Upgrade for software package for geochemical modelling released in 1999. Available from OEMD on request to Evgeniy Bastrakov (a password is set for a particular user).

Geoscience Australia Marine Survey 302: Final Survey Report. by Fugro Robertson Inc, Nov. 2006 - Jan. 2007.

This ALOS processed data covers the area from Newcastle down to Batemen's Bay on the east coast of New South Wales for Geoscience Australia. The data has been delivered in a number of both tile and mosaic files. The data delivered to Geoscience Australia consists of 8 AVNIR scenes and 13 triplet PRISM scenes.

Re-examination of the Ordovician geology between Mandurama and Bigga in the Lachlan Orogen of central western New South Wales has produced new interpretations of the stratigraphy and structural geology. The Abercrombie beds have been previously inferred to comprise an Ordovician turbidite package with interbedded black shale bands. Although hampered by a paucity of fossil ages, new data suggest that the Ordovician geology of this region instead represents an imbricate stack of Lower Ordovician turbidites (Adaminaby Group) and Upper Ordovician black shales (Warbisco Shale). Structural data from the north of this region suggest that duplication occurred in a D1 event (with formation of broadly east-west to west-northwest-trending thrust slices or fold limbs) and was accompanied by formation of cleavage and isoclinal folds. Thrusting of the Adaminaby Group and Warbisco Shale over or under the Lower Ordovician Coombing Formation (southern part of the Molong volcanic belt) also occurred at this time. East-vergent imbrication and thrusting and formation of a regional near-meridional steeply west-dipping cleavage occurred in the D2 event, when D1 thrusts or folds were folded around overturned (east-vergent) D2 folds. These new data also suggest that there is a north-to-south gradient in the intensity of the D2 deformation, with D2 effects decreasing from south to north approaching the Lachlan Transverse Zone. Such a gradient mirrors similar but more subtle local changes from the north. Together, they imply that the Lachlan Transverse Zone was a major zone of weakness during north-south shortening that resulted in the formation of D1 structures but was relatively rigid in local areas during the regional D2 deformation that resulted from east-west shortening when it formed a major tear/accommodation zone. This D2 rigidity may be caused by strength imparted by the earlier emplacement of large (variably mineralised) intrusive/volcanic complexes along the transverse zone.

Geodata TOPO250K Series 3 Topographic Data - Horizontal Control Points (A point on the earths surface, of known elevation, above or below the Australian Height Datum (AHD66)). Series 3 contains a medium scale vector representation of the topography of Australia. The data include the following ten themes and 92 feature classes: Cartography: Annotations, CartographicLines, CartographicPoints, GraticuleAnnotations, Graticules, GridAnnotations and Grids Elevation: Contours, BenchMarks, HorizontalControlPoints and SpotElevations Framework: ProhibitedAreas, Reserves, FrameworkBoundaries, Islands, LargeAreaFeatures, Locations, Mainlands, Seas, GeodataIndexes and MapIndexes Habitation: BuildingAreas, BuildingPoints, BuiltUpAreas, CemeteryAreas, CemeteryPoints, Homesteads, PlaceNames, PopulatedPlaces and RecreationAreas Hydrography: CanalLines, Locks, RapidLines, Spillways, WatercourseLines, WaterfallPoints, Bores, CanalAreas, Flats, Lakes, PondageAreas, RapidAreas, Reservoirs, Springs, WatercourseAreas, Waterholes, WaterPoints, MarineHazardAreas, MarineHazardPoints and ForeshoreFlats Infrastructure: AerialCableways, DamWalls, Fences, MarineInfrastructureLines, MarineInfrastructurePoints, VerticalObstructions, WaterTanks, Yards, Conveyors, MineAreas, MinePoints, PetroleumWells and StorageTanks Terrain: Caves, Craters, DeformationAreas, Discontinuities, Pinnacles, SandRidges and Sands Transport: AircraftFacilityPoints, RailwayBridgePoints, RailwayCrossingLines, Railways, RailwayStopPoints, RailwayTunnelLines, RailwayTunnelPoints, BarrierPoints, FerryRouteLines, FootTracks, RoadCrossingLines, RoadCrossingPoints, Roads, RoadTunnelLines and RoadTunnelPoints Utility: Pipelines and Powerlines Vegetation: ClearedLines, CultivatedAreas, NativeVegetationAreas and Windbreaks

This folder contains the reports and supporting digital datasets from four geological studies published by SRK (later FrOGTech) consultants, between 2001 and 2007. Known as the OZ SEEBASE Compilation (Structurally Enhanced View of Economic Basement), the studies interpreted the three dimensional character of Australian sedimentary basins and their basement.

This map shows copper locations by Event, Type and Status. It also shows copper regions and copper occurrences that fall within these regions. The map includes a Time-Space-Event chart, and pie charts.

The Tarcoola goldfield in central South Australia is hosted by the Paleoproterozoic Paxton Granite and Tarcoola Formation metasedimentary rocks. Both of these units are intruded by narrow dikes of the Lady Jane Diorite, which is considered to be part of the Gawler Range-Hiltaba volcano-plutonic event. Crosscutting relationships and 40Ar/39Ar dating of alteration sericite and primary hornblende have demonstrated that veining, alteration, and mineralization occurred synchronously with intrusion of the diorite dikes at ~1580 Ma. Mineralization at the Perseverance deposit in the Tarcoola goldfield is hosted by quartz veins in both granite and the lower parts of the Tarcoola Formation. Alteration intensity and mineralization are related to fracture density. Very high gold grades (up to 270 ppm) are recorded in carbonaceous siltstones of the Tarcoola Formation. Primary fluid inclusions from mineralized quartz veins at Perseverance are dominated by two-phase aqueous inclusions and three-phase H2O-CO2(l)-CO2(v) ± CH4 inclusions. Both inclusion types have salinities of <10 wt percent NaCl equiv, with evidence of other salts being present. Both types homogenize between 150° and ~340°C. They occur together in single quartz grains, which suggests the coexistence of aqueous and carbonic fluids. At the Perseverance deposit the maximum depth of fluid inclusion formation is estimated as 10 km. Processes resulting from pressure fluctuations during brittle fracturing causing phase separation are suggested to be the dominant gold precipitation mechanism, although definitive fluid inclusion evidence for either phase separation or fluid mixing is lacking. Wall-rock sulfidation may have also contributed to gold deposition. Pb isotope compositions of galena from gold-bearing mineralized veins at Perseverance are similar to K-feldspar and whole-rock samples of the Paxton Granite. This is consistent with a common source of Pb and possibly other ore components for both the granite and galena, but not all potential reservoirs were tested. Variably altered and gold mineralized samples that had Paxton Granite precursors show a loss of Nd and a trend from {varepsilon}Nd(1580Ma) values of about -6.2 in slightly altered samples toward more positive {varepsilon}Nd values of about -3.3 in high-grade gold samples. Of the local lithologic units, the Lady Jane Diorite has {varepsilon}Nd(1580Ma) values of about +0.1 and is the most probable source of the more primitive Nd isotope components in mineralized samples. Mineralization in the Tarcoola goldfield has similarities to both orogenic and intrusion-related gold styles. The demonstrated coeval timing of diorite dikes and mineralization at Tarcoola, together with the Nd isotope constraints on metal sources, and the presence of similar mafic dikes in several other known gold prospects in the central Gawler gold province, suggests that the diorite was an essential part of the gold mineralization event throughout this province.

Similarities in mineralization and alteration style, host rocks, fluid compositions, and alteration-related 40Ar/39Ar ages from several recently discovered gold prospects support the existence of a significant Mesoproterozoic gold province spanning an arcuate region at least 300 km in length in the central Gawler craton, South Australia. At the recently discovered prospects of Tunkillia, Nuckulla Hill, Barns, and Weednanna, as well as at the historically mined Au deposit at Tarcoola, gold occurs as disseminated and veinlet-hosted mineralization focused in brittle to brittle-ductile faults and shear zones. Host rocks are principally ~1715 to ~1680 Ma granites but also include Hutchison Group (2000-1860 Ma) and Tarcoola Formation (~1650 Ma) metasedimentary rocks. Hydrothermal alteration is characteristically zoned around gold mineralization, with intense sericite-pyrite alteration and quartz veining proximal to gold mineralization and chlorite ± epidote ± hematite alteration distal from mineralization. Alteration was either synchronous with or, in some cases, continued after deformation. Gold is associated with pyrite and minor to trace galena, sphalerite, and chalcopyrite. Iron oxides are low in abundance in mineralized zones, which correspond to demagnetized zones. Fluid inclusion analyses suggest that multiple fluids were present in some systems, but one key fluid type occurs in each of the gold prospects: a low- to moderate-salinity (up to 10 wt % NaCl equiv) fluid with homogenization temperatures mostly in the range of ~150° to 300°C and commonly containing CO2 or associated with CO2-rich inclusions. Several features of the prospects are similar to those of orogenic- and intrusion-related gold deposits, but neither the prospect-scale geology nor the regional geologic setting in the central Gawler craton is sufficiently well understood to establish a genetic model or to confidently classify the mineralizing system. Hydrothermal white micas from several of the central Gawler craton gold prospects yield reproducible 40Ar/39Ar plateau ages of between 1567 and 1583 Ma. These ages, together with U-Pb zircon ages of granitic host rocks, constrain the timing of mineralization to the interval ~1690 to 1570 Ma, although we interpret the 40Ar/39Ar results to indicate a narrower mineralizing interval at ~1580 ± 10 Ma. This age range overlaps with, and is indistinguishable from, the range of U-Pb zircon ages reported from regional Hiltaba Suite granites and Gawler Range Volcanics, although igneous rocks of this age have not been identified locally at each of the prospects.

The Gawler craton in South Australia hosts the Olympic Dam Cu-U-Au deposit, the world's preeminent iron oxide copper-gold (IOCG) deposit and largest uranium resource. With a total resource now standing at 7.7 billion tonnes, Olympic Dam is also one of the world's largest copper and gold deposits (BHP Billiton, 2007 Annual Report). The emergence of IOCG deposits as a recognized mineral deposit class (Hitzman et al., 1992) has been followed by increasing interest in these deposits from explorers and researchers. IOCG deposits are attractive exploration targets because of their favorable grade-tonnage characteristics, credits of gold and other metals (e.g., U, Ag), and physical characteristics that are particularly amenable to geophysical exploration techniques. Despite this growing interest and an increasing number of published descriptions of the major deposits, there have been few multidisciplinary integrated studies of the regional geologic settings and metallogeny of major IOCG provinces globally. As one of the world's key IOCG provinces, the Gawler craton has experienced rapid growth in exploration expenditure this decade, resulting in discoveries of the Prominent Hill IOCG deposit in 2001 and the Carrapateena deposit in 2005 (Fig. 1Go). Over the period of these discoveries in the eastern Gawler craton, explorers in the central Gawler craton were defining a number of new gold ...