The Tanami 3D model – incorporating the results of the 2005 Tanami Seismic Survey

Tony Meixner; Leon Vandenberg; Bruce Goleby; David Huston

doi:10.1071/ASEG2007ab091

ISSN: 2202-0586
E-ISSN:

oa The Tanami 3D model – incorporating the results of the 2005 Tanami Seismic Survey
Authors Tony Meixner^a, Leon Vandenberg^b, Bruce Goleby^c and David Huston^d
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^a Geoscience Australia, GPO Box 378 Canberra, ACT 2601, [email protected] ^b Northern Territory Geological Survey, PO Box 8760 Alice Springs, NT 0871, [email protected] ^c ANSIR c/- Geoscience Australia, GPO Box 378 Canberra, ACT 2601, [email protected] ^d Geoscience Australia, GPO Box 378 Canberra, ACT 2601, [email protected]
Publisher: Australian Society of Exploration Geophysicists
Source: ASEG Extended Abstracts, Volume 2007, Issue ASEG2007 - 19th Geophysical Conference, Dec 2007, p. 1 - 5
DOI: https://doi.org/10.1071/ASEG2007ab091
- Published online: 01 Dec 2007

Abstract

Summary

The Tanami 3D crustal-scale model integrates geological mapping with seismic interpretation and gravity modelling in order to enhance our understanding of the 3D architecture of the region.

The Tanami Region is a multiply deformed Palaeoproterozoic terrain consisting of the predominantly turbiditic Tanami Group, the volcanically derived sedimentary and extrusive rocks of the Ware Group and the Mount Charles Formation. Thought to be underlain by Archaean basement, the region was intruded by numerous granitoid bodies during the period 1820-1790 Ma and hosts the Callie world-class and several smaller gold deposits.

The 2005 Tanami seismic survey consisted of four regional traverses. Interpreted sections show the presence of a series of crustal-penetrating structures, that appear to be fundamental to the evolution of the Tanami Region. A number of these interpreted structures appear to link the mid-crust to ‘thin-skinned’ structures within the uppermost crust. The seismic also shows the presence of a southeast-dipping suture and associated pop-up structure, separating the Tanami crust from the Arunta crust. Known ore deposits are all located in close proximity to these interpreted through-going thrust faults and the associated ramp anticlines. Gravity modelling of the southeast-trending backbone seismic traverse (05GAT1) supports the seismic interpretation.

The current 3D model was constructed using 3D GeoModeller incorporating seismic data, modelled gravity, interpreted magnetic and gravity data and geological mapping. The 3D model forms the basis of the Tanami X3D web viewing tool, which allows the model and associated data to be viewed and manipulated over the web.

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References

Bagas, L., Huston, D.L., and Anderson, J., 2007, Gold deposits in the Palaeoproterozoic Tanami Group, Western Australia: Mineralium Deposita, v.42, 127-144.
Blake, D.H, Hodgson, I.M., and Muhling, P.C., 1979, Geology of The Granites-Tanami Region: Bureau of Mineral Resources, Australia, Bulletin 197.
Crispe A.J, Vandenberg, L.C., and Scrimgeour, I.R., 2007, Geological Framework of the Archaean and Palaeoproterozoic Tanami Region, Northern Teritory: Mineralium Deposita, v.42, 3-26.
Cross, A.J., and Crispe, A.J., 2007, SHRIMP U-Pb analyses of detrital zircon: A window to understanding the early Palaeoproterozoic development of the Tanami Basin, Northern Australia: Mineralium Deposita, v.42, 27-50.
Cross, A.J, Fletcher, I.R, Crispe, A.J, Huston, D.L., and Williams, N., 2005, New constraints on the timing of deposition and mineralisation in the Tanami Group: Northern Territory Geological Survey Record, 2005-001.
Hocking, R.M., 1994, Subdivisions of Western Australian Neoproterozoic and Phanerozoic sedimentary basins: Geological Survey of Western Australia, Record, 1994/4.
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Huston, H., Goleby, B., Vandenberg, L., Bagas, L., Jones, L., Korsch, R., Lyons, P., Johnston, W., Smith, T., Barton, T., and Johnstone, D., 2006, The Tanami Deep Seismic Reflection Experiment: a look under the surface of a major gold province in northern Australia: Australian Earth Sciences Conference, Extended Abstract.
Meissner, R., 1989. Rupture, creep, lamellae and crocodiles: happenings in the continental crust: Terra Nova, 1(1), 17-28.
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Vandenberg, L.C., and Meixner A.J., 2003, The Tanami 3D model: in Annual Geoscience Exploration Seminar (AGES): Abstracts: Northern Territory Geological Survey, Record, 2003-0001.

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Article Type: Research Article

Keyword(s): 3D model; gravity; seismic; Tanami

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