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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:: : 1525-2027 Copyright 2003 by the American Geophysical Union 1 of 20 Koppers, A. A. P., H. Staudigel

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:: Copyright 1998 by the American Geophysical Union Paper number 98JB00753. 0148-0227/98/98JB-00753 $09.00

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:: eruption of back arc and boninitic magmas after that time. ©2012. American Geophysical Union. All Rights

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:: of Wooster, Wooster, Ohio, USA. Copyright 2004 by the American Geophysical Union. 0148-0227/04

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:: University, Corvallis, Oregon, USA. Copyright 2006 by the American Geophysical Union. 0148-0227/06

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

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

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....
Resource Type:: Article
Full Text:: /or variations in Copyright 2011 by the American Geophysical Union 1 of 21 the average degree of

Evolution of the Walvis Ridge-Rio Grande rise hot spot system: implications for African and South American plate motions over plumes

Creator:: O'Connor, John M. and Duncan, Robert A.
Abstract:: Crystallization ages of volcanic rocks, dredged or drilled from the Walvis Ridge (ten sites) and the Rio Grande Rise (one site), have been determined by the ⁴⁰Ar/³⁹Ar incremental heating technique. The fundamentally age-progressive distribution of these basement ages suggests a common hot spot source for volcanism on the island of...
Resource Type:: Article

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:: for Full Article Copyright 2009 by the American Geophysical Union 1 of 17 Index Terms: 8416

ScholarsArchive@OSU

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

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

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

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

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

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

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

Insights into mantle composition and mantle melting beneath mid‐ocean ridges from postspreading volcanism on the fossil Galapagos Rise

Evolution of the Walvis Ridge-Rio Grande rise hot spot system: implications for African and South American plate motions over plumes

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

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