New mapping and dating of volcanic outcrops on the east coast of Admiralty Bay, King George Island, has demonstrated that Eocene volcanic sequences are dominant and also crop out extensively elsewhere, particularly on the eastern part of the island. The sequences can be divided into at least three formations (Hennequin, Cape Vauréal and Carruthers Cliff) together with Eocene strata at Warkocz and near Lions Rump that are currently unassigned stratigraphically. New and recently published 40Ar/39Ar ages indicate that all of the formations are Early Eocene in age, mainly Ypresian, extending to Lutetian and possibly even Priabonian time in more easterly outcrops. Compositional contrasts exist between the groups (calc-alkaline vs tholeiitic). The formations are mainly composed of lavas, and many show evidence for contemporary inundation by water. They are interbedded with sedimentary rocks deposited mainly during flooding events as debris flows, debris avalanches, hyperconcentrated flows, from traction currents and in lakes. The common presence of juvenile volcanic detritus suggests that the sediments were probably linked to explosive hydrovolcanic eruptions, some of which were possibly rooted in summit ice caps. Other evidence is also permissive, but the presence of Eocene ice on King George Island is not well established at present.

中文翻译：

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南极洲南设得兰群岛乔治王岛东部始新世火山序列的岩石地层学、年龄和分布

乔治王岛金钟湾东海岸火山露头的新测绘和测年表明，始新世火山序列占主导地位，并且在其他地方也广泛出现，特别是在该岛东部。这些层序可分为至少三个地层（Hennequin、Cape Vauréal 和 Carruthers Cliff）以及 Warkocz 和 Lions Rump 附近的始新世地层，这些地层目前未分配。新的和最近发布的40氩气/39Ar年龄表明，所有地层的年龄都是早始新世，主要是伊普里期，延伸到鲁特西亚，甚至可能在更偏东的露头中延伸到普里雅本期。组之间存在组成对比（钙碱性对比拉斑沸石）。这些地层主要由熔岩组成，许多显示出当代被水淹没的证据。它们与主要在洪水事件期间沉积的沉积岩互层，如泥石流、碎屑雪崩、超浓缩流、牵引流和湖泊中的沉积岩。少年火山碎屑的普遍存在表明沉积物可能与爆炸性水火山喷发有关，其中一些可能植根于山顶冰盖。其他证据也是允许的，但目前还没有很好地确定乔治王岛上是否存在始新世冰。