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Shock-induced fine-grained recrystallization of olivine: Evidence against subsolidus reduction of Fe^(2+)

Ahrens, Thomas J. and Tsay, Fun-Dow and Live, David H. (1976) Shock-induced fine-grained recrystallization of olivine: Evidence against subsolidus reduction of Fe^(2+). In: 7th Lunar Science Conference. Geochimica et cosmochimica acta. Supplement. Vol.1. No.7. Pergamon Press , New york, NY, pp. 1143-1156. ISBN 0080217710.

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Electron spin resonance (ESR) studies have been carried out on three single grains of terrestrial olivine (F0_(90)) shock loaded along [010] 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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Additional Information:© 1976 Lunar and Planetary Institute. This work was partially supported under Contract no. NAS-7-100 to the Jet Propulsion Laboratory and NGL-05-002-105 to the Seismological Laboratory. We appreciate the enthusiastic computational assistance of Mr. Bart Martin of LaSalle High School, Pasadena, California.
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Series Name:Geochimica et cosmochimica acta. Supplement
Issue or Number:7
Record Number:CaltechAUTHORS:20150902-080955905
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Official Citation:Shock-induced fine-grained recrystallization of olivine - Evidence against subsolidus reduction of Fe/2+/ Ahrens, T. J., Tsay, F.-D., & Live, D. H. In: Lunar Science Conference, 7th, Houston, Tex., March 15-19, 1976, Proceedings. Volume 1. (A77-34651 15-91) New York, Pergamon Press, Inc., 1976, p. 1143-1156.
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:60023
Deposited By: Ruth Sustaita
Deposited On:11 Sep 2015 18:38
Last Modified:03 Oct 2019 08:52

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