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Title: The geochronology of Scottish Carboniferous volcanism
Author: de Souza, Hugh A. F.
Awarding Body: University of Edinburgh
Current Institution: University of Edinburgh
Date of Award: 1979
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The aims of this study were to determine the temporal relationships, using K-Ar dating, of the complex magmatic events which occurred in Scotland between the early Carboniferous and early Permian. Various aspects of Scottish Carboniferous geology are reviewed. The least altered whole-rock basalt samples have given reliable ages. Green alteration minerals in the basalts are liable to lose argon; they contain much of the sample atmospheric argon. Ten magmatic episodes have been recognised. The Carboniferous basic magmas became increasingly silica-undersaturatad with time and similar short term trends occurred within each episode. It is suggested that the magmatic cycle is the result of the growth, maturity and slow decline of a single mantle thermal event. The tectonic setting of Carboniferous magmatism in Scotland is examined in relation to the Hercynian orogeny; it is argued that it is analogous to the Cenozoic alkaline magmatism in East Asia, developed well to the rear of the Western Pacific island arcs.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available