locations throughout Bimbowrie indicate at least two stages of mid Tertiary/Quaternary uplift. A rough correlation of erosional surfaces across the MacDonald Corridor indicates the MacDonald Fault has not been reactivated during this uplift.
Mineral exploration significance
The results of the regolith landform mapping and characterisation project within Bimbowrie are relevant to mineral exploration in the following ways:
x The regolith–landform map provides an understanding of the potential for widespread dispersion and residence of lithic fragments with mineralised signatures from bedrock highs. Figure 6 %LRJHRFKHPLFDO VDPSOLQJ RI EODFN EOXHEXVK Bimbowrie Station. (Photo 404916) There is also evidence that Eremophila may be a useful sampling media with potential for targeting Au, Cu, V, and Ni (Lintern et al., 1997). Further detailed sampling is needed to determine the biogeochemical variation within Eremophila species. x The map provides a regional overview of the regolith materials and landforms of the station, and can be used in the planning and interpretation of regional geochemical and biogeochemical exploration programs.
Some of the key components of the weathering and landscape evolution of the area include:
x a Late Cretaceous landscape with relatively high relief
x The information collected during mapping can be used to produce derivative maps highlighting the distribution of potential geochemical and biogeochemical sampling media to assist exploration.
x extensive weathering and erosion during the latest Cretaceous to early Tertiary, with weathering products deposited in the Murray Basin to the south and the Callabonna Sub-basin to the north
x continuing uplift and erosion during the Tertiary and Quaternary
x post-settlement increase in erosion rates, with incision and gullying of alluvial and colluvial sediments due to reduced vegetation cover (Fanning, 1999).
The presence of stepped erosional surfaces cutting across slightly weathered bedrock exposures at a number of
The information provides a framework for future landscape evolution studies, such as the investigating the ages and elevations of erosional surfaces observed throughout Bimbowrie. Further landscape evolution studies would improve the understanding of the timing and nature of neo-tectonism within the Olary Spur, and its relationship to uplift in the Flinders Ranges to the west and Barrier Ranges to the east. This information would assist in improving the understanding of palaeogeochemical dispersion vectors and palaeochannel formation and activity, and thus be relevant to uranium, diamond, gold and mineral sands exploration in the Curnamona Province and Murray Basin.
The author would like to thank Colin Conor of PIRSA, and Dr Steven Hill of the University of Adelaide for their assistance with this article.
Brown, A. and Hill, S., 2003. White Dam
detailed regolith-landform mapping as a
WRRO IRU UH¿QLQJ WKH LQWHUSUHWDWLRQ RI VXUIDFH geochemical results. MESA Journal, 31:6-8. Brown, A.D. and Hill, S.M. 2005. White Dam Au-Cu Prospect, Curnamona Province, South Australia. In: Butt, C.R.M., Robertson, I.D.M., Scott, K.M. and Cornelius, M. (Eds), Regolith expression of Australian ore systems. CRC LEME, Perth, pp. 392-394. Burtt, A.C., Conor, C.H.H., Preiss, W.V., Robertson, R.S. and Brown, A.D., 2005. Prospectivity analysis of Bimbowrie Station, Curnamona Province, South Australia
Interim Report. South Australia. Primary
Industries and Resources South Australia. Report Book, 2005/12. Conor, C.H.H., 2004. Geology of the Olary Domain, Curnamona Province, South Australia. South Australia. Department of Primary Industries and Resources. Report Book, 2004/8. Conor, C., Preiss, W. and Burtt, A. 2005. Bimbowrie Station — geological HQYLURQPHQWDO DQG KLVWRULFDO 6LJQL¿FDQFH MESA Journal, 39:6-9. Fanning, P., 1999. Recent landscape history in arid western New South Wales, Australia: a model for regional change. Geomorphology, 29:191-209. Hill, S.M. and Hill, L.J., 2003. Some important plant characteristics and assay overviews for biogeochemical surveys in Western New South Wales. In: Roach, I.C. (Ed.), Advances in regolith. CRC LEME, Perth, pp. 187-192. Hill, S.M., Thomas, M., Earl, K.L. and Foster, K.A., 2003. Regolith expressions of mineralisation within the Flying Doctor Prospect, Northern Leases, Broken Hill, New South Wales. In: Peljo, M. (Compiler), Broken Hill Exploration Initiative: Abstracts from the July 2003 Conference. Geoscience Australia. Record, 2003/13:81-82. Hulme, K. and Hill, S., 2005. Mineralisation discovery through transported cover using river red gums (Eucalyptus camaldulensis). Minerals Exploration Semina , 2005. Abstracts. CRC LEME, Perth, pp. 31-33. Lintern, M.J., Butt, C.R.M. and Scott, K.M., 1997. Gold in vegetation and soil – three FDVH VWXGLHV IURP WKH JROG¿HOGV RI VRXWKHUQ Western Australia. Journal of Geochemical Exploration, 58/1:1-14. Thomas, M., Earl, K.L., Hill, S.M. and Foster, K.A., 2002. A framework for regolith- landform mapping in the Flying Doctor Prospect, Broken Hill, NSW. In: Roach I.C. (Ed.), Regolith and landscapes of eastern Australia. CRC LEME, Perth, pp. 127-132.
For further information contact Aaron Brown, phone +61 8 8303 3904, email <aaron.brown@ adelaide.edu.au>.
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