Index Catalog // ScholarsArchive@OSU

Erosion by rivers and transport pathways in the ocean: A provenance tool using 40Ar--39Ar incremental heating on fine-grained sediment

Creator:: VanLaningham, Sam, Duncan, Robert A., and Pisias, Nicklas G.
Abstract:: We use Ar-40-Ar-39 incremental heating to fingerprint bulk fluvial sediment entering the northeast Pacific Ocean, with the long-term intent of tracking sediment source and transport changes from the terrestrial system to the marine environment through time. We show reproducible age spectra from individual rivers accounting for the majority of sediment...
Resource Type:: Article
Full Text:: Blusztajn, 2005; Kuhlemann et al., 2004]. JOURNAL OF GEOPHYSICAL RESEARCH, VOL. 111, F04014, doi:10.1029

⁴⁰Ar/³⁹Ar geochronology of silicic and basic volcanic rocks on the margins of the North Atlantic

Creator:: Sinton, C. W., Hitchen, K., and Duncan, Robert A.
Abstract:: At the submerged margins of the North Atlantic, andesitic to dacitic and basaltic volcanic rocks occur together. The silicic rocks were derived by processes requiring the presence of continental crust (crustal anatexis and/or contamination of mafic magmas) while the majority of the basaltic lavas had little or no contact with...
Resource Type:: Article
Full Text:: . Scottish Journal of Geology 27, 113–25. BERGGREN, W. A., KENT, D. V., SWISHER, C. C. & AUBREY, M.-P. 1995

Chronology and Geochemistry of Lavas from the Nazca Ridge and Easter Seamount Chain: an ∼30 Myr Hotspot Record

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:: ESC, and the inset shows an enlarged view of the elbow region connecting the two. JOURNAL OF

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:: . G3G3GeochemistryGeophysicsGeosystems Published by AGU and the Geochemical Society AN ELECTRONIC JOURNAL OF THE EARTH SCIENCES

Effective elastic thickness of the lithosphere along the Easter Seamount Chain

Creator:: Kruse, Sarah E., Liu, Zhengrong J., Naar, David F., and Duncan, Robert A.
Abstract:: Bathymetry and gravity data collected during Legs 5, 6, and 7 of the 1993 GLORIA Expedition and the recently released 2-min altimetry-derived global gravity grid are used to determine the effective elastic thickness of the lithosphere along the Easter Seamount Chain (ESC). Forward modeling, admittance, and coherence methods yield consistent...
Resource Type:: Article
Full Text:: Seamount Chain JOURNAL OF GEOPHYSICAL RESEARCH, VOL. 102, NO. B12, PAGES 27,305-27,317, DECEMBER 10, 1997

Distribution of recent volcanism and the morphology of seamounts and ridges in the GLIMPSE study area: implications for the lithospheric cracking hypothesis for the origin of intraplate, non-hotspot volcanic chains

Creator:: Forsyth, Donald W., Harmon, Nicholas, Scheirer, Daniel S., and Duncan, Robert A.
Abstract:: Lithospheric cracking by remotely applied stresses or thermoelastic stresses has been suggested to be the mechanism responsible for the formation of intraplate volcanic ridges in the Pacific that clearly do not form above fixed hot spots. As part of the Gravity Lineations Intraplate Melting Petrology and Seismic Expedition (GLIMPSE) project...
Resource Type:: Article
Full Text:: preexisting fracture zone traces has not been found [Goodwillie and Parsons, 1992; Gans et al., JOURNAL OF

Precise dating of the Holmatindur cooling event in eastern Iceland: Evidence for mid-Miocene bipolar glaciation

Creator:: Duncan, Robert A. and Helgason, J.
Abstract:: A succession of basaltic lavas, volcaniclastic sediments, and lignite beds in the Holmatindur region of eastern Iceland provides the means for tying magnetic reversal stratigraphy and a record of major North Atlantic cooling to a precise radiometric timescale. A prominent part of the section is the Holmatindur classic bed, which...
Resource Type:: Article
Full Text:: Iceland: Evidence for mid‐Miocene bipolar glaciation JOURNAL OF GEOPHYSICAL RESEARCH, VOL. 103

Geochronology of age-progressive volcanism of the Oregon High Lava Plains : implications for the plume interpretation of Yellowstone

Creator:: Jordan, Brennan T., Grunder, Anita L., Duncan, Robert A., and Deino, Alan L.
Abstract:: The High Lava Plains province (HLP) is a late Cenozoic bimodal volcanic field at the northern margin of the Basin and Range province in southeastern Oregon that hosts a westward younging trend of silicic volcanism that crudely mirrors northeastward migration of silicic volcanism along the Yellowstone–Snake River Plain (YSRP) trend....
Resource Type:: Article
Full Text:: the Basin and Range extensional province from the less extended Blue Mountain province JOURNAL OF

Geochronology of Galapagos seamounts

Creator:: Sinton, Christopher W., Christie, David M., and Duncan, Robert A.
Abstract:: Lavas from seamounts of the central Galápagos Platform and the Carnegie Ridge increase in age with distance from the western edge of the platform, consistent with a hotspot model for the generation of these features. The areal distribution of seamount ages suggests that the pattern of dispersed volcanism seen on...
Resource Type:: Article
Full Text:: Geochronology of Galápagos seamounts JOURNAL OF

High-resolution ⁴⁰Ar/³⁹Ar dating of the oldest oceanic basement basalts in the western Pacific basin

Creator:: Koppers, Anthony A. P., Staudigel, Hubert, and Duncan, Robert A.
Abstract:: We report new ⁴⁰Ar/³⁹Ar ages for the oldest Pacific oceanic floor at Ocean Drilling Program Site 801C in the Pigafetta basin and Site 1149D close to the Izu-Bonin subduction zone in the Nadezhda basin. These ages were determined by applying high-resolution incremental heating experiments (including 15–30 heating steps) to better...
Resource Type:: Article
Full Text:: Published by AGU and the Geochemical Society AN ELECTRONIC JOURNAL OF THE EARTH SCIENCES Geochemistry

ScholarsArchive@OSU

Erosion by rivers and transport pathways in the ocean: A provenance tool using 40Ar--39Ar incremental heating on fine-grained sediment

⁴⁰Ar/³⁹Ar geochronology of silicic and basic volcanic rocks on the margins of the North Atlantic

Chronology and Geochemistry of Lavas from the Nazca Ridge and Easter Seamount Chain: an ∼30 Myr Hotspot Record

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

Effective elastic thickness of the lithosphere along the Easter Seamount Chain

Distribution of recent volcanism and the morphology of seamounts and ridges in the GLIMPSE study area: implications for the lithospheric cracking hypothesis for the origin of intraplate, non-hotspot volcanic chains

Precise dating of the Holmatindur cooling event in eastern Iceland: Evidence for mid-Miocene bipolar glaciation

Geochronology of age-progressive volcanism of the Oregon High Lava Plains : implications for the plume interpretation of Yellowstone

Geochronology of Galapagos seamounts

High-resolution ⁴⁰Ar/³⁹Ar dating of the oldest oceanic basement basalts in the western Pacific basin

Limit your search

Academic Affiliation

Creator

Date

Decade

Language

Peer Reviewed

Resource Type

Rights Statement

Search Constraints

Search Results

Limit your search