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Geological Society, London, Special Publications; 2008; v. 297; p. 147-167;
DOI: 10.1144/SP297.7
© 2008 Geological Society of London

The Palaeoproterozoic terranes from the West African craton and their reworking

First report of ultrahigh-temperature sapphirine + spinel + quartz and orthopyroxene + spinel + quartz parageneses discovered in Al–Mg granulites from the Khanfous area (In Ouzzal metacraton, Hoggar, Algeria)

Z. Adjerid1, K. Ouzegane2, G. Godard3 & J. R. Kienast4

1 Ecole Normale Supérieure, B.P. 92, Vieux Kouba, 16500 Alger, Algérie (e-mail: zouhir.adjerid{at}gmail.com)
2 Laboratoire de Géodynamique, Géologie de l'Ingénieur et de Planétologie, FSTGAT–USTHB, B.P. 32 El Alia, Dar el Beida, 16111 Alger, Algérie
3 Equipe Géobiosphère actuelle et primitive, CNRS IPGP, Université Denis-Diderot (Paris 7), case 89, 4 place Jussieu, 75252 Paris, France
4 Laboratoire de Géosciences marines, IPGP, universitié Denis-Diderot (Paris 7), case 89, 4 place Jussieu, 75252 Paris, France

The Archaean to Palaeoproterozoic Khanfous area from the Archaean In Ouzzal granulite terrane (Western Hoggar, Algeria) preserves exceptional thermal-peak (1150<T < 1300 °C) mineral parageneses, consisting of orthopyroxene+spinel+quartz, sapphirine+spinel+quartz and sapphirine+orthopyroxene+quartz, in quartz-rich Al–Mg granulites. Reaction textures coupled with P–T FMASH pseudosections indicate that rocks experienced complex multi-stage evolution. Our results suggest that the Khanfous area, as well as the entire northern In Ouzzal metacraton, experienced ultrahigh-temperature crustal metamorphism attributed to a 2 Ga Palaeoproterozoic event, followed by exhumation along a clockwise P–T path. The extreme temperatures attained suggest delamination of the lithosphere and ascent of the asthenosphere after crustal thickening.





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A. Bendaoud, K. Ouzegane, G. Godard, J.-P. Liegeois, J.-R. Kienast, O. Bruguier, and A. Drareni
Geochronology and metamorphic P-T-X evolution of the Eburnean granulite-facies metapelites of Tidjenouine (Central Hoggar, Algeria): witness of the LATEA metacratonic evolution
Geological Society, London, Special Publications, 2008; 297: 111 - 146.
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