Hydromagmatic Processes and Platinum-Group Elements in Layered Intrusions. Alan Boudreau. Pp. 275. Cambridge University Press. 2019. ISBN 978-1-108416009.Hardcover, US$125.00. E-book, US$89.99.

A group of petrologists met in South Africa in 2018, on the holy ground of the Bushveld Complex, to hold a conference commemorating the 50th anniversary of the publication of Wager and Brow’s seminal text, Layered Igneous Rocks. A common opinion was that many of the fundamental problems in mafic and ultramafic cumulate rocks remain unsolved ever since Wager and Brown wrote their influential tome. One of those long-standing controversies is about the origin of cumulate stratiform platinum...

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