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Creator:: Keller, R. A., Graham, David W., Farley, K. A., Duncan, Robert A., and Lupton, J. E.
Abstract:: Helium isotopes are a robust geochemical tracer of a primordial mantle component in hot spot volcanism. The high ³He/⁴He (up to 35 RA, where RA is the atmospheric ³He/⁴He ratio of 1.39 X 10¯⁶) of some Hawaiian Island volcanism is perhaps the classic example. New results for picrites and basalts...
Resource Type:: Article
Full Text:: Technology, Pasadena, California 91125, USA R. A. Duncan College of Oceanic and Atmospheric Sciences, Oregon

Creator:: Detrick, R. S., Sinton, J. M., Ito, G., Canales, J. P., Behn, M., Blacic, T., Cushman, B., Dixon, J. E., Graham, David W., and Mahoney, J. J.
Abstract:: As the Galápagos hot spot is approached from the west along the Galápagos Spreading Center there are systematic increases in crustal thickness and in the K/Ti, Nb/Zr, ³He/⁴He, H₂O, and Na₂O content of lavas recovered from the spreading axis. These increases correlate with progressive transitions from rift valley to axial...
Resource Type:: Article
Full Text:: volcanological manifestations of plume-ridge interaction along the Galápagos Spreading Center R. S. Detrick

Creator:: Broadley, Michael W., Sumino, Hirochika, Graham, David W., Burgess, Ray, and Ballentine, Chris J.
Abstract:: Halogens are primarily located within surface reservoirs of the Earth; as such they have proven to be effective tracers for the identification of subducted volatiles within the mantle. Subducting lithologies exhibit a wide variety of halogen compositions, yet the mantle maintains a fairly uniform signature, suggesting halogens may be homogenized...
Resource Type:: Article
Full Text:: , the physical manifestation of the Hawaiian Plume, can be traced back to at least 76 Ma (Duncan

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