Glacial seismic geomorphology and Plio-Pleistocene ice sheet history offshore northwest Europe
Glacial seismic geomorphology and Plio-Pleistocene ice sheet history offshore northwest Europe
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欧洲西北部近海冰川地震地貌和普里奥-更新世冰盖历史
DOI：
10.1144/sp525-2023-117
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发表时间：
2023
期刊：
影响因子：
--
通讯作者：
Newton A
中科院分区：
文献类型：
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作者：
Newton A
上更新世冰筏碎屑的记录表明，欧洲西北部的冰盖经常到达海岸线。然而，这些记录对冰盖输送碎屑的频率、范围和动态的了解有限。欧洲西北部冰川边缘的三维反射地震数据先前记录了埋藏地貌，使我们了解了这些不确定性。本文回顾了这些现有记录，并将其与新的地震地貌观测相结合，对欧洲冰川边缘的地貌进行了分类，并考虑了它们与冰盖历史的关系。该汇编显示早更新世冰盖定期推进穿过大陆架。与中晚更新世相比，早更新世海平面重建显示出较小的波动幅度，并且更广泛/频繁的早更新世冰川作用可能与海平面重建不匹配。我们对这一证据与全球冰川作用记录进行了讨论，以考虑对我们更广泛地了解上更新世气候变化可能产生的影响，特别是早更新世海平面记录捕获冰盖体积变化的程度。解决这些问题取决于地貌的测年效果如何，它们是否可以与其他代理数据集相关，以及这些代理重建过去气候变化幅度的准确程度。关于欧洲和其他地方更新世冰川作用的许多问题仍然存在。
Plio-Pleistocene records of ice-rafted detritus suggest NW European ice sheets regularly reached coastlines. However, these records provide limited insight on the frequency, extent and dynamics of ice sheets delivering the detritus. Three-dimensional reflection seismic data of the NW European glaciated margin have previously documented buried landforms that inform us on these uncertainties. This paper reviews and combines these existing records with new seismic geomorphological observations to catalogue landform occurrence along the European glaciated margin and considers how they relate to ice sheet history. The compilation shows Early Pleistocene ice sheets regularly advanced across the continental shelves. Early Pleistocene sea-level reconstructions demonstrate lower magnitude fluctuations compared to the Middle–Late Pleistocene, and more extensive/frequent Early Pleistocene glaciation provides a possible mismatch with sea-level reconstructions. This evidence is discussed with global records of glaciation to consider possible impacts on our wider understanding of Plio-Pleistocene climate changes, in particular how well Early Pleistocene sea-level records capture ice sheet volume changes. Resolving such issues relies on how well landforms are dated, whether they can be correlated with other proxy datasets, and how accurately these proxies reconstruct the magnitudes of past climatic changes. Many questions about Pleistocene glaciation in Europe and elsewhere remain.