Pyroxenes in Serra de Mage - Cooling history in comparison with Moama and Moore County

Details Pyroxenes in Serra de Mage - Cooling history in comparison with Moama and Moore County Pyroxenes in Serra de Mage - Cooling history in comparison with Moama and Moore County

May 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979e%26psl..43..173h&link_type=abstract

Earth and Planetary Science Letters, vol. 43, no. 2, May 1979, p. 173-181.

Computer Science

13

Cooling, Meteoritic Composition, Pyroxenes, Crystallography, Electron Diffraction, Feldspars, Lunar Exploration, Lunar Rocks, Serra De Mage Meteorite, Moore County Eucrite, Augite, Moama Meteorite, Pyroxenes, Composition, Feldspar, Pigeonite, Exsolution, Textures, Achondrites, Grains, Cumulates, Eucrites, Cooling Rate, Thermal History, Temperatures, Orthopyroxenes, Experiments

Scientific paper

Thin sections and single grains of pyroxenes from the Serra de Mage feldspar cumulate eucrites were studied by X-ray crystallography, electron microprobe and optical techniques. It was concluded that the pyroxene crystallized as pigeonite. On cooling augite was exsolved along (001) and inverted to hypersthene, with exsolution of (100) augite from hypersthene during continued slow cooling. The estimated original bulk composition of the pigeonite pyroxene is Wo10En51Fs39. The compositional data, textural relations, and existence of P21 ca hypersthene suggest very low cooling (about 0.0004 deg C/year) below 800 deg. The Serra de Mage augite lamellae were found to be as thick or thicker than those of Moore County and Moama meteorites.

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