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IV.—The Old Granites of the Transvaal and of South and Central Africa
Published online by Cambridge University Press: 01 May 2009
Extract
Just over three years ago I described the field relations, chemical composition, and petrographical characteristics of the Old, and also of the Newer, Red Granite of the Transvaal. As then, so now, I cannot do better than introduce this subject with the words of the late Charles Darwin — “Granite to the geologist is classic ground; from its widespread limits, and its beautiful and compact texture, few rocks have been more anciently recognized. Granite has given rise, perhaps, to more discussion concerning its origin than any other formation. We generally see it constituting the fundamental rock; and, however formed, we know it is the deepest layer in the crust of this globe to which man has penetrated”. South and Central Africa furnish no exception. Their granites, which are of astonishingly widespread occurrence, of varying and often characteristic texture, have been classic ground to geologists, as the numerous papers concerning them and their mode of origin and relative geological age well testify.
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References
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