Shock-induced fine-grained recrystallization of olivine - Evidence against subsolidus reduction of Fe/2+/

Details Shock-induced fine-grained recrystallization of olivine - Evidence against subsolidus reduction of Fe/2+/ Shock-induced fine-grained recrystallization of olivine - Evidence against subsolidus reduction of Fe/2+/

Apr 1976

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976lpsc....7.1143a&link_type=abstract

In: Lunar Science Conference, 7th, Houston, Tex., March 15-19, 1976, Proceedings. Volume 1. (A77-34651 15-91) New York, Pergamon

Physics

2

Granular Materials, Olivine, Recrystallization, Shock Loads, Electron Spin, Fines, Iron, Lunar Soil, Metal Particles, Petrography, Pressure Effects, Spin Resonance

Scientific paper

Electron spin resonance (ESR) studies have been carried out on three single grains of terrestrial olivine (Fo90) shock loaded along the 010 line to peak pressures of 280, 330, and 440 kbar. The results indicate that neither metallic Fe similar to that observed in returned lunar soils nor paramagnetic Fe(3+) caused by oxidation of Fe(2+) has been produced in these shock experiments. Trace amounts of Mn (2+) have been detected in both shocked and unshocked olivine. The ESR signals of Mn(2+) show spectral features which are found to correlate with the degree of shock-induced recrystallization observed petrographically. The increasing mass fraction of recrystallized olivine correlates with increasing shock pressures. This phenomenon is modelled assuming it results from the progressive effect of the shock-induced transformation of the olivine to a yet unknown high-pressure phase and its subsequent reversion to the low-pressure olivine phase. The mass fraction of recrystallized material is predicted to be nearly linear with shock pressure.

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