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Filtering by: Creator Duncan, Jennifer S. Remove constraint Creator: Duncan, Jennifer S. Has journal sim Geochemistry, Geophysics, Geosystems Remove constraint Has journal sim: Geochemistry, Geophysics, Geosystems Rights Statement Copyright Not Evaluated Remove constraint Rights Statement: Copyright Not Evaluated

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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...

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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...

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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...

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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...

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, 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...

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2007; Published 18 September 2007. Roy, M., P. U. Clark, R. A. Duncan, and S. R. Hemming (2007
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...

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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...

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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,...

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September 2009; Published 16 December 2009. Clague, D. A., J. B. Paduan, R. A. Duncan, J. J. Huard, A. S
Insights into mantle composition and mantle melting beneath mid‐ocean ridges from postspreading volcanism on the fossil Galapagos Rise

Creator:

Haase, Karsten M., Regelous, Marcel, Duncan, Robert A., Brandl, Philipp A., Stroncik, Nicole, and Grevemeyer, Ingo

Abstract:

New major and trace element and Sr, Nd, and Pb isotope data, together with ³⁹ Ar-⁴⁰Ar ages for lavas from the extinct Galapagos Rise spreading center in the eastern Pacific reveal the evolution in magma compositions erupted during slowdown and after the end of active spreading at a mid-ocean ridge....

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, Schlossgarten 5, D‐91054 Erlangen, Germany Robert A. Duncan College of Oceanic and Atmospheric Sciences, Oregon
Geologic history of the summit of Axial Seamount, Juan de Fuca Ridge

Creator:

Clague, David A., Dreyer, Brian M., Paduan, Jennifer B., Martin, Julie F., Chadwick, William W., Jr., Caress, David W., Portner, Ryan A., Guilderson, Thomas P., McGann, Mary L., Thomas, Hans, Butterfield, David A., and Embley, Robert W.

Abstract:

Multibeam (1 m resolution) and side scan data collected from an autonomous underwater vehicle, and lava samples, radiocarbon-dated sediment cores, and observations of flow contacts collected by remotely operated vehicle were combined to reconstruct the geologic history and flow emplacement processes on Axial Seamount’s summit and upper rift zones. The...

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College of Earth, Ocean, and Atmospheric Sciences1
College of Oceanic and Atmospheric Sciences1

Creator

Duncan, Robert A.9
Clague, D. A.2
Davis, A. S.2
Graham, David W.2
Keller, Randall A.2
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2010-20196
2000-200912

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English [eng]18

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Copyright Not Evaluated[remove]18

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