HR: 09:15h
AN: MR31D-06 INVITED    [Abstracts]
TI: Liquidus Temperatures in the Iron - Sulfur System and Melting of Fe3S at High Pressure
AU: * Seagle, C T
EM: seagle@uchicago.edu
AF: Dept. of Geophysical Sciences The University of Chicago, 5734 S. Ellis Ave., Chicago, IL 60637, United States
AU: Heinz, D L
EM: heinz@uchicago.edu
AF: Dept. of Geophysical Sciences The University of Chicago, 5734 S. Ellis Ave., Chicago, IL 60637, United States
AU: Campbell, A J
EM: ajc@umd.edu
AF: Dept. of Geology, University of Maryland, College Park, MD 20742, United States
AU: Miller, N
EM: namiller@geol.umd.edu
AF: Dept. of Geology, University of Maryland, College Park, MD 20742, United States
AU: Prakapenka, V B
EM: prakapenka@cars.uchicago.edu
AF: The University of Chicago, CARS, Building 434A 9700 S. Cass Ave., Argonne, IL 60439, United States
AB: The details of binary iron-light element systems at pressures relevant to the core can be used to constrain core composition and temperature. We have conducted several experiments in the iron-sulfur system using the diamond anvil cell. Compositions of 10 and 16 weight percent sulfur were used with angle dispersive x-ray diffraction and double-sided laser heating at Sector 13 of the Advanced Photon Source. Melting was determined by the disappearance of diffraction lines associated with the liquidus phase upon raising the temperature above the liquidus, and the reappearance of those reflections upon lowering the temperature below the liquidus. Fe3S melts incongruently at 21 GPa and continues this behavior up to higher pressures. Liquidus temperatures at 10 wt. % sulfur have been determined up to 155 GPa.
DE: 1015 Composition of the core
DE: 3924 High-pressure behavior
DE: 3954 X-ray, neutron, and electron spectroscopy and diffraction
DE: 5134 Thermal properties
SC: Mineral and Rock Physics [MR]
MN: 2007 Fall Meeting