NASA Logo

NTRS

NTRS - NASA Technical Reports Server

Back to Results
Phosphate-sulfide assemblages and Al/Ca ratios in type-3 chondritesElectron microscopic examinations were carried out on various chondrites to re-examine previously reported anomalously high Al/Ca ratios. Polished thin sections of the three CV3, two CO3 and the Krymka LL3 chondrites were scanned to characterize the phosphate-sulfide inclusions. The formation of the assemblages was interpreted as proceeding in five steps, starting with the formation of metal grains with early nebular material and finishing with a reaction between schreibersite with Ca, O and Cl to form merrillite and chloropatite. The abundances of the observed assemblages were not high enough to imply Al/Ca ratios similar to whole-rocks. It is concluded that the specimens were originally examined with a broader electron beam than used to examine standard samples, and resulted in the anomalously high Al/Ca ratios.
Document ID
19860029052
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Rubin, A. E.
(California Univ. Los Angeles, CA, United States)
Grossman, J. N.
(California, University Los Angeles, United States)
Date Acquired
August 12, 2013
Publication Date
September 30, 1985
Publication Information
Publication: Meteoritics
Volume: 20
ISSN: 0026-1114
Subject Category
Lunar And Planetary Exploration
Accession Number
86A13790
Funding Number(s)
CONTRACT_GRANT: NAG9-40
Distribution Limits
Public
Copyright
Other

Available Downloads

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