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The distribution of platinum and palladium metals in iron meteorites and in the metal phase of ordinary chondrites

Nichiporuk, Walter and Brown, Harrison (1965) The distribution of platinum and palladium metals in iron meteorites and in the metal phase of ordinary chondrites. Journal of Geophysical Research, 70 (2). pp. 459-470. ISSN 0148-0227. doi:10.1029/JZ070i002p00459.

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The concentrations of Ru, Rh, Pd, Ir, and Pt have been determined spectrographically in twenty-four iron meteorites and in the metal phase of five ordinary chondrites. It was found that most iron meteorites fall into three distinct groups with regard to the Ru and Rh concentrations and into three groups with regard to the Ir and Pt concentrations, each Ir-Pt group corresponding to one of the Ru-Rh groups. Correlations are observed between these Ir-Pt and Ru-Rh groups on the one hand, and the Ga-Ge groups found by previous workers on the other, but the relationships are by no means clear-cut. Compared with Ru, Ir, and Pt, Pd was found to vary over a relatively small range. The metal phases of all chondrites studied are chemically identical with the iron meteorites of the largest Ru-Rh and the largest Ir-Pt group, namely the Ru-Rh group which contains about 6 ppm Ru and 1.5 ppm Rh, and the Ir-Pt group which contains about 2 ppm Ir and 7 ppm Pt. The following atomic abundances (Si = 10^6) of Ru, Rh, Pd, Ir, and Pt have been derived from our data: Ru Rh Pd Ir Pt Based on metal phase of high-iron-group chondrites 1.66 0.27 1.05 0.40 1.22 Based on iron meteorites, assuming they constitute 10%of mean meteoritic matter 1.44 0.23 0.52 0.31 0.89 These values generally agree within a factor of less than 2 with the abundances calculated by recent workers.

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Additional Information:Copyright 1965 by the American Geophysical Union. (Manuscript received July 20, 1964.) We thank Elizabeth Bingham and Arthur Chodos for helping us with the spectrographic determinations. We are indebted to the following persons who made available samples of a number meteorites used in this investigation: E. P. Henderson of the United States National Museum, C. F. Frondel of Harvard University, A. A. Yavnel' of the Committee on Meteorites of the Soviet Academy of Sciences, and J. F. Lovering of the Australian National University. The sample of Mount Tabby was obtained through the generosity of the Geology Museum of the University of Utah. This work was supported by the National Aeronautics and Space Administration, grant NsG 56-60, and the Atomic Energy Commission, contract AT (11-1)-208. Contribution 1275, Division of Geological Sciences, Seeley W. Mudd Laboratory, California Institute of Technology, Pasadena.
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NASANsG 56-60
Atomic Energy CommissionAT (11-1)-208
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Caltech Division of Geological Sciences1275
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Official Citation:Nichiporuk, W., and H. Brown (1965), The distribution of platinum and palladium metals in iron meteorites and in the metal phase of ordinary chondrites, J. Geophys. Res., 70(2), 459–470, doi:10.1029/JZ070i002p00459.
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:51511
Deposited By: George Porter
Deposited On:10 Nov 2014 21:05
Last Modified:10 Nov 2021 19:12

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