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Angular distributions are reported for 3 Ar and '~X e produced by the interaction of 8-GeV Ne and 25-GeV ' C ions with Au. A shift from a forward to a sideward peaked distribution is observed for Ar, similar to that known to occur for incident protons over the same energy interval. Analysis of these data and those for Z=S fragments indicate that reactions leading to heavy fragment emission become more peripheral as bombarding energies increase. A mechanistic analysis is presented which explores the ranges of applicability of several models and the reliability of their predictions to fragmentation reactions induced by both energetic heavy ions and protons.

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