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Site 253, Leg 26, D.S.D.P., Ninety East Ridge (90° E Ridge; Indian Ridge), Indian Ocean

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Lat. 24°52, 65' S
Long. 87°21, 97' E

Middle Eocene hyaloclastites, glass ashes and lapillis (405 meters thick) under 153 meters of carbonate sediments.
Hydrothermal alteration in HT geothermal area (200°C/kh).





 Map Reference: 24°31'S , 87°13'E

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Mineral List:
  		•  Albite
    var: Andesine
    (Na,Ca)[Al(Si,Al)Si
     
    2
    		O
     
    8
    		]
    Description: Detritic phase.
    Reference: [D. Besse et al. , Bell. Minéral. , 1981, 104, pp. 56-63.]
  		•  Analcime
    Na
     
    2
    		[Al
     
    2
    		Si
     
    4
    		O
     
    12
    		] · 2H
     
    2
    		O
    Description: Basal Unit.
    Reference: [D. Besse et al. , Bell. Minéral. , 1981, 104, pp. 56-63.]
  		•  Beidellite
    (Na,Ca
     
    0.5
    		)
     
    0.3
    		Al
     
    2
    		(Si,Al)
     
    4
    		O
     
    10
    		(OH)
     
    2
    		·nH
     
    2
    		O
    Description: Fe-rich beidellite (Upper Unit).
    Reference: [D. Besse et al. , Bell. Minéral. , 1981, 104, pp. 56-63.]
  		•  Calcite
    CaCO
     
    3
    Reference: [D. Besse et al. , Bell. Minéral. , 1981, 104, pp. 56-63.]
  		•  Celadonite
    K(Mg,Fe
    2+
     
    		)(Fe
    3+
     
    		,Al)[(OH)
     
    2
    		|Si
     
    4
    		O
     
    10
    		]
    Description: Upper and Basal Units.
    Reference: [D. Besse et al. , Bell. Minéral. , 1981, 104, pp. 56-63.]
  		•  'Chlorite Group'
    Description: Basal Unit.
    Reference: [D. Besse et al. , Bell. Minéral. , 1981, 104, pp. 56-63.]
  		•  'Clinoptilolite'
    Reference: [D. Besse et al. , Bell. Minéral. , 1981, 104, pp. 56-63.]
  		•  Clinoptilolite-Ca
    (Ca,Na,K)
     
    2-3
    		Al
     
    3
    		(Al,Si)
     
    2
    		Si
     
    13
    		O
     
    36
    		·12H
     
    2
    		O
    Description: Upper and Middle Unit.
    Reference: [D. Besse et al. , Bell. Minéral. , 1981, 104, pp. 56-63.]
  		•  Clinoptilolite-Na
    (Na,K,Ca)
     
    2-3
    		Al
     
    3
    		(Al,Si)
     
    2
    		Si
     
    13
    		O
     
    36
    		·12H
     
    2
    		O
    Description: Basal Unit.
    Reference: [D. Besse et al. , Bell. Minéral. , 1981, 104, pp. 56-63.]
  		•  Cristobalite
    SiO
     
    2
    Description: Opal CT lepispheres.
    Reference: [D. Besse et al. , Bell. Minéral. , 1981, 104, pp. 56-63.]
  		•  Illite
    K
     
    0.65
    		A
     
    2.0
    		 [][Al
     
    0.65
    		Si,
     
    3.35
    		O
     
    10
    		](OH)
     
    2
    Description: Upper and Basal Units.
    Reference: [D. Besse et al. , Bell. Minéral. , 1981, 104, pp. 56-63.]
  		•  'K Feldspar'
    Description: Authigenetic phase.
    Reference: [D. Besse et al. , Bell. Minéral. , 1981, 104, pp. 56-63.]
  		•  Mordenite
    (Na
     
    2
    		,Ca,K
     
    2
    		)Al
     
    2
    		Si
     
    10
    		O
     
    24
    		·7H
     
    2
    		O
    Description: Middle Unit.
    Reference: [D. Besse et al. , Bell. Minéral. , 1981, 104, pp. 56-63.]
  		•  Opal
    SiO
     
    2
    		·nH
     
    2
    		O
    Description: Opal CT lepispheres.
    Reference: [D. Besse et al. , Bell. Minéral. , 1981, 104, pp. 56-63.]
  		•  'Phillipsite'
    Description: Upper Unit.
    Reference: [D. Besse et al. , Bell. Minéral. , 1981, 104, pp. 56-63.]
  		•  Quartz
    SiO
     
    2
    Reference: [D. Besse et al. , Bell. Minéral. , 1981, 104, pp. 56-63.]
  		•  Saponite
    Ca
     
    0.25
    		(Mg,Fe)
     
    3
    		(Si,Al)
     
    4
    		O
     
    10
    		(OH)
     
    2
    		·nH
     
    2
    		O
    Description: Fe-rich saponite (Basal Unit).
    Reference: [D. Besse et al. , Bell. Minéral. , 1981, 104, pp. 56-63.]
  		•  'Smectite Group'
    A
     
    0.3
    		D
     
    2-3
    		[T
     
    4
    		O
     
    10
    		]Z
     
    2
    		·nH
     
    2
    		O
    Description: Mixed-layer (interstratified) illite/smectite phases. Basal Unit.
    Reference: [D. Besse et al. , Bell. Minéral. , 1981, 104, pp. 56-63.]


    18 entries listed. 12 valid minerals.

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