Cu, Zn, and In in Ordinary Chondrites

Details Cu, Zn, and In in Ordinary Chondrites Cu, Zn, and In in Ordinary Chondrites

Jul 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993metic..28..343e&link_type=abstract

Meteoritics, vol. 28, no. 3, volume 28, page 343

Other

1

Chalcophile Elements, Cu, Zn, In, Chondrites, Ordinary, Neutron Activation Analysis, Volatile Elements

Scientific paper

Cu, Zn, and In are moderately- to highly-volatile chalcophiles, as suggested by their condensation temperatures; 910K, 605K for Cu, Zn (at 10^-4 atm), respectively, and 456K for In (at 10^-5 atm) as 50% condensation temperature [1,2]. Hence, their relative abundances in meteorites are informative in considering the thermal history of meteorites. In this study, Cu, Zn, and In were determined by radiochemical neutron activation analysis for ordinary chondrites, mainly for Antarctic UOC's. Zn and Cu abundances in ordinary chondrites are not largely variable in UOC and EOC. In contrast, In abundances vary over an order of magnitude or more in UOC as well as in EOC. There is a systematic difference in In abundances between LL/L and H groups of UOC. Such a difference can be noticed in EOC, although a difference is rather small. Thus, the degree of variations in elemental abundances is not well correlated with the volatility of elements. There are at least three stages for controlling elemental abundances in meteoritic materials; nebular fractionation, shock metamorphism, and thermal metamorphism. Abundances of Cu and Zn in ordinary chondrites seem to have been mostly controlled by the nebular fractionation, possibly at the condensation stage. On the other hand, in EOC of L group, abundance of volatiles including In may have reflected the effect due to shock metamorphism, as suggested by [3,4]. It was confirmed in this work that there is a small but apparent difference in Zn abundances between EOC and UOC, in contrast to the conclusion obtained by [5]. Compared to Zn, In shows a larger difference in its abundances between UOC and EOC. In UOC of L and LL groups, In abundances are anomalously higher than those in EOC of the same groups, and are much higher than Zn abundances, reaching C1 and C2 levels. Even in H chondrites, similar tendencies can be noticed; UOC have higher abundances of In than EOC and In shows higher abundances than Zn in UOC. To explain these features in volatile abundances, we propose a model invoking the transportation of volatiles induced by thermal metamorphism on parent bodies. REFERENCES: [1] Grossman L. and Larimer J. W. (1974) Rev. Geophys. Space Phys., 12, 71-101. [2] Wai C. M. and Wasson J. T. (1977) EPSL, 36, 1-13. [3] Neal C. W. et al. (1981) GCA, 45, 891-898. [4] Walsh T. M. and Lipschutz M. E. (1982) GCA, 46, 2491-2500. [5] Kallemeyn G. W. (1989) GCA, 53, 2747-2767.

Affiliated with

Also associated with

No associations

Rating

Cu, Zn, and In in Ordinary Chondrites does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Cu, Zn, and In in Ordinary Chondrites, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Cu, Zn, and In in Ordinary Chondrites will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1072330