Abstract
Fourteen whole-rock samples from three traverses through the contact aureole of the Stillwater Complex were analyzed for Rb, Sr and 87Sr/ 86Sr. Twelve of these samples yielded an age of 2750 ± 45m.y.; ( 87Sr/ 86Sr) 0 = 0.705 ± 0.003 (2σ) . In addition one whole rock and a biotite separate derived from it gave an age of 2544 m.y.; ( 87Sr/ 86Sr) 0 = 0.714 . These data support a minimum age of 2750 m.y. for the intrusion of the complex.
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