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1 Bulletin of the Polish Academy of Sciences. Earth Sciences

1 2002

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Sedimentary Features of a Tertiary Lahar on King George Island, South Shetland Islands, West Antarctica

Birkenmajer K., Gradziński R., Porębski Sz.

Bulletin of the Polish Academy of Sciences. Earth Sciences

2002

Vol. 50, nr 1

81-97

A coarse diamictite (agglomerate) up to 34 m thick consisting mainly of angular basaltic lava clasts occurs within Tertiary terrestrial stratiform volcanic succession at Admiralty Bay, King George Island (South Shetland Islands, West Antarctica). At some sites, it interfingers with coeval basaltic lava flows. The coarse diamictite is interpreted as a lahar developed from low-maturity debris flows triggered either by volcanic eruptions or by less of stability by water-saturated weathering covers. Diamictites with predominantly rounded clasts, and sandstone -the products of short-lived short-distance reworking and sorting by running water, are subordinate.