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首页> 外文期刊>Earth and Planetary Science Letters: A Letter Journal Devoted to the Development in Time of the Earth and Planetary System >Lake Agassiz drainage bracketed Holocene Hudson Bay Ice Saddle collapse
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Lake Agassiz drainage bracketed Holocene Hudson Bay Ice Saddle collapse

机译：喀斯兹湖排水般的全新世哈德森湾冰马鞍崩溃

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摘要

The duration and intensity of the early Holocene freshening events has been explained by subglacial outburst(s) from Lake Agassiz, the collapse of a Laurentide Ice Sheet 'saddle' overlying Hudson Bay, and/or a combination of the two events. Our field evidence provides new radiocarbon ages and geomorphologic observations to assess the deglacial history of this important region, allowing for revision of the sequence of events. We show that the collapse of the Hudson Bay Ice Saddle in southwestern Hudson Bay occurred between 8.57 +/- 0.28 ka BP and 8.11 +/- 0.19 ka BP. This event was preceded by at least one subglacial-drainage event through numerous newly-mapped subglacial channels onshore of southwestern Hudson Bay. Lake Agassiz may have experienced multiple subglacial drainage events prior to the final HBIS collapse, accounting for the timing discrepancies in freshwater cooling observed in the North Atlantic. Importantly, this new work links the chronology of events on the southwest (land-based) side of the HBIS to the northeast (marine-based) side of the ice sheet. Additionally, this work provides a potential analog for the behaviour of other ice sheets whose beds lie well below sea level, such as the West Antarctic Ice Sheet, during periods of warming climate. (C) 2020 Elsevier B.V. All rights reserved.
机译：早期全新月新兴事件的持续时间和强度已被来自乔治斯湖的底紫杉突发，劳伦德冰块'鞍座覆盖的哈德逊湾的崩溃和/或两种事件的组合。我们的现场证据提供了新的无线电碳变性和地貌观察，以评估这一重要地区的沮丧历史，允许修改事件顺序。我们展示哈德森湾哈德森湾冰鞍的崩溃发生在8.57 +/- 0.28 KA BP和8.11 +/- 0.19 KA BP之间。这一事件前面是通过西南哈德森湾陆上陆上众多新映射的下透视渠道的至少一个底层排水事件。乔西湖可能在最终HBIS崩溃之前经历了多种底纤维排水事件，占北大西洋淡水冷却中的时间差异。重要的是，这项新工作将HBIS的西南（基于陆地）一侧的事件的年表链接到冰盖的东北（船用）侧面。此外，这项工作为其他冰盖的行为提供了潜在的模拟，其其他冰盖的行为良好地低于海平面，例如西南极冰盖，在温暖的气候期间。 （c）2020 Elsevier B.v.保留所有权利。

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