Landscape evolution and ice-sheet behaviour in a semi-arid polar environment: James Ross Island, NE Antarctic Peninsula
Landscape evolution and ice-sheet behaviour in a semi-arid polar environment: James Ross Island, NE Antarctic Peninsula
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DOI：
10.1144/sp381.1
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发表时间：
2013-01-01
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影响因子：
--
通讯作者：
Nyvlt, Daniel
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文献类型：
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作者：
Davies, Bethan J.;Glasser, Neil F.;Nyvlt, Daniel
这项景观演化研究提供了新的现代和古过程-地貌数据，并分析了南极半岛冰盖从末次冰盛期(LGM)、全新世到现在的行为。描述和解释了南极半岛东北部詹姆斯罗斯岛乌卢半岛的六种沉积-地貌组合：(1)冰川冰雪组合；(2)与冰川沉积有关的冰川成因组合，包括冷基和湿基冰流分别沉积的不稳定-贫冰和不稳定-富漂流；(3)中全新世冰川再进积的Boulder Train组合；(4)发现于小型环状冰川前的冰芯Moraine组合；(5)副冰川组合，包括尖峰、鹅卵石-巨石滞后以及滨海和河流过程；(6)冰缘组合，包括岩石冰川、冰缘堡垒、块体、溶蚀裂隙和大片花纹地面。在这种半干旱的极地环境中，冰川、副冰川和冰缘过程之间的相互作用对于理解多成因地貌非常重要。至关重要的是，冷基冰能够形成和改变沉积物和地貌。这个陆地系统模型可以帮助解释过去的环境，但也提供了新的数据，以帮助重建最后一个冰盖淹没詹姆斯罗斯岛。
This study of landscape evolution presents both new modern and palaeo process-landform data, and analyses the behaviour of the Antarctic Peninsula Ice Sheet through the Last Glacial Maximum (LGM), the Holocene and to the present day. Six sediment-landform assemblages are described and interpreted for Ulu Peninsula, James Ross Island, NE Antarctic Peninsula: (1) the Glacier Ice and Snow Assemblage; (2) the Glacigenic Assemblage, which relates to LGM sediments and comprises both erratic-poor and erratic-rich drift, deposited by cold-based and wet-based ice and ice streams respectively; (3) the Boulder Train Assemblage, deposited during a Mid-Holocene glacier readvance; (4) the Ice-cored Moraine Assemblage, found in front of small cirque glaciers; (5) the Paraglacial Assemblage including scree, pebble-boulder lags, and littoral and fluvial processes; and (6) the Periglacial Assemblage including rock glaciers, protalus ramparts, blockfields, solifluction lobes and extensive patterned ground. The interplay between glacial, paraglacial and periglacial processes in this semi-arid polar environment is important in understanding polygenetic landforms. Crucially, cold-based ice was capable of sediment and land-form genesis and modification. This landsystem model can aid the interpretation of past environments, but also provides new data to aid the reconstruction of the last ice sheet to overrun James Ross Island.