpole and others, 1968). The regional stratigraphic concept of earlier workers was dominated by lateral and lesser vertical facies inter-fingering of units (formations), which were placed into groups, each of which contained a number of laterally disposed, lithogenetically related formations (Walpole and others, 1968). Tuff, by its depositional nature, is a time-stratigraphic indicator, so its regional conformity with metasedimentary units in the Geosyncline suggests that they are also time-stratigraphic in character, and not facies equivalents or time-transgressive as proposed previously.
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Digital Elevation data record the terrain height variations from the processed point- or line-located data recorded during a geophysical survey. This Tanami EW 5N - ground elevation geoid grid (laser) is elevation data for the NTGS Tanami EW 5N Region Detailed Airborne Magnetic Radiometric and Digital Elevation Survey, NT, 2018. This survey was acquired under the project No. 1312 for the geological survey of NT. The grid has a cell size of 0.00018 degrees (approximately 20m). This grid contains the ground elevation relative to the geoid for the NTGS Tanami EW 5N Region Detailed Airborne Magnetic Radiometric and Digital Elevation Survey, NT, 2018. It represents the vertical distance from a location on the Earth's surface to the geoid. The data are given in units of meters. The processed data is checked for quality by GA geophysicists to ensure that the final data released by GA are fit-for-purpose.
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Digital Elevation data record the terrain height variations from the processed point- or line-located data recorded during a geophysical survey. This Tanami EW 5N - ground elevation geoid grid (radar) is elevation data for the NTGS Tanami EW 5N Region Detailed Airborne Magnetic Radiometric and Digital Elevation Survey, NT, 2018. This survey was acquired under the project No. 1312 for the geological survey of NT. The grid has a cell size of 0.00018 degrees (approximately 20m). This grid contains the ground elevation relative to the geoid for the NTGS Tanami EW 5N Region Detailed Airborne Magnetic Radiometric and Digital Elevation Survey, NT, 2018. It represents the vertical distance from a location on the Earth's surface to the geoid. The data are given in units of meters. The processed data is checked for quality by GA geophysicists to ensure that the final data released by GA are fit-for-purpose.
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Digital Elevation data record the terrain height variations from the processed point- or line-located data recorded during a geophysical survey. This Tanami NS 5S - ground elevation geoid grid (radar) is elevation data for the NTGS Tanami NS 5S Region Detailed Airborne Magnetic Radiometric and Digital Elevation Survey, NT, 2018. This survey was acquired under the project No. 1312 for the geological survey of NT. The grid has a cell size of 0.00018 degrees (approximately 20m). This grid contains the ground elevation relative to the geoid for the NTGS Tanami NS 5S Region Detailed Airborne Magnetic Radiometric and Digital Elevation Survey, NT, 2018. It represents the vertical distance from a location on the Earth's surface to the geoid. The data are given in units of meters. The processed data is checked for quality by GA geophysicists to ensure that the final data released by GA are fit-for-purpose.