Natural (Mg,Fe)SiO3-ilmenite and -perovskite in the Tenham meteorite.

Details Natural (Mg,Fe)SiO3-ilmenite and -perovskite in the Tenham meteorite. Natural (Mg,Fe)SiO3-ilmenite and -perovskite in the Tenham meteorite.

Aug 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997sci...277.1084t&link_type=abstract

Science, Vol. 277, No. 5329, p. 1084 - 1086

Computer Science

33

Chondrites: Minerals

Scientific paper

The minerals (Mg,Fe)SiO3-ilmenite and -perovskite were identified in the shock-induced veins in the Tenham chondritic meteorite. Both phases are inferred to have transformed from pyroxene at high pressures and temperatures by shock metamorphism. Columnar-shaped ilmenite grains, one of two types of morphologies, have a topotaxial relationship with neighboring pyroxene grains, indicating shear transformation. Granular-shaped perovskite grains showed a diffraction pattern consistent with orthorhombic perovskite, but these grains were not stable under the electron beam irradiation and became amorphous. The higher iron concentration in both phases compared with those experimentally reported may suggest their metastable transition from enstatite because of shock compression.

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