Melting of the FeFeO and the FeFeS systems at high pressure: Constraints on core temperatures

摘要: Melting temperatures of FeO, FeS and FeS2 have been accurately determined in a hydrostatic, inert pressure environment up to about 0.5 Mbar using new yttrium-lithium-fluoride (YLF) heating laser. The melting curve for FeO is perfect agreement with data obtained from multi-anvil experiments at 160 kbar [1], but stark disagreement previous laser [2]. Preliminary measurements show strong depression on mixtures Fe FeS, whereas were observed melt close the iron. Kraut-Kennedy relationship [3], which temperature linear function volume, successfully tested this study Li, Na, K, Fe, compressions > 30%. At 1.36 (core-mantle boundary, CMB) are estimated 3670, 3260 3060 (± 100) K respectively. Assuming outer core compositions 60% 40% or solid solution system, CMB, side, would be 3300 200 K), compared bottom mantle 2650 ± 100 K. If these systems exhibit eutectic behaviour, gradient through substantially higher than adiabatic order maintain thermal boundary CMB. present data, experimental constraints suggest inner core-outer nearly 4200