Regional geology 2015 - Southern Thomson Orogen

This data set is an interpretation of the southern Thomson Orogen basement geology with sedimentary cover basins (e.g. Adavale, Cooper, Eromanga) and regolith removed. Interpretation of the composition of rock units and the location and types structures has drawn upon several data sets of differing distribution and quality. The most extensively used data sets were enhanced magnetic images which reveal significant geological complexity in areas of shallow basement (i.e. depths from 50 – 400 m), with many domains of distinctive magnetic character recognised, including areas of extensive metamorphic rocks, intrusive plutons, and major structures. Gravity was used as filters and transparencies on magnetics images, helping to define large-scale structures and geological units in areas of deeper cover, though the density variations evident may be sourced at depths of several kilometres within the crust. This data set is seamless and has been produced in conjunction with an interpretation of basement geology in the southern Thomson Orogen region of northwest New South Wales. The package includes a separate feature class for lines and polygons named STO_GEO_STRUCTURE_250K_2015 and STO_GEO_SOLID_250K_2015 respectively.