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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

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:: . Teichert,2 A. M. Tréhu,1 W. Borowski,3 and H. Tomaru4,5 Received 6 August 2004; revised 13 September 2004

Creator:: Johnson, Joel E., Goldfinger, Chris, Tréhu, Anne M., Bangs, Nathan Lawrence Bailey, Torres, Marta E., and Chevallier, Johanna
Abstract:: Hydrate Ridge is an accretionary thrust ridge located on the lower slope of the central Cascadia convergent margin. Structural mapping based on two-dimensional and three-dimensional multichannel seismic reflection profiles and gridded bathymetry coupled with deep-towed sidescan sonar data and Ocean Drilling Program (ODP) biostratigraphy suggests that seafloor fluid venting patterns...
Resource Type:: Article
Full Text:: , CASCADIA MARGIN1 Joel E. Johnson,2,3 Chris Goldfinger,3 Anne M. Tréhu,3 Nathan L.B. Bangs,4 Marta E

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:: McManus Erwin Suess Anne Trehu Data Report 174 Reference 99-3 College of OCEANIC & ATMOSPHERIC

Creator:: Torres, Marta E., Brown, Kevin, Collier, Robert W., deAngelis, Marie, Hammond, Douglas, McManus, James, Rehder, Gregor, and Trehu, Anne
Abstract:: A massive release of methane on the Cascadia Hydrate Ridge was documented during a ROPOS program in August 1998, consistent with previously reported observations in 1996. An extensive survey of the seafloor revealed that the seeps lie within a narrow band trending 109 degrees. This feature parallels larger mounds imaged...
Resource Type:: Technical Report

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:: south Hydrate Ridge Anne M. Tréhu,1 Peter B. Flemings,2 Nathan L. Bangs,3 Johanna Chevallier,1

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