Other
Scientific paper
Jul 1977
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977e%26psl..35..411g&link_type=abstract
Earth and Planetary Science Letters, vol. 35, no. 3, July 1977, p. 411-420.
Other
4
Binary Fluids, Iron Compounds, Planetary Cores, Planetary Evolution, Potassium, Silicates, Solubility, Dynamo Theory, Eutectics, Fractionation, Lunar Core, Potassium 40, Solid Solutions
Scientific paper
Potassium has been found to have extremely limited absolute solubility in Fe-S liquid in the pressure-temperature range of 18 to 40 kbars, 1050 to 1150 C, and fO2 within the field of metallic iron. It also partitioned into a certain silicate phase highly in preference to Fe-S liquid at 30 kbar and 1100 C. The dependence of the partitioning of K between solid silicate and Fe-S liquid on fO2 and compositions of mineral solid solutions have been analyzed. These experimental data, along with those of others, limit the amount of K that could fractionate in Fe-S liquid layers or a core in the early history of the moon and, thus, act as localized heat sources in its thermal history models; the data also seem to argue against a chondritic abundance of potassium for earth. The question of fractionation of enough K-40 in an Fe-S liquid outer core of earth to provide the necesary thermal energy for the geomagnetic dynamo remains unresolved.
Gangully J.
Kennedy George C.
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