Neoarchaean and Palaeoproterozoic tectono-metamorphic events along the southern margin of the Zimbabwe craton: Insights from muscovite 40Ar/39Ar geochronology from rare-metal pegmatites, Zimbabwe

Journal article


Chagondah, G. S., Kramers, J. D., Hofmann, A. and Rollinson, H. 2024. Neoarchaean and Palaeoproterozoic tectono-metamorphic events along the southern margin of the Zimbabwe craton: Insights from muscovite 40Ar/39Ar geochronology from rare-metal pegmatites, Zimbabwe. Journal of African Earth Sciences . 217, pp. 1-12.
AuthorsChagondah, G. S., Kramers, J. D., Hofmann, A. and Rollinson, H.
Abstract

Muscovite 40Ar/39Ar geochronology on ten samples from complex-type, rare-metal (e.g., Li, Cs, Ta, Rb, Be, Nb, Sn and W) pegmatites from the Bikita and Mweza pegmatite fields in Zimbabwe yield ages that range from ca. 2622–1940 Ma. One pegmatite from the Bikita field yield a relict age of ca. 2622 Ma which is similar to the ca. 2.62 Ga emplacement age of the Main Bikita Pegmatite previously determined by laser ablation analyses of Ta–Nb–Sn oxides. Younger muscovite 40Ar/39Ar ages of ca. 2580–2539 Ma in the Bikita field may reflect post-pegmatite emplacement tectono-thermal events under fluid-mediated conditions. Data from the Mweza pegmatite district yield dates of ca. 2027–1940 Ma which reflect a Palaeoproterozoic overprint. Palaeoproterozoic 40Ar/39Ar ages are spatially restricted to near the Northern Marginal Zone–Zimbabwe Craton boundary and are absent towards the interior of the craton in the Bikita pegmatite field.

KeywordsTectono-metamorphic events; Muscovite; Neoarchaean; Palaeoproterozoic; Bikita; Mweza ; Rare-metal pegmatites; Zimbabwe Craton; Argon geochronology
Year2024
JournalJournal of African Earth Sciences
Journal citation217, pp. 1-12
PublisherElsevier
ISSN1879-1956
Web address (URL)https://www.sciencedirect.com/science/article/abs/pii/S1464343X24001663?casa_token=X8frD2lyV4YAAAAA:p4wA8RYPV6RUR8r-0QcLXXF1zwF354_8pppqVQlGuHi_VKt6HNO5lpLwQpvbp5SAHA1v1JAmbg
Output statusPublished
Publication dates
Online05 Jul 2024
Publication process dates
Accepted03 Jul 2024
Deposited16 Aug 2024
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