Lithospheric structures and Precambrian terrane boundaries in northeastern Botswana revealed through magnetotelluric profiling as part of the Southern African Magnetotelluric Experiment


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dc.contributor.author Miensopust, Marion P.
dc.contributor.author Jones, Alan G.
dc.contributor.author Muller, Mark R.
dc.contributor.author Garcia, Xavier
dc.contributor.author Evans, Rob L.
dc.date.accessioned 2011-03-25T15:34:23Z
dc.date.available 2011-08-03T08:26:11Z
dc.date.issued 2011-02-03
dc.identifier.citation Journal of Geophysical Research 116 (2011): B02401 en_US
dc.identifier.uri http://hdl.handle.net/1912/4420
dc.description Author Posting. © American Geophysical Union, 2011. This article is posted here by permission of American Geophysical Union for personal use, not for redistribution. The definitive version was published in Journal of Geophysical Research 116 (2011): B02401, doi:10.1029/2010JB007740. en_US
dc.description.abstract Within the framework of the Southern African Magnetotelluric Experiment a focused study was undertaken to gain improved knowledge of the lithospheric geometries and structures of the westerly extension of the Zimbabwe craton (ZIM) into Botswana, with the overarching aim of increasing our understanding of southern African tectonics. The area of interest is located in northeastern Botswana, where Kalahari sands cover most of the geological terranes and very little is known about lithospheric structures and thicknesses. Some of the regional-scale terrane boundary locations, defined based on potential field data, are not sufficiently accurate for local-scale studies. Investigation of the NNW-SSE orientated, 600 km long ZIM line profile crossing the Zimbabwe craton, Magondi mobile belt, and Ghanzi-Chobe belt showed that the Zimbabwe craton is characterized by thick (∼220 km) resistive lithosphere, consistent with geochemical and geothermal estimates from kimberlite samples of the nearby Orapa and Letlhakane pipes (∼175 km west of the profile). The lithospheric mantle of the Ghanzi-Chobe belt is resistive, but its lithosphere is only about 180 km thick. At crustal depths a northward dipping boundary between the Ghanzi-Chobe and the Magondi belts is identified, and two middle to lower crustal conductors are discovered in the Magondi belt. The crustal terrane boundary between the Magondi and Ghanzi-Chobe belts is found to be located further to the north, and the southwestern boundary of the Zimbabwe craton might be further to the west, than previously inferred from the regional potential field data. en_US
dc.description.sponsorship In addition to the funding and logistical support provided by SAMTEX consortium members (Council for Geoscience, Geological Surveys Botswana and Namibia, De Beers Group Services, Rio Tinto Exploration, and BHP Billiton), this work was also supported by research grants from National Science Foundation’s Continental Dynamics program (USA, EAR‐0309584 and EAR‐0455242), the Department of Science and Technology (South Africa), and Science Foundation Ireland (Ireland, grant 05/RFP/GEO001). en_US
dc.format.mimetype application/pdf
dc.language.iso en_US en_US
dc.publisher American Geophysical Union en_US
dc.relation.uri http://dx.doi.org/10.1029/2010JB007740
dc.subject Magnetotellurics en_US
dc.subject Zimbabwe craton en_US
dc.subject Lithospheric structures en_US
dc.subject Southern Africa en_US
dc.title Lithospheric structures and Precambrian terrane boundaries in northeastern Botswana revealed through magnetotelluric profiling as part of the Southern African Magnetotelluric Experiment en_US
dc.type Article en_US
dc.identifier.doi 10.1029/2010JB007740

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