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Over the course of its 16 m.y. history, the Yellowstone hotspot has produced silicic magmas exhibiting systematic, and often sympathetic, variations in isotopic and chemical composition, temperature and frequency of eruption. Nd and Hf isotopic ratios vary systematically from initial eruptions at ∼16 Ma, contemporaneous with basaltic volcanism in eastern Oregon and Washington, to the present day Yellowstone...
This paper describes advances in isotopic measurements that have been made with an inductively coupled plasma source magnetic sector multiple collector mass spectrometer and presents results of new experiments aimed at further evaluating the instrument's capability. It is shown using standard solutions that trace element ratios such as Rb can be measured precisely without isotope dilution by comparison...
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