Evidence for full-glacial flow and retreat of the Late Weichselian Ice Sheet from the waters around Kong Karls Land, eastern Svalbard
Evidence for full-glacial flow and retreat of the Late Weichselian Ice Sheet from the waters around Kong Karls Land, eastern Svalbard
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晚威克塞尔冰盖从斯瓦尔巴群岛东部孔卡尔斯地周围水域全冰川流动和退缩的证据
DOI：
10.1016/j.quascirev.2010.05.026
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发表时间：
2010
影响因子：
4
通讯作者：
Hogan K
中科院分区：
文献类型：
--
作者：
Hogan K
海洋地球物理和地质数据从周围的孔卡尔斯土地在斯瓦尔巴群岛东部的海底被用来重建晚Weichselian全冰川流动动力学和巴伦支海冰盖（BSIS）的退缩历史。在末次盛冰期（LGM）期间，地面冰在整个地区延伸，并在孔卡尔地群岛侧面的宽阔水深槽中产生了流线型沉积地貌。这些地貌是由于冰盖底部的冰下过程而在冰下冰碛物中形成的。鼓和山洞对证实，区域冰流是朝着东北偏东通过槽。由于没有冰缘退缩特征，奥尔加海峡、埃里克·埃里克森海峡和孔卡尔斯地东北部无名深海的冰消作用似乎在槽的较深、较外部迅速。相比之下，在槽的较浅的部分，冰衰退较慢，较小的reavances/still-stands的冰缘导致形成的退缩冰碛。在冰消期，冰裂槽较深处形成临时的冰裂湾，冰裂冰山通过冰裂槽撤离冰缘。在奥尔加海峡形成的接地区特征表明，这里的撤退是渐进的，并被较长的静止林所打断。从一个接地冰盖的过渡到冰近端的设置是由附近的冰缘的融水羽沉积层压泥序列局部标记。融水衍生相的存在表明，融化也可能是一个显着的冰在撤退的损失机制。在更广泛的背景下，这项研究是对斯瓦尔巴特群岛以东海底的首次调查之一，提供了在完全冰川条件下冰向东北偏东方向流失的证据。在末次冰期期间，来自BSIS这一部分的冰是大弗朗兹维多利亚海槽古冰流的重要贡献者。
Marine-geophysical and geological data from the seafloor surrounding Kong Karls Land in eastern Svalbard are used to reconstruct Late Weichselian full-glacial flow dynamics and retreat history of the Barents Sea Ice Sheet (BSIS). Grounded ice extended over the entire area during the Last Glacial Maximum (LGM) and produced streamlined sedimentary landforms in the broad bathymetric troughs that flank the Kong Karls Land archipelago. The landforms were produced in subglacial till as a result of subglacial processes at the base of the ice sheet. Drumlins and hill–hole pairs confirm that regional ice-flow was towards the east–northeast through the troughs. Based on the absence of ice-margin recessional features, deglaciation in Olga Strait, Erik Eriksen Strait and the unnamed deep northeast of Kong Karls Land appears to have been rapid in the deeper, outer parts of the troughs. In contrast, in the shallower parts of the troughs, ice recession was slower and minor readvances/still-stands of the ice margin resulted in the formation of recessional moraines. During deglaciation, temporary calving bays formed in the deeper parts of the troughs and calved icebergs were evacuated away from the ice margin through the troughs. Grounding-zone features formed in Olga Strait indicate that retreat here was gradual and punctuated by longer still-stands. The transition from a grounded ice sheet to ice-proximal settings is marked locally by a laminated mud sequence deposited from meltwater plumes from a nearby ice margin. The presence of meltwater-derived facies suggests that melting may have also been a significant ice loss mechanism during retreat. In a broader context, this study is one of the first investigations of the seafloor east of Svalbard, providing evidence that ice drained towards the east-northeast during full-glacial conditions. Ice from this part of the BSIS was an important contributor to the palaeo-ice stream in the large Franz Victoria Trough during the LGM.
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作者：
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DOI：
--
发表时间：
2007
期刊：
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作者：
M. Forwick;T. Vorren
通讯作者：
T. Vorren
DOI：
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发表时间：
2007
期刊：
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DOI：
--
发表时间：
2006
期刊：
影响因子：
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作者：
J. Wellner;D. C. Heroy;John B. Anderson
通讯作者：
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