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The petrogenesis of the Edough muscovite orthogneisses, Annaba, northeast Algeria

Ahmed-Said, Y. and Leake, Bernard Elgey 1995. The petrogenesis of the Edough muscovite orthogneisses, Annaba, northeast Algeria. Journal of African Earth Sciences 21 (2) , pp. 253-269. 10.1016/0899-5362(95)00071-Z

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The Edough muscovite orthogneisses, which are restricted to the lower part of a tectonic slice of andalusite metapelites and predate the doming of the massif, are well differentiated, S-type metagranites generated by 10–30% partial melting followed by 50–60% fractional crystallization of a melt derived from the structurally underlying biotite gneisses or a crustal material of a similar composition. These metagranites predate the M3 Tertiary metamorphism, were isochemically metamorphosed, tectonically emplaced and preserve syn-collisional affinities and hence are believed to have formed at the end of the M2 metamorphism. The composition of these metagranites and that of the 16-15 Ma post M3 Edough igneous rocks are then used to discuss the tectonic evolution of the Edough metamorphic core complex.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Earth and Environmental Sciences
Publisher: Elsevier
ISSN: 1464-343X
Last Modified: 04 Jun 2017 08:12

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