Gas hydrate on the northern Cascadia margin: regional geophysics and structural framework.

Riedel, Michael , Willoughby, E. C., Chen, M. A., He, T., Novosel, I., Schwalenberg, K., Hyndman, R. D., Spence, G. D., Chapman, N. R. and Edwards, R. N. (2006) Gas hydrate on the northern Cascadia margin: regional geophysics and structural framework. Proceedings of the Integrated Ocean Drilling Program, 311 . DOI 10.2204/iodp.proc.311.109.2006.

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Abstract

Integrated Ocean Drilling Program Expedition 311 is based on ex-
tensive site survey data and historic research at the northern Cas-
cadia margin since 1985. This research includes various regional
geophysical surveys using a broad spectrum of seismic tech-
niques, coring and logging by the Ocean Drilling Program Leg
146, heat flow measurements, shallow piston coring, and bottom
video observations across a cold-vent field, as well as novel con-
trolled-source electromagnetic and seafloor compliance surveying
techniques. The wealth of data available allowed construction of
structural cross-sections of the margin, development of models
for the formation of gas hydrate in an accretionary prism, and es-
timation of gas hydrate and free gas concentrations. Expedition
311 established for the first time a transect of drill sites across the
northern Cascadia margin to study the evolution of gas hydrate
formation over the entire gas hydrate stability field of the accre-
tionary complex. This paper reviews the tectonic framework at
the northern Cascadia margin and summarizes the scientific stud-
ies that led to the drilling objectives of Expedition 311 Cascadia
gas hydrate.

Document Type: Article
Keywords: Gas hydrate; northern Cascadia margin; IODP Exp.311
Refereed: Yes
Open Access Journal?: Yes
DOI etc.: 10.2204/iodp.proc.311.109.2006
ISSN: 1930-1014
Projects: IODP
Date Deposited: 25 Nov 2015 13:17
Last Modified: 25 Nov 2015 13:24
URI: http://oceanrep.geomar.de/id/eprint/30162

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