The Journal of the Japanese Association of Mineralogists, Petrologists and Economic Geologists
Online ISSN : 1883-0765
Print ISSN : 0021-4825
ISSN-L : 0021-4825
Search
Advanced search
OR
Browse
Search
Volume 69, Issue 4
Displaying 1-4 of 4 articles from this issue
Show all abstracts
    • |<
    • <
    • 1
    • >
    • >|
  • A NEW GRAPHIC REPRESENTATION FOR CALCIFEROUS AND SUBCALCIFEROUS AMPHIBOLES SOLID SOLUTION
    MICHIO TAGIRI, HITOSHI ONUKI
    1974 Volume 69 Issue 4 Pages 129-136
    Published: April 05, 1974
    Released on J-STAGE: August 07, 2008
    DOIhttps://doi.org/10.2465/ganko1941.69.129
    JOURNAL FREE ACCESS
    Show abstractHide abstract
    A new graphic method for calciferous and subcalciferous amphiboles is proposed on the basis of the electric neutrality of a crystal. The nine basic types of the cation-substitutions are discussed with the diagram which is constructed by the three axes of (A1++X1+), (Y3++Z3+)/4 and (X2++Y2++Z4+)/15. The solid solution of calciferous and subcalciferous amphiboles can be derived from the triply composite substitution constructed by 2 (X2+, Y2+)_??_(A1+, X1+)+Y3+, Z4+_??_(A1+, X1+)+Z3+ and (X2+, Y2+)+Z4+_??_Y3++Z3+, mainly. In the new graphic representation, there exist compositional gaps in the actinolitehornblende solid solution and in the subcalciferous amphibole solid solution under metamorphic conditions. When X2++Y+Z=15, calciferous amphiboles with Y3++Z3+=1.34-1.50 do not appear in nature. The compositional gap does not exist between calcic and subcalcic hornblende solid solution, but the gap between calcic and subcalcic actinolite solid solution may exist.
    On the basis of the consideration by the new graphic method, if the host rock compositions are in isochemical, metamorphic amphiboles change the variation trend of their compositional range according to the progressive mineral facies changes.
    View full abstract
    Download PDF (330K)
  • GATUZOYAMA GNEISSES ALONG THE MEDIAN TECTONIC LINE, TAKATO AREA, CENTRAL JAPAN
    AKIRA ONO
    1974 Volume 69 Issue 4 Pages 137-146
    Published: April 05, 1974
    Released on J-STAGE: August 07, 2008
    DOIhttps://doi.org/10.2465/ganko1941.69.137
    JOURNAL FREE ACCESS
    Show abstractHide abstract
    [in Japanese]
    View full abstract
    Download PDF (1066K)
  • AN INTERSTRATIFIED MINERAL OF MICA AND MONTMORILLONITE FOUND IN AN ALTERED TUFF
    KATSUTOSHI TOMITA, MITSUHIKO DOZONO
    1974 Volume 69 Issue 4 Pages 147-154
    Published: April 05, 1974
    Released on J-STAGE: August 07, 2008
    DOIhttps://doi.org/10.2465/ganko1941.69.147
    JOURNAL FREE ACCESS
    Show abstractHide abstract
    An interstratified mineral of mica and montmorillonite was found in the hydrothermally altered tuff in the Kagowara area of southern part of Kagoshima Prefecture, Japan. The mineral has a 27.14 Å of (001) reflection and it expanded to 29.4 Å by treatment with ethylene glycol. The 27.14 Å reflection moved to 10 Å after heating to 800°C The mineral has interstratified structure of mica and montmorillonite having two layers of water molecules between silicate layers. The probability parameters defining the structure can be shown as: PA (mica layer existing probability)=0.60, PB (montmorillonite layer existing probability)=0.40, PAA (probability that A succeeds A)=0.33, PAB=0.67, PBA=1.0 and PBB=0.0.
    View full abstract
    Download PDF (981K)
  • [title in Japanese]
    1974 Volume 69 Issue 4 Pages 155-166
    Published: 1974
    Released on J-STAGE: July 13, 2012
    DOIhttps://doi.org/10.2465/ganko1941.69.155
    JOURNAL FREE ACCESS
    Download PDF (1171K)
    • |<
    • <
    • 1
    • >
    • >|
feedback
 Top