NDLI: Os solubility in silicate melts: New efforts and results

Content Provider	Semantic Scholar
Author	Borisov, Alexander Walker, Richard J.
Copyright Year	2000
Abstract	Abstract New experimental results are reported on the partitioning of Os between Ni94Os6 (at) alloys and silicate melt at 1400 °C at one atmosphere total pressure and oxygen fugacities ranging from 10-6 to 10-8 atm. Specially designed experiments allowed us to avoid nugget formation, which was responsible for the anomalously high Os solubilities reported by Borisov and Palme (1998). Experimental glasses were analyzed by instrumental neutron activation analysis and by isotope dilution analysis. Results reveal a strong dependence of Os solubility on fO₂, with Os contents decreasing from about 100 ppb to about 5 ppb as fO₂ decreases. The slope of log (Os solubility) vs. log fO₂ implies that Os3+ is the dominant Os valence state in silicate melts. The relative geochemical behavior of Os and Pt is also compared. Results suggest that Pt is more siderophile, and may also be more chalcophile than Os under the conditions considered.
Starting Page	912
Ending Page	917
Page Count	6
File Format	PDF HTM / HTML
DOI	10.2138/am-2000-0704
Volume Number	85
Alternate Webpage(s)	http://www.minsocam.org/msa/AmMin/TOC/Abstracts/2000_Abstracts/JA00_Abstracts/Borisov_p912_00.pdf
Alternate Webpage(s)	https://doi.org/10.2138/am-2000-0704
Language	English
Access Restriction	Open
Content Type	Text
Resource Type	Article

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