Description: Interpreted extents of five Large Igneous Provinces (LIP) in Australia: Marnda Moorn, Warakurna, Gairdner, Kalkarindji and Hart LIPs. Where the interpreted extent of one LIP overlaps with that of another LIP the polygon is given a higher value.
Description: Mafic-ultramafic units identified as being part of the five Proterozoic Large Igneous Provinces (LIPs): Marnda Moorn, Warakurna, Gairdner, Kalkarindji and Hart. The mafic-ultramafic units are symbolised as polygons, points and lines.
Description: Minimum thickness of mafic material within the crust estimated by calculation of the cumulative thickness of material with P-wave velocity (Vp) values greater than 7.1 km/s above the Moho, using the Australian Seismological Reference Model (AuSREM) – Crustal Component.
Description: Normalised average horizontal gradient of the shear-wave velocity (Vsv) in the lithospheric mantle, as a raster with a continuum of values from 0 to 1. The stronger horizontal gradients in Vsv are emphasised, more likely to represent steeper and more vertically-extensive boundaries between lithospheric blocks.
Description: Major crustal-scale breaks interpreted from deep seismic reflection
and other geophysical and geological data. The lines marking the interpreted crustal breaks are assigned confidence values of low, moderate and high, and arbitrarily buffered to 50 km.
Description: Major crustal domain boundaries interpreted from neodymium isotope (two-stage depleted mantle) model age data. The lines marking the interpreted crustal breaks are assigned confidence values of medium and high, and arbitrarily buffered to 50 km.
Description: Geological units and events containing analyses from the OZCHEM National Whole Rock Geochemistry Dataset, Geoscience Australia, with MgO ≥ 12%.
Description: Mafic rocks classified as tholeiitic based on chemical analyses within the OZCHEM Whole-rock Geochemistry Dataset. Geochemical point data with
tholeiitic compositions have been extrapolated to geological units and events using the Australian Mafic-Ultramafic Magmatic Events dataset. Areas coloured blue were weighted ‘low’ because tholeiitic units are subordinate to other rock types in these magmatic units and events. Areas coloured orange represent magmatic units and events contained tholeiitic extrusive rocks as the dominant rock types. The units and events with highest weighting, coloured red, are where the dominant rock types are tholeiitic mafic intrusive rocks.
Description: Geological units and events for which there are analyses in the OZCHEM National Whole Rock Geochemistry Dataset with MgO vs Ni values at and above the 95th percentile, and weighted according to the dominant presence (or otherwise) of mafic intrusives.
Description: Geological units and events for which there are analyses in the OZCHEM National Whole Rock Geochemistry Dataset with Cu values ≥ 180 ppm (90th percentile and above), and weighted according to the dominant presence (or otherwise) of mafic intrusives.
Description: Geological units and events for which there are analyses in the OZCHEM National Whole Rock Geochemistry Dataset with Pt values ≥ 10 ppb or Pd values ≥ 10 ppb, and weighted according to the dominant presence (or otherwise) of mafic intrusives.
Description: Geological units and events for which there are analyses in the OZCHEM National Whole Rock Geochemistry Dataset with MgO vs Ni values at or below the 5th percentile, and weighted according to the dominant presence (or otherwise) of mafic intrusives.
Description: Geological units and events for which there are analyses in the OZCHEM National Whole Rock Geochemistry Dataset with Cu values ≤ 10 ppm, and weighted according to the dominant presence (or otherwise) of mafic intrusives.
Description: Geological units and events for which there are analyses in the OZCHEM National Whole Rock Geochemistry Dataset with Pt values ≤ 1 ppb OR Pd values ≤ 1 ppb, and weighted according to the dominant presence (or otherwise) of mafic intrusives.
Description: Geological units and events for which there are analyses in the OZCHEM National Whole Rock Geochemistry Dataset with elevated sulfur (≥ 1540 ppm, ≥ 75th percentile), and weighted according to the dominant presence (or otherwise) of mafic intrusives.
Description: Values of Principal Component 3 (PC3) derived from surface geochemical data of the National Geochemical Survey of Australia. Positive values of PC3, scale from ‘low’ to ‘high’, are dominated by the effects of elevated Cr, Sc, V, Ti, Co, and Ni. The PC3 values for the individual sample sites have been used to attribute the corresponding river catchments, which are shown as the coloured polygons in the Figure. Note values shown as ‘low’ include areas of no data (mainly in northern Western Australia and western South Australia) as well as catchments with negative PC3 values.
Description: All mineral occurrences (not deposits) with the commodity ID: Ni and/or Pt and/or Pd and/or Os and/or Ir and/or PGE as the first listed commodity were selected from Geoscience Australia’s mineraloccurrences (MINLOC) database. Point locations buffered with an arbitrary radius of 1.5 km.
Description: Map showing the potential for tholeiitic intrusion-hosted Ni-Cu-PGE sulfide deposits in Australia. This map is a synthesis of the four component layers; energy sources; lithospheric architecture; sources of ore metals, and; ore depositional gradients, using a weighted sum (equal weight) to produce the final prospectivity map of tholeiitic intrusion-hosted Ni-Cu-PGE deposits.
Description: Energy sources component of the final prospectivity map of tholeiitic intrusion-hosted Ni-Cu-PGE deposits. This layer is a combination of the following input layers; Overlapping Large Igneous Provinces; Mafic-ultramafic units within Large Igneous Provinces; and AuSREM seismic tomography: Vsv >7.1 km/s above the Moho. The three layers were combined into one layer using a weighted sum (feature weight).
Description: Lithospheric architecture component of the final prospectivity map of tholeiitic intrusion-hosted Ni-Cu-PGE deposits. This layer is a combination of the following layers; AuSREM seismic tomography: horizontal gradients in Vsv; Major Crustal Boundaries; and Neodymium Isotopic Domain Boundaries. The three layers were combined into one layer using a weighted sum (feature weight).
Description: Sources of ore metals component of the final prospectivity map of tholeiitic intrusion-hosted Ni-Cu-PGE deposits. This layer is a combination of input layers; Ultramafic or ultramafic-mafic rocks; Mafic-ultramafic rocks; MgO ≥ 12%; Tholeiitic units and events; High Ni abundances; High Cu abundances; and High PGE abundances. A weighted sum (feature weight) calculation was performed on the input layers. The resulting layers were then added using a weighted sum (equal weight) calculation to give the output raster.
Description: Ore depositional gradients component of the final prospectivity map of tholeiitic intrusion-hosted Ni-Cu-PGE deposits. This layer is a combination of the following input layers; Ni depletions; Cu depletions; PGE depletions; Sulfur-saturated igneous rocks; National Geochemical Survey of Australia PC3 component; Nickel and PGE mineral occurrences; Bouger Anomoly Gravity Grid of Australia; and Total Magnetic Intensity (TMI) Grid of Australia. The input layers were combined to produce an output for the ore depositional gradients component. A weighted sum (feature weight) calculation was performed on the input layers for each theoretical criteria. The resulting layers were then added using a weighted sum (equal weight) calculation to give the output raster.