Lower Kadubu Gr

Cenozoic

Mesozoic

Paleozoic

Neoproterozoic

Paleoproterozoic

Lower Kadubu Gr

Period:

Tonian

Age Interval:

Middle Tonian

Province:
Eastern Congo Margin

Type Locality and Naming

Itombwe Basin, DRC. Neoproterozoic sedimentary rocks exposed on the eastern CS, Subdivided into three formations, i.e. Kigogo, Kalama and Mudubwe.

Synonym:

Reference: 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).]

Lithology and Thickness

consists of approximately 3,700 m-thick siliciclastic rocks – lower Kigogo Fm (strata not given), the thick Katama Fm of sandy claystone, and the upper clayey sandstone of the Mudubwa Fm.

Lithology Pattern:

Sandy claystone

Relationships and Distribution

Lower contact

Lower Kadubu Group rests unconformably on a metamorphic and crystalline Burundian-Ruzizian basement,

Upper contact

Overlain conformably by the Upper Kadubu Gr

Regional extent

The Itombwe basin is recognized in the DRC Neoproterozoic sedimentary rocks exposed on the eastern CS.

GeoJSON

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Fossils

Age

Age Span:

Beginning stage:

Tonian

Fraction up in beginning stage:

0.3

Beginning date (Ma):

916.00

Ending stage:

Tonian

Fraction up in the ending stage:

1.0

Ending date (Ma):

720.00

Depositional setting

Depositional pattern:

Additional Information

The Itombwe Supergroup was affected by metamorphism from greenschist facies to weakly wrinkled metamorphosed. 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).

Compiler:

Enam O. Obiosio, Solomon Joshua Avong and Henry Nasir Suleiman (2024) - Stratigraphic Lexicon compiled from the following books:

Geology and Resource Potential of the Congo Basin by Maarten J. de Wit, François Guillocheau and Michiel C.J. de Wit, Published Springer-Verlag Berlin Heidelberg 2015; DOI 10.1007/978-3-642-29482-2

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