DOI: 10.1038/ngeo2696
论文题名: Regulation of ice stream flow through subglacial formation of gas hydrates
作者: Winsborrow M. ; Andreassen K. ; Hubbard A. ; Plaza-Faverola A. ; Gudlaugsson E. ; Patton H.
刊名: Nature Geoscience
ISSN: 17520894
出版年: 2016
卷: 9, 期: 5 起始页码: 370
结束页码: 374
语种: 英语
Scopus关键词: flow regulation
; fluid expulsion
; gas hydrate
; glacier flow
; hydrocarbon reservoir
; ice sheet
; ice stream
; paleoenvironment
; subglacial environment
; Arctic Ocean
; Baltic Shield
; Barents Sea
; East European Craton
英文摘要: Variations in the flow of ice streams and outlet glaciers are a primary control on ice sheet stability, yet comprehensive understanding of the key processes operating at the ice-bed interface remains elusive. Basal resistance is critical, especially sticky spots-localized zones of high basal traction-for maintaining force balance in an otherwise well-lubricated/high-slip subglacial environment. Here we consider the influence of subglacial gas-hydrate formation on ice stream dynamics, and its potential to initiate and maintain sticky spots. Geophysical data document the geologic footprint of a major palaeo-ice-stream that drained the Barents Sea-Fennoscandian ice sheet approximately 20,000 years ago. Our results reveal a ∼250 km2 sticky spot that coincided with subsurface shallow gas accumulations, seafloor fluid expulsion and a fault complex associated with deep hydrocarbon reservoirs. We propose that gas migrating from these reservoirs formed hydrates under high-pressure, low-temperature subglacial conditions. The gas hydrate desiccated, stiffened and thereby strengthened the subglacial sediments, promoting high traction-a sticky spot-that regulated ice stream flow. Deep hydrocarbon reservoirs are common beneath past and contemporary glaciated areas, implying that gas-hydrate regulation of subglacial dynamics could be a widespread phenomenon. © 2016 Macmillan Publishers Limited. All rights reserved. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/106010
Appears in Collections: 气候减缓与适应 科学计划与规划
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作者单位: CAGE-Centre for Arctic Gas Hydrate Environment and Climate, Department of Geology, UiT the Arctic University of Norway, Tromsø, Norway
Recommended Citation:
Winsborrow M.,Andreassen K.,Hubbard A.,et al. Regulation of ice stream flow through subglacial formation of gas hydrates[J]. Nature Geoscience,2016-01-01,9(5)