HR: 08:20h
AN: OS21C-02    [Abstracts]
TI: Arnarnesstrytur: A Recently Discovered Active Shallow Marine Hydrothermal System in Eyjafjördur, Iceland.
AU: * Gautason, B
EM: bg@isor.is
AF: Iceland Geosurvey, Rangarvellir P.O.Box 30, Akureyri, 602 Iceland
AU: * Gautason, B
EM: bg@isor.is
AF: University of Akureyri, Borgir, Nordurslod, Akureyri, 600 Iceland
AU: Valtysson, H T
EM: hreidar@unak.is
AF: University of Akureyri, Borgir, Nordurslod, Akureyri, 600 Iceland
AU: Valtysson, H T
EM: hreidar@unak.is
AF: Marine Research Institute, Borgir, Nordurslod, Akureyri, 600 Iceland
AU: Einarsson, H
EM: hei@unak.is
AF: University of Akureyri, Borgir, Nordurslod, Akureyri, 600 Iceland
AU: Eythorsdottir, A
EM: arnh@unak.is
AF: University of Akureyri, Borgir, Nordurslod, Akureyri, 600 Iceland
AU: Bogason, E
EM: erlendur@eyjar.is
AF: University of Akureyri, Borgir, Nordurslod, Akureyri, 600 Iceland
AU: Steingrimsson, S A
EM: simmi@hafro.is
AF: Marine Research Institute, Borgir, Nordurslod, Akureyri, 600 Iceland
AB: A recently discovered system of shallow marine hydrothermal vents from the fjord Eyjafjördur in Iceland is described. The vent system is located north of Arnarnes, a small spit on the west side of the fjord. The system is comprised of several hydrothermal chimneys or clay-stacks forming a 500 m long line trending approximately north-south. Depth to the surrounding sea-floor is close to 25 m at the south end, extending to over 50 m at the north end. Individual chimneys or clay-stacks rise up to 10 m above the seafloor. The chimneys are comprised of poorly crystalline clay resulting from precipitation reactions involving mixing of hot fresh hydrothermal fluid and cold seawater. In addition to focused discharge associated with the clay-stacks, pervasive flow through bottom sediment has been observed.The micro- and macro-biology of the area is now also under investigation. Maximum temperatures of fluids discharging from the vents measured to date is 77°C. Chemistry of fluid-samples recovered from the vents may be modeled as a fresh hydrothermal fluid, contaminated with less than 1% of ambient seawater.
DE: 0450 Hydrothermal systems (1034, 3017, 3616, 4832, 8135, 8424)
DE: 1034 Hydrothermal systems (0450, 3017, 3616, 4832, 8135, 8424)
DE: 3017 Hydrothermal systems (0450, 1034, 3616, 4832, 8135, 8424)
DE: 3035 Midocean ridge processes
DE: 4832 Hydrothermal systems (0450, 1034, 3017, 3616, 8135, 8424)
SC: Ocean Sciences [OS]
MN: Fall Meeting 2005