(Baronnet et al., EURESCO, 2005)
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Transcript of (Baronnet et al., EURESCO, 2005)
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(Baronnet et al., EURESCO, 2005)
TALC SERPENTINE
Mg(OH)2
b=9.3A
SiO4
b=8.7A
SHEET SILICATESSHEET SILICATES
(sandwich)(sandwich) (toast)(toast)
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antigorite
Cross section of a chrysotile tubuleCross section of a chrysotile tubuleJeol 3010/CRMC2Jeol 3010/CRMC2
10 nm
chrysotile
SERPENTINESSERPENTINES
Lamelles // (001)Optique: allongement +
Tubes // [010]Optique: fibres allongement +
Images microscopie électronique haute résolution A. Baronnet
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LAME AUXILLIAIRE (GYPSE)Superposée à ng => teinte monteSuperposée à np => teinte descend
N’gngnp
ng
np
+
-
RAPPEL D’OPTIQUE CRISTALLINE
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Antigorite lamellaireAntigorite lamellaire
N’g
Moses Rocks, Colorado(60% altération)
LP LP + lame onde
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N’g
Antigorite lamellaireAntigorite lamellaire Moses Rocks, Colorado
LP + GYPSELP
olivine
antigorite
antigorite
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100µm
N’g
Antigorite maillée (mesh)Antigorite maillée (mesh) Site cuprifère, ophiolite d’Oman(90% altération)
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100µm
N’g
Antigorite maillée (mesh)Antigorite maillée (mesh) Site cuprifère, ophiolite d’Oman
(zoom)(zoom)
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CTEM dataCTEM data
relation 2(010)Olivine || (001)Antigorite
[001]Olivine || [010]Antigorite
relation 1(100)Olivine || (001)Antigorite
[001]Olivine || [010]Antigorite
Image A. Baronnet
Pourquoi? Parce que Antigorite et Olivine ont les relations topotactiques suivantes:Pourquoi? Parce que Antigorite et Olivine ont les relations topotactiques suivantes: