Siderophile element concentrations in the silicate portions of the Earth, Mars and Moon range from very well to rather poorly constrained. In this section I’ll provide an overview of what we know of siderophile element abundances in the silicate portions of these planetary bodies, as well as two asteroids, and what these abundances may mean with regard to the origin of these bodies, their differentiation histories, and their chemical evolution since primary differentiation.

In order to consider the origin of the siderophile elements in the bulk silicate Earth (BSE) we must first try to define their absolute and relative abundances...

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