22058 record(s)
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  • 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

  • No abstract available

  • Initial lead isotope ratios from Archean volcanic-hosted massive sulfide (VHMS) and lode gold deposits and neodymium isotope model ages from igneous rocks from the geological provinces that host these deposits identify systematic spatial and temporal patterns, both within and between the provinces. The Abitibi-Wawa Subprovince of the Superior Province is characterized by highly juvenile lead and neodymium. Most other Archean provinces, however, are characterized by more evolved isotopes, although domains within them can be characterized by juvenile isotope ratios. Metal endowment (measured as the quantity of metal contained in geological resources per unit surface area) of VHMS and komatiite-associated nickel sulfide (KANS) deposits is related to the isotopic character, and therefore the tectonic history, of provinces that host these deposits. Provinces with extensive juvenile crust have significantly higher endowment of VHMS deposits, possibly as a consequence of higher heat flow and extension-related faults. Provinces with evolved crust have higher endowment of KANS deposits, possibly because such crust provided either a source of sulfur or a stable substrate for komatiite emplacement. In any case, initial radiogenic isotope ratios can be useful in predicting the endowment of Archean terranes for VHMS and KANS deposits. Limited data suggest similar relationships may hold in younger terranes.

  • This layer shows the location of Ramsar wetlands on Christmas Island. It wss provided by Christmas Island National Park staff in 2012 as a shapefile.

  • This presentation was delivered at the 30th NZ Geothermal Workshop in Taupo, New Zealand (10 - 13th November 2008). It summarises the key initiatives the Australian Government and State Governments have in place to support the growth of Australia's young geothermal industry.

  • This document describes a format of the PRISM (Panchromatic Remote sensing Instrument for Stereo Mapping ) products generated by the ALOS data processing subsystem.

  • Australia's Large Igneous Provinces (LIPs) span most of Earth's geological history, ranging from Early Archean to Recent. LIPs in continental Australia are represented by continental flood basalts, fragments of oceanic plateaux, layered mafic-ultramafic intrusions, sill complexes and dyke swarms. It is only in the last decade that geologists have started to focus on LIPs in Australia, mainly from the perspective of their mineral potential, particularly after the discovery of the Nebo-Babel Ni-Cu-PGE deposit in the West Musgrave Province, central Australia. The list of LIPs increased by including other well-known igneous provinces, such as the Fortescue, Warakurna, Hart-Carson, Kalkarindji (formerly known as Antrim Plateau Volcanics) and various dyke swarms (e.g., Widgiemooltha, Marnda Moorn, Gairdner). The Bunbury Basalt, although only covering a small area in the Cape Naturaliste-Cape Leeuwin peninsula, joined the list of LIPs, due to its age links with the huge Kerguelen oceanic plateau magmatism. As indicated by the world-class Nebo-Babel deposit and further discoveries in the West Musgrave and in the Kimberley region, the mineral potential of LIPs is very high. In the case of orthomagmatic mineral systems, the selection of areas or specific intrusions requires focusing on isotope systematics and trace- and major-element geochemical trends to filter out mafic-ultramafic intrusions that may not have undergone sulphur saturation from those that have experienced sulphur saturation from processes, such as crustal contamination. In eastern Australia, there are two major volcanic provinces: the Early Cretaceous Whitsunday volcanic province, which is a good example of a silicic LIP, and a 4400 km long belt characterised by recent (youngest volcano is 4600 years ago) intraplate alkaline volcanism. The mineral potential associated with these provinces is as yet not fully assessed.

  • 33% coverage west 22-1/H52-8/15 Vertical scale: 200

  • The product SAR.SLC is a single look complex digital image generated from raw SAR data using up-to-date auxiliary parameters. The image, projected on sland range, referred to as 'quarter scene' or quadrant corresponds to approximately one half (range) by one half (azimuth) of a full scence image. The ESA SAR.SLC format is based on the general definition of the SAR CEOS format (ref. ER-IS-EPS-GS-5902).