Index Catalog // ScholarsArchive@OSU

Creator:: Ray, Jyotiranjan S., Mahoney, John J., Duncan, Robert A., Ray, Jyotisankar, Wessel, Paul, and Naar, David F.
Abstract:: The Easter Seamount Chain and Nazca Ridge are two of the most conspicuous volcanic features on the Nazca plate. Many questions about their nature and origin have remained unresolved because of a lack of geochronological and geochemical data for large portions of both chains. New ⁴⁰Ar⁻³⁹Ar incremental heating age determinations...
Resource Type:: Article
Full Text:: (Easter and Juan Fernandez) and includes two relict microplates (Mendoza and Bauer) and three major

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:: isotopic variations in lavas from the Juan Fernandez archi- pelago, Contrib. Mineral. Petrol., 115, 75–87

Creator:: Konrad, Kevin, Graham, David W., Thornber, Carl R., Duncan, Robert A., Kent, Adam J.R., and Al-Amri, Abdullah M.
Abstract:: Extensive volcanic fields on the western Arabian Plate have erupted intermittently over the last 30 Ma following emplacement of the Afar flood basalts in Ethiopia. In an effort to better understand the origin of this volcanism in western Saudi Arabia, we analyzed ³He/⁴He, and He, CO₂ and trace element concentrations...
Full Text:: , including multiple phases of the same rock). The results provide a test of the presence of Afar plume

ScholarsArchive@OSU