Volcanic ash preserved in marine sediment sequences is key for independent synchronization of palaeoclimate records within and across different climate archives. Here we present a continuous tephrostratigraphic record from the Labrador Sea, spanning the last 65–5 ka, an area and time period that has not been investigated in detail within the established North Atlantic tephra framework. We investigated marine sediment core GS16‐204‐22CC for increased tephra occurrences and geochemically analysed the major element composition of tephra shards to identify their source volcano(es). In total we observed eight tephra zones, of which five concentration peaks show isochronous features that can be used as independent tie‐points in future studies. The main transport mechanism of tephra shards to the site was near‐instantaneous deposition by drifting of sea ice along the East Greenland Current. Our results show that the Icelandic Veidivötn volcanic system was the dominant source of tephra material, especially between late Marine Isotope Stage (MIS) 4 and early MIS 3. The Veidivötn system generated volcanic eruptions in cycles of ca. 3–5 ka. We speculate that the quantity of tephra delivered to the Labrador Sea was a result of variable Icelandic ice volume and/or changes in the transportation pathway towards the Labrador Sea.

中文翻译：

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来自拉布拉多海的连续岩相记录，记录了最后65 ka

保存在海洋沉积物序列中的火山灰是独立同步不同气候档案内部和之间的古气候记录的关键。在这里，我们展示了来自拉布拉多海的连续地层岩石记录，跨越了最后的65-5 ka，该区域和时间段尚未在已建立的北大西洋地弗拉框架内进行详细调查。我们调查了海底沉积物岩心GS16-204-22CC的提夫拉发生率，并通过地球化学分析了提夫拉碎片的主要元素组成，以确定其源火山。总的来说，我们观察到了八个提弗拉区，其中五个浓度峰显示出等时性特征，这些特征可以在以后的研究中用作独立的联系点。特非拉碎片向现场的主要运输机制是沿东格陵兰洋流的海冰漂移几乎是瞬时沉积。我们的结果表明，冰岛的Veidivötn火山系统是提非拉物质的主要来源，特别是在海洋同位素阶段（MIS）4和MIS 3早期之间。3-5 ka。我们推测输送到拉布拉多海的提菲拉数量是冰岛冰量变化和/或向拉布拉多海的运输路径变化的结果。Veidivötn系统以大约1个周期的周期产生火山喷发。3-5 ka。我们推测输送到拉布拉多海的提菲拉数量是冰岛冰量变化和/或向拉布拉多海的运输路径变化的结果。Veidivötn系统以大约1个周期的周期产生火山喷发。3-5 ka。我们推测输送到拉布拉多海的提菲拉数量是冰岛冰量变化和/或向拉布拉多海的运输路径变化的结果。