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Petrology and mineralogy of dredged gabbro from Gettysburg Bank, eastern Atlantic

Prichard, Hazel Margaret and Cann, J. R. 1982. Petrology and mineralogy of dredged gabbro from Gettysburg Bank, eastern Atlantic. Contributions to Mineralogy and Petrology 79 (1) , pp. 46-55. 10.1007/BF00376960

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Gabbros have been dredged from Gettysburg Bank, 110 km west of Portugal on the Azores/Gibraltar fracture zone. Primary minerals in olivine, pyroxene and brown hornblende gabbros are partially replaced by metamorphic minerals. Igneous textures are inhomogeneously overprinted by a granular polyhedral deformation and a cataclastic deformation. Amphiboles show characteristics which indicate a transition from crystallisation in a magma chamber to formation of amphibole in solid gabbro under metasomatic conditions. Of the amphiboles analysed, chlorine was present in the green amphiboles but below 0.05% in the brown suggesting the penetration of sea water after the formation of the brown amphibole but during the formation of the green.

Item Type: Article
Status: Published
Schools: Earth and Ocean Sciences
Subjects: Q Science > QE Geology
ISSN: 0010-7999
Last Modified: 10 Oct 2017 13:20

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