How does olivine contribute to the formation of serpentinite?
How does olivine contribute to the formation of serpentinite?
Olivine is a solid solution between the magnesium-endmember forsterite and the iron-endmember fayalite. Serpentinite reactions 1a and 1b, below, exchange silica between forsterite and fayalite to form serpentine group minerals and magnetite. These are highly exothermic reactions.
What makes serpentine stable at a high pH?
Serpentine is stable at high pH in the presence of brucite like calcium silicate hydrate, (C-S-H) phases formed along with portlandite (Ca (OH) 2) in hardened Portland cement paste after the hydration of belite (Ca 2 SiO 4 ), the artificial calcium equivalent of forsterite. 2 Ca 2 SiO 4 + 4 H 2 O → 3 CaO · 2 SiO 2 · 3 H 2 O + Ca (OH) 2
What kind of fluid is involved in serpentinite formation?
Fluids involved in serpentinite formation commonly are highly reactive and may transport calcium and other elements into surrounding rocks; fluid reaction with these rocks may create metasomatic reaction zones enriched in calcium and called rodingites.
What kind of minerals are found in serpentine rocks?
A similar suite of reactions involves pyroxene-group minerals, though less readily and with complication of the additional end-products due to the wider compositions of pyroxene and pyroxene-olivine mixes. Talc and magnesian chlorite are possible products, together with the serpentine minerals antigorite, lizardite, and chrysotile.
What happens if you don’t have a serpentine belt?
Of course, until you obtain a new belt, be sure not to drive the car because with no serpentine belt driving the water pump, the car will overheat for sure and that can easily warp the cylinder head and/or engine block causing costly damage. Please note that the engine cooling thermostat can be damaged during an episode of overheating.
Fluids involved in serpentinite formation commonly are highly reactive and may transport calcium and other elements into surrounding rocks; fluid reaction with these rocks may create metasomatic reaction zones enriched in calcium and called rodingites .
How is serpentinization related to the formation of rocks?
Formation and petrology. Serpentinization is a geological low-temperature metamorphic process involving heat and water in which low-silica mafic and ultramafic rocks are oxidized (anaerobic oxidation of Fe 2+ by the protons of water leading to the formation of H 2) and hydrolyzed with water into serpentinite.
How does an olivine composition turn into a serpentine composition?
If an olivine composition contains sufficient fayalite, then olivine plus water can completely metamorphose to serpentine and magnetite in a closed system.
