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Chromdiopside gabbroic granulite layer, Horoman peridotite body, Samani-cho, Samani-gun, Hidaka Province, Hokkaido Island, Japan

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Ref.: E. Takazawa et al. , Journal of Petrology, V 40, N 12, December 1999, pp. 1827-1851.

Type II layer : Chromdiopside mafic gabbroic granulites (plagioclase-rich cumulates of the upper mantle) (age : 830 Ma).
These mafic layers (mm to m thickness scale) are parallel to foliation plane of the peridotites.
The assemblages are due to subsolidus reaction.




Group 4 - Oxides and Hydroxides
  		• Magnetite4.BB.05
    Fe
    2+
     
    		Fe
    3+
    2
    		O
     
    4
  		• Spinel4.BB.05
    MgAl
     
    2
    		O
     
    4
    Group 9 - Silicates
  		• Diopside
    var: Chromian Diopside    		9.DA.15
    (Ca,Cr)MgSi
     
    2
    		O
     
    6
  		• Forsterite9.AC.05
    Mg
     
    2
    		[SiO
     
    4
    		]
  		• Pargasite9.DE.15
    [Na][Ca
     
    2
    		][Mg
     
    4
    		Al][(OH)
     
    2
    		|Al
     
    2
    		Si
     
    6
    		O
     
    22
    		]
    Unclassified Minerals
  		• 'Albite-Anorthite Series'-
  		• 'Clinopyroxene Subgroup'-
  		• 'Orthopyroxene Subgroup'-


    8 entries listed. 5 valid minerals.

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