Showing results for: [ Tyler, Ian ]
The ASTER geoscience map of Australia is a set of digital geoscience products generated from satellite ASTER data. ASTER (Advanced Spaceborne Thermal Emission and Reflection Radiometer) is a Japanese ... moreimaging instrument on board USA’s TERRA satellite. The multispectral imaging sensor is the world’s first “geoscience tuned” satellite Earth Observing System. The ASTER geoscience maps of Australia represent the first continent-scale maps of the Earth’s surface mineralogy.
ASTER has 14 spectral bands spanning wavelengths sensitive to important rock forming minerals, including: Iron oxides; clays; carbonates; quartz; muscovite and chlorite.
Each ASTER image covers a 60 by 60 km area with individual pixel elements ranging from 15 to 90 m suitable for geoscience mapping from continent (1:2,500,000) down to mineral prospect (1:50,000) scale. The Australian mosaic is sourced from ~35,000 ASTER scenes with approximately 3500 used in the final mosaic.
The products are: False colour; CSIRO Landsat TM Regolith Ratios; Green vegetation content; Ferric oxide content; Ferric oxide composition; Ferrous iron index; Opaque index; AIOH group content; AIOH group composition; Kaolin group index; FeOH group content; MgOH group content; MgOH group composition; Ferrous iron content in MgOH/carbonate; Silica Index; Quartz Index; Gypsum Index.
COE - 3D Mineral Mapping - Mineral Mapping - Published 06 Mar 2020
Opening up greenfields regions for minerals exploration programs is best facilitated through the understanding of regional minerals prospectivity. The Capricorn Orogen is a greenfields region, in whic... moreh a multicommodity mineral systems analysis has been completed forming the basis of prospectivity analyses and mapping data included in this collection. Known mineral occurrences or deposits in the region formed from between the Paleoproterozoic and Neoproterozoic. Mineralisation can in related to basin development and orogenesis in the region, related to periods of supercontinent assembly and breakup that were manifested in the region through the contractional 2005 – 1950 Ma Glenburgh, 1830 –1780 Ma Capricorn, and c. 900 Ma Edmundian orogenies. These periods were preceded, and interspersed with periods of extension that may have included the 1680–1620 Mangaroon Orogeny, and led to the development of volcanosedimentary and sedimentary basins throughout the region. Prospectivity models were generated for several commodity groups of various ages and ore genesis mechanisms within the region that include combinations of Ni, Cu, PGEs, V, Ti, Au, Pb, Zn, channel Fe and U. The work has found a link between key mineral systems and a spatial relationship between disparate styles of mineral deposits in the region. Crustal-scale tectonic architecture was analysed by allying a 2D map view geological-geophysical interpretation with 2.5D magnetic and gravity joint inversions of selected profiles, a 3D Moho gravity inversion (MoGGIE), and inferences derived from 2D and 3D magnetotellurics and 2D reflection seismic and 3D passive seismic experiment conducted in the region. This work clearly illustrates different ‘zones’ of the Capricorn Orogen are prospective for diverse commodity groups due to the tectonic environment in which they developed through time. Major crustal-scale faults or shear zones that intrinsically control the location of known ore deposits in the area, are implied to be sites of fluid migration and proximal to sites of ore deposition. Of these, some are considered to be Archean in their origin, whereas others are thought to have developed during the early Paleoproterozoic and been re-activated through time, influence the formation of basins over them and perhaps the formation of ore deposits.less
SIEF Distal Footprints - Mineral Systems Analysis - Published 02 Aug 2019