1887

Abstract

The Damara Belt, (Namibia) and the Lufilian Arc/Katangan Belt, (Zambia) formed during the Pan-African orogeny (ca. 800 – 500 Ma) as a result of the collision of the composite Kalahari Craton, to the south, and the composite Congo Craton, to the north. Their connection is highly speculative due to Kalahari and Karoo cover and their extent holds both academic importance and economic interests as the Damara Belt is rich in Uranium (U) and the Lufilian Arc in Copper-cobalt (Cu-Co) mineralisation. Due to limited outcrops on the border of Namibia and Botswana, geophysical techniques have become the main approach in constraining the possible extent of these belts. This study involves the interpretation of aeromagnetic and gravity datasets supplied by Rio Tinto complemented by regional-scale magnetotelluric (MT) data from the South African MagneTotelluric Experiment (SAMTEX) project. Three 400 km long potential field profiles are being modelled in Oasis Montaj using GM-SYS. These profiles intend to show the folding style of the Ghanzi-Chobe Belt, extent of the Matchless Amphibolite Belt (MAB) and contribute to the understanding of the strong remanent negative feature seen in northern Namibia. Potential field data as well as complementary MT data from SAMTEX were used, augmented by recent MT data acquired as part of the NSF Incipient Rifting project. Three roughly N-S MT profiles were analysed and modelled; DMB, NEN, OKA-CAM, listed west to east. The geoelectric strike analysis of the MT data shows different strike results for the upper 5 km of the crust compared to the strike results for 5 – 15 km of the crust. The strike angle increases from approximately 47° in the west to 85° in the east. These data will contribute to a better understanding of the tectonic evolution of these mobile belts and cratons by their incorporation into an interpretative sub-Kalahari geological map of the Kalahari Desert area.

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/content/papers/10.3997/2214-4609-pdb.378.SAGA2013_POSTER_Rankin
2013-10-06
2021-11-29
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http://instance.metastore.ingenta.com/content/papers/10.3997/2214-4609-pdb.378.SAGA2013_POSTER_Rankin
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