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Jim Gill currently has two research foci: the chemical evolution of continental and oceanic crust, and short-lived radionuclides in young volcanic rocks.
The first involves study of Quaternary volcanic rocks in various tectonic settings, which currently include subduction-related rocks in the Fiji-Tonga-Kermadec, Mariana-Izu-Kuriles, MORB at the Endeavour and Axial segments of the Juan de Fuca Ridge, and continental rift-related rhyolites in northeast China. Some of these are marine projects, using submersibles, ODP, and conventional expeditions. Projects involve fieldwork, elemental analysis by XRF and ICPMS, mineral analysis by EPMA, and Sr-Nd-Pb-Hf isotope ratio analyses. See his webpage for more details.
His second focus is the use of short-lived decay of U and Th, and Th isotope ratios, to evaluate the processes and time-scales of magma formation, sea-level history, and groundwater response to tectonics. Two of the program's mass spectrometers are outfitted with pulse-counting capabilities to permit detection of short-lived nuclides of these elements. Current studies span MORB, OIB, and island arc rocks, and topics such as the controls of Th-U-Ra partitioning, source tracers, the age of magma at the time of its eruption, and Late Quaternary geochronology.
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Geological Society of America Abstracts with Programs (2021)
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