File:The geology of Ascutney Mountain, Vermont (1903) (14783541752).jpg

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Identifier: geologyofascutne00daly (find matches)
Title: The geology of Ascutney Mountain, Vermont
Year: 1903 (1900s)
Authors: Daly, Reginald Aldworth, 1871-1957
Subjects: Petrology
Publisher: Washington, Govt. Print. Off.
Contributing Library: Boston College Libraries
Digitizing Sponsor: Boston Library Consortium Member Libraries

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ematrix immediately surrounding, for in no case could there be founda zone about the nodule distinctly lighter in color than the normalrock. This is the more difficult to understand because of the veryevident lack of flow structure in the rock as a whole. The nodulesseem to have formed quietly in the magma after it had suffered itsmise en place and not to have been disturbed in position since.Even those which are decidedly elongated do not shoAv the degree ofcommon orientation which we should expect if they had floated in astreaming fluid matrix. The nodular masses are themselves porphyritic. Large, irregularlybounded crystals of microperthite, cryptoperthite, microcline, ortho-clase and plagioclase (averaging acid labradorite AbiAnJ, green horn-blende, and the usual diopsidic augite, with or without a hornblendemantle, form the phenocrysts (see PL V, B). The dark matrix is afine-grained granular, panallotriomorphic mass of hornblende, oligo- aBuU. Geol. Soc. Am., Vol. I, 1890, p. 30.
Text Appearing After Image:
DALY.) BASIC SEGEEGATIONS IN MAIN SYENITE. 65 clase, biotite, and quartz, with abundant grains or idioraorphic crys-tals of titanite, ilmenite, apatite, and zircon. The microperthite andlabradorite of the phenocrysts and the hornblende, biotite, and oligo-clase of the groundmass are really the essential constituents. Thepleochroism of the hornblende seems to indicate that it is less alka-ine than the amphibole of the matrix. a, pale yellowish green. b, grayish green (absorption medium to strong). c, grass-green to leek-green (absorption medium to strong).b = c > a. As already noted above, these segregations characteristically containlight-colored, coarsely crystalline areas from 1 to 2 centimeters indiameter, similar in composition to the normal syenite of phase /, i. e.equigranular aggregates of alkali-feldspar and bisilicates. Thesehave the appearance of having functioned as centers of crystallizationduring the growth of the nodule, although there is a complete absenceof both rad

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Author Daly, Reginald Aldworth, 1871-1957
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Flickr tags
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  • bookid:geologyofascutne00daly
  • bookyear:1903
  • bookdecade:1900
  • bookcentury:1900
  • bookauthor:Daly__Reginald_Aldworth__1871_1957
  • booksubject:Petrology
  • bookpublisher:Washington__Govt__Print__Off_
  • bookcontributor:Boston_College_Libraries
  • booksponsor:Boston_Library_Consortium_Member_Libraries
  • bookleafnumber:76
  • bookcollection:Boston_College_Library
  • bookcollection:blc
  • bookcollection:americana
  • BHL Collection
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30 July 2014
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