Found 500 items for "surface geology maps crustal elements" in Data & Publications
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This map was created from the Surface Geology of Australia (1:1M scale) dataset, plotted at 1:15 million scale. The Surface Geology of Australia data was compiled by standardising and edge-matching over 400 geological maps which have been published by Australian Government, State and Territory agencies over the past 40 years. This seamless digital dataset is the most detailed national coverage available of the continent and islands. It provides information on the distribution and type of over 5000 outcropping bedrock and regolith units, such as sand plains and dunes.
Igneous rocks have long been recognised as an important source of metals in uranium mineral systems. Although magmas may form mineral deposits in their own right, they may also contribute directly to basin-related mineral systems as a source of metals and/or ligands. Thus, mapping of the distribution of uranium in igneous rocks has the potential to highlight potentially prospective regions for uranium mineralisation at a macro-scale. Map 2 in the series of three maps of the uranium content of Australian igneous rocks shows polygons of igneous rock distribution, derived from the Geoscience Australia 1:1,000,000 national surface geology dataset. Polygons are coloured by their average uranium content. The average uranium content of each polygon was calculated by plotting the igneous polygons together with geochemical sample points (distribution shown in Map 1 of the series) using ArcGIS software. Each polygon was then attributed with the average uranium value (in ppm) of all intersecting geochemical sample points. This approach allows igneous uranium content to be assessed on the pluton- to province-scale, depending on polygon resolution. Together with the two other maps in the series, this map demonstrates the close spatial relationship between uranium-rich igneous rocks and areas of known uranium mineralisation. In addition, new regions previously unknown for uranium mineralisation can be identified.
Igneous rocks have long been recognised as an important source of metals in uranium mineral systems. Although magmas may form mineral deposits in their own right, they may also contribute directly to basin-related mineral systems as a source of metals and/or ligands. Thus, mapping of the distribution of uranium in igneous rocks has the potential to highlight potentially prospective regions for uranium mineralisation at a macro-scale. This map is the first in a series of three showing the uranium content of Australian igneous rocks. Map 1 shows the individual geochemical data points compiled for this study. Points are coloured and sized based on their uranium content. Igneous rock types from Geoscience Australia's 1:1,000,000 national surface geology dataset are also shown in the background. Geochemical analyses from igneous rock types spanning all compositions have been utilised, despite the low total abundance of uranium in ultramafic, mafic and intermediate compositions. Together with the two other maps in the series, this map demonstrates the close spatial relationship between uranium-rich igneous rocks and areas of known uranium mineralisation. In addition, new regions previously unknown for uranium mineralisation can be identified.
The Australian Crustal Elements dataset delineates upper crustal elements, primarily based on composite geophysical domains, each of which shows a distinctive pattern of magnetic and gravity anomalies. These elements generally relate to the basement, rather than the sedimentary basins. Boundaries between these elements are interpreted to mark crustal-scale changes in composition or structural pattern, or both. Where feasible, these boundaries are chosen to emphasise their correlation with the outcropping boundaries of geological provinces.
Legacy product - no abstract available
Australia crustal elements map based on the distribution of geophysical domains
The Surface Geology of Australia data package includes: - Surface Geology of Australia, 1:1M scale (2012 edition) [GeoCat #74619 ] - Surface Geology of Australia, 1:2.5M scale (2012 edition) [GeoCat #73140 ], and - the national Geological Regions dataset [GeoCat #32366 ]. DVD data package of 3 national geological datasets
Australia crustal elements map based on the distrubution of geophysical domains 1:5million
User-defined PDF maps of the Surface Geology of Australia (1:1 million scale) can be generated using the MapConnect online mapping application. The MapConnect tool allows users to zoom to an area of interest, overlay topographic information, and create PDF maps. The digital surface geology data may also be downloaded from the MapConnect application.
The Surface Geology of Australia 1:1M scale dataset (2012 edition) is a seamless national coverage of outcrop and surficial geology, compiled for use at or around 1:1 million scale. The data maps outcropping bedrock geology and unconsolidated or poorly consolidated regolith material covering bedrock. Geological units are represented as polygon and line geometries, and are attributed with information regarding stratigraphic nomenclature and hierarchy, age, lithology, and primary data source. The dataset also contains geological contacts, structural features such as faults and shears, and miscellaneous supporting lines like the boundaries of water and ice bodies. The 2012 dataset has been updated from the previous 2010 data by updating geological unit data to 2012 information in the Australian Stratigraphic Units Database (http://www.ga.gov.au/products-services/data-applications/reference-databases/stratigraphic-units.html), incorporating new published mapping in the Northern Territory and Queensland, and correcting errors or inconsistent data identified in the previous edition, particularly in the Phanerozoic geology of Western Australia. The attribute structure of the dataset has also been revised to be more compatible with the GeoSciML data standard, published by the IUGS Commission for Geoscience Information. The first edition of this national dataset was first released in 2008, with map data compiled largely from simplifying and edgematching existing 1:250 000 scale geological maps. Where these maps were not current, more recent source maps ranging in scale from 1:50 000 to 1:1 million were used. In some areas where the only available geological maps were old and poorly located, some repositioning of mapping using recent satellite imagery or geophysics was employed.