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  • This map is part of the series that covers the whole of Australia at a scale of 1:250 000 (1cm on a map represents 2.5 km on the ground) and comprises 513 maps. This is the largest scale at which published topographic maps cover the entire continent. Each standard map covers an area of 1.5 degrees longitude by 1 degree latitude or about 150 kilometres from east to west and 110 kilometres from north to south. There are about 50 special maps in the series and these maps cover a non-standard area. Typically, where a map produced on standard sheet lines is largely ocean it is combined with its landward neighbour. These maps contain natural and constructed features including road and rail infrastructure, vegetation, hydrography, contours (interval 50m), localities and some administrative boundaries. The topographic map and data index shows coverage of the sheets. Product Specifications Coverage: The series covers the whole of Australia with 513 maps. Currency: Ranges from 1995 to 2009. 95% of maps have a reliability date of 1994 or later. Coordinates: Geographical and either AMG or MGA (post-1993) Datum: AGD66, GDA94, AHD. Projection: Universal Traverse Mercator (UTM) Medium: Paper, flat and folded copies.

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

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

  • Until recently, the development of better constrained models for gold mineralisation in the western Lachlan Fold Belt has been hindered by the paucity of data on the chemistry of the ore-bearing fluids, the temperatures and pressures at the time of mineralisation, and the extent and nature of wallrock alteration. Newly available data, however, has allowed us to use thermodynamic mass transfer modelling to test some of the models proposed for gold mineralisation in the western Lachlan Fold Belt and to investigate whether the results of the modelling correlate with the styles of mineralisation and alteration assemblages observed in these turbidite-hosted gold deposits. The first model (cf. Keays, 1987) invokes initial seawater alteration of tholeiitic rocks, followed by leaching of gold from these rocks by a metamorphic fluid. This fluid then ascends into the overlying turbidite succession where fault-valve behaviour leads to phase separation and progressive water-rock interaction. Phase separation results in gold precipitation but the associated mineral assemblage contains significant amounts of feldspar, epidote and prehnite, which is not in accord with observed vein and alteration mineralogies. The third model (cf. Gray et al., 1991; and Cox et al.,1995) proposes that the ore-bearing fluids originated from metamorphic devolatilisation process occurring in deep level crustal rocks. This fluid then ascends to upper crustal levels as before. Phase separation leads to a relatively large decrease in the activity of sulfur in the fluid, resulting in gold precipitation and the precipitation of quartz, muscovite, arsenopyrite with chlorite, feldspar and pyrite forming at lower water-rock ratios. Therefore, this model is the one that best reproduces the vein and alteration assemblages commonly observed in the western Lachlan Fold Belt.

  • The Archaean granite-greenstones in the Sir Samuel 1:250 000 sheet area can be broadly divided into three north- to north-northwest strips of greenstones that are separated by large areas of granitoid. The west strip varies in width from 2 to 17 km, and includes the Perseverance-Mount Keith, Agnew, and Yakabindie greenstones belts. The far west part of the sheet is largely granitoid, with an arcuate belt up to 18 km wide of highly deformed and gneissic granitoid west of the Waroonga Shear Zone. The southern Yandal greenstone belt is separated from the Perseverance-Mount Keith greenstone belt by a large area of granitoid, including the sigmoidal Koonoonooka monzogranite, and a highly deformed zone, up to 12 km wide, of interleaved granitoid and greenstone west of the Mount McClure Fault. Part of the Dingo Range greenstone belt occurs in the northeast. The Yakabindie greenstone belt comprises a layered sequence of Kathleen Valley Gabbro overlain by massive tholeiitic Mount Goode Basalt. The Agnew greenstone belt comprises a lower sequence of metamorphosed ultramafic, mafic, felsic volcanic, and sedimentary rocks, which is exposed in the Agnew and Leinster Anticlines. The upper sequence, mainly in the Mount White Syncline area, consists of metabasalt, metagabbro and metasedimentary rocks. Metamorphosed ultramafic, mafic, felsic volcanic and sedimentary rocks in the Perseverance area extend father north to west of Mount Pasco. North of Six Mile Well, ultramafic, sedimentary, and felsic volcanic/volcaniclastic rocks correlate with the greenstone sequences through Mount Keith to Wiluna. The Jones Creek Conglomerate represents a late clastic sequence and is restricted to a narrow, fault-bounded zone between the Yakabindie greenstone belt and granite in the west and the Perseverance-Mount Keith and Agnew greenstone belts to the east.