Other
Scientific paper
Apr 1970
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1970gecoa..34..493e&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 34, Issue 4, pp.493-507
Other
12
Scientific paper
Gold and iridium abundances in stony meteorites and various meteoritic and terrestrial materials have been determined by the technique of neutron activation. Gold abundances in chondrites reported here and by and (1965) are in generally good agreement with published data of other workers. Compilation of all available gold data yields the following group averages (in units of 10 -9 g/g) : C1-140, C2-177,C3-184, Enstatite-322, H-group-228, L-group-162, LL-group-167. Iridium data were obtained by use of an improved radiochemical separation technique and also a non-destructive technique employing gamma-gamma coincidence spectrometry. Evidence is presented that some earlier iridium determinations via radiochemical separations may be subject to significant analytical error. Iridium concentrations for the various chondrite groups as determined by the non-destructive coincidence technique of this work are (in units of 10 -9 g/g): Cl-490, C2-608, C3-645, Enstatite-618, H-group-781, L-group-453, LL-group-371. The significance of the meteorite data to the life history of these objects is discussed, with particular reference to the metal-silicate fractionation process during the formation of the chondrites.
Baedecker Philip A.
Ehmann William D.
McKown D. M.
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