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The Håkon Mosby mud volcano: 330 000 years of focused fluid flow activity at the SW Barents Sea slope

The Håkon Mosby mud volcano: 330 000 years of focused fluid flow activity at the SW Barents Sea slope
The Håkon Mosby mud volcano: 330 000 years of focused fluid flow activity at the SW Barents Sea slope
Studying the morphology and subsurface geometry of mud volcanoes provides insights into their activity. This paper describes the internal structure of the Håkon Mosby mud volcano (HMMV) in the southwestern Barents Sea and presents a conceptual model of its evolution. The lack of a mud edifice and the profuse gas flares suggest that in the recent past the mud volcano evolution was predominantly controlled by venting of gas-rich fluids and free gas. However, the analysis of high-resolution single-channel seismic (SCS) data reveals for the first time the existence of a pseudo-mud chamber at the top of the 3 km deep central conduit. It was once created at the seabed and is now a buried expression that acts as mud chamber. The pseudo-mud chamber is situated approximately 300 m below the seafloor, directly above the 330 ka Bear Island Slide (BIS) scar reflection and below glacigenic debris flow deposits that constitute the sediment on top. The sediment profiler data indicates a younger mud deposit above the debris flows, which points to a reactivation of the mud volcano. The reactivation was most likely triggered by the contrast in density between the gas-rich mud chamber and the high-density debris flow deposits. Three stages, i.e. initiation, sealing and reactivation, and a second active period define the evolution of this young mud volcano. Both, the morphology and size of the conduit as well as in-situ temperature gradients point towards a focused and rapid fluid flow.
mud volcano, fluid flow, conduit, Barents Sea, Bear Island Slide
9781402065118
0025-3227
105-115
Perez-Garcia, C.
e2de39b9-85ff-473f-813a-b761e309279c
Feseker, T.
76690932-b6f2-4981-b5cb-1de8ce530867
Mienert, J.
90ba1f28-5249-4663-ad09-b6abc8b46068
Berndt, C.
231544d4-f681-44a2-ae6e-74385e588bf6
Perez-Garcia, C.
e2de39b9-85ff-473f-813a-b761e309279c
Feseker, T.
76690932-b6f2-4981-b5cb-1de8ce530867
Mienert, J.
90ba1f28-5249-4663-ad09-b6abc8b46068
Berndt, C.
231544d4-f681-44a2-ae6e-74385e588bf6

Perez-Garcia, C., Feseker, T., Mienert, J. and Berndt, C. (2009) The Håkon Mosby mud volcano: 330 000 years of focused fluid flow activity at the SW Barents Sea slope. Marine Geology, 262 (1-4), 105-115. (doi:10.1016/j.margeo.2009.03.022).

Record type: Article

Abstract

Studying the morphology and subsurface geometry of mud volcanoes provides insights into their activity. This paper describes the internal structure of the Håkon Mosby mud volcano (HMMV) in the southwestern Barents Sea and presents a conceptual model of its evolution. The lack of a mud edifice and the profuse gas flares suggest that in the recent past the mud volcano evolution was predominantly controlled by venting of gas-rich fluids and free gas. However, the analysis of high-resolution single-channel seismic (SCS) data reveals for the first time the existence of a pseudo-mud chamber at the top of the 3 km deep central conduit. It was once created at the seabed and is now a buried expression that acts as mud chamber. The pseudo-mud chamber is situated approximately 300 m below the seafloor, directly above the 330 ka Bear Island Slide (BIS) scar reflection and below glacigenic debris flow deposits that constitute the sediment on top. The sediment profiler data indicates a younger mud deposit above the debris flows, which points to a reactivation of the mud volcano. The reactivation was most likely triggered by the contrast in density between the gas-rich mud chamber and the high-density debris flow deposits. Three stages, i.e. initiation, sealing and reactivation, and a second active period define the evolution of this young mud volcano. Both, the morphology and size of the conduit as well as in-situ temperature gradients point towards a focused and rapid fluid flow.

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More information

Published date: 1 July 2009
Keywords: mud volcano, fluid flow, conduit, Barents Sea, Bear Island Slide

Identifiers

Local EPrints ID: 66436
URI: http://eprints.soton.ac.uk/id/eprint/66436
ISBN: 9781402065118
ISSN: 0025-3227
PURE UUID: 5bd53618-cded-4a47-b060-5ff5b80ae0c7

Catalogue record

Date deposited: 15 Jun 2009
Last modified: 08 Jan 2022 11:26

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Contributors

Author: C. Perez-Garcia
Author: T. Feseker
Author: J. Mienert
Author: C. Berndt

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