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The petrology, geochemistry and petrogenesis of the Edough igneous rocks, Annaba, NE Algeria.

Ahmed-Said, Y., Leake, B. E. and Rogers, G. 1993. The petrology, geochemistry and petrogenesis of the Edough igneous rocks, Annaba, NE Algeria. Journal of African Earth Sciences 17 (1) , pp. 111-123. 10.1016/0899-5362(93)90027-N

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Abstract

Microgranites and rhyolites of the Edough complex, Annaba, NE Algeria are described. Their petrology and geochemistry indicate that these calc-alkaline, probable Tertiary rocks, evolved by feldspar-dominated fractional crystallization of a basic magma. Trace elements and isotopic ratios of Sr (87Sr/86Sr16.0 = 0.71947−0.72404) and detailed petrogenetic modelling exclude the granites from being produced solely by simple crystal fractionation of a basaltic magma and the similarities of these ratios to those of the Edough biotite gneisses (87Sr/86Sr16.0 = 0.71840−0.73008) confirm a genetic link. We conclude that the Edough Tertiary magmatic rocks and perhaps many of the Tertiary igneous rocks of NE Algeria were produced by crystal fractionation of mantle-derived basaltic magma which subsequently assimilated substantial amounts of crustal material of the type Edough biotite gneisses.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Earth and Ocean Sciences
Publisher: Elsevier
ISSN: 1464-343X
Last Modified: 09 Jul 2020 15:31
URI: http://orca-mwe.cf.ac.uk/id/eprint/133076

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