The geological history of Maio, Cape Verde Islands

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doi: 10.1144/gsjgs.139.3.0347
Authors:Stillman, C. J.; Furnes, Harald; Le Bas, M. J.; Robertson, Alastair H. F.; Zielonka, J.
Author Affiliations:Primary:
Trinity Coll., Dep.Geol., Dublin, Ireland
Other:
Geol. Inst. Bergen, Norway
Univ. Leicester, United Kingdom
Grant Inst.Geol., United Kingdom
Volume Title:Journal of the Geological Society of London
Source:Journal of the Geological Society of London, 139(3), p.347-361. Publisher: Geological Society of London, London, United Kingdom. ISSN: 0016-7649
Publication Date:1982
Note:In English. 1 p. refs. Geol. map 1:50,000; illus. incl. 1 table, geol. sketch map
Summary:The oldest igneous rocks on Maio are pillow lavas of mid-ocean ridge pillow-basalt character which were tilted and uplifted to outcrop as a partial ring, dipping away steeply from a central plutonic complex of pyroxenites, essexites, syenites and carbonatites. The ocean-floor volcanic rocks are overlain conformably by a continuous pelagic carbonate succession indicating a shallowing depositional environment from Upper Jurassic to Upper Cretaceous times, when tuffaceous beds indicate renewed volcanism. Later deformation under compressive stress resulted in folding and thrusting and the intensive injections of major sills. After a hiatus in the Palaeogene, ankaramitic hyaloclastite and lava deltas occur, overlain by an extensive plateau of silica-undersaturated lavas, olivine melilitites and nephelinites, and thick ankaramitic lavas. [R.A.H.]
Subjects:Carbonate rocks; Cenozoic; Cretaceous; Faults; Igneous rocks; Islands; Jurassic; Lava; Mesozoic; Mid-ocean ridges; Petrology; Pillow lava; Sedimentary rocks; Stratigraphy; Structural geology; Tertiary; Unconformities; Upper Jurassic; Volcanic rocks; Africa; Atlantic Ocean Islands; Cape Verde Islands; Batalha Formation; Carqueijo Formation; Casas Velhas Formation; Coruja Formation; Maio; Malhada Pedra Formation; Morro Formation; Pedro Vaz Formation; Penoso Formation; Geologic map
Abstract Numbers:83M/0824
Record ID:1984029018
Copyright Information:GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United Kingdom, Twickenham, United Kingdom, Reference includes data from PASCAL, Institute de l'Information Scientifique et Technique
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