Airborne Gravity 2010 - Geoscience Australia

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Airborne Gravity 2010 basin. Both sub-basins seem to contain fill with a thickness in excess of 6 km. Furthermore, three localised basement highs within the basin appear to correspond with interpreted granitoid intrusions, the largest of which separates the two sub-basins mentioned above. Figure 6. Three dimensional depth to basement surface of the Volta Basin, Ghana; view is from the southeast. Inset: Basement geology of the Volta Basin. In order to better understand the 3-D distribution of the basement lithologies, a further modelling exercise was undertaken using the GeoModeller software package from Intrepid Geophysics. The results were very similar to those obtained previously, however, the GeoModeller software allowed each geological unit to be rendered as a 3-D volume (Figure 7) providing a more visually realistic interpretation. Conclusions Over the last six years, significant advances have been made in airborne gravity and gravity gradiometry. Improvements in instrument control and data processing have reduced noise levels and improved accuracy in both GT-1A gravimetry and FALCON gravity gradiometry. The bandwidth of the FALCON gravity can be extended to very long wavelengths by conforming to regional gravity. Parallel improvements in 3D inversions and visualisation have made it easier to relate the gravity data to geology, clearly demonstrating the value that airborne gravity can bring to an exploration project. New technology in the digital FALCON AGG has led to the ability to fly HeliFALCON surveys with consequent improvements in both sensitivity and spatial resolution. Successful joint heli-borne gravity, magnetic and electromagnetic surveys have been flown and an airborne test has demonstrated this same capability from a fixed-wing platform. FALCON AGG surveys have been flown in helicopter, single engine and twin-engine aircraft. 55
Airborne Gravity 2010 Figure 7. GeoModeller inversion results showing elements of the Volta Basin in 3-D, with certain lithologies removed, viewed from the southwest. The Sefwi Belt (green) and Kibi-Winneba Belt (yellow) can be seen in the foreground, while intrabasin granitoids can be seen in the middle and back. References Ameglio, L., 2005, New Fugro Airborne Gravity System – Survey Test over the Vredeford Structure (South Africa): extended abstract, 67th EAGE Conference & Exhibition, Madrid, http://www.earthdoc.org/detail.php?pubid=1005, accessed 13 August 2010. Boggs, D. B., Lee, J. B., van Leeuwen, E., Maddever, R. A. M., Turner, R. J., Downey, M. A., Liu, G., and McCracken, K., 2005, The BHP-Billiton Digital Gravity Gradiometer: Preview, 117, 21–22. Boggs, D. B., and Dransfield, M. H., 2004, Analysis of errors in gravity derived from the FALCON airborne gravity gradiometer: In: Lane, R. J. L. (editor), Airborne Gravity 2004 - Abstracts from the ASEG-PESA Airborne Gravity 2004 Workshop, Geoscience Australia Record 2004/18, 135- 141. Boggs, D. B., Maddever, R. A. M., Lee, J. B., Turner, R. J., Downey, M. A., and Dransfield, M. H., 2007, First test survey results from the FALCON helicopter-borne airborne gravity gradiometer system: Preview, 126, 26–28. Dransfield, M. H., 2007, Airborne Gravity Gradiometry in the Search for Mineral Deposits: In Milkereit, B. (Ed.) Proceedings of Exploration 07: Fifth Decennial International Conference on Mineral Exploration, 341-354. Dransfield, M. H., 2010, Conforming FALCON gravity and the global gravity anomaly: Geophysical Prospecting, 58, 469-483. Dransfield, M. H., and Lee, J. B., 2004, The FALCON airborne gravity gradiometer survey systems: In: Lane, R. J. L. (editor), Airborne Gravity 2004 - Abstracts from the ASEG-PESA Airborne Gravity 2004 Workshop, Geoscience Australia Record 2004/18, 15-19. Fernandez, M. L., Lyrio, J. C. S. O., Yalamanchili, S. V., Braga, L., and Morgan, A., 2009, Airborne gravity gradiometer, magnetic and seismic data integrated interpretation for basement configuration and prospect evaluation over Chirete area, Argentina: SEG Technical Program Expanded Abstracts, 28, 938-941. 56
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