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:: asthenospheric component in the Rano Rahi Seamount Field, East Pacific Rise, 15�–19�S L. S. Hall, J. J. Mahoney

Identifying cryptotephra units using correlated rapid, nondestructive methods: VSWIR spectroscopy, X-ray fluorescence, and magnetic susceptibility

Creator:: McCanta, Molly C., Hatfield, Robert G., Thomson, Bradley J., Hook, Simon J., and Fisher, Elizabeth
Abstract:: Understanding the frequency, magnitude, and nature of explosive volcanic eruptions is essential for hazard planning and risk mitigation. Terrestrial stratigraphic tephra records can be patchy and incomplete due to subsequent erosion and burial processes. In contrast, the marine sedimentary record commonly preserves a more complete historical record of volcanic activity...
Resource Type:: Article
Full Text:: methods: VSWIR spectroscopy, X-ray fluorescence, and magnetic susceptibility Molly C. McCanta1, Robert G

Prolonged plume volcanism in the Caribbean Large Igneous Province: New insights from Curaçao and Haiti

Creator:: Loewen, Matthew W., Duncan, Robert A., Kent, Adam J. R., and Krawl, Kyle
Abstract:: We present 36 new ⁴⁰Ar-³⁹Ar incremental heating age determinations from the Caribbean Large Igneous Province (CLIP) providing evidence for extended periods of volcanic activity and suggest a new tectonomagmatic model for the province’s timing and construction. These new ⁴⁰Ar-³⁹Ar ages for the Curaçao Lava Formation (CLF) and Haiti’s Dumisseau Formation...
Resource Type:: Article

Cobalt-based age models of pelagic clay in the South Pacific Gyre

Creator:: Dunlea, Ann G., Murray, Richard W., Sauvage, Justine, Pockalny, Robert A., Spivack, Arthur J., Harris, Robert N., and D'Hondt, Steven
Abstract:: Dating pelagic clay can be a challenge due to its slow sedimentation rate, post-depositional alteration, and lack of biogenic deposition. Co-based dating techniques have the potential to create age models in pelagic clay under the assumption that the flux of non-detrital Co to the seafloor is spatially and temporally constant,...
Resource Type:: Article

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
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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:: State University, Corvallis, Oregon 97331, USA J. E. Lupton Pacific Marine Environmental Laboratory

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

Basalts erupted along the Tongan fore arc during subduction initiation: Evidence from geochronology of dredged rocks from the Tonga fore arc and trench

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:: from the Tonga fore arc and trench Sebastian Meffre, Trevor J. Falloon, and Tony J. Crawford ARC

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:: J. B. Paduan Monterey Bay Aquarium Research Institute, 7700 Sandholdt Road, Moss Landing, California

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:: Emperor Seamounts, ODP Leg 197 Robert A. Duncan and Randall A. Keller College of Oceanic and Atmospheric

ScholarsArchive@OSU

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

Identifying cryptotephra units using correlated rapid, nondestructive methods: VSWIR spectroscopy, X-ray fluorescence, and magnetic susceptibility

Prolonged plume volcanism in the Caribbean Large Igneous Province: New insights from Curaçao and Haiti

Cobalt-based age models of pelagic clay in the South Pacific Gyre

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

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

Basalts erupted along the Tongan fore arc during subduction initiation: Evidence from geochronology of dredged rocks from the Tonga fore arc and trench

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

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

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