A new terrane-based tectonic subdivision of the Archaean craton and selected belts of Tanzania and its significance to gold Metallogeny

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University of Dar es Salaam
Terrane-based subdivision proposed in this study constitutes a modern approach ending tectonic processes and the formation of world-class nation of world-class gold deposits, as where in the world. Reassessment indicates that six indicates that six NW-SE-trending is make up the Archaean Tanzania Craton. In the Lake Vict raton. In the Lake Victoria Region, the Victoria and Lake Nyanza Superterranes comprise <2.85(anes comprise <2.85Gagold-endowed reenstone terranes, emplaced at least partly, on rifted partly, on rifted >3.11Ga continental superterranes are separated by gold-poor, Mwanza-Lake EPoor, Mwanza-Lake Eyasi Superterrane f granitoid and high-grade metamorphic terranes. In the 3hic terranes. In the Central Tanzania 2815-2660Ma granitoid-greenstones from Mazoka Green; from Mazoka Greenstone Domain are less really extensive, <2.85Gagreenstones tectonically; stones tectonically emplaced on to a initoid-gneisses in the Dodoma Basement, Dodoma Scsement, Dodoma Schist and part of Manyoni Superterranes. These greenstones define linear stones define linear geometries atypical thologies in the >3.2Ga rocks elsewhere in the world (e.g. Lre in the world (e.g. Zimbabwe Craton). superterranes in the Archaean Tanzania Craton are basemnia Craton are basement to Proterozoic East African Orogens. new U-Pb in zircon SHRIMP zircon geochronology shows geochronology shows that greenstones in 2660Ma Mazoka Greenstone Domain evolved concurrently evolved concurrently with greenstones Victoria Region. The >3.6Ga fuchsitic-sericitic quartzite;itic-sericitic quartzite from Mafulungu !trital, —4013-3604Ma zircons recording evidence for exising evidence for existence of ancestral ;rusts in the Central Tanzania Region. The >2681±7Ma En. The >2681±7Ma greenstones in the yamaya Terrane and >2670±8Ma quartzo-feldspathic quartzo-feldspathic gneisses in the Vlagamba Terrane validate the interpretation that Lake Ny'etation that Lake Nyanza Superterrane to the East African Oro en prior to the —620-560Ma Pan-Aft —620-560Ma Pan-African Orogeny. imilarity in the setting of Mkurumu- Magamba Terrane to Magamba Terrane to the setting of the ether, a host to the >150t Au Plutonic Gold Deposit, which Gold Deposit, which lies in close proximity to the Eastern Goldfields Province of the Yilgal) province of the Yilgarn Craton, further the potential for gold discoveries in the —615-520Ma re the —615-520Ma reworked Archaean ideni Superterrane. Another similarity is between trity is between narrow, <2815Ma; edimentary belts the Central Tanzania Region and tht'zania Region and the >400t Au gold-gmatic-sedimentary belts in the Central Yilgarn Craton of Yilgarn Craton of Western Australia, rlines potential for similar discoveries in the Central Taman inthe Central Tanzania Region.
Available in print form, East Africana Collection, Dr. Wilbert Chagula Library, Class mark (THS EAF QE653.3.K32)
Geology, stratigraphic, Archaean, structural, Tectonics (Geology)
Kabete, J. (2008) A new terrane-based tectonic subdivision of the Archaean craton and selected belts of Tanzania and its significance to gold Metallogeny, Master dissertation, University of Dar es Salaam. Dar es Salaam.