Thermal metamorphism of primitive meteorites—III. Ten trace elements in Krymka L3 chondrite heated at 400–1000°C

Partial melting and melt migration in the acapulcoite-lodranite parent body

“…A consequence of this segmented texture is that some veins appear in the plane of the thin section as only troilite or, more rarely, only Fe,Ni metal. These veins are very similar to those produced during heating for 1 week at 900°C of the Krymka (L3) chondrite (Ikramuddin et al, 1977;McSween et al, 1978). The crosscutting relationship between the Fe,Ni-FeS veins and plagioclase in Acapulco implies that temperatures were insufficient to melt silicates.…”

Tellurium isotopic composition of the early solar system—A search for effects resulting from stellar nucleosynthesis, 126Sn decay, and mass-independent fractionation

“…Such fractionations are, in principle, also possible for Te, which is moderately volatile with a 50% condensation temperature of 709 K (Lodders, 2003). Heating experiments have furthermore shown that both Cd and Te can be redistributed and partially lost from chondrites by thermal metamorphism (Ngo and Lipschutz, 1980) and Ikramuddin et al (1977) found that ϳ95%-99% of the Te was lost from the L3 chondrite Krymka in the temperature range of 400 to 1000°C. Mobilization of Cd, however, already begins at ϳ400°C, whereas Te requires temperatures of at least 700°C (Ngo and Lipschutz, 1980).…”

Chemical studies of L chondrites. VI: variations with petrographic type and shock-loading among equilibrated falls

“…While volatile elements are thermally mobile ones and vice versa, their lability orders differ. In this study we choose to order them (as above) by increasing lability at 1000°C, both because this has been experimentally determined (e.g., Ikramuddin et al, 1977) and because compositional trends in L4-6 chondrites confirm this tertiary process as a dominant one (Walsh and Lipschutz, 1982;Huston and Lipschutz, 1984).…”