Seal Nunataks Volcanic Field

sopka (bez známé erupce za posledních ~12 000 let), Antarctica, Antarctic-Scotia Volcanic Regions

Kde

Antarctica, Antarctic-Scotia Volcanic Regions

Typ (GVP)

Pyroclastic cone(s)

Nadmořská výška

368 m

Poloha

-65,030°, -60,050°

The Seal Nunataks are a group of 16 isolated nunataks emerging from the Larsen Ice Shelf east of Graham Land Peninsula. Most of the larger nunataks are considered to represent separate volcanic vents erupted in a shallow-water environment. Fumarolic activity was reported from Murdoch and Dallman cones in 1982, and fresh-looking pyroclastics and a lava flow at Dallman (not observed in 1979) were seen on the ice surface three years later (González-Ferrán, 1983). Fumarolic activity was observed at Christensen in 1893, and Lindenberg was observed in eruption in 1893. Baker (1968) saw cinders on the ice surface, suggesting a 20th-century eruption, and similar observations were reported in 1985 and 2010, but these events may have been due to aeolian tephra redistribution. A 1988 British expedition noted that tephra away from nunataks was found only in ice-cored moraines, suggesting a glacial rather than pyroclastic origin. They noted no fumarolic activity, although water vapor resulting from radiant heating of ice-cored moraines was observed.

Text: Smithsonian Global Volcanism Program.

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