NASA Logo

NTRS

NTRS - NASA Technical Reports Server

Back to Results
Shock-induced fine-grained recrystallization of olivine - Evidence against subsolidus reduction of Fe/2+/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.
Document ID
19770051870
Acquisition Source
Legacy CDMS
Document Type
Conference Proceedings
Authors
Ahrens, T. J.
(California Institute of Technology Pasadena, Calif., United States)
Tsay, F.-D.
(California Inst. of Tech. Pasadena, CA, United States)
Live, D. H.
(California Institute of Technology, Jet Propulsion Laboratory, Space Sciences Div., Pasadena Calif., United States)
Date Acquired
August 9, 2013
Publication Date
January 1, 1976
Subject Category
Lunar And Planetary Exploration
Meeting Information
Meeting: Lunar Science Conference
Location: Houston, TX
Start Date: March 15, 1976
End Date: March 19, 1976
Accession Number
77A34722
Funding Number(s)
CONTRACT_GRANT: NGL-05-002-105
CONTRACT_GRANT: NAS7-100
Distribution Limits
Public
Copyright
Other

Available Downloads

There are no available downloads for this record.
No Preview Available