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.

本数据集是对本网站下登录存档的DOI为10.18739/A2GM81Q31的原始数据的更新与扩展，该原始数据源自凯勒赫等（Kelleher et al., 2022）2022年发表于《北极、南极与高山研究》（Arctic, Antarctic and Alpine Research）第54卷第1期、页码395-347的研究成果，其关联DOI为doi.org/10.1080/15230430.2022.2110689。本次更新后的数据涵盖3根沉积物岩芯的全新年代模式、增补的有孔虫组合数据，以及新增的X射线荧光光谱（X-Ray Fluorescence, XRF）数据。本后续研究的核心目标为记录兰开斯特海峡主干冰流以及布西亚-兰开斯特冰流（Boothia-Lancaster Ice Stream, BLIS）的退缩历史，并将末次冰盛期（Last Glacial Maximum, LGM）与巴芬湾碎屑碳酸盐（Baffin Bay Detrital Carbonate, BBDC）事件沉积对应的全新世演化历史建立关联。全新的有孔虫数据被用于约束古环境参数，结合新获取的放射性碳测年数据，我们对岩相形成了全新的认知，该认知统一了巴芬湾所有岩芯的年代模式，并阐明了BBDC事件的成因（詹宁斯等，Jennings et al., 2025）。本数据集还涵盖了针对厚壁新方球虫（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，用以探究冰消作用开启帕里通道与内尔斯海峡后，太平洋源北极表层水流入的地球化学证据；相关研究论文由马奇托等（Marchitto et al.）基于同一套沉积物岩芯撰写，目前处于筹备阶段。