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3D geometry of the Xade Complex inferred from gravity and magnetic data

Pouliquen, G.; Key, R.. 2007 3D geometry of the Xade Complex inferred from gravity and magnetic data. In: Exploration 07: exploration in the new Millennium : proceedings of the Fifth Decennial International Conference on Mineral Exploration, Toronto, Canada, 9-12 September 2007. Toronto, Canada, Decennial Mineral Exploration Conferences, 1043-1047.

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Abstract/Summary

The Xade Complex is an unexposed Y-shaped body, approximately 100 km long and 25km wide, located close to the western margin of the Kaapvaal craton in Botswana. The complex is characterized by large coincident magnetic and gravity anomalies. It is completely covered by varying thicknesses of Kalahari sediments as well as by Karoo strata, which means that detailed analysis of high resolution airborne magnetic data, ground gravity data and limited seismic data are essential in interpreting the internal configuration of the complex. An earlier interpretation of the first airborne magnetic survey of Botswana (Reeves, 1978) coupled with subsequent drilling discovered the Xade Complex and showed that it is made up of mafic and ultramafic rocks. However, the limited amount of drilling did not provide sufficient information to either interpret in detail its internal geology or its regional geotectonic setting (Meixner and Peart, 1984). New 2D and 3D gravity and magnetic modelling have constrained the geometry of the complex as a syncline defined by folded mafic lavas and high-level sub-volcanic mafic sheets. The Xade Complex lies within a graben that forms the N-S arm of a triple junction with the faulted western margin of the Kaapvaal Craton. The focal point of the triple junction coincides with an inflection of the cratonic margin and is the likely site of the feeder zone to the mafic lavas of the Xade Complex. The Tsetseng Complex is shown to be an internally layered, magnetite-bearing gabbro.

Item Type: Publication - Conference Item (Paper)
Programmes: BGS Programmes > Seismology and Geomagnetism
Additional Keywords: Botswana, Gravity, Magnetic anomalies
NORA Subject Terms: Earth Sciences
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Date made live: 21 Apr 2009 13:15
URI: http://nora.nerc.ac.uk/id/eprint/4134

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