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Intraoceanic tectonism on the Gorringe Bank: observations by submersible

Auzende, J. M., Ceuleneer, G., Cornen, G., Juteau, T., Lagabrielle, Y., Lensch, G., Mevel, C., Nicolas, A., Prichard, Hazel Margaret, Ribeiro, A., Ruellan, E. and Vanney, J. R. 1984. Intraoceanic tectonism on the Gorringe Bank: observations by submersible. Geological Society, London, Special Publications 13 (1) , pp. 113-120. 10.1144/GSL.SP.1984.013.01.10

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The Gorringe Bank is a 200 km long structure, oriented NE-SW, located at the eastern end of the Azores-Gibraltar line, at the Europe-Africa boundary. It consists of two mounts, Mount Gettysburg at the SW (−25 m) and Mount Ormond at the NE (−100 m). Previous works have shown that it corresponds to a section in oceanic mantle and crust. A recent expedition of the submersible SP 3000 CYANA (May-June 1981) has allowed us: (i) to confirm that Mount Gettysburg essentially consists of largely serpentinized peridotites. The study of two oriented samples collected in situ allows some inferences about the kinematics of emplacement for these ultramafics; (ii) to show that Mount Ormond is mostly composed of various gabbros corresponding to different stages of differentiation. All the samples are more or less recrystallized and display strong deformation from high-temperature mylonitization to low-temperature brecciation. Such a ubiquitous deformation is not common in ophiolite complexes and may be linked with the location of the bank at the Europe-Africa plate boundary; (iii) to observe two generations of undeformed dykes cutting the Ormond gabbros: the first one of dolerites genetically linked with the gabbros, the second of alkaline rocks, feeders of the more recent alkaline volcanics capping the mount.

Item Type: Article
Status: Published
Schools: Earth and Environmental Sciences
Subjects: Q Science > QE Geology
ISSN: 0305-8719
Last Modified: 10 Oct 2017 13:20

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