Index Catalog // ScholarsArchive@OSU

Spatial and temporal distribution of a C-like asthenoshpheric component in the Rano Rahi Seamount Field, East Pacific Rise, 15°-19°S

Creator:: Hall, L. S., Mahoney, J. J., Sinton, J. M., and Duncan, Robert A.
Abstract:: Lavas of the Rano Rahi seamount field define a Nd-Pb-Sr isotopic array that connects, and substantially overlaps, the arrays of the nearby East Pacific Rise axis and 5.6–28 Ma lavas of the Pukapuka ridge system, situated between the seamount field and French Polynesia. Dating of Rano Rahi samples by ⁴⁰Ar-³⁹Ar...
Resource Type:: Article
Full Text:: 2006. Hall, L. S., J. J. Mahoney, J. M. Sinton, and R. A. Duncan (2006), Spatial and temporal

Radiometric ages for basement rocks from the Emperor Seamounts, ODP Leg 197

Creator:: Duncan, Robert A. and Keller, Randall A.
Abstract:: The Hawaiian-Emperor seamount chain is the ‘‘type’’ example of an age-progressive, hot spotgenerated intraplate volcanic lineament. However, our current knowledge of the age distribution within this province is based largely on radiometric ages determined several decades ago. Improvements in instrumentation, sample preparation methods, and new material obtained by recent drilling...
Resource Type:: Article
Full Text:: 1.1-Ga rhyolite, Geochim. Cosmochim. Acta, 64, 73–98. Pringle, M. S., and R. A. Duncan (1995

Implications of a nonlinear ⁴⁰Ar/³⁹Ar age progression along the Louisville seamount trail for models of fixed and moving hot spots

Creator:: Koppers, Anthony A. P., Duncan, Robert A., and Steinberger, Bernhard
Abstract:: The Louisville seamount trail has been recognized as one of the key examples of hot spot volcanism, comparable to the classic volcanic Hawaiian-Emperor lineaments. The published total fusion ⁴⁰Ar/³⁹Ar data of Watts et al. [1988] showed an astonishing linear age progression, firmly establishing Louisville as a fixed hot spot in...
Resource Type:: Article
Full Text:: California, San Diego, La Jolla, CA 92093-0225, USA (akoppers@ucsd.edu) Robert A. Duncan College of Oceanic

Seamount morphology in the Bowie and Cobb hot spot trails, Gulf of Alaska

Creator:: Chaytor, Jason D., Keller, Randall A., Duncan, Robert A., and Dziak, Robert P.
Abstract:: Full-coverage multibeam bathymetric mapping of twelve seamounts in the Gulf of Alaska reveals that they are characterized by flat-topped summits (rarely with summit craters) and by terraced, or step-bench, flanks. These summit plateaus contain relict volcanic features (e.g., flow levees, late-stage cones, and collapse craters) and as such must have...
Resource Type:: Article
Full Text:: , Corvallis, Oregon 97331, USA Robert A. Duncan College of Oceanic and Atmospheric Sciences, Oregon State

Insights into the late Cenozoic configuration of the laurentide Ice Sheet from ⁴⁰Ar/³⁹Ar dating of glacially transported minerals in midcontinent tills

Creator:: Roy, Martin, Clark, Peter U., Duncan, Robert A., and Hemming, Sidney R.
Abstract:: Glacial sedimentary sequences in the north central United States record multiple advances of the Laurentide Ice Sheet (LIS) since ~2 Ma. Although the tills found in these sequences were deposited by southward flowing glacial lobes, little information is available on the geometry of flow lines in the interior of the...
Resource Type:: Article
Full Text:: 2007; Published 18 September 2007. Roy, M., P. U. Clark, R. A. Duncan, and S. R. Hemming (2007

Bimodal volcanism of the High Lava Plains and Northwestern Basin and Range of Oregon: Distribution and tectonic implications of age-progressive rhyolites

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

Age of the Batoka basalts, norther Zimbabwe, and the duration of Karoo Large Igneous Province magmatism

Creator:: Jones, D. L., Duncan, Robert A., Briden, J. C., Randall, D. E., and MacNiocaill, C.
Abstract:: Analysis of the Bakota basalts exposed in the Zambezi Gorge some 40 km east of Victoria Falls characterizes them as high Fe, moderately high Ti, and low K, P, and Zr tholeiites. The ⁴⁰Ar-³⁹Ar age determinations are tightly clustered at 180-179 Ma. All of the lavas that were samples have...
Resource Type:: Article
Full Text:: NRM N UP 1.0 Am-1 E a) W S DOWN b) NRM NRM 490oC 610oC N UP E 0.5 Am W c) NRM 20 mT

Cretaceous-to-recent record of elevated ³He/⁴He along the Hawaiian-Emperor volcanic chain

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

Five million years of compositionally diverse, episodic volcanism : construction of Davidson Seamount atop an abandoned spreading center

Creator:: Clague, D. A., Paduan, J. B., Duncan, Robert A., Huard, J. J., Davis, A. S., Castillo, P. R., Lonsdale, P., and DeVogelaere
Abstract:: Davidson Seamount, a volcano located about 80 km off the central California coast, has a volume of ~320 km³ and consists of a series of parallel ridges serrated with steep cones. Davidson was sampled and its morphology observed during 27 ROV Tiburon dives. During those dives, 286 samples of lava,...
Resource Type:: Article
Full Text:: September 2009; Published 16 December 2009. Clague, D. A., J. B. Paduan, R. A. Duncan, J. J. Huard, A. S

New ⁴⁰Ar/³⁹Ar age progression for the Louisville hot spot trail and implications for inter–hot spot motion

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

ScholarsArchive@OSU

Spatial and temporal distribution of a C-like asthenoshpheric component in the Rano Rahi Seamount Field, East Pacific Rise, 15°-19°S

Radiometric ages for basement rocks from the Emperor Seamounts, ODP Leg 197

Implications of a nonlinear ⁴⁰Ar/³⁹Ar age progression along the Louisville seamount trail for models of fixed and moving hot spots

Seamount morphology in the Bowie and Cobb hot spot trails, Gulf of Alaska

Insights into the late Cenozoic configuration of the laurentide Ice Sheet from ⁴⁰Ar/³⁹Ar dating of glacially transported minerals in midcontinent tills

Bimodal volcanism of the High Lava Plains and Northwestern Basin and Range of Oregon: Distribution and tectonic implications of age-progressive rhyolites

Age of the Batoka basalts, norther Zimbabwe, and the duration of Karoo Large Igneous Province magmatism

Cretaceous-to-recent record of elevated ³He/⁴He along the Hawaiian-Emperor volcanic chain

Five million years of compositionally diverse, episodic volcanism : construction of Davidson Seamount atop an abandoned spreading center

New ⁴⁰Ar/³⁹Ar age progression for the Louisville hot spot trail and implications for inter–hot spot motion

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