Gas hydrate transect across Northern Cascadia Margin
نویسندگان
چکیده
منابع مشابه
Halogen and I systematics in gas hydrate fields at the northern Cascadia margin (IODP Expedition 311): Insights from numerical modeling
[1] We measured halogen concentrations and I/I ratios in five drilling sites of Integrated Ocean Drilling Program Expedition 311 (offshore Vancouver Island, Canada) in order to identify potential sources of fluids and methane in gas hydrate fields. Iodine is dominated by organic decomposition and transports with fluids in reducing environments and the presence of the cosmogenic radioisotope I (...
متن کاملNorth-south Variability in the History of Deformation and Fluid Venting across Hydrate Ridge, Cascadia Margin
Hydrate Ridge is an accretionary thrust ridge located on the lower slope of the central Cascadia convergent margin. Structural mapping using 2-D and 3-D multichannel seismic reflection profiles and gridded bathymetry coupled with deep towed sidescan sonar data and ODP drilling biostratigraphy, suggest that seafloor fluid venting patterns are likely controlled by the seaward vergent structural s...
متن کاملIntegrated Ocean Drilling Program (IODP) Proposal GAS HYDRATE ON THE CASCADIA MARGIN
This proposal is for an IODP program to constrain models for the formation of deep sea gas hydrate in subduction zone accretionary prisms. The objectives include the deep origin of the methane, its upward transport, its incorporation in gas hydrate, and its subsequent loss to the seafloor. The main attention is on the widespread seafloor-parallel layer of dispersed hydrate located just above th...
متن کاملIodp Expedition 311: Cascadia Margin Gas Hydrates Site U1329 Summary
The objectives of coring and downhole logging at this site are tied to completing the transect of scientific drill sites across the Northern Cascadia Margin to further constrain models for the formation of marine gas hydrate in a subduction zone acretionary prism. The depth to the BSR rapidly becomes shallower around this site and is only half the depth (~125 mbsf) than at Site U1327 (~225) mbs...
متن کاملIodp Expedition 311: Cascadia Margin Gas Hydrates Site U1325 Summary
Site U1325 (Prospectus Site CAS-02C) is located near the southwestern end of the marginperpendicular transect established during Expedition 311 and is within a major slope basin that developed eastward of the deformation front behind a steep ridge of accreted sediments. Bathymetry data show that the seafloor in the western part of this slope basin is relatively flat with water depths around 220...
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ژورنال
عنوان ژورنال: Eos, Transactions American Geophysical Union
سال: 2006
ISSN: 0096-3941
DOI: 10.1029/2006eo330002