Index Catalog // ScholarsArchive@OSU

Creator:: Tréhu, Anne Martine, Lin, Guibiao, Maxwell, Edward, and Goldfinger, Chris
Abstract:: In 1989, we conducted an onshore/offshore seismic experiment to image the crustal structure of the Cascadia forearc. In this paper, we discuss the processing and interpretation of a multichannel seismic reflection profile across the continental margin that was collected as part of this effort. This profile reveals several features of...
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Full Text:: of 0.051 øK/m (as measured during leg 146 and reported by ODP Leg 146 Scientific Party [1993]) and

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...
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Full Text:: no magnetic anomalies are apparent, age estimates are those of the DSDP Leg Scientific Party

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...
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Full Text:: . Acknowledgments. We thank R. Hey for providing us with the bathymetry and gravity data collected during Leg 5 of

Creator:: Tréhu, Anne Martine, Stakes, Debra S., Bartlett, Cindy D., Chevallier, Johanna, Duncan, Robert A., Goffredi, Shana K., Potter, Susan M., and Salamy, Karen A.
Abstract:: Seismic data and seafloor samples indicate the presence of free gas, gas hydrate, and fluid seeps south of the Gorda Escarpment, a topographic feature that marks the eastern end of the Gorda/Pacific transform plate boundary southwest of Cape Mendocino, California. In spite of high sedimentation rates and high biological productivity,...
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Full Text:: of the California current [Leg 167 Shipboard Scientific Party, 1997a]. The lithologic summary for

Creator:: Scheirer, Daniel S., Forsyth, Donald W., Conder, James A., Eberle, MichaelA., Hung, Shu-Huei, Johnson, Kevin, and Graham, David W.
Abstract:: The Amsterdam-St. Paul Plateau is bisected by the intermediate-rate spreading Southeast Indian Ridge, and numerous geophysical and tectonic anomalies arise from the interactions of the Amsterdam-St. Paul hotspot and the spreading center. The plate boundary geometry on the hotspot platform evolves rapidly (on timescales <1 Myr), off-axis volcanism is abundant,...
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Full Text:: contoured every I km; thick line indicates the cruise track from Boomerang, Leg 6; shaded box indicates

Creator:: Wright, Dawn J., Haymon, Rachel M., and Fornari, Daniel J.
Abstract:: The deep-towed Argo I optical/acoustical vehicle and a geographic information system (GIS) have been used to establish the abundance, widths, and spatial distribution of fissures, as well as the relative age distribution of lavas along the narrow (<500 m wide) axial zone of the East Pacific Rise (EPR) from 9°12′...
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Full Text:: , 1990]. This allowed the scientific party at sea to immediately archive four different types of

Creator:: Goldfinger, Chris, Kulm, LaVerne D., Yeats, Robert S., McNeill, Lisa, and Hummon, Cheryl
Abstract:: At least nine WNW trending left-lateral strike-slip faults have been mapped on the Oregon-Washington continental margin using sidescan sonar, seismic reflection, and bathymetric data, augmented by submersible observations. The faults range in length from 33 to 115 km and cross much of the continental slop. Five faults offset both the...
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Full Text:: Program (ODP) drilling and reflection data [Hyndman and Davis, 1992; Shipboard Scientific Party, 1994

Creator:: Desonie, Dana L. and Duncan, Robert A.
Abstract:: Cobb hotspot, currently located beneath Axial seamount on the Juan de Fuca ridge, has the temporal but not the isotopic characteristics usually attributed to a mantle plume. The earlier volcanic products of the hotspot, from eight volcanoes in the Cobb-Eickelberg seamount (CES) chain, show a westward age progression away from...
Resource Type:: Article

Creator:: Fretzdorff, Susanne, Worthington, Tim J., Haase, Karsten M., Hekinian, Roger, Franz, Leander, Keller, Randall A., and Stoffers, Peter
Abstract:: Bransfield Basin is an actively extending marginal basin separating the inactive South Shetland arc from the northern Antarctic Peninsula. Rift-related volcanism is widespread throughout the central Bransfield Basin, but the wider eastern Bransfield Basin was previously unsampled. Lavas recovered from the eastern subbasin form three distinct groups: (1) Bransfield Group...
Resource Type:: Article
Full Text:: and Party of SO-155, 2001]. Geochemical and isotopic analyses of these lavas allow us to examine

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