Index Catalog // ScholarsArchive@OSU

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

Hydrogeological responses to incoming materials at the erosional subduction margin, offshore Osa Peninsula, Costa Rica

Creator:: Kameda, Jun, Harris, Robert N., Shimizu, Mayuko, Ujiie, Kohtaro, Tsutsumi, Akito, Ikehara, Minoru, Uno, Masaoki, Yamaguchi, Asuka, Hamada, Yohei, Namiki, Yuka, and Kimura, Gaku
Abstract:: Bulk mineral assemblages of sediments and igneous basement rocks on the incoming Cocos Plate at the Costa Rica subduction zone are examined by X-ray diffraction analyses on core samples. These samples are from Integrated Ocean Drilling Program Expedition 334 reference Site U1381, ∼ 5 km seaward of the trench. Drilling...
Resource Type:: Article
Full Text:: , offshore Osa Peninsula, Costa Rica Jun Kameda1, Robert N. Harris2, Mayuko Shimizu3, Kohtaro Ujiie4, Akito

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

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:: vesicular glasses are translu- cent, light brown in color, and do not appear to be altered or leached, but

Thermal regime of the Costa Rican convergent margin: 1. Along‐strike variations in heat flow from probe measurements and estimated from bottom‐simulating reflectors

Creator:: Harris, Robert N., Grevemeyer, Ingo, and Ranero, César R.
Abstract:: The thermal structure of convergent margins provides information related to the tectonics, geodynamics, metamorphism, and fluid flow of active plate boundaries. We report 176 heat flow measurements made with a violin bow style probe across the Costa Rican margin at the Middle America Trench. The probe measurements are collocated with...
Resource Type:: Article
Full Text:: reflectors Robert N. Harris College of Oceanic and Atmospheric Sciences, Oregon State University, Corvallis

Heat flow along the NanTroSEIZE transect: Results from IODP Expeditions 315 and 316 offshore the Kii Peninsula, Japan

Creator:: Harris, Robert N., Schmidt‐Schierhorn, Friederike, and Spinelli, Glenn
Abstract:: [1] We report detailed thermal measurements undertaken during Integrated Ocean Drilling Program (IODP) Expeditions 315 and 316 along the Nankai Trough Seismogenic Zone Experiment (NanTroSEIZE) transect offshore the Kii Peninsula, Japan. Geothermal objectives included determining thermophysical rock properties of the cored material and characterizing the background thermal regime along this...
Resource Type:: Article
Full Text:: IODP Expeditions 315 and 316 offshore the Kii Peninsula, Japan Robert N. Harris College of Oceanic and

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

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

Evolution of the northeast Labrador Sea during the last interglaciation

Creator:: Winsor, Kelsey, Carlson, Anders E., Klinkhammer, Gary P., Stoner, Joseph S., and Hatfield, Robert G.
Abstract:: Boreal summer insolation during the last interglaciation (LIG) generally warmed the subpolar to polar Northern Hemisphere more than during the early Holocene, yet regional climate variations between the two periods remain. We investigate northeast Labrador Sea subsurface temperature and hydrography across terminations (T) I and II and during the LIG...
Resource Type:: Article
Full Text:: Gary P. Klinkhammer, Joseph S. Stoner, and Robert G. Hatfield College of Earth, Ocean, and Atmospheric

Antarctic icebergs: A significant natural ocean sound source in the Southern Hemisphere

Creator:: Matsumoto, Haru, Bohnenstiehl, DelWayne R., Tournadre, Jean, Dziak, Robert P., Haxel, Joseph H., Lau, T. -K. A., Fowler, Matt, and Salo, Sigrid A.
Abstract:: In late 2007, two massive icebergs, C19a and B15a, drifted into open water and slowly disintegrated in the southernmost Pacific Ocean. Archived acoustic records show that the high-intensity underwater sounds accompanying this breakup increased ocean noise levels at mid-to-equatorial latitudes over a period of ~1.5 years. More typically, seasonal variations...
Resource Type:: Article
Full Text:: Tournadre4, Robert P. Dziak1,2, Joseph H. Haxel1,2, T.-K. A. Lau1,2, Matt Fowler1,2, and Sigrid A. Salo2

ScholarsArchive@OSU

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

Hydrogeological responses to incoming materials at the erosional subduction margin, offshore Osa Peninsula, Costa Rica

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

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

Thermal regime of the Costa Rican convergent margin: 1. Along‐strike variations in heat flow from probe measurements and estimated from bottom‐simulating reflectors

Heat flow along the NanTroSEIZE transect: Results from IODP Expeditions 315 and 316 offshore the Kii Peninsula, Japan

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

Evolution of the northeast Labrador Sea during the last interglaciation

Antarctic icebergs: A significant natural ocean sound source in the Southern Hemisphere

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