Index Catalog // ScholarsArchive@OSU

Geochemical observations on Hydrate Ridge, Cascadia Margin : July 1999

Creator:: Torres, Marta E., Bohrmann, Gerhard, Brown, Kevin, deAngelis, Marie, Hammond, Douglas, Klinkhammer, Gary, McManus, James, Suess, Erwin, and Trehu, Anne
Abstract:: Geophysical and biogeochemical processes associated with fluid venting from active and passive continental margins will receive significant scientific and economic attention into the next century and are of major societal relevance. An important unknown among these interrelated processes is the role played by methane gas hydrates, at and below the...
Resource Type:: Technical Report
Full Text:: subduction zone" (funded by German BMBF by Sues s, Link, Bohrmann and Mienert. GEOMAR) "Geochemistry of

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:: associated with this large organic carbon point-sources is part of ongoing biological studies by Craig Smith

Influence of total organic carbon deposition on the inventory of gas hydrate in the Indian continental margins

Creator:: Johnson, Joel E., Phillips, Stephen C., Torres, Marta E., Piñero, Elena, Rose, Kelly K., and Giosan, L.
Abstract:: Total organic carbon (TOC) content of marine sediments represents residual carbon, originally derived from terrestrial and marine sources, which has survived seafloor and shallow subseafloor diagenesis. Ultimately, its preservation below the sulfate reduction zone in marine sediments drives methanogenesis. Within the gas hydrate stability zone (GHSZ), methane production along continental...
Resource Type:: Article
Full Text:: Influence of total organic carbon

The effect of diagenesis and fluid migration on rare earth element distribution in pore fluids of the northern Cascadia accretionary margin

Creator:: Kim, Ji-Hoon, Torres, Marta E., Haley, Brian A., Kastner, Miriam, Pohlman, John W., Riedel, Michael, and Lee, Young-Joo
Abstract:: Analytical challenges in obtaining high quality measurements of rare earth elements (REEs) from small pore fluid volumes have limited the application of REEs as deep fluid geochemical tracers. Using a recently developed analytical technique, we analyzed REEs from pore fluids collected from Sites U1325 and U1329, drilled on the northern...
Resource Type:: Article
Full Text:: elements Pore water Organic matter Fluid migration Cascadia margin Analytical challenges in obtaining high

HongWeiLiCEOASTowardsQuantifyingTheReaction.pdf

Creator:: Hong, Wei-Li, Torres, Marta E., Kim, Ji-Hoon, Choi, Jiyoung, and Bahk, Jang-Jun
Abstract:: We present a kinetic model based upon pore water data collected from eight sites drilled during the second Ulleung Basin gas hydrate drilling expedition (UBGH2) in 2010. Three sites were drilled at locations where acoustic chimneys were identified in seismic data, and the rest were drilled on non-chimney (i.e. background)...
Full Text:: of gases at acoustic 654 chimneys and background sites in the Ulleung Basin. Organic Geochemistry

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:: with methane seeps in Cumberland Bay, South Georgia’s largest fjord sys- tem. The average organic

Carbon cycling within the sulfate-methane-transition-zone in marine sediments from the Ulleung Basin

Creator:: Hong, Wei-Li, Torres, Marta E., Kim, Ji-Hoon, Choi, Jiyoung, and Bahk, Jang-Jun
Abstract:: The significance of the various carbon cycling pathways in driving the sharp sulfate methane transition (SMTZ) observed at many locations on continental margins is still a topic of debate. Unraveling these processes is important to our understanding of the carbon cycle in general and to evaluate whether the location of...
Resource Type:: Article
Full Text:: comparable rate of organic matter degradation becomes necessary, 42 which in turn consumes a significant

Geochemical evidence for gas hydrate in sediment near the Chile Triple Juction

Creator:: Froelich, Philip N., Kvenvolden, Keith A., Torres, Marta E., Waseda, Amane, Didyk, Borys M., and Lorenson, Thomas D.
Abstract:: Coring at ODP Sites 859, 860, and 861 near the Chile Triple Junction failed to recover anticipated gas hydrate that was inferred to be present from two lines of geophysical evidence: pre-cruise observation of a weak to strong bottom simulating reflector (BSR) marking the predicted base of the gas-hydrate stability...
Resource Type:: Article
Full Text:: Notes: ND = not detected. Measurements from the Marine Organic Geochemistry Laboratory of the U.S.G.S

Is methane venting at the seafloor recorded by δ13C of benthic foraminifera shells?

Creator:: Torres, Marta E., Mix, Alan C., Kinports, K., Haley, Brian A., Klinkhammer, Gary P., McManus, James, and de Angelis, M. A.
Abstract:: The isotopic composition of the dissolved inorganic carbon (DIC) collected at sites of active methane discharge on Hydrate Ridge, Oregon, reveals anaerobic methane oxidation mediated by bacteria, with δ13CDIC reaching values as low as –48‰ in the upper 4 cm of the sediment. In spite of the high sulfide levels...
Resource Type:: Article
Full Text:: nonventing pelagic sediments, and are within the range expected from local organic matter decomposition (0 to

Anomalous porosity preservation and preferential accumulation of gas hydrate in the Andaman accretionary wedge, NGHP-01 site 17A

Creator:: Rose, Kelly K., Johnson, Joel E., Torres, Marta E., Hong, Wei-Li, Giosan, Liviu, Solomon, Evan A., Kastner, Miriam, Cawthern, Thomas, Long, Philip E., and Schaef, H. Todd
Abstract:: In addition to well established properties that control the presence or absence of the hydrate stability zone, such as pressure, temperature, and salinity, additional parameters appear to influence the concentration of gas hydrate in host sediments. The stratigraphic record at Site 17A in the Andaman Sea, eastern Indian Ocean, illustrates...
Resource Type:: Article
Full Text:: et al., 2008). Organic geochemistry and pressure-core related datasets document the presence and

ScholarsArchive@OSU

Geochemical observations on Hydrate Ridge, Cascadia Margin : July 1999

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

Influence of total organic carbon deposition on the inventory of gas hydrate in the Indian continental margins

The effect of diagenesis and fluid migration on rare earth element distribution in pore fluids of the northern Cascadia accretionary margin

HongWeiLiCEOASTowardsQuantifyingTheReaction.pdf

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

Carbon cycling within the sulfate-methane-transition-zone in marine sediments from the Ulleung Basin

Geochemical evidence for gas hydrate in sediment near the Chile Triple Juction

Is methane venting at the seafloor recorded by δ13C of benthic foraminifera shells?

Anomalous porosity preservation and preferential accumulation of gas hydrate in the Andaman accretionary wedge, NGHP-01 site 17A

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