Physics
Scientific paper
Nov 1975
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975e%26psl..28...65k&link_type=abstract
Earth and Planetary Science Letters, vol. 28, no. 1, Nov. 1975, p. 65-68.
Physics
Breccia, Lunar Rocks, Metamorphism (Geology), Olivine, Apollo 14 Flight, Chemical Reactions, Coronas, Oxygen, Reduction (Chemistry)
Scientific paper
Reaction coronas of pyroxene plus or minus ilmenite occur around clasts of olivine in Apollo 14 high-grade metamorphic breccias. In experiments of several months duration, there was no evidence of corona formation at 1000 C, but at 1050, with oxygen fugacity at or above Ilm-Ru-Fe and below Fe-Fe(1-x)O, incipient coronas formed around Fo(50-70), Fo(68), En(69) + Fe. Reduction of olivine under these conditions is inconsistent with the calculated stability relations and is attributed to uncertainties in the activity coefficient for olivine or pyroxene. The experiments also suggest that vesicularity in the Apollo 14 high-grade breccias may correlate with the amount of glassy material in their unmetamorphosed precursors. The metamorphic event is attributed to burial in a hot ejecta blanket, such as that of the Imbrium event.
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