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Earth Sciences

20267 record(s)
 
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From 1 - 10 / 20267
  • This preliminary report will provide a geochemical and ionic characterisation of groundwater, to determine baseline conditions and, if possible, to distinguish between different aquifers in the Laura basin. The groundwater quality data will be compared against the water quality guidelines for aquatic ecosystem protection, drinking water use, primary industries, use by industry, recreation and aesthetics, and cultural and spiritual values to assess the environmental values of groundwater and the treatment that may be required prior to reuse or discharge.

  • Geoscience Australia carried out a marine survey on Carnarvon shelf (WA) in 2008 (SOL4769) to map seabed bathymetry and characterise benthic environments through colocated sampling of surface sediments and infauna, observation of benthic habitats using underwater towed video and stills photography, and measurement of ocean tides and wavegenerated currents. Data and samples were acquired using the Australian Institute of Marine Science (AIMS) Research Vessel Solander. Bathymetric mapping, sampling and video transects were completed in three survey areas that extended seaward from Ningaloo Reef to the shelf edge, including: Mandu Creek (80 sq km); Point Cloates (281 sq km), and; Gnaraloo (321 sq km). Additional bathymetric mapping (but no sampling or video) was completed between Mandu creek and Point Cloates, covering 277 sq km and north of Mandu Creek, covering 79 sq km. Two oceanographic moorings were deployed in the Point Cloates survey area. The survey also mapped and sampled an area to the northeast of the Muiron Islands covering 52 sq km. cloates_3m is an ArcINFO grid of Point Cloates of Carnarvon Shelf survey area produced from the processed EM3002 bathymetry data using the CARIS HIPS and SIPS software

  • The Layered Geology of Australia web map service is a seamless national coverage of Australia’s surface and subsurface geology. Geology concealed under younger cover units are mapped by effectively removing the overlying stratigraphy (Liu et al., 2015). This dataset is a layered product and comprises five chronostratigraphic time slices: Cenozoic, Mesozoic, Paleozoic, Neoproterozoic, and Pre-Neoproterozoic. As an example, the Mesozoic time slice (or layer) shows Mesozoic age geology that would be present if all Cenozoic units were removed. The Pre-Neoproterozoic time slice shows what would be visible if all Neoproterozoic, Paleozoic, Mesozoic, and Cenozoic units were removed. The Cenozoic time slice layer for the national dataset was extracted from Raymond et al., 2012. Surface Geology of Australia, 1:1 000 000 scale, 2012 edition. Geoscience Australia, Canberra.

  • This service has been created specifically for display in the National Map and the chosen symbology may not suit other mapping applications. The Australian Topographic web map service is seamless national dataset coverage for the whole of Australia. These data are best suited to graphical applications. These data may vary greatly in quality depending on the method of capture and digitising specifications in place at the time of capture. The web map service portrays detailed graphic representation of features that appear on the Earth's surface. These features include the administration boundaries from the Geoscience Australia 250K Topographic Data, including state forest and reserves.

  • The Historical Bushfire Boundaries service represents the aggregation of jurisdictional supplied burnt areas polygons stemming from the early 1900's through to 2022 (excluding the Northern Territory). The burnt area data represents curated jurisdictional owned polygons of both bushfires and prescribed (planned) burns. To ensure the dataset adhered to the nationally approved and agreed data dictionary for fire history Geoscience Australia had to modify some of the attributes presented. The information provided within this service is reflective only of data supplied by participating authoritative agencies and may or may not represent all fire history within a state.

  • Although the Bureau of Mineral Resources, Geology and Geophysics was created in 1946, it did not compile an annual report until 1971. The series continued under this title up to 1976, all but the last providing summaries of annual activities by broad sections (functions and organisation, field operations, laboratory studies, observatories, and so on). The 1976 Annual Report adopted a shorter format, a general outline of the role, objectives and programs of the Bureau being followed by a selection of short articles on the "more innovative and conclusive activities" of that year. This new format was retained in 1977 when a title change was made and the annual summaries became known as BMR Yearbooks.

  • This map shows the boundary of the Maritime Security Zones for each port for the purpose of the Maritime Transport & Office Security Act 2003. 1 Sheet (Colour) February 2010 Not for sale or public distribution. Contact Manager LOSAMBA project, PMD.

  • The tectonic evolution of the fault-bounded volcanic-sedimentary Leichhardt River fault trough is reinterpreted in the light of detailed mapping of a part of this structure. Two major unconformities are indicated, the first above the Kalkadoon-Leichhardt acid igneous complex, and the second at the base of the ore-bearing Mount Isa Group and its equivalents - the Mingera and Surprise Creek Beds. A complex succession of movements is indicated, involving (1) early faulting of the Kalkadoon-Leichhardt acid igneous complex; (2) long-acting penecontemporaneous faulting; (3) folding and uplift accompanying or post-dating emplacement of Sybella Granite, and (4) a younger major faulting phase. During phase (2) syndepositional block movements resulted in differential accumulation of volcanic flows and of sediments, reflected by abrupt thickness changes across faults. In other instances the observed thickness variations can be explained by strike faulting of lenticular sedimentary units. Basic dyke swarms which intrude the volcanic- sedimentary sequence of the Leichhardt River fault trough have postdated the folding and predated the major faulting event defined as phase (4). The Sybella Granite, thought by some workers to be younger than the Mount Isa Group on the basis of structure and lead isotope ratios, is considered by us to be older than this unit. The ore lead in the Mount Isa deposit could be related to erosion or leaching of lead from older rocks such as the Kalkadoon-Leichhardt basement complex and the Eastern Creek Volcanics. An age of between I500-1600 m.y. is indicated for the syngenetic lead deposit at Mount Isa. The Eastern Creek Volcanics show very high Pb relative to average basalt, and high Cu, Zn and Pb levels relative to other basic volcanic rocks in this region, and may have a genetic relation to the Mount Isa Cu and Ag-Pb-Zn ore deposits. Geochemical features of basalts of the Eastern Creek Volcanics are consistent with those of continental flood tholeiites, showing high FeO, FeO/ MgO ratios, TiO2, K2O, P2O5, Ba and Rb and low Al2O3. Structural, sedimentological and geochemical changes between the Mount Isa area and the CIoncurry area to the east - where ocean floor type tholeiites occur - can be interpreted in terms of a transition into a continental margin environment in this direction.

  • Many Queensland rivers have extensive deltas, which have large reserves of groundwater. These deltas contain fertile land suitable for intense agricultural development with associated towns and industry, all relying on groundwater for their water supply requirements. In some areas, extensive water use, especially in dry times, has resulted in saltwater intrusion into the aquifers. Management techniques have had to be developed and implemented to ensure the sustainability of these supplies. Individual hydrological situations have to be managed in different ways to take full advantage of the resources available. Options for management include artificial recharge schemes where conditions are suitable and surface water is available, or the provision of supplementary supplies from surface water storages to relieve demand on the groundwater resources. Restrictions on use may have to be applied during dry period and, in some cases, deliberate overuse with subsequent intrusion of saltwater has been permitted to encourage agricultural development of certain areas, with surface water being supplied when it became available. Extensive monitoring of groundwater levels and quality is carried out to detect any movement of the freshwater/saltwater interface. Models are used to predict future movement. The experience in Queensland has been that engineering works, coupled with management linked to predictive groundwater models, can reduce saltwater intrusion and provide high sustainable yields from coastal aquifers.

  • Product no longer exists, please refer to GeoCat #30413 for the data