Index Catalog // ScholarsArchive@OSU

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:: seafloor D. G. Pyle and D. M. Christie College of Oceanic and Atmospheric Sciences, Oregon State

Observations of nearshore crescentic sandbars

Creator:: van Enckevort, I. M. J., Ruessink, B. G., Coco, Giovanni, Suzuki, K., Turner, I. L., Plant, Nathaniel G., and Holman, Robert A.
Abstract:: The temporal and spatial variability of crescentic sandbars is analyzed with hourly long-term (months) video observations collected at four barred sites and are qualitatively compared to the temporal and spatial variability predicted by hypotheses underpinning existing approaches and models for crescentic bar formation (edge-wave template model, linear stability analysis, and...
Resource Type:: Article
Full Text:: I. M. J. van Enckevort,1 B. G. Ruessink,1 Giovanni Coco,2,3 K. Suzuki,4 I. L. Turner,5 N. G. Plant

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:: ,1 Robert A. Duncan,1 and Nicklas G. Pisias1 Received 23 May 2006; accepted 8 September 2006

A comparison of techniques for magnetotelluric response function estimation

Creator:: Jones, Alan G., Chave, Alan D., Egbert, Gary D., Auld, Don, and Bahr, Karsten
Abstract:: Spectral analysis of the time-varying horizontal magnetic and electric field components yields the magnetotelluric (MT) impedance tensor. This frequency dependent 2x2 complex tensor can be examined for details which axe diagnostic of the electrical conductivity distribution in the Earth within the relevant (frequency dependent) inductive scale length of the surface...
Resource Type:: Article
Full Text:: , 1989 A Comparison of Techniques for Magnetotelluric Response Function Estimation ALAN G. JONES, 1

Magnetotelluric observations across the Juan de Fuca subduction system in the EMSLAB project

Creator:: Wannamaker, Philip E., Booker, John R., Filloux, Jean H., Jones, Alan G., Jiracek, George R., Chave, Alan D., Tarits, Pascal, Waff, Harve S., Egbert, Gary D., Young, Charles T., Stodt, John A., Martinez, Mario G., Law, Lawrie K., Yukutake, Takesi, Segawa, Jiro S., White, Anthony, and Green, A.W.
Abstract:: A magnetotelluric (MT)transect has been obtained near latitude 45øN from the active Juan de Fuca Spreading center, across the subduction zone and Cascades volcanic arc, and into the back arc Deschutes Basin region. This paper presents the MT data set and describes its major characteristics as they pertain to the...
Resource Type:: Article
Full Text:: , MARIO MARTINEZ G.,LAWRIE K. LAW, TAKESI YUKUTAKE, JIRO S. SEGAWA, ANTHONY WI-R'IE, AND A. W. GREEN, JR

Introduction to special section on Recent Advances in the Study of Optical Variability in the Near-Surface and Upper Ocean

Creator:: Dickey, T., Banner, M. L., Bhandari, P., Boyd, Timothy John, 1958-2013, Carvalho, L., Chang, G., Chao, Y., Czerski, H., Darecki, M., Dong, C., Farmer, D., Freeman, S., Gemmrich, J., Gernez, P., Hall-Patch, N., Holt, B., Jiang, S., Jones, C., Kattawar, G., LeBel, D., Lenain, L., Lewis, M., Liu, Y., Logan, L., Manov, D., Melville, W. K., Moline, M. A., Morison, R., Nencioli, F., Pegau, W. S., Reineman, B., Robbins, I., Roettgers, R., Schultz, H., Shen, L., Shinki, M., Slivkoff, M., Sokolski, M., Spada, F., Statom, N., Stramski, D., Sutherland, P., Twardowski, M., Vagle, S., Van Dommelen, R., Voss, K., Washburn, L., Wei, J., Wijesekera, H., Wurl, O., Yang, D., Yildiz, S., You, Y., Yue, D. K. P., Zaneveld, R., and Zappa, C. J.
Abstract:: Optical variability occurs in the near-surface and upper ocean on very short time and space scales (e.g., milliseconds and millimeters and less) as well as greater scales. This variability is caused by solar, meteorological, and other physical forcing as well as biological and chemical processes that affect optical properties and...
Resource Type:: Article
Full Text:: . Banner,2,3 P. Bhandari,4 T. Boyd,5,6 L. Carvalho,7 G. Chang,8 Y. Chao,9 H. Czerski,10 M. Darecki,11 C

Nicoya Peninsula, Costa Rica: A single suite of Caribbean oceanic plateau magmas

Creator:: Sinton, Christopher W., Duncan, Robert A., and Denyer, Percy
Abstract:: The pre-Tertiary oceanic crust exposed on the west coast of Costa Pica has been broadly referred to as the Nicoya Complex. This study was designed to determine the age of the Nicoya Complex in the Nicoya Peninsula, Playa Jaco, and the Quepos Peninsula using Ar-40-Ar-39 radiometric dating and to assess...
Resource Type:: Article
Full Text:: focused on mid-ocean ridge environments [e.g., Klein and Langmuir , 1987; Johnson et al. , 1990] and not

Near‐surface dynamics of a separated jet in the coastal transition zone off Oregon

Creator:: Koch, A. O., Kurapov, A. L., and Allen, J. S.
Abstract:: Three‐dimensional circulation in the coastal transition zone (CTZ) off Oregon is studied using a 3 km resolution model based on the Regional Ocean Modeling System. The study period is spring and summer 2002, when extensive observations were available from the northeastern Pacific component of the Global Ocean Ecosystems Dynamics project....
Resource Type:: Article
Full Text:: Figure 15 corresponding across‐jet vertical sections of buoyancy fre- quency N2 = −(g/r0)(∂s�/∂z

Petrology and Geochemistry of the Galápagos Islands : portrait of a pathological mantle plume

Creator:: White, William M., McBirney, Alexander R., and Duncan, Robert A.
Abstract:: We report new major element, trace element, isotope ratio, and geochronological data on the Galapagos Archipelago. Magmas erupted from the large western volcanos are generally moderately fractionated tholeiites of uniform composition; those erupted on other islands are compositionally diverse, ranging from tholeiites to picritic basanitoids. While these volcanoes do not...
Resource Type:: Article
Full Text:: atomic absorption spectrophotometry. Approximately 5 g of the crushed rock was loaded into a Mo-crucible

Observations of tidal variability on the New England shelf

Creator:: Shearman, R. Kipp and Lentz, Steven J.
Abstract:: Observations from the Coastal Mixing and Optics experiment moored array, deployed from August 1996 through June 1997, are used to describe barotropic and baroclinic tidal variability over the New England shelf. The dominant M₂ tidal elevations decrease toward the northeast to a minimum over the Nantucket shoals (about 34 cm),...
Resource Type:: Article
Full Text:: density, g = 9.81 m s�2 is the gravitational acceleration and h is the bottom depth. Vector-measuring

ScholarsArchive@OSU

Geochemistry and geochronology of ancient southeast Indian and southwest Pacific seafloor

Observations of nearshore crescentic sandbars

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

A comparison of techniques for magnetotelluric response function estimation

Magnetotelluric observations across the Juan de Fuca subduction system in the EMSLAB project

Introduction to special section on Recent Advances in the Study of Optical Variability in the Near-Surface and Upper Ocean

Nicoya Peninsula, Costa Rica: A single suite of Caribbean oceanic plateau magmas

Near‐surface dynamics of a separated jet in the coastal transition zone off Oregon

Petrology and Geochemistry of the Galápagos Islands : portrait of a pathological mantle plume

Observations of tidal variability on the New England shelf

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