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Hydrothermal activity on the ultra-slow spreading southern Knipovich Ridge

Hydrothermal activity on the ultra-slow spreading southern Knipovich Ridge
Hydrothermal activity on the ultra-slow spreading southern Knipovich Ridge
We report first evidence for hydrothermal activity from the southern Knipovich Ridge, an ultra-slow spreading ridge segment in the Norwegian-Greenland Sea. Evidence comes from optical backscatter anomalies collected during a systematic side-scan sonar survey of the ridge axis, augmented by the identification of biogeochemical tracers in the overlying water column that are diagnostic of hydrothermal plume discharge (Mn, CH4, ATP). Analysis of coregistered geologic and oceanographic data reveals that the signals we have identified are consistent with a single high-temperature hydrothermal source, located distant from any of the axial volcanic centers that define second-order segmentation along this oblique ridge system. Rather, our data indicate a hydrothermal source associated with highly tectonized seafloor that may be indicative of serpentinizing ultramafic outcrops. Consistent with this hypothesis, the hydrothermal plume signals we have detected exhibit a high methane to manganese ratio of 2–3:1. This is higher than that typical of volcanically hosted vent sites and provides further evidence that the source of the plume signals reported here is most probably a high-temperature hydrothermal field that experiences some ultramafic influence (compare to Rainbow and Logachev sites, Mid-Atlantic Ridge). While such sites have previously been invoked to be common on the SW Indian Ridge, this may be the first such site to be located along the Arctic ultra-slow spreading ridge system.
hydrothermal, Arctic, serpentinization, Knipovich Ridge
1525-2027
Q08013
Connelly, D.P.
d49131bb-af38-4768-9953-7ae0b43e33c8
German, C.R.
cd0eedd5-1377-4182-9c8a-b06aef8c1069
Asada, M.
f40d8edd-9e78-46c9-ab85-4f496b4c70f8
Okino, K.
97487eb4-7255-4bfe-8f97-ca0f2df46d67
Egorov, A.
78f29f27-4701-4b4e-996d-7ea3079a3736
Naganuma, T.
edb3e366-9928-4a9c-9118-d4fa5a2f222a
Pimenov, N.
bf17f067-ef9d-4163-8957-6e6b9f57c76a
Cherkashev, G.
4dbe4399-dd20-49b1-a31d-1c24d2bd4d88
Tamaki, K.
430153c9-45cc-4ead-a3c4-0a75a4f01c13
Connelly, D.P.
d49131bb-af38-4768-9953-7ae0b43e33c8
German, C.R.
cd0eedd5-1377-4182-9c8a-b06aef8c1069
Asada, M.
f40d8edd-9e78-46c9-ab85-4f496b4c70f8
Okino, K.
97487eb4-7255-4bfe-8f97-ca0f2df46d67
Egorov, A.
78f29f27-4701-4b4e-996d-7ea3079a3736
Naganuma, T.
edb3e366-9928-4a9c-9118-d4fa5a2f222a
Pimenov, N.
bf17f067-ef9d-4163-8957-6e6b9f57c76a
Cherkashev, G.
4dbe4399-dd20-49b1-a31d-1c24d2bd4d88
Tamaki, K.
430153c9-45cc-4ead-a3c4-0a75a4f01c13

Connelly, D.P., German, C.R., Asada, M., Okino, K., Egorov, A., Naganuma, T., Pimenov, N., Cherkashev, G. and Tamaki, K. (2007) Hydrothermal activity on the ultra-slow spreading southern Knipovich Ridge. Geochemistry, Geophysics, Geosystems, 8, Q08013. (doi:10.1029/2007GC001652).

Record type: Article

Abstract

We report first evidence for hydrothermal activity from the southern Knipovich Ridge, an ultra-slow spreading ridge segment in the Norwegian-Greenland Sea. Evidence comes from optical backscatter anomalies collected during a systematic side-scan sonar survey of the ridge axis, augmented by the identification of biogeochemical tracers in the overlying water column that are diagnostic of hydrothermal plume discharge (Mn, CH4, ATP). Analysis of coregistered geologic and oceanographic data reveals that the signals we have identified are consistent with a single high-temperature hydrothermal source, located distant from any of the axial volcanic centers that define second-order segmentation along this oblique ridge system. Rather, our data indicate a hydrothermal source associated with highly tectonized seafloor that may be indicative of serpentinizing ultramafic outcrops. Consistent with this hypothesis, the hydrothermal plume signals we have detected exhibit a high methane to manganese ratio of 2–3:1. This is higher than that typical of volcanically hosted vent sites and provides further evidence that the source of the plume signals reported here is most probably a high-temperature hydrothermal field that experiences some ultramafic influence (compare to Rainbow and Logachev sites, Mid-Atlantic Ridge). While such sites have previously been invoked to be common on the SW Indian Ridge, this may be the first such site to be located along the Arctic ultra-slow spreading ridge system.

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More information

Published date: August 2007
Keywords: hydrothermal, Arctic, serpentinization, Knipovich Ridge

Identifiers

Local EPrints ID: 49678
URI: https://eprints.soton.ac.uk/id/eprint/49678
ISSN: 1525-2027
PURE UUID: afae3695-b929-4a61-aefd-581e2837af4d

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Date deposited: 21 Nov 2007
Last modified: 13 Mar 2019 20:53

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Contributors

Author: D.P. Connelly
Author: C.R. German
Author: M. Asada
Author: K. Okino
Author: A. Egorov
Author: T. Naganuma
Author: N. Pimenov
Author: G. Cherkashev
Author: K. Tamaki

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