Index Catalog // ScholarsArchive@OSU

Leg 204 synthesis : gas hydrate distribution and dynamics in the Central Cascadia accretionary complex

Creator:: Tréhu, Anne Martine, Torres, Marta E., Bohrmann, G., and Colwell, Frederick
Abstract:: Ocean Drilling Program (ODP) Leg 204 to Hydrate Ridge, located on the continental slope offshore Oregon (USA), was the first drilling expedition dedicated to understanding gas hydrate processes in accretionary complexes and provided a testbed for a number of different techniques for estimating the gas hydrate content of sediments. It...
Resource Type:: Article
Full Text:: DYNAMICS IN THE CENTRAL CASCADIA ACCRETIONARY COMPLEX Tréhu, A.M., Bohrmann, G., Torres, M.E., and

Feeding methane vents and gas hydrate deposits at south Hydrate Ridge

Creator:: Tréhu, Anne Martine, Flemings, Peter B., Bangs, Nathan Lawrence Bailey, Chevallier, Johanna, Gracia, Eulalia, Johnson, Joel E., Liu, C. S., Liu, Xiaoli, Riedel, Michael, and Torres, Marta E.
Abstract:: Log and core data document gas saturations as high as 90% in a coarse-grained turbidite sequence beneath the gas hydrate stability zone (GHSZ) at south Hydrate Ridge, in the Cascadia accretionary complex. The geometry of this gas-saturated bed is defined by a strong, negative-polarity reflection in 3D seismic data. Because...
Resource Type:: Article
Full Text:: Hydrate Ridge, OR, I: Hydrological provinces, Earth Planet. Sci. Lett., 201, 525–540. Torres, M. E., K

Relationship of pore water freshening to accretionary processes in the Cascadia margin: Fluid sources and gas hydrate abundance

Creator:: Torres, Marta E., Teichert, B. M. A., Tréhu, Anne Martine, Borowski, W., and Tomaru, H.
Abstract:: Drilling in the Cascadia accretionary complex enable us to evaluate the contribution of dehydration reactions and gas hydrate dissociation to pore water freshening. The observed freshening with depth and distance from the prism toe is consistent with enhanced conversion of smectite to illite, driven by increase in temperature and age...
Resource Type:: Article
Full Text:: accretionary processes in the Cascadia margin: Fluid sources and gas hydrate abundance M. E. Torres,1 B. M. A

Data report : composition of clay minerals from hemiplegic sediments at Hydrate Ridge, Cascadia subduction zone

Creator:: Underwood, Michael and Torres, Marta E.
Abstract:: This report describes the results of semiquantitative analysis of clay mineral composition by X-ray diffraction. The samples consist of hemipelagic mud and mudstone cored from Hydrate Ridge during Leg 204 of the Ocean Drilling Program. We analyzed oriented aggregates of the clay-sized fractions (<2 μm) to estimate relative percentages of...
Resource Type:: Article
Full Text:: HEMIPELAGIC SEDIMENTS AT HYDRATE RIDGE, CASCADIA SUBDUCTION ZONE Tréhu, A.M., Bohrmann, G., Torres, M.E

Mapping, geochemical sampling and submersible observations of recent activity on the San Clemente fault zone : 27 March to 4 April 2000

Creator:: McManus, James, Goldfinger, Chris, and Torres, Marta E.
Abstract:: The investigation described in this project will test the hypothesis that fluxes of carbon, barium, manganese, iron and uranium associated with fluid seepage at the San Clemente fracture zone significantly affect the geochemical budgets for these elements, and ultimately result in anomalously high benthic fluxes throughout the San Clemente basin.
Resource Type:: Technical Report
Full Text:: observations of recent activity on the San Clemente fault zone 27 March to 4 April 2000. Marta E. Torres

Stable isotopes (¹⁸O/¹⁶O) and ⁸⁷Sr/⁸⁶Sr ratios in pore fluids of the Chile Triple Junction accretionary prism : implications for diagenesis and fluid migration

Creator:: Zheng, Yan, Froelich, Philip N., Torres, Marta E., and Dia, Aline N.
Abstract:: Oxygen and strontium isotopic composition of sedimentary pore fluids obtained by drilling at the Chile Triple Junction have been used to obtain information on the diagenesis and transport mechanisms of fluids. Samples were collected from three sites located on an east-west transect of the pre-collision zone (Sites 859, 860, and...
Resource Type:: Article
Full Text:: . FROELICH, M.E. TORRES, A.N. DIA - 4 - 2r 5 7 5 6 0 0 6 2 5 6 5 0 Cl ( m M ) ^ 1 ' ' ' ' I 4 0 0 4 5 0

Geological and geochemical contraints on the isotopic composition of interstitial waters from the Hydrate Ridge region, Cascadia Continental margin

Creator:: Tomaru, A. M., Matsumoto, R., Torres, Marta E., and Borowski, Walter S.
Abstract:: The isotopic compositions of interstitial waters collected from Hydrate Ridge during Ocean Drilling Program Leg 204 were measured to evaluate the fluid evolution of this accretionary prism. At shallow depths, the dissolved Cl- concentrations and δD and δ¹⁸O values of the interstitial water reflect changes in the salinity and the...
Resource Type:: Article
Full Text:: Tréhu, A.M., Bohrmann, G., Torres, M.E., and Colwell, F.S. (Eds.) Proceedings of the Ocean Drilling

Elemental and isotopic abundance of noble gases in formation fluids recovered in situ from the Chile Triple Juction

Creator:: Torres, Marta E., Bayer, Reinhold, Winckler, Gisela, Suckow, Axel, and Froelich, Philip N.
Abstract:: Sedimentary pore fluids from the Chile Triple Junction were sampled in situ, and analyzed for their noble gas composition. ³He/⁴He and ⁴He/Ne ratios were used to evaluate the fraction of helium in the samples that originated from mantle and radiogenic sources. The results show no primordial helium in samples recovered...
Resource Type:: Article
Full Text:: FLUIDS RECOVERED IN SITU FROM THE CHILE TRIPLE JUNCTION1 Marta E. Torres,2 Reinhold Bayer,3 Gisela

Variations in Gas and Water Pulses at an Arctic Seep: Fluid Sources and Methane Transport

Creator:: Hong, Wei-Li, Torres, Marta E., Portnov, A., Waage, M., Haley, B., and Lepland, A.
Abstract:: Methane fluxes into the oceans are largely dependent on the methane phase as it migrates upward through the sediments. Here we document decoupled methane transport by gaseous and aqueous phases in Storfjordrenna (offshore Svalbard) and propose a three-stage evolution model for active seepage in the region where gas hydrates are...
Resource Type:: Article
Full Text:: Set S1 Correspondence to: W.-L. Hong, wei-li.hong@ngu.no Citation: Hong, W.-L., Torres, M. E

Carbon cycling fed by methane seepage at the shallow Cumberland Bay, South Georgia, sub-Antarctic

Creator:: Geprägs, Patrizia, Torres, Marta E., Mau, Susan, Kasten, Sabine, Römer, Miriam, and Bohrmann, Gerhard
Abstract:: Recent studies have suggested that the marine contribution of methane from shallow regions and melting marine-terminating glaciers may have been underestimated. Here we report on methane sources and potential sinks associated with methane seeps in Cumberland Bay, South Georgia's largest fjord system. The average organic carbon content in the upper...
Resource Type:: Article
Full Text:: transition (SMT) Correspondence to: P. Gepr€ags, pgepraegs@marum.de Citation: Gepr€ags, P., M. E. Torres, S

ScholarsArchive@OSU

Leg 204 synthesis : gas hydrate distribution and dynamics in the Central Cascadia accretionary complex

Feeding methane vents and gas hydrate deposits at south Hydrate Ridge

Relationship of pore water freshening to accretionary processes in the Cascadia margin: Fluid sources and gas hydrate abundance

Data report : composition of clay minerals from hemiplegic sediments at Hydrate Ridge, Cascadia subduction zone

Mapping, geochemical sampling and submersible observations of recent activity on the San Clemente fault zone : 27 March to 4 April 2000

Stable isotopes (¹⁸O/¹⁶O) and ⁸⁷Sr/⁸⁶Sr ratios in pore fluids of the Chile Triple Junction accretionary prism : implications for diagenesis and fluid migration

Geological and geochemical contraints on the isotopic composition of interstitial waters from the Hydrate Ridge region, Cascadia Continental margin

Elemental and isotopic abundance of noble gases in formation fluids recovered in situ from the Chile Triple Juction

Variations in Gas and Water Pulses at an Arctic Seep: Fluid Sources and Methane Transport

Carbon cycling fed by methane seepage at the shallow Cumberland Bay, South Georgia, sub-Antarctic

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