It is nearly impossible to discuss siderophile elements in major planetary bodies like the Earth, Moon and Mars without first discussing the general behaviour of these elements in meteoritic systems. A good place to start is with chondritic meteorites. Chondrites are often described as cosmic aggregates. This is because they consist of a variety of distinct components that may not have been made in the same place (Shu et al., 1997), were probably not all made at the same time (Amelin et al., 2002), and in some cases were not even made from the...

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