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Minerals 2018, 8(9), 394; https://doi.org/10.3390/min8090394

Geology and U-Th-Pb Dating of the Gakara REE Deposit, Burundi

1
Géosciences Rennes-UMR 6118, University Rennes, CNRS, F-35000 Rennes, France
2
Earth Sciences Department, University of Burundi, 2700 Bujumbura, Burundi
3
Institut des Sciences de la Terre d’Orléans (ISTO) Université d’Orléans·CNRS·BRGM, UMR 7327, 1A rue de la Férollerie, CS 20066, F-45071 Orléans CEDEX 2, France
4
Rainbow Rare Earths, 3 Boulevard du Japon, Bujumbura, Burundi
*
Author to whom correspondence should be addressed.
Received: 27 June 2018 / Revised: 4 September 2018 / Accepted: 5 September 2018 / Published: 7 September 2018
(This article belongs to the Special Issue Toward Mineral Systems for HFSE Rare Metals)
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Abstract

The Gakara Rare Earth Elements (REE) deposit is one of the world’s highest grade REE deposits, likely linked to a carbonatitic magmatic-hydrothermal activity. It is located near Lake Tanganyika in Burundi, along the western branch of the East African Rift. Field observations suggest that the mineralized veins formed in the upper crust. Previous structures inherited from the Kibaran orogeny may have been reused during the mineralizing event. The paragenetic sequence and the geochronological data show that the Gakara mineralization occurred in successive stages in a continuous hydrothermal history. The primary mineralization in bastnaesite was followed by an alteration stage into monazite. The U-Th-Pb ages obtained on bastnaesite (602 ± 7 Ma) and on monazite (589 ± 8 Ma) belong to the Pan-African cycle. The emplacement of the Gakara REE mineralization most likely took place during a pre-collisional event in the Pan-African belt, probably in an extensional context. View Full-Text
Keywords: U-Th-Pb dating; REE deposit; bastnaesite; monazite; Gakara; Burundi U-Th-Pb dating; REE deposit; bastnaesite; monazite; Gakara; Burundi
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).
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Ntiharirizwa, S.; Boulvais, P.; Poujol, M.; Branquet, Y.; Morelli, C.; Ntungwanayo, J.; Midende, G. Geology and U-Th-Pb Dating of the Gakara REE Deposit, Burundi. Minerals 2018, 8, 394.

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