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首页> 外文期刊>Geochemistry, geophysics, geosystems >Mineralogical, geochemical, and magnetic signatures of surface sediments from the Canadian Beaufort Shelf and Amundsen Gulf (Canadian Arctic)
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Mineralogical, geochemical, and magnetic signatures of surface sediments from the Canadian Beaufort Shelf and Amundsen Gulf (Canadian Arctic)

机译：加拿弗特大陆架和阿蒙森湾（加拿大北极）地表沉积物的矿物学、地球化学和磁性特征

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摘要

Mineralogical, geochemical, magnetic, and siliciclastic grain-size signatures of 34 surface sediment samples from the Mackenzie-Beaufort Sea Slope and Amundsen Gulf were studied in order to better constrain the redox status, detrital particle provenance, and sediment dynamics in the western Canadian Arctic. Redox-sensitive elements (Mn, Fe, V, Cr, Zn) indicate that modern sedimentary deposition within the Mackenzie-Beaufort Sea Slope and Amundsen Gulf took place under oxic bottom-water conditions, with more turbulent mixing conditions and thus a well-oxygenated water column prevailing within the Amundsen Gulf. The analytical data obtained, combined with multivariate statistical (notably, principal component and fuzzy c-means clustering analyses) and spatial analyses, allowed the division of the study area into four provinces with distinct sedimentary compositions: (1) the Mackenzie Trough-Canadian Beaufort Shelf with high phyllosilicate-Fe oxide-magnetite and Al-K-Ti-Fe-Cr-V-Zn-P contents; (2) Southwestern Banks Island, characterized by high dolomite-K-feldspar and Ca-Mg-LOI contents; (3) the Central Amundsen Gulf, a transitional zone typified by intermediate phyllosilicate-magnetite-K-feldspar-dolomite and Al-K-Ti-Fe-Mn-VZn- Sr-Ca-Mg-LOI contents; and (4) mud volcanoes on the Canadian Beaufort Shelf distinguished by poorly sorted coarse-silt with high quartz-plagioclase-authigenic carbonate and Si-Zr contents, as well as high magnetic susceptibility. Our results also confirm that the present-day sedimentary dynamics on the Canadian Beaufort Shelf is mainly controlled by sediment supply from the Mackenzie River. Overall, these insights provide a basis for future studies using mineralogical, geochemical, and magnetic signatures of Canadian Arctic sediments in order to reconstruct past variations in sediment inputs and transport pathways related to late Quaternary climate and oceanographic changes.
机译：研究了来自Mackenzie-Beaufort海坡和阿蒙森湾的34个地表沉积物样品的矿物学、地球化学、磁性和硅质碎屑粒度特征，以更好地限制加拿大西部北极地区的氧化还原状态、碎屑颗粒来源和沉积物动力学。对氧化还原敏感的元素（Mn、Fe、V、Cr、Zn）表明，Mackenzie-Beaufort海斜坡和阿蒙森湾内的现代沉积沉积是在含氧底水条件下发生的，混合条件更加湍急，因此阿蒙森湾内盛行含氧水柱。所获得的分析数据，结合多变量统计（特别是主成分和模糊c-means聚类分析）和空间分析，可以将研究区划分为四个具有不同沉积成分的省份：（1）麦肯齐海槽-加拿大蒲堡大陆架，层状硅酸盐-铁氧化铁矿-磁铁矿和Al-K-Ti-Fe-Cr-V-Zn-P含量高;（2）西南班克斯岛，白云石-钾长石和Ca-Mg-LOI含量高;（3）阿蒙森湾中部，以中间层状硅酸盐-磁铁矿-钾-长石-白云岩和Al-K-Ti-Fe-Mn-VZn-Sr-Ca-Mg-LOI含量为特征的过渡带;（4）加拿弗特陆架上的泥火山，其特点是粗粉砂分选不良，石英斜长石自生碳酸盐和Si-Zr含量高，磁化率高。我们的研究结果还证实，加拿弗特大陆架的沉积动力学主要由麦肯齐河的沉积物供应控制。总体而言，这些见解为未来使用加拿大北极沉积物的矿物学、地球化学和磁学特征进行研究提供了基础，以重建过去与晚第四纪气候和海洋学变化相关的沉积物输入和运输途径的变化。

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