Index Catalog // ScholarsArchive@OSU

Creator:: Ford, Mark T., Grunder, Anita L., and Duncan, Robert A.
Abstract:: Multiple episodes of Oligocene and younger silicic volcanism are represented in the high lava plateau of central and southeastern Oregon. From 12 Ma to Recent, volcanism is strongly bimodal with nearly equal volumes of basalt and rhyolite. It is characterized by moderate to high silica (SiO₂ > 72 wt. %)...
Resource Type:: Article
Full Text:: tectonic implications of age-progressive rhyolites Mark T. Ford, Anita L. Grunder, and Robert A. Duncan

Creator:: Koppers, Anthony A. P., Gowen, Molly D., Colwell, Lauren E., Gee, Jeffrey S., Lonsdale, Peter F., Mahoney, John J., and Duncan, Robert A.
Abstract:: In this study we present 42 new ⁴⁰Ar/³⁹Ar incremental heating age determinations updated age progression for the Louisville seamount trail. Louisville is the South Hawaiian‐Emperor seamount trail, both trails representing intraplate volcanism (~80 Ma to present) and being examples of primary hot spot lineaments. Our age‐progressive trend from 71 to...
Resource Type:: Article
Full Text:: . Colwell, J. S. Gee, P. F. Lonsdale, J. J. Mahoney, and R. A. Duncan (2011), New 40Ar/39Ar age progression

Creator:: Meffre, Sebastian, Falloon, Trevor J., Crawford, Tony J., Hoernle, Kaj, Hauff, Folkmar, Duncan, Robert A., Bloomer, Sherman H., and Wright, Dawn J.
Abstract:: A wide variety of different rock types were dredged from the Tonga fore arc and trench between 8000 and 3000 m water depths by the 1996 Boomerang voyage. ⁴⁰Ar-³⁹Ar whole rock and U-Pb zircon dating suggest that these fore arc rocks were erupted episodically from the Cretaceous to the Pliocene...
Resource Type:: Article
Full Text:: , T. J. Crawford, K. Hoernle, F. Hauff, R. A. Duncan, S. H. Bloomer, and D. J. Wright (2012), Basalts

Creator:: Price, Allison A., Jackson, Matthew G., Blichert-Toft, Janne, Blusztajn, Jerzy, Conatser, Christopher S., Konter, Jasper G., Koppers, Anthony A. P., and Kurz, Mark D.
Abstract:: Lau Basin basalts host an array of geochemical signatures that suggest incorporation of enriched mantle source material often associated with intraplate hotspots, but the origin of these signatures remain uncertain. Geochemical signatures associated with mantle material entrained from the nearby Samoan hotspot are present in northwest Lau Basin lavas, and...
Resource Type:: Article
Full Text:: , Christopher S. Conatser4, Jasper G. Konter5, Anthony A.P. Koppers4, and Mark D. Kurz6 1Department of Earth

Creator:: Koppers, Anthony A. P., Russell, Jamie A., Roberts, Jed, Jackson, Matthew G., Konter, Jasper G., Wright, Dawn J., Staudigel, Hubert, and Hart, Stanley R.
Abstract:: The volcanic origin of the Samoan archipelago can be explained by one of three models, specifically, by a hot spot forming over a mantle plume, by lithospheric extension resulting from complex subduction tectonics in the region, or by a combination of these two processes, either acting sequentially or synchronously. In...
Resource Type:: Article
Full Text:: , A. A. P., J. A. Russell, J. Roberts, M. G. Jackson, J. G. Konter, D. J. Wright, H. Staudigel, and S

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

Creator:: Streck, Martin J. and Grunder, Anita L.
Abstract:: Strongly bimodal, basalt-rhyolite volcanism of the High Lava Plains Province of Oregon followed the Middle Miocene flood basalts of the Pacific Northwest and extends to recent time. During the 8 m.y. of volcanism recorded in the central High Lava Plains, in western Harney Basin, three distinct mafic magmatic trends originate...
Resource Type:: Article
Full Text:: —HIGH LAVA PLAINS, OREGON 10.1029/2012GC004237 4 of 23 T ab le 1 (S am p le ). C he m ic al D at

Creator:: Hathorne, Ed C., Haley, Brian, Stichel, Torben, Grasse, Patricia, Zieringer, Moritz, and Frank, Martin
Abstract:: The rare earth elements (REEs) with their systematically varying properties are powerful tracers of continental inputs, particle scavenging intensity and the oxidation state of seawater. However, their generally low (similar to pmol/kg) concentrations in seawater and fractionation potential during chemical treatment makes them difficult to measure. Here we report a...
Resource Type:: Article
Full Text:: ) Points per mass 1 Dwell time 0.1 s Sweep time 2.12 s Isotopes monitored 23Na, 89Y, 115In, 137Ba, 139La

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