期刊
MARINE GEOLOGY
卷 435, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.margeo.2021.106453
关键词
Submarine slope failures; Continental margin morphology; Cold venting process and products; Arctic Ocean; Autonomous Underwater Vehicles
资金
- David and Lucile Packard Foundation
- Canadian Program of Energy Research and Development (PERD)
- Ministry of Ocean and Fisheries, Korea (KIMST) [20160247]
Exploration of the continental slope of the Canadian Beaufort Sea has revealed a coalescence of slide scars, indicating retrograde failures as a possible cause, while also suggesting that fluid venting and overpressure may play a role in the development of extensive slope failures seen along this margin. The impact of pore water salinity changes at the depth of the failure plane on slope stability has not been considered in marine settings previously.
Exploration of the continental slope of the Canadian Beaufort Sea has revealed a remarkable coalescence of slide scars with headwalls between 130 and 1100 m water depth (mwd). With increased depth, the scars widen and merge into one gigantic regional slide scar that is more than 100 km wide below similar to 1100 mwd. To understand the development of these features, five sites were investigated with an Autonomous Underwater Vehicle, which provided 1-m bathymetric grids and Chirp profiles, and surveyed with a Remotely Operated Vehicle. The morphologies are consistent with retrograde failures that occurred on failure planes located between 30 and 75 m below the modern seafloor. At issue is whether the continental slope in this area is preconditioned for failure. While rapid sedimentation during glacial periods, and the presence of shallow gas cannot be ruled out, given the geological environment, it is unclear that they are primary preconditioning factors. Evidence of widespread flushing of the slope with brackish waters, and observed flows of brackish water within slide scars, suggest fluid venting and overpressure may play a role in the development of the extensive slope failures seen along this margin. The impact of pore water salinity changes at the depth of the failure plane on slope stability has not been considered in marine settings previously.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据