Reconnaissance SHRIMP U–Pb zircon geochronology of the Tanzania Craton: Evidence for Neoarchean granitoid–greenstone belts in the Central Tanzania Region and the Southern East African Orogen

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dc.contributor.authorKabete, J. M.
dc.contributor.authorMcNaughton, N. J.
dc.contributor.authorGroves, D. I.
dc.contributor.authorMruma, Abdulkarim H.
dc.date.accessioned2016-09-21T13:30:41Z
dc.date.available2016-09-21T13:30:41Z
dc.date.issued2012
dc.descriptionFull text can be accessed at http://www.sciencedirect.com/science/article/pii/S0301926812001696en_US
dc.description.abstractReconnaissance U–Pb sensitive high-resolution ion microprobe (SHRIMP) zircon dating of gneisses, granitoids and greenstones from well-documented study areas within the Tanzania Craton indicates that: (1) ∼2815–2691 Ma greenschist-amphibolite facies greenstones and associated granitoids are confined within extensive >3600 Ma granitoid–gneisses in the Central Tanzania Region; (2) greenschist-amphibolite facies greenstone rocks from the Singida-Mayamaya Terrane in the south-eastern Lake Nyanza Superterrane, Lake Victoria Region are older than 2681 Ma; (3) greenschist to lower-granulite facies granitoid–greenstone belts from the Kilindi-Handeni Superterrane, within the largely Neoproterozoic Southern East African Orogen are older than 2670 Ma; and (4) the granitoid–greenstone belts within the Dodoma Basement Superterrane, Central Tanzania Region and Kilindi-Handeni Superterrane, Southern East African Orogen are broadly coeval with ∼2823–2671 Ma granitoid–greenstone belts in the Lake Nyanza Superterrane, in the Lake Victoria Region. The basement to juvenile greenstone rocks in the Central Tanzania Region includes E-W-trending orthogneisses. These comprise largely >3140 Ma diorite to granodiorite gneisses with rafts and/or tectonic enclaves of supracrustal rocks, including ∼3600 Ma fuchsitic sericite quartzite, which forms part of the ∼25 km by 5 km Simba-Nguru Hills in the Undewa-Ilangali Terrane. This quartzite contains detrital 4013–3600 Ma zircons that define ancestral cycles of protracted magmatism in their as yet undetected source terranes. In addition to the ∼2815–2670 Ma granitoids and greenstones in the >3000 Ma gneisses and granitoids within the widely accepted marginal zone of the Tanzania Craton, the Lake Nyanza Superterrane extends east into the Kilindi-Handeni Superterrane, in the largely Neoproterozoic Southern East African Orogen. In this Superterrane, Neoarchean igneous and sedimentary rocks in the Mkurumu-Magamba Terrane record ∼620–603 Ma amphibolite-granulite facies metamorphism, ∼585–575 Ma partial-melting, and emplacement of enderbitic-charnockitic granitoids. They also record a short-lived, but significant, 570–560 Ma period of exhumation and emplacement of high-grade metamorphic rocks on to basement rocks of the proto-Archean craton within the Central Tectonic Zone in the Southern East African Orogen.en_US
dc.identifier.citationKabete, J.M., McNaughton, N.J., Groves, D.I. and Mruma, A.H., 2012. Reconnaissance SHRIMP U–Pb zircon geochronology of the Tanzania Craton: evidence for Neoarchean granitoid–greenstone belts in the Central Tanzania Region and the Southern East African Orogen. Precambrian Research, 216, pp.232-266.en_US
dc.identifier.doi10.1016/j.precamres.2012.06.020
dc.identifier.urihttp://hdl.handle.net/20.500.11810/3953
dc.language.isoenen_US
dc.publisherElsevieren_US
dc.subjectLake Nyanza superterraneen_US
dc.subjectCentral Tanzania Regionen_US
dc.subjectMazoka Greenstone Belten_US
dc.subjectSouthern East African Orogenen_US
dc.subjectMkurumu-Magamba Terraneen_US
dc.subjectMagambazien_US
dc.titleReconnaissance SHRIMP U–Pb zircon geochronology of the Tanzania Craton: Evidence for Neoarchean granitoid–greenstone belts in the Central Tanzania Region and the Southern East African Orogenen_US
dc.typeJournal Article, Peer Revieweden_US
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