For the first time, ice‐rafted debris provenance related to the Quaternary glacial discharge and circulation was constrained using radiogenic Sr, Nd, and Pb isotopes from a sedimentary record (Core BN05) from the central Arctic Ocean. The record is composed of glacial/interglacial intervals estimated to span ~0.5 Ma (Marine Isotope Stages [MIS] 1–14). Nd versus Sr isotope data show two end member groups, further elaborated using Pb isotopes. Glacial data mostly point at North American sources with unradiogenic εNd and high ⁸⁷Sr/⁸⁶Sr values, including detrital carbonate (dolomite) layers originating from Paleozoic rocks eroded by the Laurentide Ice Sheet. The opposite end member group including estimated MIS6 and MIS4 samples indicates the Siberian Large Igneous Province eroded by the Eurasian Ice Sheet as the major source, possibly with additional inputs from the East Siberian Ice Sheet. The limited evidence for Siberian Ice Sheet provenance may result from the predominant distribution of this glaciation on the continental shelf providing weak, fine‐grained sediments. Glacial‐time western Arctic circulation inferred from isotopic data is mostly similar to the modern Beaufort Gyre but was more streamlined toward the Fram Strait during some glacial events. Interglacial/major interstadial, presumably sea ice transported sediments, shows a mixture of North American and Siberian sources, consistent with historically observed variations in the Transpolar Drift versus Beaufort Gyre circulation. Isotope pattern in major interglacials (e.g., MIS5e, MIS11, and MIS 13) resembles the recent trend of increased sediment ice transport from the East Siberian/Chukchi Sea, possibly in relation to the ongoing Arctic warming.

中文翻译：

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浮冰碎片的同位素指纹图谱为中第四纪晚期北极环流和冰川历史提供了新的限制

首次使用来自北冰洋中部沉积记录（BN05岩心）的放射性Sr，Nd和Pb同位素限制了与第四纪冰川排放和循环有关的冰筏碎屑物源。该记录由冰期/间冰期间隔组成，估计跨度约为0.5 Ma（海洋同位素阶段[MIS] 1-14）。Nd与Sr同位素的数据显示了两个端成员基团，使用Pb同位素对其进行了进一步的阐述。冰川的数据主要在北美来源与unradiogenic的εNd和高点⁸⁷ SR / ⁸⁶Sr值，包括源自劳伦特德冰盖侵蚀的古生代岩石的碎屑碳酸盐（白云石）层。包括估计的MIS6和MIS4样本在内的另一端成员组表示，西伯利亚大火成岩省被欧亚冰原侵蚀为主要来源，可能还有东西伯利亚冰原的额外投入。西伯利亚冰原起源的有限证据可能是由于这种冰川作用在大陆架上的主要分布而造成的，该大陆架提供了较弱的细颗粒沉积物。从同位素数据推断出的冰川时间西部北极环流与现代的波弗特涡流最相似，但在某些冰川事件中朝着弗拉姆海峡方向更为简化。冰川间/主要的陆间，大概是海冰输送的沉积物，显示了北美和西伯利亚来源的混合，这与历史上观察到的跨极漂移与Beaufort Gyre环流的变化一致。主要界面间（例如MIS5e，MIS11和MIS 13）的同位素模式与最近从东西伯利亚/楚科奇海的沉积物冰运输增加的趋势相似，可能与持续的北极变暖有关。