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Water Solubility of Bridgmanite, General Context, MEMBERS: JOSE ASIS …
Water Solubility of Bridgmanite
Study Context
•Dominant mineral in the lower mantle
• Fórmula: (Mg,Fe)SiO3
• Discovered in meteorite in Australia
Bridgmanite
Dominant mineral in the lower mantle
Chemical formula: (Mg,Fe)SiO3
Discovered in meteorite in Australia
Named after physicist Percy Bridgman
Phases coexist:
•
Garnet
545-1570 ppm by weight of H2O
•
stishovite
295 ppm by weight of H2O
•
ferropericlase
water solubility: <50 ppm H2O
low water solubility (<50 ppm)
pyrolytic lower mantle
partial melting by transport of water-rich minerals
Discovery of Bridgmanite in Meteorite
Discovery
T
enham L6 Meteorite: Location of discovery.
Training Conditions
: Pressure: ~24 GPa. Temperature: ~2300K.
Mineral Association:
Bridgmanite found along with akimotoite. Both present in shock fusion veins in the meteorite.
Discovery Difficulty:
Bridgmanite is stable only at high pressures and temperatures.
Metastable under ambient conditions and vitrifies at relatively low temperatures.
Importance:
It represents around 38% of the Earth's volume, essential in the distribution of elements and flow of mass and heat in the Earth's mantle.
Composition
: MgSiO₃ in orthorhombic perovskite structure.
Mineralogy:
Bridgmanite is the most abundant mineral on Earth.
Research Techniques in the Discovery of Bridgmanite
Scanning Electron Microscopy (SEM)
Observation of submicron crystal aggregates.
Provides detailed images of the mineral structure and morphology.
Synchrotron X-ray Diffraction
Identification of the crystal structure without destroying the sample.
Confirmation of the orthorhombic perovskite structure of bridgmanite.
Chemical analysis
Verified chemical composition.
Comparison with synthetic bridgmanites, confirming the similarity.
General Context
MEMBERS: JOSE ASIS
ALVARO ALVAREZ