Инд. авторы:	Watanabe K., Ohtani E., Kamada S., Sakamaki T., Miyahara M., Ito Y.
Заглавие:	The abundance of potassium in the Earth's core
Библ. ссылка:	Watanabe K., Ohtani E., Kamada S., Sakamaki T., Miyahara M., Ito Y. The abundance of potassium in the Earth's core // Physics of the Earth and Planetary Interiors. - 2014. - Vol.237. - P.65-72. - ISSN 0031-9201. - EISSN 1872-7395.
Внешние системы:	DOI: 10.1016/j.pepi.2014.10.001; SCOPUS: 2-s2.0-84909581430; WoS: 000345722800006;
Реферат:	eng: We studied partitioning of potassium (K) between aluminosilicate (adularia, KAlSi3O8) and metals with and without light elements, oxygen and silicon (Fe-O, Fe-Si, and pure Fe metals). We conducted experiments at pressures up to 50GPa, temperatures up to 3500K, and oxygen fugacities (log fO2) between 2.5 and 4.0 log units below the iron-wüstite (IW) buffer using a double-sided laser-heated diamond anvil cell. Our results on pressure, temperature, and compositional effects on partition coefficient of potassium, DK (i.e., the content of potassium in metal [wt%] divided by the content of potassium in silicate [wt%]), revealed that the temperature effect is slightly positive but weaker than that reported previously, whereas the pressure effect is negative. Oxygen in metal increases the potassium content in metal, whereas silicon in metal has the opposite effect. According to the present study on potassium partitioning, we estimated that the amount of potassium in the core is less than 40ppm and that it generates less than 0.17TW heat in the core. The amount of heat generated in the core is very small compared with the heat escaping from the core at the core-mantle boundary (5-15TW). © 2014 Elsevier B.V.
Ключевые слова:	High pressure; High temperature; Magma ocean; Partition coefficient; silicon; potassium; partitioning; P-T conditions; oxygen; fugacity; experimental study; Earth structure; diamond anvil cell; core-mantle boundary; core (planetary); aluminosilicate; Potassium; Partition coefficient; Magma ocean; High temperature; High pressure; Earth's core; Silicon; Silicates; Oxygen; Metals; High pressure engineering; Chemical elements; Potassium; Earth's core;
Издано:	2014
Физ. характеристика:	с.65-72