The timing of my trek home in the dark would have been in the late 1970’s, and trace element partitioning had been practised for only a decade, or less. In the late 1960’s or early 1970’s Mike Drake and Dan Weill at the University of Oregon began doping experiments with rare earth elements (REE) and Sr at wt. % levels (Jones et al., 2015). These concentrations were necessary in order to measure D’s using the electron microprobe. Ion probes and laser ablation ICP-MS would only emerge decades later as quantitative instruments. The spatial resolution of the wt....

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