Iodp Expedition 311: Cascadia Margin Gas Hydrates Site U1329 Summary
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چکیده
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) mbsf. At this eastern end-member site of gas hydrate evolution in the acretionary prism, the objectives include (a) characterizing the distribution of gas hydrate, (b) defining the nature of the BSR, (c) developing baseline geochemical and microbiological profiles, and (d) obtaining data needed to ground-truth remotely acquired imaging techniques such as seismic and controlled-source EM.
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Iodp Expedition 311: Cascadia Margin Gas Hydrates Site U1327 Summary
Site U1327 (Scientific Prospectus Site CAS-01B) is located near ODP Site 889/890 approximately at the mid-slope of the accretionary prism over a clearly defined BSR, estimated to be at a depth of 223 mbsf. The primary research objectives for this site are linked to the transect-concept of this expedition. Site 889/890 has provided critical baseline data for the development of the objectives of ...
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