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Pyroxenes in the Shaw (L-7) chondrite

, : Pyroxenes in the Shaw (L-7) chondrite. Geochimica et Cosmochimica Acta: 2, Pages 1585-1594. 1975.

The Shaw L-group chondrite differs from orthodox type 6 ordinary chondrites in ways which suggest that it experienced unusually high metamorphic temperatures and anatexis. Electron microprobe and single crystal X-ray diffraction data indicate that Shaw contains three pyroxenes: the augite (Fs11.3Wo38.2) and calcic orthopyroxene (Fs19.4WO4·5) reported by other workers and a second, Ca- and Al-poor orthopyroxene (Fs16·8Wo1·2) which we interpret as inverted protobronzite. Comparison of the Shaw assemblage with experimental data suggests that a two-phase (augite-protobronzite) assemblage developed at peak metamorphic temperatures of ~1250–1300°C, that partial reaction of augite and protobronzite produced calcic orthopyroxene and by-product spinel at temperatures approximately 150°C lower and that protobronzite inverted to bronzite free of stacking disorder during subsequent slow cooling. The intracrystalline distribution of Fe and Mg in the Ca-poor bronzite (KE + 0·07; determined by crystal structure analysis) indicates an equilibration temperature of ~500°C.


DOI: 10.1016/0016-7037(75)90081-2

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