Port Orford placers (Oregon)
Oregon, Klamath and Siskiyou Mountains, United States
OtherPGE (Os, Ir, Ru)
- Type
- Osmium alloy (PGE) placer derived from peridotites
Placers around Port Orford, near the mouth of the Rogue River (Klamath and Siskiyou Mountains). Meibom et al. (2004): mantle-derived Os-rich alloys, subchondritic Re/Os and Pt/Os.
187Os/188Os isotope ratio, no unit Values of the same system
Standard : Rapport absolu, sans standard de référence
| Value | Range | n | Mineral or matrix | Source |
|---|---|---|---|---|
| 0.11867 ± 0.00139 | 0.1166426 / 0.1202765 | 5 | Os-rich osmium alloy (detrital grain) Mean and standard deviation recalculated from 5 analyses, 0.1166426 to 0.1202765 (AM 21-109 0.1202765; AM 22-125 0.1166426; AM 22-114 0.119637; AM 9-104.1 0.1183486; AM 9-71.1 0.1184603). Grains from the collection: Musée Peabody de Yale (YPM MIN.1.182). Re/Os below 10^-3. AM 21-109 186Os/188Os 0.1198397, Pt/Os 0.31 (10 loads); AM 22-125 186Os/188Os 0.1198323, Pt/Os 0.01 (10 loads); AM 22-114 186Os/188Os 0.1198434, Pt/Os 0.09 (7 loads); AM 9-104.1 186Os/188Os 0.1198472 (3 loads); AM 9-71.1 186Os/188Os 0.1198421 (9 loads). | Meibom et al. (2004), Osmium isotopic compositions of Os-rich platinum group element allo… |
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- Kupferschiefer, Lubin-Sieroszowice district Poland
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Cite this page
IsoFind Atlas (2026). Port Orford placers (Oregon), isotope signatures. https://www.isofind.tech/isotopes/en/deposits/placers-de-port-orford-oregon/ (accessed 2026-10-21).
@misc{isofind2026portorfordplacersoregonisotop,
title = {Port Orford placers (Oregon), isotope signatures},
author = {{IsoFind Atlas}},
year = {2026},
url = {https://www.isofind.tech/isotopes/en/deposits/placers-de-port-orford-oregon/},
note = {Accessed 2026-10-21}
}Updated : 2026-10-21