Abstract
Reaction between chrome spinel and its supernatant magma due to changes in magmatic composition or temperature is well known; its effects can be observed in these rocks. However, evidence of solid-solid reaction between chrome spinels and enclosing olivine is also present, in the form of relict diffusion profiles in some of the olivines, and an orthopyroxene reaction product rimming the spinel. In addition, the Rhum specimens contain rims of plagioclase resulting from solid-liquid reaction around chrome spinels within the margins of olivine. Detailed microprobe traverses and analysis of reaction products have been made in an attempt to determine the equations for these reactions.
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