Abstract
The principle stratiform platinum group element deposits are the Merensky Reef and UG-2 chromitite of the Bushveld and the J-M Reef of the Stillwater Complexes. In the Bushveld Complex, cryptic variation in the MgNo of bronzite and in the An and Sr content of plagioclase within the Merensky cyclic unit, the apparent crossing of the plagioclase cotectic by the magmareponsible for this and other units, and variations in 87Sr/86Sr initial ratio, and, in the Stillwater Complex, the change in the order of liquidus phases, point to the involvement of at least two different magmas in each intrusion.
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