This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1904 Excerpt: ...found rocks of various types, which may be regarded as effusive or marginal types of the above classes of deep-seated rocks. The typical red granite with micropegmatite structure is itself probably a marginal type (Bandfacies) of the very coarse-grained red granite without micropegmatite structure which I found in some ...
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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1904 Excerpt: ...found rocks of various types, which may be regarded as effusive or marginal types of the above classes of deep-seated rocks. The typical red granite with micropegmatite structure is itself probably a marginal type (Bandfacies) of the very coarse-grained red granite without micropegmatite structure which I found in some of the central portions of the Bushveld, as, for instance, in the vicinity of Zoutpan, twenty-four miles north of Pretoria. Segregation of the more basic elements is most marked both on a 1 I have found, somewhat rarely, red varieties of old granite in the Vredefort mass, and also in some localities of the Vryheid district. surrounding schists, segregations of large and a small scale. Thus one the more basic elements. finds amphibole in the red granite (which otherwise is rather poor in dark constituents) accumulated in masses of various dimensions, which should be designated amphibolites (hornblendefeh). The relative distribution and position of the red granites, syenites, norites, and metalliferous deposits in these norites can be attributed to phenomena of segregation (see further on). Crystalline schists well developed Crystalline schists are unknown throughout the area of the ancient in the area of the red granite, granite. They often form belts of great length, and in their vicinity the granite has frequently a pseudostratified structure, and is altered to gneissose and amphibolite varieties. Numerous diabase dykes. Diabase dykes wanting or rather rare. This table furnishes sufficient evidence of the fact that the old granite and the red 'granite show such fundamental differences that the one cannot be the equivalent to the other. It is, of course, almost impossible to confound them when one has seen them in the field and observed the c...
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Add this copy of Geology of the Transvaal to cart. $92.00, fair condition, Sold by Chapter 1 Books rated 5.0 out of 5 stars, ships from Johannesburg, SOUTH AFRICA, published 1904.
