Authors / CoAuthors
Whitaker, A.J. | Champion, D.C. | Stewart, A.J. | Percival, D.S. | Hanna, A.L. | Connolly, D.P. | MacGregor, C.
Abstract
The surface geology of Queensland ranges in age from Palaeoproterozoic to Recent. The oldest rocks largely occur in the Mount Isa and Georgetown Inliers in the northwest and central north of the state respectively. These rocks have undergone greenschist to amphibolite facies metamorphism and were extensively intruded by granite during the Mesoproterozoic. Metamorphics of Meso to Neoproterozoic age occur in the Coen Inlier in eastern Cape York, in the Hughenden-Charters Towers-Townsville region to the south and east of Georgetown, and also further south in the Anakie Inlier. During Cambrian to Ordovician times, extensive carbonate dominated, marine sedimentation took place in the Georgina Basin, West and southwest of Mount Isa. These rocks were subsequently faulted and gently folded prior to the Devonian, perhaps during the mid-Ordovician Thompson Orogeny. Silurian to Devonian marine sedimentation is preserved in the Hodgkinson and Broken River Basins in the north east of the state while similar aged, arc related deposits accumulated in the New England Orogen which occupies a 200 km wide coastal strip between Bowen and Brisbane in the southeast of the State. The Hodgkinson - Georgetown region and New England Orogen were extensively intruded by granite during Carboniferous to Permian times. Permian to Triassic sediments of the Galilee and Bowen Basins outcrop in the central east of the state while similar aged sediments accumulated to the east and southeast within the New England Orogen. Widespread sedimentation during the Jurassic to Cretaceous (Carpentaria, Eromanga, Mulgildie, Surat, and Laura Basins) blanketed large areas of older bedrock, particularly in the central, southern and south western parts of the state. Finally, Cainozoic cover units comprise approximately half the surface geology with sand plain (Czs), sand plain with dunes (Czd), colluvium (Qrc), alluvium (Qa), and Tertiary to Quaternary basalt flows comprising the major components. The data set was initially compiled from older regional data sets including those covering the Eromanga, Surat and Carpentaria-Karumba Basins. Extensive areas were recompiled using more recent 1:250 000 and 1:100 000 scale mapping, particularly in the Georgetown-Charters Towers-Ebagoola region, and also the area of the New England Orogen. The data set includes nearly 1800 named, informal or unnamed units.
Product Type
dataset
eCat Id
63722
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Custodian
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Cnr Jerrabomberra Ave and Hindmarsh Dr GPO Box 378
Canberra
ACT
2601
Australia
Keywords
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- GIS DatasetRegional
- ( Theme )
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- geology
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- AU-QLD
- Australian and New Zealand Standard Research Classification (ANZSRC)
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- Earth Sciences
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- Published_Internal
Publication Date
2005-01-01T00:00:00
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irregular
Topic Category
geoscientificInformation
Series Information
Lineage
Digital data were largely obtained from the Geological Survey of Queensland (GSQ) and were derived from several compilations designed for use at scales between 1:1.5 m and 1:100 k. The digital data in this compilation were either : directly incorporated; generalised first; or redrawn scanned and vectorised before incorporation. Very limited metadata were available for the data provided and thus some details were taken from respective published maps. The following list documents most the geological data sets from which the digital data were derived: 1:1.5m - 1998, Murray-Darling Basins, Digital GIS, Geoscience Australia. 1:1m - 1974, Central Eromanga Basin, GSQ; 1976, Surat Basin, GSQ; 1977, North Eromanga Basin, GSQ; 1977, NW Eromanga Basin, GSQ; 1980, Carpentaria and Karumba Basins, BMR. 1:500,000 - 1980, Moreton Geology, GSQ; 1980, Burdekin River Region, GSQ; 1988, Bowen Basin, GSQ; 1987, Mount Isa Inlier and Environs, BMR. 1:250,000 - 1985, Hay River- Mount Whelan Area southern Georgina Basin, BMR & GSQ; 1987, Fraser Is Special, GSQ; 1974, Rockhampton, GSQ; 2000, Maryborough, GSQ; 1980, Mundubbera, GSQ; 1983, Lawn Hill, GSQ; 1987, Mount Isa, GSQ & BMR; 1983, Cloncurry, GSQ & BMR; 1995, Ebagoola, GSQ & AGSO; 1996, Hann River, GSQ & AGSO; 1996, Walsh, GSQ & AGSO; 1996, Red River, AGSO & GSQ. 1:100,000 - 2004 digital data compilation by GSQ - Extensive recompilation in the Georgetown-Charters Towers-Townsville area and also for the coastal corridor from Mackay to Tween Heads . * Scanned and vectorised by Geoscience Australia from Hardcopy/Film. Edge-matching and some unit rationalisation was undertaken to achieve a unified data set. New map symbols were assigned to all map units. The logic behind map symbol construction may be requested from project staff. All surface geological polygons were assigned 'STRATNO's from the Stratigraphic Units database. Named units were assigned 'current' Stratigraphic Index numbers, while unnamed (eg. many unconsolidated Cainozoic units) and informal units were entered into the database and also received a STRATNO with the appropriate flag. The geology of eastern Mundubbera, captured by GA from the published 1:250 000 Sheet, was modified to incorporate recent mapping by GSQ. The representation of the Bundaberg area was captured from an in-progress compilation by GSQ. Units of the Georgina Basin were subdivided using the Geology of the Hay River - Mount Whelan Area, southern Georgina Basin 1:250 000 scale map (1985, GA & GSQ,) as a guide. The subdivision was carried out in consultation with GSQ staff. Plots of the data set were made in geological time slices to review unit representation at 1:1M scale. Units were in some instances combined to reduce presentation clutter at the nominal 1:1M scale. In most cases, unit rationalisation involved dissolving units at Formation status into established Group hierarchical combinations drawing on both published maps and the Stratigraphic Units database for guidance. Polygon and line attributes were updated to current GA standards for regional data sets. Most polygons smaller than 0.01 dec. deg. square (i.e. ~1 sq km; often fault slithers) were removed from the data. However, many important small units, determined by rock type, abundance, and distribution, were enlarged and retained to provide representative distribution. Several minor faults were deleted to reduce clutter at 1:1M scale.
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Extents
[-29.2, -8.9, 137.9, 154.0]
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