A dynamic interpretation of Tristan da Cunha Volcano, South Atlantic Ocean

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doi: 10.1016/0377-0273(87)90091-6
Authors:Chevallier, L.; Verwoerd, Wilhelm J.
Author Affiliations:Primary:
Univ. Stellenbosch, Dep. Geol., Stellenbosch, South Africa
Volume Title:Journal of Volcanology and Geothermal Research
Source:Journal of Volcanology and Geothermal Research, 34(1-2), p.35-49. Publisher: Elsevier, Amsterdam, Netherlands. ISSN: 0377-0273
Publication Date:1987
Note:In English. 40 refs.; illus. incl. sects., block diags., geol. sketch maps
Summary:New and previously published data are used to produce a model of the internal structure of this volcano. Activity is characterized by a dual feeding system, the central activity occurring at the summit. The pyroclastic deposits, partly of hydrovolcanic origin, contributed to the building up of a well-developed central cone; radial dykes were generated by hydraulic fracturing. Strombolian lateral activity of scoria cones and flows occurred on the lower flanks. The pattern of Strombolian vents around the base of the central cone is ascribed to conical shear planes in depth caused by uplift of the roof of the magma chamber. There are also lateral vents along radial fractures which seem to be concentrated along two tectonic axes parallel the compressive axes of the stress field in the ocean floor. Segmented en echelon dykes and fissures are related to slope instability. [R.E.S.]
Subjects:Geomorphology; Interpretation; Landform description; Observations; Volcanic features; Volcanoes; Volcanology; Atlantic Ocean; Atlantic Ocean Islands; Mid-Atlantic Ridge; Tristan da Cunha; Inaccessible Island; Nightingale Island
Abstract Numbers:88M/4590
Record ID:1988014740
Copyright Information:GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United Kingdom, Twickenham, United Kingdom
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