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- W156800348 abstract "We have developed an ion-probe technique that permits in situ determination of the abundances of Os, Ir, Pt, and Au in iron meteorites. This technique allows us to examine the microdistributions and partitioning of heavy PGEs and Au within and among the metallic phases of iron meteorites. This information is important for the further development of the ReOs chronometer, for understanding the behavior of PGEs during solid-state segregation of Fe,Ni phases, and perhaps for refining estimates of cooling histories of iron meteorites. We have applied this technique to kamacite and taenite in the Cape York (IIIA), Canyon Diablo (IAB), and Colomera (IIE) iron meteorites. Experimental: Data were collected using a Cs+ primary beam (spatial resolution ~20 μm) to sputter negative secondary ions of Fe, Co, Ni, Os, Ir, Pt, and Au from sample surfaces. An energy offset of 40 eV was used to suppress complex molecular ions, and a mass resolution of ~1600 resolved the remaining signals from various Cs-Fe or Cs-Ni molecules. Isotopic ratios (188Os/189Os, 191Ir/193Ir, and 194Pt/195Pt) were monitored to assure that only PGE ions were being counted. Sensitivity factors were determined from the Santa Clara ataxite, which has high PGE abundances and for which abundances of Os, Ir, and Au are available[1-3]. The abundance of Pt was inferred by assuming a cosmic Pt/Ir ratio in Santa Clara, an assumption supported by the measured cosmic Os/Ir ratio in Santa Clara. Ion yields for Fe, Ni, and Co co-vary by up to a factor of 5 over the course of a measurement, while those for Os, Ir, Pt, and Au remain approximately constant. Since the Fe, Ni, and Co count-rate patterns are not reproducible from spot to spot, we normalized our PGE count rates to the beam current and ran all samples and standards using a 10 nA ion beam. Drifts in ion-beam current limit our reproducibility to 20% from spot to spot, but differences larger than this are considered to be real. The absolute calibration of the abundances is more uncertain due to real variation in PGE abundance in Santa Clara. A suite of 31 independent measurements of Santa Clara gave a range of 50%, so our absolute abundance determinations are uncertain by about a factor of two. We had hoped to measure Re and the light PGEs with the same procedure, but ion yields were too low for meaningful results." @default.
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- W156800348 date "1998-03-01" @default.
- W156800348 modified "2023-09-27" @default.
- W156800348 title "In Situ Ion Probe Measurements of PGEs and Their Distributions Between Metallic Phases of Irons" @default.
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