Malagarazi Super Gr

The Malagarazi-Bukoban Basin (Burundi-Tanzania) is located along the boundary between the Archean Tanzania Craton to the east, the Mesoproterozoic Karagwe-Ankole Belt to the west and the Paleoproterozoic Ubendian Belt to the south. Lithostratigraphically, the Malagarazi Supergroup is divided from base to top into Musindozi Gr, Mosso Gr and Kibago Gr (Tack 1995).

Synonym:

Reference: Tack 1995; de Wit et al., 2015

[Fig 1. Lithostratigraphic synthesis for the Neoproterozoic to Early Paleozoic period. Compiled after various authors (see text).Dotted lines between Banalia, Alolo and Galamboge formations: stratigraphic transition by recurrences.]

[Fig 2. Lithostratigraphic columns for the Congo Basin established using data from the 4 wells in the central part of the basin and outcrops on its NE margin (Lindi-Ubangi and Kisangani-Kindu region), compared with the West-Congo and Katanga stratigraphy.]

[Fig. 3.Simplified geological map of Sub-Saharan Africa showing the Neoproterozoic basins on and around the Congo Shield (modified after De Waele et al. 2008). (LC) Lower Congo Basin, (Co) Comba Basin, (Sa) Sangha Basin, (Ny) Nyanga-Niari Basin, (An) Angola Basin, (SO) Semb-Ouesso Basin, (Ba) Ubangui Basin, (LiB) Likki-Bembe´ Basin, (Bk) Bakouma Basin, (Fou) Fouroumbala Basin, (Li) Lindi Basin, It Itombwe Basin, (Ma)Malagarazi-Bukoban Basin, (Mb) Sankuru-Mbuji-Mayi-Lomami-Lovoy Basin, (Lu) Luamba Group, (Kat) Katanga Basin, (RB) Ruwenzorian Belt, KaB) Karagwe-Ankole Belt, (RuB) Ruzisian Belt, (KiB) Kibaran Belt,(UB) Ubendian Belt, IB Irumide Belt]

[Fig. 4. Stratigraphic correlation between the Neoproterozoic sedimentary basins in Central Africa. Correlations based on Sr isotopic data, radiometric age constraints and revised lithological relationships (de Wit et al., 2015).]

Consists of the 290–890 m-thick siliciclastic and carbonate in the Musindozi Group; approximately 150 m-thick siliciclastic and carbonate in the Mosso Group including 100 m-thick amygdaloidal basalts and the 865 m-thick red-bed siliciclastic Kibago Group. Stratigraphic-equivalent to the Bukoban Supergroup of Tanzania.

If similar to West Congo Margin basins as shown in the basin-correlation diagram in de Wit et al. (2015), the basin fills begin at ca. 900 Ma, and this SuperGroup ends with the onset of the first Cryogenian glacial.

The Malagarazi-Bukoban Supergroup are unmetamorphosed (Tack 1995). Deformation in the Itombwe and Malagarazi-Bukoban basins may be kinematically linked with strike-slip reactivation of the Kibaran and Karangwe-Ankole belts and/or Ubendian Belt during Pan-African orogen (de Wit et al., 2015).