REE mineralization at Gakara, Burundi: Evidence for anomalous upper mantle in the western Rift Valley

Details REE mineralization at Gakara, Burundi: Evidence for anomalous upper mantle in the western Rift Valley REE mineralization at Gakara, Burundi: Evidence for anomalous upper mantle in the western Rift Valley

Jan 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994gecoa..58..985l&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 58, Issue 2, pp.985-992

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The 587 Ma-old hydrothermal bastnaesite mineralization of Gakara in the western branch of the East African Rift in Burundi has geological and chemical features typical of carbonatite-related REE ore deposits, but Nd, Ce, and Sr isotope data on the bastnaesite indicate a time-integrated LREE-enriched source with Nd ( T )-11.9, Ce ( T ) 1.6, and 87 Sr / 86 Sr 0.7075. The mid-Proterozoic Nd model age of this source coincides with the formation of the intracratonic Kibaran basin of central Africa and may indicate a mid-Proterozoic rift-related event of small-scale, but locally very effective, mantle metasomatism in this region. The formation of REE ore deposits in carbonatite environments is possibly linked to enriched mantle domains.

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