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U-Pb columbite age of Neoproterozoic Ta-Nb mineralization in Burundi
Luleå tekniska universitet.
Institut für Mineralogie und Mineralische Brukstoffe.
1995 (English)In: Economic geology and the bulletin of the Society of Economic Geologists, ISSN 0361-0128, E-ISSN 1554-0774, Vol. 90, no 8, p. 2303-2309Article in journal (Refereed) Published
Abstract [en]

Tin granites and associated Ta-Nb pegmatites in the Kibran belt of central Africa have been dated earlier only by highly scattered Rb-Sr data that were interpreted to reflect events at 1000 to 900 and 650 to 550 Ma. New U-Pb dating of columbite from the Kuvuvu and Ruhembe pegmatites in Burundi precisely determines the age of the mineralization and indirectly also the age of the associated granite magmatism. Columbites from the Kuvuvu and Ruhumbe pegmatites have variably discordant U-Pb data that define emplacement ages at 962 ± 2 Ma (2σ) and 968-29+33 Ma, respectively. The lower intercept ages at 628 ± 110 Ma and 622 ± 56 Ma are interpreted to reflect the pan-African brittle reworking of the pegmatite system when Au and Bi were redistributed on fractures and secondary sericite formed. The U-Pb age data from columbite thus confirm earlier interpretations of Rb-Sr data

Place, publisher, year, edition, pages
1995. Vol. 90, no 8, p. 2303-2309
National Category
Geochemistry
Research subject
Applied Geology
Identifiers
URN: urn:nbn:se:ltu:diva-6269Local ID: 478c3d10-b707-11dd-9c2e-000ea68e967bOAI: oai:DiVA.org:ltu-6269DiVA: diva2:979146
Note

Godkänd; 1995; 20081120 (andbra)

Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2018-02-06Bibliographically approved

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