Volcanoes: Past And Present
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A copy of one of these sketches is here given (Fig. 33), Fig. 33. — Section at Alt na Searmoin, Mull, to show the intrusion of felsite (or granophyre) {i) into basalt and dolerite (a) of the plateau- basalt series. — (Geikie.) according to which the felsite is shown to penetrate the basaltic sheets at Alt na Searmoin in Mull; other sections seen at Cruach Torr an Lochain, and on the south side of Beinn Fada, appear to lead to similar ' History of I'okaftic Action, etc., loc. cit. p. 153, et seq.... The " Granophyres" of Geikie come under the head of " Felsites," passing into "granite" in one direction and quartz-trachyte in another, ac- cording to Judd ; the proportion of silica from 69 to 75 per cent.— Quart. Jour. Geol. Soc, vol. xxx. p. 235.
176 VOLCANOES: PAST AND PRESENT.
conclusions. These rocks are penetrated by numerous basaltic dykes.
(c.) Representative Rocks of Mourne and Carling- ford, Ireland. — Assuming Sir A. Geikie's view to be correct, it is possible that we may have in the granite and quartz-porphyries of Mourne and Carlingford representatives of the granites, granophyres, and other acid rocks of the later period of Mull.
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To quickly assess the difficulty of the text, read a short excerpt:
A copy of one of these sketches is here given (Fig. 33), Fig. 33. — Section at Alt na Searmoin, Mull, to show the intrusion of felsite (or granophyre) {i) into basalt and dolerite (a) of the plateau- basalt series. — (Geikie.) according to which the felsite is shown to penetrate the basaltic sheets at Alt na Searmoin in Mull; other sections seen at Cruach Torr an Lochain, and on the south side of Beinn Fada, appear to lead to similar ' History of I'okaftic Action, etc., loc. cit. p. 153, et seq.... The " Granophyres" of Geikie come under the head of " Felsites," passing into "granite" in one direction and quartz-trachyte in another, ac- cording to Judd ; the proportion of silica from 69 to 75 per cent.— Quart. Jour. Geol. Soc, vol. xxx. p. 235.
176 VOLCANOES: PAST AND PRESENT.
conclusions. These rocks are penetrated by numerous basaltic dykes.
(c.) Representative Rocks of Mourne and Carling- ford, Ireland. — Assuming Sir A. Geikie's view to be correct, it is possible that we may have in the granite and quartz-porphyries of Mourne and Carlingford representatives of the granites, granophyres, and other acid rocks of the later period of Mull.
What to read after Volcanoes: Past And Present?
You can find similar books in the "Read Also" column, or choose other free books by Edward Hull to read onlineMoreLess
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