Syn-Bushveld "granite sheets" associated with the Molopo Farms Complex intruding into Transvaal Supergroup strata in southern Botswana
Date
2023
Authors
Mapeo, R.B.M.
Key, R.M.
Moore, A.E.
Mulder, J.A.
Gardiner, N.J.
Robb, L.J.
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Journal article
Citation
South African Journal of Geology, 2023; 126(2):161-176
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R.B.M. Mapeo, R.M. Key and A.E. Moore, J.A. Mulder, N.J. Gardiner, L.J. Robb
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Abstract
LA-ICPMS U-Pb isotope analyses are presented for zircons from a thin granite sheet intersected in a borehole drilled into the upper Transvaal Supergroup wall rocks to the Molopo Farms Complex in southern Botswana. Many of the zircons have irregular or angular grain margins, and some have rounded cores. Approximately half of the analysed grains yielded concordant 207Pb/206Pb ages ranging between 2 282 ± 29 and 2 113 ± 16 Ma. Assuming that these grains were inherited from the surrounding upper Transvaal Supergroup sedimentary strata, the youngest zircon age provides a maximum depositional age for these sediments. Importantly, these zircon ages coincide with dates from detrital zircons in upper Transvaal Supergroup strata in the eastern Kaapvaal Craton and in the Magondi Supergroup in western Zimbabwe. Hf isotope analyses of the rounded zircons suggest that these grains were sourced from a variable mixture of an old basement and more juvenile material. A younger age of 2 060 ± 12 Ma was obtained from a single subhedral zircon grain from the granite sheet. This is interpreted as the granite’s emplacement age, making it coeval with the adjacent Molopo Farms Complex that forms part of the Bushveld Large Igneous Province.
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Corrected by: This article is a correction to: Syn-Bushveld “granite sheets” associated with the Molopo Farms Complex intruding into Transvaal Supergroup strata in southern Botswana, South African Journal of Geology (2023) 126 (3): 337–338. https://doi.org/10.25131/sajg.126.0019. In the original article, there was a mistake in Table 3 “U-Pb ages (Ma) and Hf isotopic data of zircons from the Molopo Granite Sample MF-41 from the Molopo Farms Region, southern Botswana” as published. The authors pasted duplicate data in Table 3, which caused the data to be duplicated and included minor type-setting issues. The corrected Table 3 “U-Pb ages (Ma) and Hf isotopic data of zircons from the Molopo Granite Sample MF-41 from the Molopo Farms Region, southern Botswana” appears overleaf. The authors apologise for this error and state that it does not change the scientific conclusions of the article in any way. By this corrigendum, we wish to update the original article.
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© 2023 Geological Society of South Africa. All rights reserved.