Analytical Carbon Probe Measurements on Iron Meteorites

Details Analytical Carbon Probe Measurements on Iron Meteorites Analytical Carbon Probe Measurements on Iron Meteorites

Jul 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992metic..27s.260m&link_type=abstract

Meteoritics, vol. 27, no. 3, volume 27, page 260

Physics

Scientific paper

Using a tandem accelerator the process ^12C(d,p)^13C reaction has been used to measure the carbon contents of stony meteorites (Oberheuser et al. 1983; Van der Stap et al. 1986). Carbon has been measured in iron meteorites primarily by combustion and subsequent determination of the amount of CO2 produced (Moore et al. 1969; Lewis and Moore 1971). We use a tandem accelerator and the ^12C(d,p)^13C reaction to non-destructively measure the carbon contents of iron meteorites. The precise measurement of carbon in iron meteorites might prove to be important for determination of metallographical cooling rates. The effect of the analogous element P on the Fe-Ni phase diagram and diffusion coefficients is pronounced, but investigations of the similar effects for carbon have never been undertaken due to lack of proper analytical tools with the needed detection limit and spatial resolution. Very low abundance levels can be expected. Our estimated detection limit for carbon is ca. 10 micrograms/g, although we have not yet achieved this level (Haack 1991). The surface contamination on the samples is a severe problem in such low concentration ranges. In order to remove surface contamination we use an argon sputter source to clean off the surface layer. We have prepared standards for irons as well as for silicates. References: Haack, H. (1991) Unpublished Thesis. Lewis, C.F. and Moore, C.B. (1971) Meteoritics, 6, 195-205. Moore, C.B., Lewis, C.F., and Nava, D. (1969) In: Meteorite Research (ed. P. Millman), 738-748. Oberheuser, G., Katherin, H., Demortier, G., Gonska, H., and Freund, F. (1983) Geochim. Cosmochim. Acta, 47, 1117-1129. Van der Stap, C.C.A.H., Heymann, D., Vis, R.D., and Verheul, H. (1986) Proc. LPSC 16th, JGR, 91, D373-D377.

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