Lithostratigraphy of the uppermost Fossil Bluff Group (Early Cretaceous) of Alexander Island, Antarctica: History of an Albian regression
Lithostratigraphy of the uppermost Fossil Bluff Group (Early Cretaceous) of Alexander Island, Antarctica: History of an Albian regression
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南极洲亚历山大岛最上部化石崖群（早白垩世）的岩石地层学：阿尔布回归的历史
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发表时间：
1993
期刊：
影响因子：
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通讯作者：
S. Kelly
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作者：
A. Moncrieff;S. Kelly
亚历山大岛东南部的化石崖群包含年龄从启莫里阶到阿尔布阶的地层，代表南极半岛火山弧以西的弧前盆地的填充物。最近的实地工作在已定义的 4000 米上方发现了大约 2800 米的较年轻的岩石，包括之前描述的冥王星冰川地层的顶部。在冥王星冰川组顶部附近定义了一个新单元，即土卫五角成员。上面的序列被命名为海王星冰川组，由三个成员组成：火卫二山脊、特里顿点和火星冰川成员。他们代表了 Fossil Bluff 集团最年轻的部分。火卫二岭和火星冰川部分都是完全海洋的，但特里顿点部分的年龄为晚阿尔布阶，包含 6.8 公里地层中唯一的紧急情况记录。它是一个河流单元，拥有广阔的化石森林地平线，其中有高达 5 m 的直立树木，被广泛的洪水沉积物保存下来。因此，海王星冰川形成记录了阿尔布时代的一个显着的海退循环。
The Fossil Bluff Group of south-east Alexander Island contains strata ranging from Kimmeridgian to Albian in age and represents the infill of a fore-arc basin to the west of the Antarctic Peninsula volcanic arc. Recent field work has identified approximately 2800 m of younger rock above the 4000 m already defined, including the top of the previously described Pluto Glacier Formation. A new unit, the Rhea Corner Member is defined, near the top of the Pluto Glacier Formation. The sequence above this is named as the Neptune Glacier Formation, comprising three members, the Deimos Ridge, Triton Point and Mars Glacier members. They represent the youngest part of the Fossil Bluff Group. Both the Deimos Ridge and Mars Glacier members are fully marine, but the Triton Point Member, which is late Albian in age, contains the only record of emergent conditions in 6.8 km of strata. It is a fluvial unit and contains extensive fossil forest horizons, with standing trees up to 5 m tall preserved by widespread flood deposits. The Neptune Glacier Formation therefore records a significant regression-transgression cycle of Albian age.