Northern Baffin Bay sediment core evidence for Boothia-Lancaster Ice stream retreat from Last Glacial Maximum extent and for its role in the origin of Baffin Bay Detrital Carbonate (BBDC) Events 0, 1 and 2 (2019-2024)

This dataset is an update and extension of data lodged at this site under doi:10.18739/A2GM81Q31 and stemming from Kelleher et al., 2022 published in Arctic, Antarctic and Alpine Research, vol. 54, no 1, p. 395-347, doi.org/10.1080/15230430.2022.2110689. This updated data include new age models, additional foraminiferal assemblage data, and new X-Ray fluorescense (XRF) data on the 3 sediment cores. The goal of the continued research is to document the retreat history of the trunk ice stream in Lancaster Sound, the Boothia-Lancaster ice stream (BLIS) and to relate this Last Glacial Maximum (LGM) to Holocene history with deposition of the Baffin Bay Detrital Carbonate (BBDC) events. The new foraminiferal data are used to constrain the paleoenvironments, and with new radiocarbon dates we have new understanding of the lithofacies which have unified the age models and the origin of BBDC events in cores throughout Baffin Bay (Jennings et al., 2025). The dataset also includes Inductively Coupled Plasma Mass Spectrometry (ICP-MS) trace metal data on N. pachyderma exploring geochemical evidence of inflow of Pacific-sourced Arctic Surface Water as Parry Channel and Nares Strait opened by deglaciation, a manuscript in preparation by Marchitto and others on the same set of sediment cores.

本数据集是对本平台下已提交的数字对象标识符（Digital Object Identifier, DOI）为10.18739/A2GM81Q31的数据集的更新与扩展，该数据集源自2022年发表于《Arctic, Antarctic and Alpine Research》（北极、南极与高山研究）第54卷第1期第395-347页的Kelleher及其团队的研究，其官方DOI链接为doi.org/10.1080/15230430.2022.2110689。本次更新后的数据集包含3根沉积物岩芯的新年代模型、新增的有孔虫组合数据，以及新的X射线荧光（X-Ray Fluorescence, XRF）测试数据。本项持续研究的目标是记录兰开斯特海峡（Lancaster Sound）主干冰流、布西亚-兰开斯特冰流（BLIS）的退缩历史，并将该末次盛冰期（Last Glacial Maximum, LGM）与巴芬湾碎屑碳酸盐（BBDC）事件沉积对应的全新世（Holocene）演化历史相联系。新获得的有孔虫数据被用于约束古环境重建，结合新的放射性碳测年结果，我们对岩相有了全新的认识，这统一了巴芬湾所有岩芯的年代模型，并阐明了BBDC事件的成因（Jennings等人，2025）。本数据集还包含针对厚壳新抱球虫（Neogloboquadrina pachyderma, N. pachyderma）的电感耦合等离子体质谱（Inductively Coupled Plasma Mass Spectrometry, ICP-MS）痕量金属数据，用于探究冰消作用导致帕里通道（Parry Channel）与内尔斯海峡（Nares Strait）开启后，太平洋源北极表层水流入的地球化学证据；相关研究论文由Marchitto及其团队基于同一套沉积物岩芯撰写，目前处于在编待刊状态。