This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1915 edition. Excerpt: ... the albite and epidote-zoisite type of alteration products are closely interwoven, the combination is called saussurite. Where the hornblende is in more or less fibrous form with peripheral or radial arrangement relative to the original augite, it is called uralite. Olivine changes to tremolite, ...
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This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1915 edition. Excerpt: ... the albite and epidote-zoisite type of alteration products are closely interwoven, the combination is called saussurite. Where the hornblende is in more or less fibrous form with peripheral or radial arrangement relative to the original augite, it is called uralite. Olivine changes to tremolite, anthophyllite and talc. On considering the chemistry of these changes, it appears that they are all in the direction of breaking down of complex molecules. Calcium salts separate as by-products of almost every change, as for instance from augite to hornblende, hornblende to chlorite, from basic feldspar to acid feldspar and its by-products. These calcium salts may remain as silicates or as carbonates or may be carried off. Water is introduced, for the amphiboles, chlorites, and micas are hydrous as compared with the augites and feldspars. Chemical analyses illustrating this change are rare. Those published by Williams 1 seem to be of the best selected, but even these rocks are more or less weathered. All available pairs of analyses are summarized on Plate XIII. Such as they are, they seem to indicate a loss of calcium, a gain of water, and perhaps a slight gain of soda and potassium. Following is a list of references to the analyses platted: 1. 1 Gabbro, Michigan. Williams, G. H., Bull. 62, U. S. Geol. Survey, la I p. 76. 2. Greenstone, Michigan. Williams, G. H., Bull. 62, U. S. Geol. Survey, p. 91. 3. Gabbro diorite, Michigan. Williams, G. H., Bull. 62, U. S. Geol. Survey, p. 89. 4. Granitoid gneiss, southwestern Minnesota, Hall, C. W., Bull. 157, U. S. Geol. Survey, p. 68. 5. Greenstone, Marquette district, Michigan. Leith, C. K., unpublished analyses. Dynamic alteration of acid igneous rocks usually produces hornblendic, micaceous, chloritic...
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Add this copy of Metamorphic Geology: a Text-Book to cart. $67.27, good condition, Sold by Bonita rated 4.0 out of 5 stars, ships from Newport Coast, CA, UNITED STATES, published 2010 by Nabu Press.
Add this copy of Metamorphic Geology: a Text-Book to cart. $73.41, good condition, Sold by Bonita rated 4.0 out of 5 stars, ships from Newport Coast, CA, UNITED STATES, published 2016 by Palala Press.
