Mathematics – Logic
Scientific paper
Jul 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994metic..29q.466f&link_type=abstract
Meteoritics (ISSN 0026-1114), vol. 29, no. 4, p. 466
Mathematics
Logic
1
Abundance, Chondrites, Interplanetary Dust, Meteoritic Composition, Mineralogy, Trace Elements, Bromine, Chemical Composition, Selenium, Synchrotron Radiation, X Ray Fluorescence, Zinc
Scientific paper
Mineralogical similarities between the matrix of the unequilibrated ordinary chondrite Semarkona and smectite-type, hydrated interplanetary dust particles (IDPs) caused Alexander et al. and Thomas et al. to suggest hydrated IDPs may be produced by fragmentation of the Semarkona parent body. If so, hydrated IDPs and Semarkona matrix should be similar in chemical composition. Trace element abundances in eight samples of Semarkona matrix, each approximately 100 x 100 x 50 micron (approximately 1 microgram), were measured by Synchrotron X-Ray Fluorescence microprobe. The Semarkona matrix shows significant heterogenity on the 1-microgram scale with Ni, Zn, Ge, Se, Br, and Rb varying by more than a factor of 4, and Cu, Ga, and Sr varying by an order of magnitude among the samples. The most striking deviation of the average Semarkona matrix composition from CI is the Rb enrichment. This may be a signature of the smectite alteration of mafic silicates. The average abundances of Zn, Se, and Br in these eight fragments are in good agreement with the averages for these elements reported by Grossman on a different set of samples. The average element abundance pattern of Semarkona matrix is distinctly different from CI. Zn/Se is lower by a factor of 2 in Semarkona matrix than in CI. Grossman's Zn and Se abundances on a much larger mass of Semarkona matrix, substantiate this difference. Several Semarkona fragments are close to CI in volatile content.
Bajt Saa
Flynn George James
Klöck W.
Sutton Richard S.
Thomas Kathie L.
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