Depth contours derived from the NSW Basement Elevation Model.

All airborne geophysics has been reported to the NSW government and released under the requirements of the NSW Mining Act 1992. Contained within this vector file is the location of surveys and acquisition parameters.

This vector file contains the location of reprocessed surveys and their acquisition parameters. These reprocessed surveys are from airborne geophysical surveys that have been submitted to the NSW government by exploration and mining companies. They have been publicly released under the NSW Mining Act 1992.

The petrophysics dataset contains petrophysical (rock physical properties) data acquired by the Geological Survey of NSW. It stores measurements of samples and mapping sites collected under the Field Observations database, including from drillholes. It currently covers the following techniques: mass properties, electrical, radiometric, seismic rock physics, magnetic susceptibility and magnetic remanence. It contains raw readings and calculated results, from field and laboratory environments. Vector and tensor magnetic properties (remanence and anisotropic magnetic susceptibility (AMS)) are oriented to in-situ (geographic) and fold-corrected (stratigraphic) co-ordinates where sample and bedding orientation are known.

This layer shows a depth slice from a 3D resistivity model of the crust derived from an inversion of the AusLAMP NSW long period MT data.

In 2016, the Geological Survey of NSW (GSNSW) published a state-wide depth to basement 3D model (Robinson 2016, 2017). Since then, new geological and geophysical data have been released and used for the construction of basin-scale 3D geological models for the southern Thomson Orogen and the Sydney, Gunnedah and Bowen basins (Davidson 2019; Oliveira and Davidson 2019; Oliveira et al. 2019). The basement topography under these regions was modelled using constraints from drillholes, seismic, Seamless Geology, magnetics and gravity data. The results have now been incorporated into the updated Statewide 3D Basement Elevation Model reported herein.

The isotope geochemistry database contains geochronology and geological process data managed by the Geological Survey of NSW (GSNSW). Isotopic systems / techniques are U/Pb, K/Ar, Ar/Ar, Rb/Sr, Pb/Pb, Re/Os, Sm/Nd, Lu/Hf and stable sulfur, carbon, oxygen and hydrogen. The database stores location and sample collection information, lithological description, analytical and interpretation information for geological samples in New South Wales. The database includes links to stratigraphic unit, mineral occurrence and drill hole data. Some fields are controlled by look up tables.

EM-IP-MT survey data has been reported to the NSW government and released under the requirements of the NSW Mining Act 1992. Contained within this vector file is the location of surveys and acquisition parameters.

Total heat flow at surface model (2023) created by Geognostics with support from government and industry. This model is the sum of all heat-flow contributions (mantle heat flow, lower crustal heat flow, upper crustal radiogenic heat flow and sedimentary heat flow). This is modelled using a bottom up approach starting from the mantle and calculating upwards: Qtotal = Qmantle + Qlowercrust + Qupper crust + QSediments Basement composition and terranes dominate total heat flow, especially where sediment cover is thin. Where sediments are thick then these sediments mute the basement signatures. The total heat flow patterns closely follow upper crustal radiogenic heat production.

Greyscale image of second vertical derivative (2VD) of total magnetic intensity reduced to the pole (TMI RTP). Darker tones indicate lower values and lighter tones represent higher values. Reduction to the pole filters magnetic anomalies to appear as if the Earth's magnetic field were locally vertical, as at the magnetic pole (assuming all magnetic sources are inductively magnetised). The 2VD filter shows the vertical rate of change in the first vertical derivative (1VD) of the Earth's total magnetic field and enhances boundaries and structural detail of shallow sources further than 1VD. The 2VD filter enhances magnetic textures in the image, however, it also amplifies non-geological noise. Variations in the magnetic field are caused by lithological factors, principally magnetite (and/or pyrrhotite) content. This Statewide image was generated by merging many individual airborne magnetic surveys.