POTASSIUM SOLUBILITY IN METAL: THE EFFECTS OF COMPOSITION AT 15 KBAR AND 1900°C ON PARTITIONING BETWEEN IRON ALLOYS AND SILICATE MELTS
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dc.contributor.author | Chabot N.L. | |
dc.contributor.author | Drake M.J. | |
dc.date.accessioned | 2021-01-09T05:49:24Z | |
dc.date.available | 2021-01-09T05:49:24Z | |
dc.date.issued | 1999 | |
dc.identifier | https://elibrary.ru/item.asp?id=174451 | |
dc.identifier.citation | Earth and Planetary Science Letters, 1999, , 3, 323-335 | |
dc.identifier.issn | 0012-821X | |
dc.identifier.uri | https://repository.geologyscience.ru/handle/123456789/22476 | |
dc.description.abstract | To determine the role of radioactive heating as an energy source in planetary cores, the solubility of K in metal has been examined experimentally. All experiments were conducted at 15 kbar and 1900°C and involved K partitioning between Fe alloys and silicate melts. Experiments conducted with different concentrations of S in the metallic liquid indicate that S increases the solubility of K in metal. Unlike S, the presence of C in the metallic liquid does not increase K solubility in metal to a level detectable with the electron microprobe. The silicate composition significantly affects the solubility of K in S-rich metal, with the metal/silicate partition coefficient for K increasing by nearly two orders of magnitude with increasing depolymerization of the silicate melt. Using an appropriate silicate composition for the early, differentiating Earth and assuming that S is a significant light element in the core, the metal/silicate partition coefficient for K is 6x10-3 at 15 kbar and 1900°C. Such a partitioning value, if representative of the behavior of K at core formation conditions, suggests the presence of less than 1 ppm K in the Earth's core with a present-day heat generation of 1010 W, which is 2-3 orders of magnitude lower than estimates of the power necessary to drive the Earth's geodynamo. Other thermodynamic variables, namely pressure, temperature, and oxygen fugacity may also affect the solubility of K in metal. | |
dc.subject | CORE | |
dc.subject | DYNAMOS | |
dc.subject | HEAT SOURCES | |
dc.subject | PARTITION COEFFICIENTS | |
dc.subject | PLANETARY INTERIORS | |
dc.subject | POTASSIUM | |
dc.title | POTASSIUM SOLUBILITY IN METAL: THE EFFECTS OF COMPOSITION AT 15 KBAR AND 1900°C ON PARTITIONING BETWEEN IRON ALLOYS AND SILICATE MELTS | |
dc.type | Статья |
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