Reference Database (ERR)
Development and Maintenance by the Database Team

Detailed Reference Information
Jochum 1996
Jochum, K.P. (1996). Rhodium and other platinum-group elements in carbonaceous chondrites. Geochimica et Cosmochimica Acta 60(17): 3,353-3,357.
Five carbonaceous chondrites (including the CI chondrites Orgueil and Ivuna) were analyzed by spark source mass spectrometry (SSMS) for the platinum-group elements Ru, Rh, Os, Ir, Pt, as well as W, Re, Au, Th, and U. Conventional photoplate detection and a recently developed multi-ion counting system were used for ion detection. Results obtained for CI chondrites agree with compiled values within 6%. This study contains the first Rh analyses for this chondrite group. Rhodium concentrations for Orgueil and Ivuna agree well, implying a Solar System abundance of 0.140 +/- 0.001 ppm and corresponding to 0.359 +/- 0.010 atoms relative to 1 x 10(6) Si atoms. Concentrations in CM2, CV3, and CK4 chondrites are enriched compared to those of CI chondrites. However, the abundances of the refractory siderophile elements Re, Os, Ir with condensation temperatures above 1600 K (at 10(-4) atm) are higher by about 15-20% compared to the less refractory elements Ru, Pt, and Ph. Elements with similar condensation temperatures correlate very well resulting in uniform concentration ratios of Rh/Pt = 0.136 +/- 0.006, Re/Os = 0.0821 +/- 0.0019, and Ir/Os = 0.949 +/- 0.939.

Analytical Techniques - Conventional Photoplate Detection
Analytical Techniques - Multi-Ion Counting Counting

solar-system abundances, allende inclusion, trace-element, assemblages, ssms
Geochimica et Cosmochimica Acta
Elsevier Science
P.O. Box 211
1000 AE Amsterdam
The Netherlands
(+31) 20 485 3757
(+31) 20 485 3432
Click to clear formClick to return to previous pageClick to submit