Alkaline Rocks and Carbonatites of the World

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Occurrence number: 
Congo (Kinshasa)
Longitude: 28.63, Latitude: -2.25

This complex is only marginally alkaline. It consists of two intrusions of approximately 3.5x0.6 km elongated east-west and separated by a narrow zone of Burundian-Kibaran mica schists. The northern intrusion is of microsyenite: the southern of microgranite. Both rock types comprise perthite, albite and a little biotite; the principal mafic mineral of the granite is ferropargasitic hornblende, but of the syenite hedenbergite and fayalite; there is a little fluorite in the syenite. Pyroxene, amphibole and ilmenite analyses are given by Rumvegeri et al. (1985) and one of the analyses of amphibole microgranite contains acmite in the norm.

K-Ar on amphibole microgranite gave 542±27 Ma (Rumvegeri et al., 1985).
RUMVEGERI, B.R., CARON, J.-P.H., KAMPUNZU, A.B., LUBALA, R.T. and VELLUTINI, P.J. 1985. Pétrologie et signification géotectonique des plutonites de Kambusi (sud Kivu, Zaïre). Canadian Journal of Earth Science, 22: 304-11.
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