Two pulses of Mesoproterozoic intra-plate magmatism in the heart of the Palaeoproterozoic Ubendian Domain of northern Malawi

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dc.contributor.authorThomas, Robert J.
dc.contributor.authorBoger, Steven D.
dc.contributor.authorFullgraf, Thomas
dc.date.accessioned2023-06-27T07:47:49Z
dc.date.available2023-06-27T07:47:49Z
dc.date.issued2023
dc.description.abstractTwo Mesoproterozoic anorogenic igneous events are recorded in the Palaeoproterozoic Ubendian Domain in northern Malawi. The oldest is represented by the Mwakikome orthogneiss, a small peraluminous, sub-alkaline and ferroan syenogranite that has a U–Pb zircon emplacement age of 1411 ± 3 Ma, an initial εNd of 􀀀 4.5 and a Nd TDM2 model age of 2.27 Ga. These data are interpreted to suggest that the Mwakikome intrusion was derived mainly from the melting of the adjacent Palaeoproterozoic country rocks during Kibaran-aged extension. The second anorogenic igneous event is defined by the more widespread Mwenga Suite, a series of small (<100 km2) NW-SE oriented and elongated plutons that occur in a narrow belt in the north of the Ubendian Domain. Seven samples from different intrusions gave U–Pb zircon emplacement ages between ~1150 and 1110 Ma. The Mwenga Suite is comprised of rocks that are also ferroan, potassic and sub-alkaline in composition and shows a range of major element compositions from monzogranite to alkali-feldspar granite. Nd isotopic data from one sample yielded an initial εNd of 􀀀 2.2 and a Nd TDM2 model age of 1.88 Ga, suggesting that the suite was also largely derived from melting of the Ubendian host rocks, but with some additions from an enriched mantle source.en_US
dc.identifier.citationThomas, R. J. et al. (2023). Two pulses of Mesoproterozoic intra-plate magmatism in the heart of the Palaeoproterozoic Ubendian Domain of northern Malawi. Journal of African Earth Sciences, 202, 04897. https://doi.org/10.1016/j.jafrearsci.2023.104897en_US
dc.identifier.issn1464-343X
dc.identifier.urihttps://doi.org/10.1016/j.jafrearsci.2023.104897
dc.identifier.urihttp://hdl.handle.net/10566/9160
dc.language.isoenen_US
dc.publisherElsevieren_US
dc.subjectMalawien_US
dc.subjectGeochemical dataen_US
dc.subjectGeoscienceen_US
dc.subjectMesoproterozoicen_US
dc.titleTwo pulses of Mesoproterozoic intra-plate magmatism in the heart of the Palaeoproterozoic Ubendian Domain of northern Malawien_US
dc.typeArticleen_US

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