HR: 0800h
AN: GP21B-0506    [Abstracts]
TI: Low Temperature Magnetic Properties of iImenite-Hematite Solid Solution Members
AU: * McEnroe, S A
EM: suzanne.mcenroe@ngu.no
AF: Geological Survey of Norway, NGU, Trondheim, N-7491, Norway
AU: Fabian, K
EM: karl.fabin@ngu.no
AF: Geological Survey of Norway, NGU, Trondheim, N-7491, Norway
AU: Robinson, P
EM: peter.robinson@ngu.no
AF: Geological Survey of Norway, NGU, Trondheim, N-7491, Norway
AU: Burton, B P
EM: Benjamin.burton@nist.gov
AF: NIST, A226-223, Gaithersburg, MD 20899, United States
AB: Magnetic properties of the ilmenite-hematite system change dramatically with increasing ilmenite content. We present new data on synthetic and natural samples with compositions ranging from nearly pure hematite to ilmenite 98%. We also characterize the rock magnetic properties in the ilmenite-rich side of the solid solution at temperatures, from 400 K to 5K. A combination of Mossbauer, x´ray, and magnetic data from synthetic and natural samples is used to Identifying which rock magnetic measurements are best for estimating various phase transitions and crossovers; and a low´temperature constrained equilibrium phase diagram is drawn.
DE: 1519 Magnetic mineralogy and petrology
DE: 1540 Rock and mineral magnetism
SC: Geomagnetism and Paleomagnetism [GP]
MN: 2007 Fall Meeting