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Argo Point (scoria cone)

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Argo Point
Argo Point is located in AntarcticaArgo PointArgo PointJason Peninsula, Antarctica
Highest point
Elevation360 m (1,180 ft)
Coordinates66°15′S 60°55′W / 66.25°S 60.92°W / -66.25; -60.92
Geography
LocationJason Peninsula, Antarctica
Parent rangeSeal Nunataks
Geology
Mountain typeVolcanic vent

Argo Point is a scoria cone in Jason Peninsula, Antarctica, at a height of 360 metres (1,180 ft) above sea level. Associated with the Seal Nunataks, the cone has a diameter of 300 metres (980 ft) and its snow-filled crater has a gap on its northern side. The cone is constructed on a formation of lava and scoria over 175 metres (574 ft) thick, which may lie on Jurassic rocks. Glaciers or wind have eroded debris from the cone, forming a "tail" several kilometres long on the ice.

Potassium-argon dating has indicated ages of 1.4-0.9 mya, and the volcano formed in the absence of ice. The cone is constructed from basalt and hawaiite including lava bombs in its sides. Argo Point is related to Seal Nunataks and James Ross Island, and like these its rocks are ocean island basalts. This volcanism may be the consequence of back-arc effects of subduction along the South Shetland trench.

See also

References

  1. ^ "Argo Point". Global Volcanism Program. Smithsonian Institution.
  2. ^ Smellie, J. L. (1990). "D. Graham Land and South Shetland Islands". Volcanoes of the Antarctic Plate and Southern Oceans. Antarctic Research Series. Vol. 48. p. 352. doi:10.1029/AR048p0302. ISBN 0-87590-172-7.
  3. Smellie, J.L. (6 May 2004). "Lithostratigraphy of Miocene–Recent, alkaline volcanic fields in the Antarctic Peninsula and eastern Ellsworth Land". Antarctic Science. 11 (3): 362–378. doi:10.1017/S0954102099000450. S2CID 55742698.
  4. ^ Smellie, John L.; Hole, Malcolm J. (January 2021). "Chapter 4.1a Antarctic Peninsula: volcanology". Geological Society, London, Memoirs. 55 (1): 305–325. doi:10.1144/M55-2018-59. hdl:2164/19331. ISSN 0435-4052.
  5. Haase, Karsten M.; Beier, Christoph (January 2021). "Chapter 3.2b Bransfield Strait and James Ross Island: petrology". Geological Society, London, Memoirs. 55 (1): 285–301. doi:10.1144/M55-2018-37. ISSN 0435-4052.
  6. Jordan, T.A.; Ferraccioli, F.; Jones, P.C.; Smellie, J.L.; Ghidella, M.; Corr, H. (2007). "High-resolution airborne gravity imaging over James Ross Island (West Antarctica)" (PDF). U.S. Geological Survey and the National Academies. Open-File Report. doi:10.3133/ofr20071047SRP060. Retrieved 28 May 2016.
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