File:The geology of Ascutney Mountain, Vermont (1903) (14780739751).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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cised bj^ the country rock on the eruptive. Basic nodules, from 1 to 2 inches (2.(3 to 5.2 centimeters) in diameterare occasionally seen in the quarry rock. They are differentiated min-eralogically from their parent rock simply by a greater richness inhornblende, which is here, too, strikingly corroded. One can not besure that the poikilitic habit of the mineral is anything more thanapparent; primarj^ inclusion of quartz and feldspar might give thesame appearance in thin section as that due to extensive embaying ofthe hornblende by the caustic feldspathic magma. PLATE IV. A. Typical thin section of the nordmarkite of the Main stock, granitic phase,composed ahnost entirely of microperthite and qixartz; crossed nicols, X 30. (Seep. 50.) B. Pyroclastic feldspar (soda-orthoclase) surrounded by a reaction rim rich inalkaline hornblende, from the large paisanite dike on northwest slope of AscutneyMountain; crossed nicols, X 7. (See p. 71.) 58 U. S. GEOLOGICAL SURVEY BULLETIN NO. 209, PL. IV
Text Appearing After Image:
(B) HE MERIDEN GRAVURE CO. DALY.) MAIN SYENITE STOCK. Table YII.—Analyses of nordmarkite and other rocks. 59 1. 2. 3. 4. 5. 60.03 20.76 j 4.01 1 0.75 0.80 2.62 5.96 5.48 a 0. 59 6. 7. 8. SiOa -- 65.4316.111,152.850.401.495.005.970.390.19Trace?0.500.110.13None.0.050.080.070.030.23Trace. 64.88 16.241.372.700.891.925.005.610.460.19 None.0.690.130.13 None.0.040.08 64.0417.920.962.080.591.006.676.08 i 1.18 60.4520.14 ( 3. 80 1.271.687.235.12 0.71 60.5-67.020.0-17.5 U. 0- 3.0 1.0- 0.52.0- 1.57.0- 6.55.0- 6.0 61.4916.14 5.81 0.991.676.195.70 «1.17 65.43 16.96 ( 1.55 1 1.53 0 22 Al.Oa Fe-A FeO MgO- CaO 1 36 Na,0 5 95 K^O- H.,0 above 110° C. 5.36 0.82 HjO below 110° C_-COo None. TiOa 1 0.62 0.16 ZrO^ P2O, 0.07 0.53 0.02 SO3 0.06 CI 0.04 F FeSa BaO 0.060.14 Faint trace. Trace. None. MnO 0.23 Trace. 0.28 0.40 SrO LijO Stronsr trace. 100.180.04 100.530.04 101.37 100.40 100.07 99.97 99.86 0—F CI 100.140.0362.659 100.49 Totals - Sp.gr 2.683 a Loss on ignition. 1. Hornblende-biotite-nordmarki

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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:66
  • bookcollection:Boston_College_Library
  • bookcollection:blc
  • bookcollection:americana
  • BHL Collection
Flickr posted date
InfoField
30 July 2014


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