Showing results for: [ Geology not elsewhere classified ]
The digital 3-dimenional (3D) mineral mapping suite of Queensland comprises ~20 “standardized” products at the spectral resolution of the ASTER (Advanced Space-borne Thermal Emission and Reflection Ra... morediometer) sensor and generated from publicly-available satellite, airborne, field and drill core spectral data spanning the visible near infrared (VNIR; 0.4 to 1.0 µm), shortwave infrared (SWIR; 1.0 to 2.5 µm) and thermal infrared (TIR; 7.5 to 12.0 µm) wavelength regions, including:
1. Satellite ASTER maps at both 30 m and 90 m pixel resolution with complete coverage of the state of Queensland, i.e. 1.853 million km²;
2. Airborne HyMap maps at ~5 m pixel resolution with a coverage of ~25,000 km2 from areas across north Queensland;
3. Field point samples (~300) from the National Geochemical Survey of Australia (NGSA) collected from a depth of 0-10 cm of flood overbank sediments;
4. Drill-core profiles (~20) of the National Virtual Core Library (NVCL) selected from the area around the Georgetown seismic line (07GA-IG2).
Key to the processing of the remote sensing data-sets (ASTER and HyMap) was the implementation of unmixing methods to remove the effects dry and green vegetation. This unmixing was not applied to the Australian ASTER geoscience maps released in 2012 (called here Version 1 or V1) resulting in extensive areas with little/no mineral information because of the need to apply masks. The vegetation unmixing methods used in the Version 2 (V2) processing of the ASTER and HyMap imagery has resulted in very few areas without coherent mineral information.
The resultant V2 “mineral group” products were designed to measure mineral information potentially useful for mapping: (i) primary rock composition; (ii) superimposed alteration effects; and (iii) regolith cover. These V2 products may assist in mapping soil properties and groundwater conditions. However their relatively low spectral resolution (based on ASTER’s 14 VNIR-SWIR-TIR bands) means that they do not provide the high level of mineralogical detail available from hyperspectral systems (>100 spectral bands), like HyMap and the HyLogger. Nevertheless, the relatively low spectral resolution of ASTER means that all other sensor data can be spectrally resampled to that resolution. Furthermore, the ASTER global data archive, which now spans entire Earth’s land surface <80degrees latitude, means that it can be used as global base-map for integrating all other spectral data.
3D Mineral Map of Queensland - Stage 1 - mineral mapping - Published 06 Dec 2019
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
Airborne electromagnetic surveys undertaken in the Musgraves Province in South Australia Queensland, Australia. The surveys were flown between the 18th August 2016 and 14th October 2016.
As ... morepart of the Goyder Institutes Facilitating Long-Term Outback Water Solutions Stage 3 (G-FLOWS 3) two airborne electromagnetic (AEM) surveys were flown to assist in a regional groundwater resources assessment in an otherwise data poor area.
For the AEM data acquisition, two different AEM surveys were planned with a relatively wide line spacing of 2km, wide enough to cover a large region, whilst being close enough to provide useful information about the variability of cover, including the location and geometry of the major palaeovalley systems known to be present in the area. Both surveys were flown with a line spacing of 2km in a north-south direction. The western survey was flown with the TEMPEST high moment (HM) system, and the eastern part with the SkyTEM312FAST system. Both systems are time domain AEM systems, one being of a fixed wing configuration (TEMPEST), the other being helicopter borne (SkyTEM). less
Goyder Finding Long-term Outback Water Solutions: Stage-3 (G-Flows Stage-3) - - Published 18 Jun 2019
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 27 May 2019
Derived hydrogeology dataset of the Eyre Peninsula region in South Australia
1212.3 Goyder 1.2.2 FLOWS 2 - Hydrogeology Framework Model - Published 21 Aug 2015
Chemistry analysis results of the sampled bores in the Musgrave province, South Australia
Goyder Flows Project - Chemistry analysis - Published 21 Mar 2014
Lab chemistry results of sampled bore locations in the Musgrave province, South Australia.
Goyder Flows Project - Chemistry analysis - Published 11 Aug 2013
Derived hydrogeology dataset of the Musgrave Block in South Australia.
Goyder Flows Project - Digitising - Published 10 Aug 2013
GFLOWS Summary of sampled bore data, taken in October 2012, in the Musgrave province, South Australia
Goyder Flows Project - Groundwater sample analysis - Published 02 Aug 2013