The last glaciation in Orkney, Scotland: glacial stratigraphy, event sequence and flow paths

IF 0.5 4区地球科学 Q4 GEOLOGY Scottish Journal of Geology Pub Date : 2016-10-18 DOI:10.1144/sjg2016-002

A. Hall, J. Riding, J. Brown

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引用次数: 13

Abstract

Three separate till units are recognized on Orkney deposited during the last ice sheet glaciation: the Digger, Scara Taing and Quendal Till members. The Digger Till records an ice advance from the south that extended on to the Atlantic shelf. The Scara Taing Till records a later period of full ice cover when ice moved from the SE out of the Moray Firth and reached Last Glacial Maximum (LGM) limits on the shelf edge. The Quendal Till records a late phase of ice sheet flow from the SE to limits c. 20 km west of Orkney. No till unit or flow set has been identified to confirm the presence of a local ice cap on southern Orkney during the last glaciation. Whilst the blocking presence of the Fennoscandian Ice Sheet (FIS) and the Shetland Ice Cap may have contributed to the deflection of ice flow over Orkney, similar flow patterns also occurred before and after the LGM. Scandinavian erratics on northern Orkney are probably reworked and provide no direct support for the passage of the FIS. Middle to Late Carboniferous palynomorphs found in tills in eastern Orkney may have been reworked from nearby Permian mudstones.

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苏格兰奥克尼岛的最后一次冰期:冰川地层学、事件序列和流动路径

在奥克尼岛上，最后一次冰原冰河时期沉积的三种独立的till单元被认为是:Digger, Scara Taing和Quendal till成员。“挖掘者号”记录了一次从南方延伸到大西洋大陆架的冰移。Scara Taing Till记录了一个较晚的完全冰覆盖时期，当冰从东南移出马里湾并达到大陆架边缘的末次冰盛期(LGM)极限时。昆达尔蒂尔记录了从东南方到奥克尼岛以西约20公里处冰盖流动的后期。在最后一次冰期期间，没有确定任何单位或流集来证实奥克尼岛南部局部冰盖的存在。虽然芬诺斯坎德冰盖(FIS)和设得兰冰盖的阻塞存在可能导致了奥克尼岛上冰流的偏转，但在LGM之前和之后也发生了类似的流动模式。奥克尼群岛北部的斯堪的纳维亚海流可能被重新加工过，无法直接支持FIS的通过。在奥克尼东部的tills中发现的中至晚石炭世的地貌可能是由附近的二叠纪泥岩改造而成的。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Scottish Journal of Geology 地学-地质学

CiteScore

1.70

自引率

0.00%

发文量

审稿时长

>12 weeks

期刊介绍： Although published only since 1965, the Scottish Journal of Geology has a long pedigree. It is the joint publication of the Geological Society of Glasgow and the Edinburgh Geological Society, which prior to 1965 published separate Transactions: from 1860 in the case of Glasgow and 1863 for Edinburgh. Traditionally, the Journal has acted as the focus for papers on all aspects of Scottish geology and its contiguous areas, including the surrounding seas. The publication policy has always been outward looking, with the Editors encouraging review papers and papers on broader aspects of the Earth sciences that cannot be discussed solely in terms of Scottish geology. The diverse geology of Scotland continues to provide an important natural laboratory for the study of earth sciences; many seminal studies in geology have been carried out on Scottish rocks, and over the years the results of much of this work had been published in the Journal and its predecessors. The Journal fully deserves its high reputation worldwide and intends to maintain its status in the front rank of publications in the Earth sciences.