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Record 9 of 680
Osmium Solubility in Silicate Melts: New Efforts and New Results
Author and Affiliation:
Borisov, A.(NASA Johnson Space Center, Houston, TX United States)
Walker, R. J.(Maryland Univ., Dept. of Geology, College Park, MD United States)
Abstract: In a recent paper, Borisov and Palme reported the first experimental results on the partitioning of Os between metal (Ni-rich OsNi alloys) and silicate melt of anorthite-diopside eutectic composition at 1400 C and 1 atm total pressure and and at function of O2 from 10(exp -8) to 10(exp -12) atm. Experiments were done by equilibrating OsNi metal loops with silicate melt. Metal and glass were analyzed separately by INAA. D(sup 0s) ranged from 10(exp 6) to 10(exp 7), which is inconsistent with core/ mantle equilibrium for HSEs and favors the late veneer hypothesis. Unfortunately, there was practically no function of O2 dependence of Os partitioning, and the scatter of experimental results was quite serious, so the formation of Os nuggets was suspected. This new set of experiments was specifically designed to avoid of at least minimize the nugget problem
Publication Date: Jan 01, 1998
Document ID:
20000000493
(Acquired Dec 30, 1999)
Subject Category: LUNAR AND PLANETARY SCIENCE AND EXPLORATION
Document Type: Conference Paper
Publication Information: Origin of the Earth and Moon; 2-3; (LPI-Contrib-957); (SEE 20000000489)
Financial Sponsor: NASA Johnson Space Center; Houston, TX United States
National Academy of Sciences - National Research Council; Houston, TX United States
Organization Source: NASA Johnson Space Center; Houston, TX United States
Description: 2p; In English
Distribution Limits: Unclassified; Publicly available; Unlimited
Rights: No Copyright
NASA Terms: OSMIUM; OXYGEN; SILICATES; OSMIUM ISOTOPES; GEOCHEMISTRY; NEUTRON ACTIVATION ANALYSIS
Availability Source: Other Sources
Availability Notes: Abstract Only
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