Periglacial landscape evolution and environmental changes of Arctic lowland areas for the last 60 000 years (western Laptev Sea coast, Cape Mamontov Klyk)
Periglacial landscape evolution and environmental changes of Arctic lowland areas for the last 60 000 years (western Laptev Sea coast, Cape Mamontov Klyk)
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近6万年来北极低地地区的冰缘地貌演变和环境变化（拉普捷夫海西部海岸，马蒙托夫角）
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发表时间：
2008
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通讯作者：
F. Preusser
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作者：
Lutz Schirrmeister;G. Grosse;V. Kunitsky;D. Magens;H. Meyer;A. Dereviagin;T. Kuznetsova;Andrei A. Andreev;O. Babiy;F. Kienast;M. Grigoriev;Paul Pier Overduin;F. Preusser
西伯利亚东北部的非冰川北极低地在第四纪晚期经历了广泛的景观和环境变化。沿北极陆架海的沿海悬崖暴露出陆地档案，其中载有保存在永久冻土中的许多古环境指标(例如，花粉、植物大型化石和哺乳动物化石)。马蒙托夫·克莱克角提供的沉积学(粒度、磁化率和生物地球化学参数)、冰冻学、地质年代学(放射性碳、加速器质谱仪和红外激发发光)、重矿物和古生态记录记录了过去60年来泰米尔半岛以东北冰架低地的环境动态，从而记录了欧亚冰盖东部边缘附近的环境动态。这一地区也被认为是Beringia的最西端，Beringia是晚更新世时位于欧亚冰盖和劳伦西亚冰盖之间的非冰川大陆。提出了几个砂岩沉积、泥炭-砂蚀变、富冰古冰土层序(冰杂岩)和热岩溶洼地和山谷的泥炭填充物的单位和亚单位。记录的替代数据集反映了60至50 Kya之间的寒冷气候条件，50至25 Kya之间的中等内陆条件，以及25至15 Kya之间的寒冷气候条件。记录了晚更新世至全新世的过渡，包括阿勒罗德暖期、早中全新世热最佳时期和晚全新世降温时期。在示意图模型中提出了河流/冲积、不规则坡面径流和热岩溶三个阶段的景观动态，并与魏氏早期至全新世的超区域环境历史进行了关联。
Non-glaciated Arctic lowlands in north-east Siberia were subjected to extensive landscape and environmental changes during the Late Quaternary. Coastal cliffs along the Arctic shelf seas expose terrestrial archives containing numerous palaeoenvironmental indicators (e.g., pollen, plant macro-fossils and mammal fossils) preserved in the permafrost. The presented sedimentological (grain size, magnetic susceptibility and biogeochemical parameters), cryolithological, geochronological (radiocarbon, accelerator mass spectrometry and infrared-stimulated luminescence), heavy mineral and palaeoecological records from Cape Mamontov Klyk record the environmental dynamics of an Arctic shelf lowland east of the Taymyr Peninsula, and thus, near the eastern edge of the Eurasian ice sheet, over the last 60 Ky. This region is also considered to be the westernmost part of Beringia, the non-glaciated landmass that lay between the Eurasian and the Laurentian ice caps during the Late Pleistocene. Several units and subunits of sand deposits, peat–sand alternations, ice-rich palaeocryosol sequences (Ice Complex) and peaty fillings of thermokarst depressions and valleys were presented. The recorded proxy data sets reflect cold stadial climate conditions between 60 and 50 Kya, moderate inderstadial conditions between 50 and 25 Kya and cold stadial conditions from 25 to 15 Kya. The Late Pleistocene to Holocene transition, including the Allerød warm period, the early to middle Holocene thermal optimum and the late Holocene cooling, are also recorded. Three phases of landscape dynamic (fluvial/alluvial, irregular slope run-off and thermokarst) were presented in a schematic model, and were subsequently correlated with the supraregional environmental history between the Early Weichselian and the Holocene.