Possible reasons for solar oddity
Bengt Gustafsson

I shall comment on various possible explanations for the departure of the solar elemental composition from that of the majority of solar-type stars:

1. dust cleansing of primordial solar nebula,
2. cleansing of the protoplanetary disk by planet formation in combination with a long-lived disk or early retraction of the deep solar convection zone, e.g. due to episodic accretion
3. galactic chemical evolution in combination with migration.