Ni-Pt-Ge-Rich Fremdlinge; indicators of a turbulent early solar nebula

Abstract

One of the oddest aspects of CAis is the presence of Fremdlinge-complex aggregates of refractory metal alloys and volatile oxides and sulfides. In a series of recent studies of Fremdlinge we have provided evidence that (I) they are not isotopically anomalous and presumably formed in the solar nebula, (2) they were formed as solid objects before any of the major phases in CAis, (3) processes involved in their formation , prior to incorporation in CAis. included oxidation and reduction both at high and low temperatures, and (4) their phase assemblages and reaction textures place strict constraints on the maximum temperatures and cooling rates during CAl formation (Armstrong et al., 1984, 1985a, 1985b; Hutcheon et al., 1985).