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A multi-disciplinary approach to active fault rupture risk characterization: 3D geological modelling of the Willunga fault, Mt Bold Dam, South Australia
Published in Jean-Pierre Tournier, Tony Bennett, Johanne Bibeau, Sustainable and Safe Dams Around the World, 2019
S.R. Macklin, Z. Terzic, J.F. Barter, P. Buchanan, M. Quigley
The dam and reservoir are located within deformed rocks of the Burra Group, comprising a sequence of Late Precambrian interbedded siltstone, sandstone, chert and dolomite, including the Stoneyfell quartzite, Woolshed Flat Shale and Skilogallee dolomite formations, now metamorphosed to low grade meta-psammites, meta-pelites (“phyllite”) and marble. The rocks have been deformed by mountain building processes dating mainly to the “Delamerian Orogeny”, an E-W phase of compressive tectonics that occurred from the Cambrian to the Ordovician Period whilst Australia was still a part of the Gondwana supercontinent. This has resulted in a predominantly NE-SW striking structural “grain” to the Adelaide region, which includes multi-phase folding, foliation and cleavage, as well as large scale reverse/thrust faults.
South Australian geology and the State Heritage Register: an example of geoconservation of the Naracoorte Caves complex and karst environment
Published in Australian Journal of Earth Sciences, 2019
South Australia (SA) has had a strong tradition of geology and mining from the 1840s, commencing with the Burra and Moonta copper mines, now both National Heritage Places (Commonwealth of Australia Gazette—Government notices, 2017). This tradition established the SA School of Mines and a notable Geology Department at the University of Adelaide with several eminent staff. Later, several fossil reserves were created by the mid-twentieth century. In 1944, graduates and academic staff formed the SA Division of the Geological Society of Australia [GSA (SA)], and its Geoheritage Subcommittee (GHSC) was formed in 1966 followed by a GSA (SA) Field Guides Subcommittee. Using National Estate Grants from 1977–2000 until that funding source ceased (Hiern & Cowley, 2008), the GHSC assessed, nominated and listed more than 400 ‘Geological Heritage Sites’, previously known in SA as ‘Geological Monuments’. One of these was the Naracoorte Caves (Scales, 2008). All such sites were originally recorded on a CD set and are now included on the South Australian Resources Information Gateway (https://map.sarig.sa.gov.au/). The first eight Parts were listed by accumulation and Parts 9 and 10 utilised a merit-points approach devised by the late G. Kreig (Hiern & Krieg, 2012). Much credit is due for this work conducted by a small voluntary committee over many years. A number of these sites have been successfully submitted for listing on the SA State Heritage Register.