...Marjorie Pivin; Julien Berger; Daniel Demaiffe Abstract A xenolith made of exceptionally Cr-rich minerals (mostly omphacite, kyanite and minor rutile) has been found in the diamondiferous Mbuji-Mayi kimberlite province, Democratic Republic of Congo (DRC). Chromium contents (Cr 2 O 3 ) are hetero...

... through the sample, interacting with a volume of material. Fibrous diamonds from Mbuji-Mayi, Democratic Republic of Congo; the Wawa area, Ontario, Canada; and the Panda kimberlite, Ekati Mine, Northwest Territories and the Jericho kimberlite, Nunavut, Canada were analysed using X-rays from a high...

...Urs Schärer; Jasper Berndt; Alex Deutsch Abstract Fragments of five Cretaceous cm-size baddeleyite (ZrO 2 ) and two zircon (ZrSiO 4 ) crystals from the Mbuji-Mayi kimberlite (DR Congo) were measured for trace elements by the LA-ICP-MS technique. EPMA was applied adjacent to the laser spots...

... subsidiary, Sibeka). Recently, Umicore sold its shares in MIBA to Mwana Africa, a company quoted on AIM in the United Kingdom. Besides alluvial mining, MIBA exploits diamonds from a kimberlitic pipe near Mbuji-Mayi. Since independence, mining has remained the country’s principal industrial activity...

..., KGM=Kigoma, KIS=Kisangani, KND=Kindu, KNG=Kananga, LUB=Lubumbashi, MBJ=Mbuji-Mayi, and UVI=Uvira. The geographic coordinates of the cities are listed in Table 3 . ...

... provide information that has been averaged over numerous multiphase microinclusions. Two sets of fibrous diamonds were studied: 1) Whole cubic and coated diamonds from Brazilian placers ( n = 8) and from the Congo (presumably, Mbuji-Mayi) ( n = 8). The size of the crystals was 2–4 mm. All...

... , D. and Javaux , E.J. (2016) A diverse and exquisitely preserved organic-walled microfossil assemblage from the Meso–Neoproterozoic Mbuji-Mayi Supergroup (Democratic Republic of Congo) and implications for Proterozoic biostratigraphy . Precambrian Res. , v. 281 , pp. 166 - 184...

... to develop in other areas of the world. A detailed broader history of the development of diamond mining across Africa is given by Janse (1995 , 1996 ) who noted the inception of alluvial mining in Zaire (now the Democratic Republic of Congo, DRC) in 1903 and the Mbuji Mayi area in 1918, and in Angola...

... , V. , Mattielli , N. , Demaiffe D. , 2013 . Nd–Hf isotope systematics of megacrysts from the Mbuji-Mayi kimberlites, D. R. Congo: Evidence for a metasomatic origin related to kimberlite interaction with the cratonic lithospheric mantle , in: Proceedings of 10th International Kimberlite...

... (e.g., Mbuji Mayi, Democratic Republic of Congo); conversely, low-grade pipes can have high average values (e.g., Letseng, Lesotho) ( F ig . 3 ). These parameters, coupled with the low concentration of diamond and the importance of diamond size, all exert significant influence on resource estimation...

... on the diagenesis and sediment sources of the lower group (BI) of the Mbuji-Mayi Supergroup (Democratic Republic of Congo) : Precambrian Research , v. 298 , p. 202 – 219 , https://doi.org/10.1016/j.precamres.2017.06.012 . Haines , P.W. , Wingate , M.T.D. , and Kirkland , C.L. , 2013...

... Neoproterozoic (0.8–0.72 Ga) Mbuji-Mayi Supergroup in the Democratic Republic of the Congo ( Francois et al. 2017 ). Terrestrial sediments are likewise rare during the Cambrian, Ordovician, and Silurian limiting access to fossil evidence of life on land, fungi included, with generally sparse equivocal fungal...

... , A. , Blanpied , C. , Virgone , A. , Jelsma , H. , Preat , A. , 2013 . Depositional age, provenance, and tectonic and paleoclimatic settings of the late Mesoproterozoic–middle Neoproterozoic Mbuji-Mayi Supergroup, Democratic Republic of Congo . Palaeogeogr. Palaeoclimatol. Palaeoecol. 389 , 4...

... Congo and Mbuji-Mayi supergroups: A preserved marine signature? Palaeogeography, Palaeoclimatology, Palaeoecology , 389 , 35 – 47 . Delpomdor , F. , Tack , L. , Cailteux , J. and Préat , A. , 2015 . The C2 and C3 formations of the Schisto-Calcaire Subgroup (West Congo...

... Zealand Ward (1984)   2.9 metachert Jacobs River, New Zealand Cooper (1980)   3.0 amphibolite Kini Creek, New Zealand Grapes (1981)   4.4 6.4 ultrabasic rock Cabo Ortegal, Spain Gil Ibarguchi et al. (1991)   11.8 clinopyroxenite xenolith Mbuyi-Mayi, D.R. Congo Pivin et...

... is unknown. The example of the Bakwanga kimberlites (Congo) cannot be used: the Mbuji-Mayi placers fully correspond to productive kimberlites specialized in cuboids, whereas the rich placers in the northeastern Siberian Platform are associated only with unproductive kimberlites. The light isotopic...

... from Roberts Victor mine, South Africa . Lithos 388 : 106057 El Fadili S , Demaiffe D , Gurney JJ ( 1999 ) Petrology of eclogite and granulite nodules from the Mbuji Mayi kimberlites (Kasai, Congo): the significance of kyanite–omphacite intergrowths . In : Proceedings...

...) , Dokl. Earth Sci. , 403 , 1 – 4 , 2005 . 28. Javoy , M. , F. Pineau , and D. Demaiffe , Nitrogen and carbon isotopic composition of diamonds in the diamonds of Mbuji Mayi, Zaire , Earth. Planet. Sci. Lett. , 68 , 399 – 412 , 1984 . 29...