Mineralogy and geochemistry of Neoproterozoic siliceous manganese formations from Ntui–Betamba (Cameroon Pan-African Fold Belt): implications for mineral exploration

Results of new geological mapping with the help of air and satellite photography in Sudan together with information from adjacent territories has enabled a map to be drawn showing the dominant basement tectonic trends in a previously geologically unknown area. Over 100 age determinations, including 25 unpublished analyses, allow the recognition of Eburnian age events in Central Africa Republic and southeast Libya similar to the 1950 million year (Ma) old Ruwenzori Belt in Uganda and similar events in Zaire. A northeast trending fold belt is recognized in Central Africa, western Sudan and southeast Egypt in which 1000 Ma ages are found. The Pan African age Mozambique belt truncates older structures in eastern Uganda and southern Sudan but is covered by a greenschist volcanic assemblage along the Red Sea coast in which 550 ± 150 Ma old granites and regional metamorphism occur.

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Transpression and transection in the late Pan-African Vanrhynsdorp foreland thrust-fold belt, South Africa

Journal of African Earth Sciences ◽

10.1016/0899-5362(95)00089-c ◽

1995 ◽

Vol 21 (1) ◽

pp. 91-105 ◽

Cited By ~ 15

Author(s):

P.G. Gresse

Keyword(s):

South Africa ◽

Fold Belt ◽

Pan African

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Petrogenesis of peraluminous magmas from the Akum-Bamenda Massif, Pan-African Fold Belt, Cameroon

International Geology Review ◽

10.1080/00206810903442402 ◽

2010 ◽

Vol 53 (10) ◽

pp. 1121-1149 ◽

Cited By ~ 8

Author(s):

Jean Paul Nzenti ◽

Barbara Abaga ◽

Cheo Emmanuel Suh ◽

Charles Nzolang

Keyword(s):

Fold Belt ◽

Pan African

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Geochemistry of the Serra das Melancias Pluton in the Serra da Aldeia Suite: a classic post-collisional high Ba-Sr granite in The Riacho do Pontal Fold Belt, NE Brazil

Brazilian Journal of Geology ◽

10.1590/2317-4889201620160002 ◽

2016 ◽

Vol 46 (2) ◽

pp. 221-237 ◽

Cited By ~ 2

Author(s):

Marcela Paschoal Perpétuo ◽

Wagner da Silva Amaral ◽

Felipe Grandjean da Costa ◽

Evilarde Carvalho Uchôa Filho ◽

Daniel Francisco Martins de Sousa

Keyword(s):

Rare Earth ◽

Rare Earth Elements ◽

Geochemical Data ◽

Fold Belt ◽

Heavy Rare Earth ◽

Pan African ◽

High K ◽

Heavy Rare Earth Elements ◽

Brasiliano Orogeny ◽

Light Rare Earth Elements

ABSTRACT: The Serra da Aldeia Suite is composed by circular or oval-shaped plutons, intrusive in meta-sedimentary and meta-volcanosedimentary rocks in the Riacho do Pontal Fold Belt, NE Brazil. The Serra das Melancias Pluton, belonging to Serra da Aldeia Suite, is located southeastern of Piaui state, near Paulistana city. These plutons represent a major magmatic expression in this area and contain important information about the late magmatic/collisional geologic evolution of the Brasiliano Orogeny. Based on petrographic and geochemical data, three facies were defined in the Serra das Melancias Pluton: granites, syenites and quartz monzonites. The rocks display high-K and alkaline to shoshonitic affinities, are metaluminous and show ferrous character. They are enriched in Light Rare Earth Elements and Large Ion Lithophile Elements, with negative anomalies in Nb, Ta and Ti. Their high Ba, Sr, K/Rb, low Rb, relatively low U, Th, Nb to very low Heavy Rare Earth Elements and Y resemble those of typical high Ba-Sr granitoids. The geochemical data suggest the emplacement of Serra das Melancias Pluton in a transitional, late to post-orogenic setting in the Riacho do Pontal Fold Belt during the late Brasiliano-Pan African Orogeny.

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