Anatomy of a fluid pipe in the Norway Basin: Initiation, propagation, and 3D shape

Gay, A., Mourgues, R., Berndt, Christian, Bureau, D., Planke, S., Laurent, D., Gautier, S., Lauer, C. and Loggia, D. (2012) Anatomy of a fluid pipe in the Norway Basin: Initiation, propagation, and 3D shape Marine Geology, 332/334 . pp. 75-88. DOI 10.1016/j.margeo.2012.08.010.

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Abstract

An exploration 3D seismic data set from the Gjallar Ridge off mid-Norway images a giant fluid seep structure, 3 × 5 km wide, which connects to late Palaeocene magmatic sills at depth. Two of the pipes that have developed as hydrothermal vents reach all the way to the modern seafloor implying that they either were active much longer than the original hydrothermal activity or have been reactivated. We combine detailed seismic analysis of the northern pipe and sandbox modeling to constrain pipe initiation and propagation. Although both the seismic data and the sandbox models suggest that fluids at depth are focused through a vertical conduit, sandbox models show that fluids ascend and reach a critical depth migration where focused migration abruptly transforms into distributed fluid flow through unconsolidated sediments. This indicates that at this level the sediments are intensely deformed during pipe propagation, creating a V-shaped structure, i.e. an inverted cone at depth and a positive relief anomaly, 5 to 10 m high, at the seafloor, which is clearly identified on 3D seismic data. Comparison of the geometries observed in sandbox modeling with the seismically observed geometries of the Giant Gjallar Vent suggests that the Giant Gjallar Vent may be a proto-fluid seep at an early stage of its development, preceding the future collapse of the structure forming a seafloor depression. Our results imply that the Gjallar Giant Vent can be used as a window into the geological processes active in the deep parts of the Vøring Basin.
Highlights:
► We imaged a 3 × 5-km giant fluid seep structure, the Giant Gjallar Vent, off mid-Norway. ► We combined neural network analysis and sandbox modeling. ► We define the internal geometries of the underlying pipe. ► The Giant Gjallar Vent may be a proto-fluid seep at an early stage of its development.

Document Type: Article
Additional Information: WOS:000313025600006
Keywords: fluid migration; seismic chimney; pipe; focused fluid flow; MID-NORWEGIAN MARGIN; LOWER CONGO BASIN; HYDROTHERMAL VENT COMPLEXES; POLYGONAL FAULT SYSTEMS; OUTER MORAY FIRTH; UK NORTH-SEA; SEISMIC DATA; SEDIMENTARY BASINS; VORING BASIN; CONTINENTAL-MARGIN
Research affiliation: OceanRep > GEOMAR > FB4 Dynamics of the Ocean Floor > FB4-GDY Marine Geodynamics
Refereed: Yes
DOI etc.: 10.1016/j.margeo.2012.08.010
ISSN: 0025-3227
Projects: Action Marges
Date Deposited: 23 Oct 2012 09:40
Last Modified: 03 Aug 2017 13:20
URI: http://eprints.uni-kiel.de/id/eprint/16505

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