Publication year

2017

370 record(s)
 
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  • High-resolution marine sonar swath mapping, covering an area of ca. 33 km2 in the vicinity of the Windmill Islands (67° S, 110° E), Wilkes Land, east Antarctica, permits visualisation and description of the near-shore geomorphology of the seafloor environment in unprecedented detail and provides invaluable insight into the ice-sheet history of the region. Mesoproterozoic metamorphic basement exhibits prominent sets of parallel northwest-trending linear fault sets that probably formed during fragmentation of eastern Gondwana during the Mesozoic. The fault systems appear to control regional coastal physiographic features and have, in places, been preferentially eroded and exploited by subsequent glacial activity. Possibly the earliest formed glacially-derived geomorphological elements are networks of sub-glacial meltwater channels which are preserved on bedrock platforms and ridges. Subtle glacial lineations and streamlined landforms record evidence of the westward expansion of the grounded, Law Dome ice sheet margin, probably during the late Pleistocene Last Glacial Maximum, the direction of which coincides with glacial striae on onshore crystalline bedrock outcrops. The most striking glacial geomorphological features are sets of arcuate ridges confined mostly within glacially excavated `U-shaped valleys, exploiting and developed along bedrock fault sets. These ridge sets are interpreted as `push moraines or grounding zone features, formed during episodic retreat of highly channelised, topographically controlled ice-streams following ice surging, possibly in response to local environmental forcing during the mid-late Holocene. Minor post-glacial marine sedimentation is preserved in several small (1 km2) `isolated marine basins with shallow seaward sills.

  • Exploring for the Future (EFTF) is a four-year geoscience data and information collection programme that aims to better understand on a regional scale the potential mineral, energy and groundwater resources concealed under cover in northern Australia and parts of South Australia. This factsheet explains one of the activities being undertaken to collect this data and information.

  • This report outlines geoscientific advice relating to the management of Antarctic Specially Protected Area (ASPA) No. 143, Marine Plain, in the Vestfold Hills, East Antarctica. The advice is based on expert geoscientific interpretation of the relevant literature relating to human disturbance in polar environments. No field observations or experiments were undertaken as part of the preparation of this advice.

  • The Minister for Resources and Northern Australia, Senator the Hon Matthew Canavan, formally released the 2016 offshore areas for petroleum exploration on insert date here. The 28 areas are located on the North West Shelf in the Bonaparte, Browse, Roebuck, offshore Canning and Northern Carnarvon basins (Figure 1). Competitive work-program bidding for exploration permits will apply, except for three selected areas which are released under the cash-bidding scheme. These are located in the inboard part of the Northern Carnarvon Basin, where existing hydrocarbon discoveries are currently in production and where complete coverage of 3D-seismic data exists.

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    Gravity data measures small changes in gravity due to changes in the density of rocks beneath the Earth's surface. 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 Mt Isa 2006, Area A (P200640), complete Bouguer grid is a complete Bouguer anomaly grid for the Mt Isa 2006, Area A (P200640). This gravity survey was acquired under the project No. 200640 for the geological survey of QLD. The grid has a cell size of 0.00372 degrees (approximately 400m). The data are given in units of um/s^2, also known as 'gravity units', or gu. A total of 6575 gravity stations were acquired to produce this grid.

  • Categories  

    Gravity data measures small changes in gravity due to changes in the density of rocks beneath the Earth's surface. 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 Mt Isa 2006, Area A (P200640), simple Bouguer grid is a complete Bouguer anomaly grid for the Mt Isa 2006, Area A (P200640). This gravity survey was acquired under the project No. 200640 for the geological survey of QLD. The grid has a cell size of 0.00372 degrees (approximately 400m). The data are given in units of um/s^2, also known as 'gravity units', or gu. A total of 6575 gravity stations were acquired to produce this grid.

  • Categories  

    Gravity data measures small changes in gravity due to changes in the density of rocks beneath the Earth's surface. 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 Mt Isa 2006, Area A (P200640), Bouguer 1VD grid is a first vertical derivative of the Bouguer anomaly grid for the Mt Isa 2006, Area A (P200640) survey. This gravity survey was acquired under the project No. 200640 for the geological survey of QLD. The grid has a cell size of 0.00372 degrees (approximately 400m). A total of 6575 gravity stations were acquired to produce the original grid. A Fast Fourier Transform (FFT) process was applied to the original grid to calculate the first vertical derivative grid.

  • The Antarctic field notebooks contain the geological observations recorded by Bureau of Mineral Resources geologists during their trips to Antarctica. These csv files are the copies of the transcriptions made on the DigiVol transcription platform with the TEI tags removed. Please see the README file for full details. Also see HPRM8/TRIM folder A17/764 for full documentation about the project. These are the csv files that are used in the Biodiversity Heritage Library copy of the notebooks.

  • Geoscience Australia Flight Line Diagrams Catalogue Archive

  • The data covers an area of approximately 8500 sq km in the Darling river catchment area, located between Bourke, NSW and Wilcannia, NSW. A set of seamless products were produced including hydro-flattened bare earth DEMs, DSMs, Canopy Height Models (CHM) and Foliage Cover Models (FCM). The outputs of the project are compliant with National ICSM LiDAR Product Specifications and the NEDF.