Index Catalog // ScholarsArchive@OSU

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

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:: Oregon High Lava Plains: Implications for the plume interpretation of Yellowstone Brennan T. Jordan1

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:: Nazca Ridge and Easter Seamount Chain: an �30 Myr Hotspot Record JYOTIRANJAN S. RAY1,2*, JOHN J

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:: Oceanography, University of California, San Diego, La Jolla, California 92093, USA John J. Mahoney School of

Pervasive mantle plume head heterogeneity: Evidence from the late Cretaceous Caribbean-Colombian oceanic plateau

Creator:: Kerr, Andrew C, Tarney, John, Kempton, Pamela D., Spadea, Piera, Nivia, Alvaro, Marriner, Giselle F., and Duncan, Robert A.
Abstract:: In SW Colombia picritic pillow lavas and tuffs, as well as breccias composed of picritic clasts, occur interspersed with basalts of the Central Cordillera and represent accreted portions of the similar to 90 Ma Colombian/Caribbean oceanic plateau (CCOP). We present new geochemical data for these picrites and high-MgO basalts from...
Resource Type:: Article
Full Text:: , AGU, Washington, D. C., 1988. Donnelly, T. W., W. Melson, R. Kay, and J. J. W. Rogers, Basalts and

Trace element abundances in the Rock Canyon Anticline, Pueblo, Colorado, marine sedimentary section and their relationahip to Caribbean plateau construction and oxygen anoxic event 2

Creator:: Snow, Laura J., Duncan, Robert A., and Bralower, Timothy J.
Abstract:: Rapid eruption of submarine lava flows during formation of the Caribbean plateau correlates closely with ocean anoxic event 2 (OAE2), which bracketed the Cenomanian/Turonian boundary (~93.5 Ma). These events also correspond with a positive excursion in carbon isotopic composition of seawater. Hydrothermal activity associated with large-scale submarine volcanism may have...
Resource Type:: Article
Full Text:: . J., R. A. Duncan, and T. J. Bralower (2005), Trace element abundances in the Rock Canyon Anticline

Geochemistry and geochronology of ancient southeast Indian and southwest Pacific seafloor

Creator:: Pyle, D. G., Christie, David M., Mahoney, J. J., and Duncan, Robert A.
Abstract:: Within the Australian-Antarctic Discordance (AAD), a boundary exists between isotopically defined “Pacific-type” and “Indian-type” mid-ocean ridge basalt (MORB) erupted along the Southeast Indian Ridge (SEIR). This boundary has migrated westward beneath the easternmost AAD spreading segment at a minimum rate of 25 mm/yr since 4 Ma; however, its long-term history...
Resource Type:: Article
Full Text:: University, Corvallis J. J. Mahoney Department of Geology and Geophysics, Woods Hole Oceanographic

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:: . ———————————— Theme: Oceanic Inputs to the Subduction Factory Guest Editors: Terry Plank and John Ludden 1

Temporal variations in plate convergence and eruption rates in the Western Cascades, Oregon

Creator:: Verplanck, Emily P. and Duncan, Robert A.
Abstract:: New K-Ar age determinations on basalts, basaltic andesites, and ash flow tuffs from the central Western Cascades in Oregon range in age from 32 to 3 Ma. The ages decrease from west to east and with increasing elevation. Volcanism has been continuous throughout the evolution of the Western Cascades, with...
Resource Type:: Article
Full Text:: volcanism in the central Oregon Cascade Range, Geolom_v, %, 585-589, 1974. Minster, J. B., and T. H

Hotspots, mantle plumes, flood basalts, and true polar wander

Creator:: Duncan, Robert A. and Richards, M. A.
Abstract:: Persistent, long‐lived, stationary sites of excessive mantle melting are called hotspots. Hotspots leave volcanic trails on lithospheric plates passing across them. The global constellation of fixed hotspots thus forms a convenient frame of reference for plate motions, through the orientations and age distributions of volcanic trails left by these melting...
Resource Type:: Article
Full Text:: ] now requires significantly less motion between Pacific and other hotspots (5-10 mm/yr (J. Stock

ScholarsArchive@OSU

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

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

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

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

Pervasive mantle plume head heterogeneity: Evidence from the late Cretaceous Caribbean-Colombian oceanic plateau

Trace element abundances in the Rock Canyon Anticline, Pueblo, Colorado, marine sedimentary section and their relationahip to Caribbean plateau construction and oxygen anoxic event 2

Geochemistry and geochronology of ancient southeast Indian and southwest Pacific seafloor

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

Temporal variations in plate convergence and eruption rates in the Western Cascades, Oregon

Hotspots, mantle plumes, flood basalts, and true polar wander

Limit your search

Academic Affiliation

Creator

Date

Decade

Language

Peer Reviewed

Resource Type

Rights Statement

Search Constraints

Search Results

Limit your search