Professional Paper - United States Geological Survey Volume 3 download

Professional Paper - United States Geological Survey Volume 3 by Geological Survey

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Author: Geological Survey
Page Count: 64 pages
Published Date: 01 Mar 2012
Publisher: Rarebooksclub.com
Publication Country: Miami Fl, United States
Language: English
ISBN: 9781130941920
File Name: Professional.Paper.-.United.States.Geological.Survey.Volume.3.pdf
Download Link: Professional Paper - United States Geological Survey Volume 3
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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. 1902 Excerpt: ...have a great abundance of well-defined plagioclase laths with fluidal arrangement, as well as innumerable augite microlites and octahedral crystals and grains of magnetite embedded in a base of these allotriomorphic patches of feldspar and of quartz (60. 61, ci'i. 71. 74). The augite microlites are, as a rule, somewhat larger and not quite so sharply developed as is the case in the other andesites. The phenocrysts of plagioclase. hypersthene, and augite differ in no essential respect from the descriptions given for all the Crater Lake andesites. Fig. 6" of Pl. XVI (p. 98) gives a fair idea of the allotriomorphic patches that characterize these holocrvstalline andesites. The presence of quartz in the groundmass of these rocks suggests a much more acid rock than the chemical analyses of Crater Lake andesites given elsewhere in these pages allow. As the only analysis made of this holocrystalline type is of No. (j8, which is not thoroughly representative, inasmuch as the allotriomorphic patches are not very well developed, it will be of interest to compare these rocks with a similar rock collected by Mr. Diller and alluded to by Mr. H. W. Turner in his article on the Age and Succession of the Igneous Rocks of the Sierra Nevada." The rock in question was token from Crater Peak, California (Lassen Peak quadrangle), and is No. 1829 of the Cascade Range collection. Mr. Turner does not describe the rock, but he refers to it as a pyroxene-andesite, and gives the chemical analysis made by W. F. Hillebrand. This analysis will be found repeated on page 94 of this paper. Through the kindness of Mr. Diller the writer was enabled to study a thin section of this Crater Peak andesite and to compare it with the thin sections of the rocks here under discussion. Witho...

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