The sedimentological, geochemical, physical and magnetic properties of 40 surface and basal sediment samples of box cores collected throughout the Canadian Arctic Archipelago (CAA) from the Canadian Beaufort Shelf to Lancaster Sound were analyzed to determine the sedimentary processes that operate within the CAA during the pre- and post-industrial periods (i.e., before and after 1900 Common Era or CE). In addition, the chronology of seven selected regional cores was established using ²¹⁰Pb measurements, where the base is dated between 1550 and 1820 CE. These cores provide an opportunity to robustly compare post-1900 sedimentary conditions with those of the colder Little Ice Age period (LIA; ∼1500–1900 CE). The different properties combined with multivariate statistical analyses result in the identification of three regional provinces with distinct sedimentary characteristics: (a) the West province (Mackenzie Shelf/Slope, west Banks Island and M'Clure Strait) typified by detrital associations (Fe-Rb-Ti-Zn), high organic matter inputs, dominance of magnetite and low-coercivity minerals and high aluminosilicate contents; (b) the Intermediate Zone (Amundsen and Coronation gulfs) distinguished by Si-Al-Zr-Sr-K associations, Mn oxyhydroxides precipitation, constant high magnetic grain concentrations and a mixture between marine and terrigenous organic matter; and (c) the East Province (Queen Maud Gulf, Victoria and Barrow straits, and Lancaster and Eclipse sounds) described by high detrital carbonate inputs, marine organic matter, a dominance of high-coercivity minerals and high magnetic concentrations in pre-industrial samples. Our results confirm that the pre- and post-industrial sedimentary dynamics are controlled by sediment supplies from the river discharges in the West and Intermediate provinces, whereas the East province is more influenced by sea ice and coastal erosion. Basal sediment samples from the seven ²¹⁰Pb-dated cores suggest an intensification of the Mackenzie, Coppermine, and Ellice rivers runoff, extensive sea-ice cover and consequently sediment transport by the latter during the LIA period.

中文翻译：

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加拿大北极群岛内的沉积过程：沉积学、地球化学和磁性沉积物特性之间的关系

分析了从加拿大博福特大陆架到兰开斯特海峡的整个加拿大北极群岛 (CAA) 中收集的 40 个箱形岩芯表面和基底沉积物样本的沉积学、地球化学、物理和磁性特性，以确定在前和后工业时期（即 1900 年共同时代或 CE 前后）。此外，七个选定区域核心的年表是使用²¹⁰Pb 测量值，其中基准日期在公元 1550 年至 1820 年之间。这些岩心提供了一个机会，可以将 1900 年后的沉积条件与较冷的小冰河时代（LIA；~1500-1900 CE）的沉积条件进行比较。不同的属性结合多元统计分析，确定了三个具有不同沉积特征的区域省份：(a) 以碎屑组合 (Fe-Rb) 为代表的西部省 (Mackenzie Shelf/Slope、west Banks Island 和 M'Clure Strait) -Ti-Zn)、高有机质输入、磁铁矿和低矫顽力矿物的优势以及高铝硅酸盐含量；(b) 以 Si-Al-Zr-Sr-K 缔合、Mn 羟基氧化物沉淀为特征的中间带（阿蒙森湾和加冕湾），恒定的高磁性颗粒浓度以及海洋和陆源有机物质的混合物；(c) 东部省（Queen Maud Gulf、Victoria 和 Barrow 海峡，以及 Lancaster 和 Eclipse 的声音）由高碎屑碳酸盐输入、海洋有机物、高矫顽力矿物的优势和工业化前样品中的高磁性浓度描述. 我们的研究结果证实，工业化前和工业化后的沉积动力学受西部和中间省河流排放的沉积物供应控制，而东部省受海冰和海岸侵蚀的影响更大。来自七个的基础沉积物样本 海洋有机质、高矫顽力矿物的主导地位和工业化前样品中的高磁性浓度。我们的研究结果证实，工业化前和工业化后的沉积动力学受西部和中间省河流排放的沉积物供应控制，而东部省受海冰和海岸侵蚀的影响更大。来自七个的基础沉积物样本 海洋有机质、高矫顽力矿物的主导地位和工业化前样品中的高磁性浓度。我们的研究结果证实，工业化前和工业化后的沉积动力学受西部和中间省河流排放的沉积物供应控制，而东部省受海冰和海岸侵蚀的影响更大。来自七个的基础沉积物样本²¹⁰ Pb 测年的岩心表明，在 LIA 期间，Mackenzie、Coppermine 和 Ellice 河的径流、广泛的海冰覆盖以及后者的沉积物迁移加剧。