The eclogites of the Lato hills, south Togo, West Africa: Relics from the early tectonometamorphic evolution of the Pan-African orogeny

Ménot, René-Pierre; Seddoh, K. F.

doi:10.1016/0009-2541(85)90126-3

Cited by 30 publications

(18 citation statements)

References 21 publications

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“…The mineral parageneses assigned to the eclogite facies are comparable with those studied by Affaton et al (1978), MØnot and Seddoh (1985), AgbossoumondØ (1998) and Attoh (1998). They are probably related to eclogitization at a temperature of 600±800 C and a pressure of 14±18 kbar.…”

Section: Metamorphic Petrologysupporting

confidence: 65%

“…1) were separated from a depleted mantle source between 1149 and 1164 Ma (Nd model ages) and crystallized at 822+129/±91 Ma (U±Pb zircon age). Eclogitization occurred at 638+12/±53 Ma (U±Pb zircon age), at a temperature of 600 or 700±750 C and a pressure of 16±18 kbar (MØnot and Seddoh 1985;Attoh 1998). These eclogites underwent cooling between 598 12 and 571 12 Ma (Rb±Sr mineral ages).…”

Section: Resultsmentioning

confidence: 97%

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Pan-African granulite formation in the Kabye Massif of northern Togo (West Africa): Pb−Pb zircon ages

Affaton

Kröner²,

Seddoh

2000

International Journal of Earth Sciences

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Metamorphic zircons from seven granulite facies orthogneisses of tonalitic composition (enderbites), collected from four different nappes of the Kabye Massif in the Dahomeyide belt of northern Togo, were dated by the Pb±Pb evaporation method. They yielded consistent Neoproterozoic ages with a mean of 612.5 0.8 Ma, interpreted to reflect the peak of regional granulite facies metamorphism following Pan-African continental collision between the West African and Benin-Nigerian plates. These results support previous ages obtained by various chronometers on high-grade rocks from the same suture zone and from surrounding units in Togo, Benin and Ghana. They are also similar to zircon ages from granulites in the Mozambique belt of souteastern Africa. These Pan-African metamorphic ages reflect continental amalgamation resulting in the formation of the Gondwana supercontinent towards the end of the Neoproterozoic.

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Section: Metamorphic Petrologysupporting

confidence: 65%

Section: Resultsmentioning

confidence: 97%

Pan-African granulite formation in the Kabye Massif of northern Togo (West Africa): Pb−Pb zircon ages

Affaton

Kröner²,

Seddoh

2000

International Journal of Earth Sciences

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“…This zone continues from Accra, through Togo and Gourma, to Hoggar (central Sahara) and bends abruptly in Mali by the Cambrian indentation of the West African craton during continent-continent collision (Ball, 1980). Sodic amphibole and jadeite occur in Gouma (Black et al, 1979;Caby et al, 1981); quartz-bearing eclogites are present in western Hoggar, central Hoggar, and Lato Hill, Togo (Affaton et al, 1980;Ménot and Seddoh, 1985). The P/T estimates for the Hoggar and Lato Hill eclogites are >14 kbar and T = 650 to 750° C (Sautter, 1985), and >17 kbar and T = 700 to 750° C (Ménot and Seddoh, 1985), respectively.…”

Section: Africamentioning

confidence: 96%

Blueschists and Eclogites of the World and Their Exhumation

Maruyama

Liou

Terabayashi

1996

International Geology Review

575

364

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“…These massifs constitute a series of submeridian mountains mainly made up of granulitic or sometimes eclogitic and mafic to ultramfic rocks. This suture zone, therefore, includes rock types indicating Pan-African crustal thickening and comprising various granulites, pyroxenites and eclogitoids, associated with their heteromorphic equivalents and rare chromitites and metasediments [12,13,15,18,20,21].…”

Section: Regional Geological Contextmentioning

confidence: 99%

“…However, it should be noted that the northern massifs in the Dahomeyide suture zone (those located between Dérouvarou and Anié) remain relatively little known compared to their southern counterparts (Agou-Ahito and Akuse/Shai Massifs; [13][14][15][16][17][18][19][20][21]). Petrological and geochemical studies done one these rocks are incomplete.…”

Section: Introductionmentioning

confidence: 99%

Structural Organization and Tectono-Metamorphic Evolution of the Pan-African Suture Zone: Case of the Kabye and Kpaza Massifs in the Dahomeyide Orogen in Northern Togo (West Africa)

Tairou¹,

Affaton²

2013

IJG

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The Kabye and Kpaza Massifs correspond to two main granulitic suites in the suture zone of the Pan-African Dahomeyide orogenic belt, in northern Togo. The Kabye Massif is composed of an important west verging nappe pile subdivided into two petrographic units. The nappes in its western petrographic unit are made up of leucocratic garnetbearing granulites defined as the "Lassa-Soumdina Granulites" (GLS). The eastern petrographic unit consists of melanocratic granulites, with metagabbroic structures, called the "Ketao-Sirka Granulites" (GKS). These two petrographic units are separated by the Panalo Mylonitic Zone (ZMP). This major west verging zone includes a syn-Dn + 2 dextral shear contact. The Kpaza Massif comprises nappes of melanocratic granulites (GKM), comparable to the GKS of the Kabye Massif. All these granulitic nappes include boudins of pyroxenites or meta-anorthosites, and ultramafic rocks represented by serpentinites, talcschists, actinolite-and chlorite-schists which generally mark thrust soles. The GLS nappes are thrust over the Kara-Niamtougou orthogneissic unit (UKN) which is considered as the easternmost structural unit of the Dahomeyide external zone. On the other hand, the GKS nappes underlie those of the Binah meta-volcano sedimentary Complex (CB) which belongs to the Dahomeyide internal zone. As regards the Kpaza Massif, it occurs as a geologic window tectonically enclosed in the Mono Complex nappes (CM) corresponding to the southern part of the CB. The organization of the Kabye and Kpaza Massifs, as west verging nappe piles, and their relationships with the surrounding structural units express the tangential and folding tectonics that structured the Pan-African belt in northern Togo. The microstructures and mineral parageneses of the granulites and associated rocks in these two massifs indicate a polyphase tectono-metamorphic evolution: a syn-Dn granulitization (collision phase); a syn-Dn + 1 amphibolitization (obduction or tangential phase); and a syn-to post-Dn + 2 greenschist facies retrogressive metamorphism (post-nappe folding phase).

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The eclogites of the Lato hills, south Togo, West Africa: Relics from the early tectonometamorphic evolution of the Pan-African orogeny

Cited by 30 publications

References 21 publications

Pan-African granulite formation in the Kabye Massif of northern Togo (West Africa): Pb−Pb zircon ages

Pan-African granulite formation in the Kabye Massif of northern Togo (West Africa): Pb−Pb zircon ages

Blueschists and Eclogites of the World and Their Exhumation

Structural Organization and Tectono-Metamorphic Evolution of the Pan-African Suture Zone: Case of the Kabye and Kpaza Massifs in the Dahomeyide Orogen in Northern Togo (West Africa)

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