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Each mass spectrometer has dedicated ion optics sources for Re and Pt filaments.
The HPA is used for high temperature digestions of samples for Os isotope and highly siderophile element measurement.
Images of the Anton Paar high-pressure asher (HPA) at the University of Maryland.
(a) The HPA as installed beneath its custom built extraction hood.
In combination with analysis of the clay mineralogy of catchment rocks and sediments, we suggest that the Central Basin sedimentary rocks were derived from two sources.
One source is Proterozoic sediments derived from Greenlandic basement rocks which are rich in illite and have high Nd values.This study demonstrates that the Nd isotopic composition of stream suspended sediments exhibits seasonal variation, which likely mirrors longer-term hydrological changes, with implications for source provenance studies based on fixed end-members through time.