TY - JOUR
T1 - Solubility of K in Fe-S liquid, silicate-K-(Fe-S)liq equilibria, and their planetary implications
AU - Ganguly, Jibamitra
AU - Kennedy, George C.
N1 - Funding Information:
absorption, anXd-ray fluorescencaen alysisT. his researchw as supportedb y a grant from NASA NGL05-007-006.
PY - 1977/7
Y1 - 1977/7
N2 - Potassium has been found to have extremely limited absolute solubility in Fe-S liquid in the P-T range of 18-40 kbars, 1050-1150°C, and f{hook}O2 within the field of metallic iron. It also partitioned to certain silicate phase highly in preference to Fe-S liquid at 30 kbars, 1100°C. The dependence of the partitioning of K between solid silicate and Fe-S liquid on f{hook}O2 and compositions of mineral solid solutions has 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, and also seem to argue against a chondritic abundance of potassium for the earth. The question of fractionation of enough 40K in an Fe-S liquid outer core of the earth to provide the necessary thermal energy for the geomagnetic dynamo remains unresolved.
AB - Potassium has been found to have extremely limited absolute solubility in Fe-S liquid in the P-T range of 18-40 kbars, 1050-1150°C, and f{hook}O2 within the field of metallic iron. It also partitioned to certain silicate phase highly in preference to Fe-S liquid at 30 kbars, 1100°C. The dependence of the partitioning of K between solid silicate and Fe-S liquid on f{hook}O2 and compositions of mineral solid solutions has 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, and also seem to argue against a chondritic abundance of potassium for the earth. The question of fractionation of enough 40K in an Fe-S liquid outer core of the earth to provide the necessary thermal energy for the geomagnetic dynamo remains unresolved.
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U2 - 10.1016/0012-821X(77)90074-7
DO - 10.1016/0012-821X(77)90074-7
M3 - Article
AN - SCOPUS:0343863340
SN - 0012-821X
VL - 35
SP - 411
EP - 420
JO - Earth and Planetary Science Letters
JF - Earth and Planetary Science Letters
IS - 3
ER -