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A Summary of Progress in Petrography in

A Summary of Progress in Petrography in


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This historic book may have numerous typos or missing text. Not indexed. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. 1890. Not illustrated. Excerpt: ... MINERALOGY AND PETROGRAPHY.1 The Eruptives of Cabo-de-Gata.--The eruptive rocks of the Cabo-de-Gata region in southeastern Spain are pumiceous, glassy and granular liparites, andesites, dacites and an occasional basanite. The liparites are rare as fragments in a liparitic tufa and as small dykes cutting the fragraental rocks. The dacites cover a large stretch of country. They are the most abundant types in the region, and are developed in great variety. Two principal groups are distinguished. The first is characterized by the abundance of its phenocrysts, among which are large hornblendes, and by the possession of augite and hypersthene. Augite occurs in their grpundmass, quartz is scarce, and their feldspar is almost exclusively plagioclase. In the second group phenocrysts are less common. Biotite is the predominant colored constituent. Quartz and sanidine are both plentiful and the rock thus verges toward the liparites. All the components of these dacites have been very minutely described by Osann., But few of them present special peculiarities. The most interesting features connected with them are the alteration of hornblende into pyroxene and the intergrowth of augite and bronzite, with the pinacoids and prisms of the two minerals parallel. The andesites, which are best developed in the southern and southeastern parts of the region, are hornblendic and biotitic varieties. A mica andesite from the Rambla del Esparto contains an enormous number of granular inclusions composed of cordierite (?) biotite, spinel, sillimanite, corundum, andalusite, plagioclase, rutile, zircon, garnet, quartz and apatite. They are regarded as having resulted from the metamorphism of blocks brought from below, and the crystallization of andesite components upon them. The spine...


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Product Details
  • ISBN-13: 9781235461279
  • Publisher: General Books
  • Publisher Imprint: General Books
  • Height: 246 mm
  • No of Pages: 164
  • Spine Width: 9 mm
  • Width: 189 mm
  • ISBN-10: 1235461270
  • Publisher Date: 17 Jan 2012
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 304 gr

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