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The CONGO CRATON, covered by the Palaeozoic -to-recent Congo Basin , is an ancient Precambrian craton that with four others (the Kaapvaal , Zimbabwe , Tanzania , and West African cratons) makes up the modern continent of Africa
Africa
. These cratons were formed between about 3.6 and 2.0 billion years ago and have been tectonically stable since that time. All of these cratons are bounded by younger fold belts formed between 2.0 billion and 300 million years ago.

The Congo Craton occupies a large part of central southern Africa, extending from the Kasai region of the DRC into Sudan
Sudan
and Angola
Angola
. It forms parts of the countries of Gabon
Gabon
, Cameroon
Cameroon
, and the Central African Republic . A small portion extends into Zambia
Zambia
as well, where it is called the Bangweulu Block .

CONTENTS

* 1 Congo–São Francisco

* 1.1 West Congo Belt

* 2 See also

* 3 References

* 3.1 Notes * 3.2 Sources

CONGO–SãO FRANCISCO

The Congo Craton and the São Francisco Craton are stable Archaean blocks that formed a coherent landmass until the opening of the South Atlantic Ocean during the break-up of Gondwana (c. 2000–130 Ma). They stabilised during the Trans-Amazonian orogeny and Eburnian orogeny and have been affected by a long series of orogens since resulting in similar sequences on both blocks.

Congo–São Francisco experienced three large igneous province (LIP) events at 1380–1370 Ma, c. 1505 Ma, and c. 1110 Ma. The relative position of Congo–São Francisco within the supercontinent Nuna/Columbia can be reconstructed because these LIP events also affected other Precambrian continental blocks. Within Nuna the northern part of Siberia was located adjacent to western São Francisco. 1110 Ma dyke swarms in Angola
Angola
are absent in Siberia but coincide with the Umkondo LIP on the Kalahari Craton and magmatic event in the Bundelkhand Craton in India, the Amazonian Craton in South America, and the Keweenawan Rift in Laurentia (although the latter was located far from the other continental blocks). A series of 1500 Ma dyke swarms also support the close relation between Congo–São Francisco and Siberia: Kuonamka in Siberia and Curaçá and Chapada Diamantina in São Francisco and Angola. These dyke swarms radiate from a mantle plume centre located in what is now north-eastern Siberia. Magmatic events in Congo (Kunene) and Siberia (Chieress) at 1384 Ma also corroborate the closeness of these two continents during at least 120 million years.

It is possible that the 1110 Ma LIP in Congo–São Francisco, Amazonia, and India was part of a much larger event that also involved West Africa
Africa
and Kalahari (with a possible but unlikely link to the 1075 Ma Warakurna LIP in Australia). However, while the palaeo-latitudes of India and Kalahari are well constrained, those of Amazonia and Congo–São Francisco are not, making any plate tectonic reconstruction speculative.

At the time for the formation of the supercontinent Gondwana at c. 550 Ma the Congo Craton formed the already amalgamated central African landmass. The southern and eastern margins (modern coordinates) of this landmass was made of the Archaean Angola-Kasai block and Tanzanian Craton. These proto-Congo blocks were deformed in the Palaeoproterozoic Eburnean orogeny but later stabilised.

WEST CONGO BELT

Before the opening of the South Atlantic the São Francisco and Congo cratons were connected by a "cratonic" bridge, the Bahia–Gabon Bridge. The most recent orogenic event on this bridge occurred at 2 Ga, so the connection between São Francisco and Congo must have formed during the Palaeoproterozoic. South of this cratonic bridge the Araçuaí–West Congo orogen evolved in the Neoproterozoic in a sea basin made of oceanic crust, an embayment in the São Francisco–Congo continent.

The West Congo Pan-African Belt includes major magmatic events at c. 1000 and 910 Ma. In the Early Neoproterozoic, the western edge of Congo Craton was the location for the initial rifting of Rodinia before its break-up. During the Neoproterozoic, Central Congo or Bas-Congo became a passive margin on which was deposited 4,000 m (13,000 ft) sediments. At the end of the Neoproterozoic, Bas-Congo was only affected by the Pan-African orogeny at 566 Ma to a limited extent protected by this passive margin and by the thickness of the craton. At 1000 Ma peralkaline magmatism initiated an early transtensional setting along the western edge of the Congo Craton. An LIP at c. 930–920 Ma was followed by felsic magmatism between c. 920–910 Ma which had a short emplacement interval and resulted in a 3,000–4,000 m (9,800–13,100 ft) thick sequence. Mafic-felsic magma sequences (6,000 m (20,000 ft) thick) on the western edge of the Congo Craton are similar to those of the Paraná and Deccan LIPs, but in the Congo Craton the magma source became shallower with time. There was no geodynamic activity along the western Congo margin during the Mesoproterozoic.

SEE ALSO

* Damara Orogeny

REFERENCES

NOTES

* ^ Ernst et al. 2013 , Conclusions, p. 116 * ^ Pedreira & De Waele 2008 , p. 33–34 * ^ Ernst et al. 2013 , Abstract * ^ Pisarevsky et al. 2014 , Congo/ São Francisco and Siberia * ^ de Kock et al. 2014 , Other 1.1 Ga LIPs?, pp. 139–140 * ^ De Waele, Johnson Pedrosa-Soares, A. C.; Trindade, R. I. F. D.; Martins, M.; Noce, C. M.; Liu, D. (2012). "Neoproterozoic glacial deposits from the Araçuaí orogen, Brazil: Age, provenance and correlations with the São Francisco craton and West Congo belt" (PDF). _ Gondwana Research_. 21 (2): 451–465. doi :10.1016/j.gr.2011.04.008 . Retrieved 7 May 2017. * de Kock, M. O.; Ernst, R.; Söderlund, U.; Jourdan, F.; Hofmann, A.; Le Gall, B.; Bertrand, H.; Chisonga, B. C.; Beukes, N.; Rajesh, H. M.; Moseki, L. M.; Fuchs, R. (2014). "Dykes of the 1.11 Ga Umkondo LIP, Southern Africa: Clues to a complex plumbing system" (PDF). _ Precambrian Research_. 249: 129–143. doi :10.1016/j.precamres.2014.05.006 . Retrieved 6 May 2017. * De Waele, B.; Johnson, S. P.; Pisarevsky, S. A. (2008). " Palaeoproterozoic to Neoproterozoic growth and evolution of the eastern Congo Craton: its role in the Rodinia puzzle" (PDF). _ Precambrian Research_. 160 (1): 127–141. Retrieved 6 May 2017. * Ernst, R. E.; Pereira, E.; Hamilton, M. A.; Pisarevsky, S. A.; Rodriques, J.; Tassinari, C. C.; Teixeira, W.; Van-Dunem, V. (2013). " Mesoproterozoic intraplate magmatic ‘barcode’record of the Angola portion of the Congo Craton: Newly dated magmatic events at 1505 and 1110Ma and implications for Nuna (Columbia) supercontinent reconstructions" (PDF). _ Precambrian Research_. 230: 103–118. Retrieved 6 April 2017. * Pisarevsky, S. A.; Elming, S. Å.; Pesonen, L. J.; Li, Z. X. (2014). " Mesoproterozoic paleogeography: supercontinent and beyond" (PDF). _ Precambrian Research_. 244: 207–225. doi :10.1016/j.precamres.2013.05.014 . Retrieved 6 May 2017. * Pedreira, A. J.; De Waele, B. (2008). "Contemporaneous evolution of the Palaeoproterozoic– Mesoproterozoic sedimentary basins of the São Francisco–Congo Craton" (PDF). _Geological Society, London, Special
Special
Publications_. 294 (1): 33–48. Retrieved 6 May 2017. * Tack, L.; Wingate, M. T. D.; Liégeois, J. P.; Fernandez-Alonso, M.; Deblond, A. (2001). "Early Neoproterozoic magmatism (1000–910 Ma) of the Zadinian and Mayumbian Groups (Bas-Congo): onset of Rodinia rifting at the western edge of the Congo craton" (PDF). _Precambrian research_. 110 (1): 277–306. doi :10.1016/S0301-9268(01)00192-9 . Retrieved 7 May 2017.

* v * t * e

Major African geological formations

PLATES

* African Plate * Somali Plate * Madagascar Plate * Seychelles Plate

CRATONS AND SHIELDS

* Arabian-Nubian Shield * Congo Craton * Kaapvaal Craton * Kalahari Craton * Saharan Metacraton * Tanzania Craton * Tuareg Shield * West African Craton * Zimbabwe Craton

SHEAR ZONES

* Aswa Dislocation * Broodkop Shear Zone * Central African Shear Zone * Chuan Shear Zones * Foumban Shear Zone * Kandi Fault Zone * Mwembeshi Shear Zone * Todi Shear Zone * Western Meseta Shear Zone

OROGENS

* Alpide Orogen * Cape Fold Belt * Damara Orogen * East African Orogen * Eburnean Orogen * Gondwanide Orogen * Kibaran Orogen * Kuunga Orogen * Mauritanide Belt * Pan-African orogens * Terra Australis Orogen

RIFTS

* Afar Triangle * Anza trough
Anza trough
* Bahr el Arab rift * Benue Trough * Blue Nile rift * East African Rift * Gulf of Suez Rift * Lamu Embayment * Melut Basin * Muglad Basin * Red Sea Rift * Sangha Aulacogen * Atbara rift * White Nile rift

SEDIMENTARY BASINS

* Angola
Angola
Basin * Aoukar * Blue Nile Basin * Chad Basin * Congo Basin * Douala Basin * El Djouf * Foreland Karoo Basin * Gabon
Gabon
Basin * Iullemmeden Basin * Kufra Basin * Murzuq Basin * Niger Delta Basin * Ogaden Basin * Orange River basin * Ouled Abdoun Basin * Owambo Basin * Reggane Basin * Rio del Rey Basin * Sirte Basin * Somali Coastal Basin * Taoudeni basin * Tanzania Coastal Basin * Tindouf Basin * Turkana Basin

MOUNTAIN RANGES

* Aïr Mountains * Atlas Mountains * Aurès Mountains * Bambouk Mountains * Blue Mountains * Cameroon
Cameroon
line * Central Pangean Mountains * Chaillu Mountains * Drakensberg * Ethiopian Highlands * East African mountains * Great Escarpment * Great Karas Mountains * Guinée forestière * Imatong Mountains * Jebel Uweinat * Loma Mountains * Mandara Mountains * Marrah Mountains * Mitumba Mountains * Nuba Mountains * Rif Mountains * Rwenzori Mountains * Sankwala Mountains * Serra da Leba * Serra da Chela * Teffedest Mountains * Tibesti Mountains

* v * t * e

Continents of the world

Africa
Africa

Antarctica
Antarctica

Asia
Asia

Australia

Europe
Europe

North America
North America

South America

Afro-Eurasia

Americas

Eurasia

Oceania

* FORMER SUPERCONTINENTS Gondwana * Laurasia * Pangaea * Pannotia * Rodinia * Columbia * Kenorland * Nena * Sclavia * Ur * Vaalbara

* HISTORICAL CONTINENTS Amazonia * Arctica * Asiamerica * Atlantica
Atlantica
* Avalonia
Avalonia
* Baltica
Baltica
* Cimmeria * Congo craton
Congo craton
* Euramerica * Kalaharia * Kazakhstania * Laurentia * North China * Siberia * South China * East Antarctica
Antarctica
* India

* SUBMERGED CONTINENTS Kerguelen Plateau * Zealandia

* POSSIBLE FUTURE SUPERCONTINENTS Pangaea Ultima * Amasia * Novopangaea
Novopangaea

* MYTHICAL AND HYPOTHESISED CONTINENTS Atlantis
Atlantis
* Kumari Kandam * Lemuria * Meropis * Mu * Hyperborea * Terra Australis

* _See also Regions of the world _ * _ Continental fragment _

* BOOK * CATEGORY

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