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Trace elements in chondritic stratospheric particles - Zinc depletion as a possible indicator of atmospheric entry heatingMajor-element abundances in 11 C, C?, and TCA cosmic dust particles have been measured using SEM and TEM energy dispersive X-ray (EDX) systems. The Fe/Ni ratio, when coupled with major element abundances, appears to be a useful discriminator of cosmic particles. Three particles classified as C?, but having Fe/Ni peak height ratios similar to those measured on the powdered Allende meteorite sample in their HSC EDX spectra, exhibit chondritic minor-/trace-element abundance patterns, suggesting they are extraterrestrial. The one particle classified as C-type, but without detectable Ni in its JSC EDX spectrum, exhibits an apparently nonchondritic minor-/trace-element abundance pattern. A class of particles that are chondritic except for large depletions in the volatile elements Zn and S has been identified. It is likely that these particles condensed with a C1 abundance pattern and that Zn and S were removed by some subsequent process.
Document ID
19920048243
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Flynn, G. J.
(New York, State University Plattsburgh, United States)
Sutton, S. R.
(Chicago, University IL; Brookhaven National Laboratory, Upton, NY, United States)
Date Acquired
August 15, 2013
Publication Date
January 1, 1992
Subject Category
Lunar And Planetary Exploration
Meeting Information
Meeting: Lunar and Planetary Science Conference
Location: Houston, TX
Country: United States
Start Date: March 18, 1991
End Date: March 22, 1991
Sponsors: American Association of Petroleum Geologists, NASA, Lunar and Planetary Institute
Accession Number
92A30867
Funding Number(s)
CONTRACT_GRANT: NSF EAR-86-18346
CONTRACT_GRANT: NAG9-469
CONTRACT_GRANT: DE-AC02-76CH-00016
CONTRACT_GRANT: NAG9-106
Distribution Limits
Public
Copyright
Other

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