Fluid composition of the sediment-influenced Loki’s Castle vent field at the ultra-slow spreading Arctic Mid-Ocean Ridge

The hydrothermal vent field Loki’s Castle is located in the Mohns-Knipovich bend (73°N) of the ultraslow spreading Arctic Mid-Ocean Ridge (AMOR) close to the Bear Island sediment fan. The hydrothermal field is venting up to 320° C hot black smoker fluids near the summit of an axial volcanic ridge. E...

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Veröffentlicht in:Geochimica et cosmochimica acta 2016-08, Vol.187, p.156-178
Hauptverfasser: Baumberger, Tamara, Früh-Green, Gretchen L., Thorseth, Ingunn H., Lilley, Marvin D., Hamelin, Cédric, Bernasconi, Stefano M., Okland, Ingeborg E., Pedersen, Rolf B.
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container_start_page 156
container_title Geochimica et cosmochimica acta
container_volume 187
creator Baumberger, Tamara
Früh-Green, Gretchen L.
Thorseth, Ingunn H.
Lilley, Marvin D.
Hamelin, Cédric
Bernasconi, Stefano M.
Okland, Ingeborg E.
Pedersen, Rolf B.
description The hydrothermal vent field Loki’s Castle is located in the Mohns-Knipovich bend (73°N) of the ultraslow spreading Arctic Mid-Ocean Ridge (AMOR) close to the Bear Island sediment fan. The hydrothermal field is venting up to 320° C hot black smoker fluids near the summit of an axial volcanic ridge. Even though the active chimneys have grown on a basaltic ridge, geochemical fluid data show a strong sedimentary influence into the hydrothermal circulation at Loki’s Castle. Compelling evidence for a sediment input is given by high alkalinity, high concentrations of NH4+, H2, CH4, C2+ hydrocarbons as well as low Mn and Fe contents. The low δ13C values of CO2 and CH4 and the thermogenic isotopic pattern of the C2+ hydrocarbons in the high-temperature vent fluids clearly point to thermal degradation of sedimentary organic matter and illustrate diminution of the natural carbon sequestration in sediments by hydrothermal circulation. Thus, carbon-release to the hydrosphere in Arctic regions is especially relevant in areas where the active Arctic Mid-Ocean Ridge system is in contact with the organic matter rich detrital sediment fans.
doi_str_mv 10.1016/j.gca.2016.05.017
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subjects Arctic mid-ocean ridges
Arctic regions
Brackish
Castles
Circulation
Fluids
Gases
Hydrothermal fluids
Loki’s castle
Marine
Mid-ocean ridges
Ridges
Sediment-influenced
Sediments
Spreading
Ultra-slow spreading ridge
title Fluid composition of the sediment-influenced Loki’s Castle vent field at the ultra-slow spreading Arctic Mid-Ocean Ridge
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