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Fe-57 Moessbauer study of tektitesMoessbauer measurements were made on selected moldavite, australite, philippinite, and Georgia tektites. The spectra consist of two apparent lines, but at least two quadrupole doublets can be fitted to these spectra. The Moessbauer parameters for these doublets indicate that they arise from Fe2+ ions with local environments, which are relatively rich and relatively poor in calcium, respectively, similar to those in clinopyroxenes. No evidence for Fe3+/Fe2+ ratios above 0.01 (estimated detection limit) have been found in any tektite. Tektites are considerably more reduced than previously believed, and the extent of the reduction shows little or no variation among different types of tektites. These results limit the source materials of tektites to minerals in which the iron is uniformly highly reduced and in which the iron is contained clinopyroxene-like phases.
Document ID
19760024033
Acquisition Source
Legacy CDMS
Document Type
Contractor Report (CR)
Authors
Evans, B. J.
(Michigan Univ. Ann Arbor, MI, United States)
Leung, L. K.
(Michigan Univ. Ann Arbor, MI, United States)
Date Acquired
September 3, 2013
Publication Date
September 1, 1976
Subject Category
Lunar And Planetary Exploration
Report/Patent Number
NASA-CR-148774
Accession Number
76N31121
Funding Number(s)
CONTRACT_GRANT: NGR-23-005-537
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.
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