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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; Morishita and S. Arai, Journal of Petrology, 2001, V 42, N 7, pp. 1279-1299.

Complex peridotite body, with three peridotite suites :
1) Harzburgite / lherzolite suite
2) Banded dunite / harzburgite suite (cumulate)
3) Spinel-rich dunite / wehrlite suite (cumulate)

The structure of the peridotite body is layered, two main zones have been distinguished :
- Upper zone (600 meter thick) : Core of an ascending mantle diapir (with thermal gradient), with plagioclase lherzolites and harzburgites, and mafic layers.
- Lower zone (2200 meter thick) : Margin of an ascending mantle diapir, with cyclic layers plagioclase lherzolite/lherzolite/harzburgite/dunite/harzburgite/lherzolite/plagioclase lherzolite (with mafic layers).

The garnet peridotite (830 Ma) grades into a plagioclase peridotite during ascension.

The Horoman peridotite is a MORB-related oceanic mantle subsided to deeper mantle depth, before crustal ascension and emplacement (23 Ma).




Mineral list contains entries from the region specified including sub-localities

Group 2 - Sulphides and Sulfosalts
  		• Horomanite (TL)2.BB.
    Fe
     
    6
    		Ni
     
    3
    		S
     
    8
  		• Samaniite (TL)2.BB.
    Cu
     
    2
    		Fe
     
    5
    		Ni
     
    2
    		S
     
    8
    Group 4 - Oxides and Hydroxides
  		• Chromite4.BB.05
    FeCr
     
    2
    		O
     
    4
  		• Corundum4.CB.05
    Al
     
    2
    		O
     
    3
  		• Hercynite
    var: Picotite    		4.BB.05
    (Fe,Mg)(Al,Cr)
     
    2
    		O
     
    4
  		• Ilmenite4.CB.05
    Fe
    2+
     
    		TiO
     
    3
  		• Magnetite4.BB.05
    Fe
    2+
     
    		Fe
    3+
    2
    		O
     
    4
      var: Titaniferous Magnetite4.BB.05
    Fe
    2+
     
    		(Fe
    3+
     
    		,Ti)
     
    2
    		O
     
    4
  		• Spinel4.BB.05
    MgAl
     
    2
    		O
     
    4
    Group 9 - Silicates
  		• Anorthite9.FA.35
    Ca[Al
     
    2
    		Si
     
    2
    		O
     
    8
    		]
  		• Augite9.DA.15
    (Ca,Na)(Mg,Fe
    2+
     
    		,Al,Fe
    3+
     
    		,Ti)[(Si,Al)
     
    2
    		O
     
    6
    		]
  		• Diopside9.DA.15
    CaMg[Si
     
    2
    		O
     
    6
    		]
      var: Chromian Diopside9.DA.15
    (Ca,Cr)MgSi
     
    2
    		O
     
    6
  		• Enstatite9.DA.05
    Mg
     
    2
    		[SiO
     
    3
    		]
     
    2
      var: Bronzite9.DA.05
    (Mg,Fe
    2+
     
    		)
     
    2
    		[SiO
     
    3
    		]
     
    2
  		• Forsterite9.AC.05
    Mg
     
    2
    		[SiO
     
    4
    		]
  		• Kaersutite9.DE.15
    [Na][Ca
     
    2
    		][Mg
     
    4
    		Ti][O|OH|Al
     
    2
    		Si
     
    6
    		O
     
    22
    		]
  		• Pargasite9.DE.15
    [Na][Ca
     
    2
    		][Mg
     
    4
    		Al][(OH)
     
    2
    		|Al
     
    2
    		Si
     
    6
    		O
     
    22
    		]
  		• Phlogopite9.EC.20
    KMg
     
    3
    		[(OH,F)
     
    2
    		|AlSi
     
    3
    		O
     
    10
    		]
  		• Pyrope9.AD.25
    Mg
     
    3
    		Al
     
    2
    		[SiO
     
    4
    		]
     
    3
    Unclassified Minerals
  		• 'Albite-Anorthite Series'-
  		• 'Clinopyroxene Subgroup'-
  		• 'Orthopyroxene Subgroup'-
  		• 'Serpentine Group'-
    D
     
    2
    		[Si
     
    2
    		O
     
    5
    		](OH)4 + or - nH
     
    2
    		O


    24 entries listed. 20 valid minerals.

    Localities in this Region:
    Japan
     
    • Hokkaido Island
      • Hidaka Province
        • Samani-gun
          • Samani-cho
            • Horoman peridotite body

    The above list contains all mineral locality references listed on mindat.org. This does not claim to be a complete list. If you know of more minerals from this site, please register so you can add to our database!
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