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Showing results for: [ Mineralogy and Crystallography ]
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 May 2017
This data pack contains sample information, geochemistry, mineralogy, and petrophysical data collected during CSIRO's Uncover Cloncurry project. This project examined mineral deposits in the Cloncurry... more District of NW Queensland.less
Cloncurry Mineral Systems - Uncover Cloncurry - Published 19 Oct 2016
Electron back-scatter diffraction data set collected on sample GQ1943_2 from Sunrise Dam Gold Mine. The sample contains fine-grained quartz and dolomite with areas of recrystallised veins. Data is pre... moresented as an ASCII text file in the CHANNEL5 text file (.ctf) format that contains match unit parameters, phase ID, Euler angle triplets that use the Z-X'-Z'' (Bunge) definition and pattern quality measure (BC). less
Legacy data - Geology of ore deposits - Published 02 Sep 2016
3D online images for the paper: Sulfide-silicate textures in magmatic Ni-Cu-PGE sulfide ore deposits. 1. Disseminated and net-textured ores.
by Stephen J. Barnes, James E. Mungall, Margaux Le Vaillant... more, Belinda Godel, C. Michael Lesher, David Holwell, Peter C. Lightfoot, Nadya Krivolutskaya, Bo Wei
OCE Science Leader - Stephen Barnes - Magmatic sulfide ore petrology - Published 30 May 2016
X3D online visualization of silicates and sulphides microstructure for the paper entitled: "3D textural evidence for the formation of ultra-high tenor precious metal bearing sulfide microdroplets in o... moreffset reefs: An extreme example from the Platinova Reef, Skaergaard Intrusion, Greenland".less
OCE Science Leader - Stephen Barnes - Magmatic sulfide ore petrology - Published 19 Apr 2016
EBSDinterp is a GUI-based Matlab program to perform microstructurally constrained interpolation of electron backscatter diffraction (EBSD) datasets. The dataset in this collection comprises ASCII Chan... morenel Text Files (.ctf) of the raw and processed datasets used in the publication describing EBSDinterp. The dataset contains EBSD data of a twinned plagioclase grain that has been deformed under greenschist facies conditions. Also included are the logfiles written out by EBSDinterp on completion of the data interpolation that describes the parameters used in the interpolation of the dataset.less
Gold Research - EBSD data processing and analysis - Published 26 Jun 2015
EBSDinterp is a GUI-based Matlab program to perform microstructurally constrained interpolation of electron backscatter diffraction (EBSD) datasets. The dataset in this collection comprises ASCII Cha... morennel Text Files (.ctf) of the raw and processed datasets used in the publication describing EBSDinterp. The dataset contains EBSD data of a large fractured albite aggregate filled with gold and pyrrhotite. This sample was collected from the Hamlet mine of the St Ives camp in Western Australia. Also included is the logfile written out by EBSDinterp on completion of the data interpolation that describes the parameters used in the interpolation of the dataset.less
Gold Research - EBSD data processing and analysis - Published 19 Jun 2015
EBSDinterp is a computer program to interpolate electron backscatter diffraction (EBSD) data using the underlying microstructure as a guide to avoid creating artefacts. It reads in binary .cpr files (... morefrom Oxford-HKL CHANNEL 5) or ASCII .ctf files. The user can alter a number of processing parameters that control the the extent to which intepolation is permitted via the number of indexed neighbours a pixel has and the quality of the original EBSD pattern (using the band contrast).
It is written in MATLAB 2012b and compiled using the MATLAB compiler runtime (MCR) 2012b version 7 for both 32 and 64-bit Windows machines. EBSDinterp can be run using single or multicore computing as it make use of the parallel processing toolbox in MATLAB.less
Chemical mapping (energy dispersive x-ray spectroscopy) data of replacement microstructures in carbonates from the Junction gold deposit near Kambalda in the Yilgarn Craton, Western Australia. Maps sh... moreow relationships between phases as calcite is replaced by dolomite and siderite. Included are the Bruker composite files that contain spectra for each point on the map, images of chemical maps for individual elements and composite RGB maps showing Mg, Fe, and Ca respectively. For composite images, chemistry is overlain on back scattered electron images to give the image the resolution of the BSE image but chemical data from the x-ray spectra.less
Gold Research - Imaging of chemical variations during replacement reactions - Published 16 May 2013
Images of replacement microstructures in carbonates from the Junction gold deposit near Kambalda in the Yilgarn Craton, Western Australia. Images show relationships between phases as calcite is replac... moreed by dolomite and siderite. Included are the raw images as well as a full sized stitched version, a reduced resolution stitched image and a contrast adjusted image that shows variations in the back scattered electron response of both the siderite, and dolomite and calcite.
Electron back scatter diffraction data of carbonates from the Junction gold deposit near Kambalda in the Yilgarn Craton, Western Australia. Maps show relationships between phases as calcite is replace... mored by dolomite and siderite. Collection contains .ctf (Channel Text Files) which are ASCII files with phase and orientation data as euler angles. Note that dolomite is indexed using the calcite match unit due to problems with systematic misindexing of dolomite.
Two files are included for each map with suffixes 'Raw' and 'Processed' to indicate the as collected and final published data respectively. less
Gold Research - Electron Back Scatter Diffraction Analysis of Carbonate Replacement Microstructures - Published 16 May 2013
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 18 Mar 2013