Potassium solubility in metal: the effects of composition at 15 kbar and 1900°C on partitioning between iron alloys and silicate melts

摘要: Abstract To determine the role of radioactive heating as an energy source in planetary cores, solubility K metal has been examined experimentally. All experiments were conducted at 15 kbar and 1900°C involved partitioning between Fe alloys silicate melts. Experiments with different concentrations S metallic liquid indicate that increases metal. Unlike S, presence C does not increase to a level detectable electron microprobe. The composition significantly affects S-rich metal, metal/silicate partition coefficient for increasing by nearly two orders magnitude depolymerization melt. Using appropriate early, differentiating Earth assuming is significant light element core, 6×10−3 1900°C. Such value, if representative behavior core formation conditions, suggests less than 1 ppm Earth's present-day heat generation 1010 W, which 2–3 lower estimates power necessary drive geodynamo. Other thermodynamic variables, namely pressure, temperature, oxygen fugacity may also affect