From 1 - 10 / 517
  • This map shows public and private land tenure, including Aboriginal and Torres Strait Islander land for the whole of Australia at a scale of 1:4.7 million. The land tenure boundaries depicted on this map generally define broadly classified areas greater than 50 square kilometres. Aboriginal land areas between 0.1 and 100 square kilometres are shown more comprehensively by symbols. The information on this map is complemented by statistical tables giving the total area of the land tenure categories for each state and territory. Also available as GIS data.

  • Legacy product - no abstract available

  • Australia magnetic anomaly pixel map

  • Palaeontological and biostratigraphic studies for each Phanerozoic system are briefly summarised for the entire Canning Basin, with emphasis on the Palaeozoic. Biostratigraphic analysis of sixkey wells on the Lennard Shelf (May River 1, Langoora 1, Meda 1, Meda 2, Blackstone 1 and.Mimosa 1) are given in an Appendix. A synthesis of this information has led to the identificationof ten major stratigraphic breaks within the Palaeozoic succession on the Lennard Shelf: 1.The entire Cambrian Period and most of the Tremadocian. 2.Much of the Silurian and the Early Devonian (resulting from an Early Silurian age for theWorral Formation, and a Late Ordovician - earliest Silurian age for the underlying CarribuddyGroup). 3.Within the early Famennian (a break of variable duration in different parts of the study area). 4.WI& the late Famennian (corresponding to the Upper postera, and Lower expansa conodontZones). 5.Within the latest Famennian (Strunian - possibly representing the global sea-level fall in theMiddle praesulcata Zone, just prior to the WC boundary). 6.Within the latest Toumaisian-early Visean (between the Laurel Formation and the AndersonFormation; the least plausible stratigraphic break). 7.Within the latest Visean-early Namurian (representing the maculosa assemblage). 8.The late Westphalian and most or all of the Stephanian (representing the birkheadensis Zone). 9.The early part of the Sterlitamaldan Stage (between the base of the Nura Nura Member of thePoole Sandstone, and the top of the Grant Group. 10.The latest Permian (Dorashamian = Changhsingian) Stage (representing the Protohaploxypinus microcotpus Zone; between the upper part of the Hardman Formation and thelower part of the Blina Shale). Biostratigraphic control provided by conodonts, ostracods, naicrovertebrates and spores hasunderpinned AGSO sequence analyses of seismic and well data for a new interpretation of theoutcropping and subsurface Late Devonian reef complexes. Revised ages effect theunderstanding of the petroleum resource potential in the Ordovician sequence. Some formationswithin the Carribuddy Group may behave as effective seals to source and reservoir rocks in theNita Goldwyer Formations.

  • The Cullen Mineral Field, lying in the southern central part of the Pine Creek Geosyncline, contains early Proterozoic metasediments of the Namoona, Mount Partridge, South Alligator, and Finniss River Groups. The metasediments, originally shale, siltstone, quartz sandstone, conglomerate, greywacke, dolomite, dolarenite, dololutite and tuff, were intruded by pre-orogenic sills of Zamu Dolerite before being deformed and metamorphosed to greenschist facies between 1870 and 1780 Ma. These rocks, together with unconformably overlying felsic volcanics (El Sherana and Edith River Groups), were extensively metamorphosed by syn- to post-orogenic granitoids of the Cullen Batholith emplaced between 1830 and 1780 Ma. The Batholith contains granodiorite, several varieties of granite and leucogranite, bodies of monzonite, and younger syenite dykes. Largely undeformed Middle Proterozoic, Palaeozoic, and Mesowic strata rest on earlyProterozoic rocks with marked regional unconformity and form tablelands and plains bordering the mineral field to the southwest and southeast. The main forms of metal occurrence are: hydrothermal veins and stockworks (Sn, W, Au, Ag, Pb, Zn, Cd, Cu, Bi, As, D, and Mo); volcanogenic stratabound massive sulphide deposits (Au, Ag, Cu, Pb, and Zn); alluvial deposits (Au and Sn); and residual massive oxide deposits (Fe and Mn).The vast majority of mines have worked hydrothermal deposits which are mostly located in north to northwest-trending faults, shear zones, and associated structures within early Proterozoic metasediments and granitoids. Pyritic, dolomitic and carbonaceous strata are preferentially mineralised, especially within the Koolpin and Mount Bonnie Formations. The distribution of deposits within the contact aureole defines a zonation of uranium closest to granite, through tungsten, copper, tin, silver-lead, to gold with increasing distance from the granitoid contact. This nation probably reflects decreasing temperatures within the contact aureole at the time of generation of a variety of metal-bearing fluids, either during granitoid emplacement or later. A magmatic source for some of the metals is indicated, particularly in late-stage, highly fractionated leucogranites which form cusps peripheral to the main body of the Cullen Batholith. The Cullen Mineral Field has been a major centre of metal production, mainly for gold, silver, lead, copper, tin, tungsten and iron. Minor zinc, cadmium. bismuth, arsenic, molybdenum, uranium and limestone have also been won.

  • 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, uranium and thorium. The data are collected on airborne geophysical surveys conducted by Commonwealth, State & NT Governments and the private sector.

  • Survey conducted by the Commonwealth Government or State/Territory Geological Survey (or equivalent) collecting airborne geophysical data

  • Australia magnetic anomaly pixel map

  • Albany Offshore Resource Map