Distribution of tungsten and molybdenum between metal, silicate, and sulphide phases of meteorites

Title Distribution of tungsten and molybdenum between metal, silicate, and sulphide phases of meteorites
Author: Imamura, Keiko & Honda, Masatake
Geochimica et Cosmochimica Acta, 1976
1976
http://www.sciencedirect.com/science/article/pii/0016703776900491
More details: The concentrations of W, Mo, Co and Ni have been determined by neutron activation analysis in the separated metal, silicate and troilite of twelve chondrites?��nine ordinary, two enstatite and one carbonaceous. Concentration ratios of W and Mo in silicate relative to metal are 0.03?��0.6 and 0.05?��0.55, respectively, and those of W in the troilite relative to the metal are 0.01?��0.2. The contents of Mo in the troilite are nearly equal to those in the metal. Co and Ni are more depleted than W and Mo both in the silicate and troilite. Thermodynamic considerations have been made for determined concentration ratios. In some L-chondrites, W is depleted in the silicate by a factor of three to four of the value estimated from the correlation line between H- and LL-chondrites. This tendency seems to suggest a relatively higher temperature in the thermal history of these L-chondrites.