Metallic Fe phases in Apollo 16 fines - Their origin and characteristics as revealed by electron spin resonance studiesThe intense electron spin resonance (ESR) signals detected in the Apollo 16 fines from three sites (61141,4, Station 1; 64501,22, South Ray Crater; 67601,20, North Ray Crater) are found to be essentially similar in g-value, in lineshape asymmetry and in temperature dependence to those previously observed for the Apollo 11-15 fines. On the basis of these similarities, it is concluded that these ESR signals like those detected in the Apollo 11-15 fines are principally ferromagnetic in nature arising from metallic Fe phases having the body-centered cubic structure, and not from hematite, magnetite, or any other ferric oxides. It is shown that a quantitative correlation exists between the ESR linewidth observed for the Apollo 11-16 fines and their average Ni contents in the metallic Fe phases as determined by other means. A common source of meteoritic origin is indicated for the metallic Fe phases of these samples.
Document ID
19740040245
Acquisition Source
Legacy CDMS
Document Type
Conference Proceedings
Authors
Tsay, F.-D.
Manatt, S. L. (California Institute of Technology, Jet Propulsion Laboratory, Space Sciences Div., Pasadena Calif., United States)
Live, D. H.
Chan, S. I. (California Institute of Technology Pasadena, Calif., United States)