Provenance and chemostratigraphy of the Neoproterozoic West Congolian Group in the Democratic Republic of Congo

Frimmel, Hartwig E.; Tack, L.; Basei, Miguel Ângelo Stipp; Nutman, Allen P.; Boven, A.

doi:10.1016/j.jafrearsci.2006.04.010

Cited by 97 publications

(120 citation statements)

References 43 publications

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“…Geographical location and geological setting of the Inkisi Formation [map built from the maps of Alvarez and al., (1995) and Frimmel and al., (2006)]. …”

Section: Figmentioning

confidence: 93%

Albitization in the Inkisi Sandstones, Republic of Congo: Characterization and Interpretation

Sounga¹,

Affaton²,

Noack³

et al. 2013

Glo Jnl Geo Sci

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Albitization appears to be one of the most important transformations affecting aluminium silicates in the superficial zone of the Earth's crust, occurring in a variety of different formations. However, this process has not yet been clearly recognized in Africa. In this paper, we present the process of albitization in the context of an African sedimentary basin, in particular the Neoproterozoic to Palaeozoic arkosic sandstones of the Niari basin in the Republic of Congo. Differents faciès, mineral parageneses associated, chemical compositions of these albitizations are presented. The morphology of these albitization textures, which are often developed as a peripheral halo composed of pure albite surrounding (with a sharp contact) the practically unaltered potassium feldspar, would argue in favour of in situ albitization. In the same way, the presence of calcium-rich zones sometimes surrounding the albitized domains would support this hypothesis, the calcium being exsolved at the outer grain boundary during in situ formation of the albite. Thus, the presence of in situ albitization in the Inkisi sandstone could indicate an important marine influence on the sedimentary environment and diagenesis of these sandstones.

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“…Geographical location and geological setting of the Inkisi Formation [map built from the maps of Alvarez and al., (1995) and Frimmel and al., (2006)]. …”

Section: Figmentioning

confidence: 93%

Albitization in the Inkisi Sandstones, Republic of Congo: Characterization and Interpretation

Sounga¹,

Affaton²,

Noack³

et al. 2013

Glo Jnl Geo Sci

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“…These obtained ages on the LDF constrain the episodic extensional activity recorded on the presentday African side of the AWCO (loosely dated 735-675 Ma "E6" rifting event; Pedrosa-Soares & Alkmin, 2011). Detrital U-Pb single-zircon dating of the bottom contact of the upper formation of the Haut-Shiloango Subgroup (Sh6) points to a probably most reliable maximum depositional age of ~650 Ma (Frimmel et al, 2006). Carbonates of the uppermost Haut-Shiloango Subgroup (Sh8) were dated at ~645 Ma by near-primary 87 Sr/ 86 Sr ratios (Frimmel et al, 2006;Poidevin, 2007).…”

Section: Geochronologymentioning

confidence: 99%

“…The foreland domain is composed of subtabular unmetamorphosed rocks and reaches its maximum width of approximately 300 km around 5°S in the Lower Congo region. Correspondingly, it is the reference area for the description of sedimentary strata of the belt (e.g., Frimmel et al, 2006). To the west, in contrast, series of the thrust-and-fold belt domain are metamorphosed (Frimmel et al, 2006).…”

Section: Regional Contextmentioning

confidence: 99%

“…Correspondingly, it is the reference area for the description of sedimentary strata of the belt (e.g., Frimmel et al, 2006). To the west, in contrast, series of the thrust-and-fold belt domain are metamorphosed (Frimmel et al, 2006). In the DRC, the lithostratigraphic terminology of the WCS has been recently redefined.…”

Section: Regional Contextmentioning

confidence: 99%

“…Detrital U-Pb single-zircon dating of the bottom contact of the upper formation of the Haut-Shiloango Subgroup (Sh6) points to a probably most reliable maximum depositional age of ~650 Ma (Frimmel et al, 2006). Carbonates of the uppermost Haut-Shiloango Subgroup (Sh8) were dated at ~645 Ma by near-primary 87 Sr/ 86 Sr ratios (Frimmel et al, 2006;Poidevin, 2007). Two samples of the equivalent Louila Formation only gave a major 900-1100 Ma peak (Affaton et al, 2016), which is thus not relevant in terms of constraining the depositional age of this formation.…”

Section: Geochronologymentioning

confidence: 99%

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Facies and micromorphology of the Neoproterozoic Upper Diamictite Formation in the Democratic Republic of Congo: new evidence of sediment gravity flow

Delpomdor¹,

Tack²,

Préat³

2017

Geol. Belg.

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ABSTRACT. The Upper Diamictite Formation of the West Congo Supergroup is a diamictite-dominated succession variously interpreted as a continental tillite, glaciomarinite, and glacially-influenced or non-glacial debrite. This paper presents a detailed macroand microscale analysis of soft-sediment deformation structures in order (1) to resolve the long-standing debate on the genetic origin of the Upper Diamictite Formation, and (2) to constrain the paleoenvironmental conditions during the Marinoan global event. The predominance of ductile and brittle deformations and grain-to-grain compression, considered as evidence of high strain rates and local high stress conditions, indicate that the diamictites were deposited as mass flows. The presence of probable pelagic clays, lonestones, and the absence of direct ice-contact deposits point to a subaqueous gravity flow origin. These diamictites were deposited along the margin or at the foot of the basin slope. They were probably triggered by oversteepening and/or tectonic shocks in the Araçuaí-West Congo Orogen between 630 and 660 Ma. The Upper Diamictite Formation provides no support for the postulated global Marinoan glaciation at this time and underscores the importance of a local tectonic control on the sedimentation.

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The Gariep Belt

Frimmel

2018

Regional Geology Reviews

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Provenance and chemostratigraphy of the Neoproterozoic West Congolian Group in the Democratic Republic of Congo

Cited by 97 publications

References 43 publications

Albitization in the Inkisi Sandstones, Republic of Congo: Characterization and Interpretation

Albitization in the Inkisi Sandstones, Republic of Congo: Characterization and Interpretation

Facies and micromorphology of the Neoproterozoic Upper Diamictite Formation in the Democratic Republic of Congo: new evidence of sediment gravity flow

The Gariep Belt

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