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Shock-induced deformation features in terrestrial peridot and lunar dunite

Snee, Lawrence W. and Ahrens, Thomas J. (1975) Shock-induced deformation features in terrestrial peridot and lunar dunite. In: Proceedings of the Sixth Lunar Science Conference. Geochimica et cosmochimica acta. Supplement 6. No.1. Pergamon Press , New York, NY, pp. 833-842. ISBN 9780080205663.

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Single crystals of terrestrial olivine (Fo90) were experimentally shock-loaded along [010] to peak pressures 280, 330, and 440 kbar and the resulting deformation features were compared to those present in olivine from lunar dunite 72415. Recovered fragments were examined on the Universal stage to determine the orientation of the planar fractures. With increasing pressure the percentage of pinacoids ({100}, {010}, and {001}) and prisms ({hkO}, {hOl}, and {Okl}), decreases (~40 to ~25%), whereas the percentage of bi pyramids {hkl} increases (~20-50% ). The complexity of the distribution of bipyramids also increases with increasing pressure. Other shock-induced deformation features, including varying degrees of recrystallization, are found to depend on pressure as observed by others. Lunar dunite 72415 was examined and found to contain olivine with well-developed shock deformation features. The relative proportion of pinacoid, prism, and bipyramid planar fractures measured for olivine from 72415 indicates that this rock appears to have undergone shock pressure in the range 330-440 kbar. It displays a preponderance of bipyramid fractures along (2 h = k) planes which have not previously been reported in laboratory or naturally shocked samples. If this dunite was brought to the surface of the moon as a result of excavation of an Imbrium event-sized impact crater, the shock-pressure range experienced by the sample and the results of cratering calculations suggest that it could have originated no deeper than 50-150 km.

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Additional Information:© 1975 Lunar and Planetary Institute. Provided by the NASA Astrophysics Data System. Contribution No. 2574, Division of Geological and Planetary Sciences, California Institute of Technology, Pasadena, California 91125. We wish to thank Arden L. Albee and Robert Dymek for assistance with lunar dunite 72415 and Robert Dymek, Frederich Horz, and Charles Sclar for very careful reviews of this paper. Technical assistance by David Johnson and Judith Snee was greatly appreciated also. Research was supported under NGL-05-004-074 (University of California, Davis) and NGL-05-002-105.
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Caltech Division of Geological and Planetary Sciences2574
Series Name:Geochimica et cosmochimica acta. Supplement 6
Issue or Number:1
Record Number:CaltechAUTHORS:20150709-075513625
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Official Citation:Shock-induced deformation features in terrestrial peridot and lunar dunite Snee, L. W.; Ahrens, T. J. Lunar Science Conference, 6th, Houston, Tex., March 17-21, 1975, Proceedings. Volume 1. (A78-46603 21-91) New York, Pergamon Press, Inc., 1975, p. 833-842
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:58818
Deposited By: Ruth Sustaita
Deposited On:22 Jul 2015 19:03
Last Modified:03 Oct 2019 08:40

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