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Regarding the extent of the elliptical submarine base of the two-granite pluton of Scilly, the speaker asked why the authors had adopted 30 square miles for this plane area rather than the value of nearly 50 square miles suggested by available bathymetric data. Further, in view of the elliptical plan of the pluton, what new evidence was there for regarding the mass as a boss, with its implication of a nearly circular cross-section, instead of the laccolite first proposed by C. W. Osman or the asymmetrical laccolithic form suggested by the speaker (in D. L. Jones, Ph.D. Thesis, University of London, 1963), after a detailed structural study of the mass.
In connexion with two large supposed inclusions of the former sedimentary envelope of the mass in the first granite, on White Island, St Martin’s, had the authors any views on the ambiguous field and laboratory evidence associated with this question, particularly in respect of the dyke-like schistose and tourmalinized body concerned ?
In the two main granites, the authors had drawn attention to the
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This 250-word extract was created in the absence of an abstract.
