It is most fitting that this volume be dedicated to Professor Robert N. Clayton who, among geochemists and cosmochemists, could easily wear the name “Mr. Oxygen.” His 1973 discovery (with coauthors Larry Grossman and Toshiko Mayeda), that calcium-, aluminum-rich inclusions (CAIs) in the Allende meteorite have oxygen isotopic (specifically,16O-rich) compositions that cannot be explained by simple physical processes such as condensation or evaporation, led to the more general discovery of isotope anomalies in CAIs. Working with his long-time associate Tosh Mayeda and many other colleagues over the years, Bob demonstrated the power of 3-isotope oxygen measurements to fingerprint...

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