Discrimination of sources of terrigenous sediment deposited in the central Arctic Ocean through the Cenozoic
Discrimination of sources of terrigenous sediment deposited in the central Arctic Ocean through the Cenozoic
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北冰洋中部新生代陆源沉积物来源判别
DOI：
10.1029/2007pa001567
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发表时间：
2009
期刊：
影响因子：
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通讯作者：
M. Kölling
中科院分区：
文献类型：
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作者：
N. Martinez;R. Murray;G. Dickens;M. Kölling
[1]我们分析了一套沉积物样品在北冰洋中部的主要，微量和稀土元素，以评估整个新生代陆源物质的变化。陆源组分由两个端员组成。来自页岩状成分的输入占主体沉积物的主导地位，特别是古新世和中新世以来沉积的沉积物，并且可能代表来自拉普捷夫海东部的沉积物供应。因此，即使环境和运输机制可能有不同的冰占主导地位的无冰，早第三纪和晚第三纪的序列似乎已经受到一个单一的主要陆源。这表明，通过新生代的重要部分，洋流和漂流流具有类似的运输能力和轨迹。从始新世早期到中新世中期，来自更多镁铁质来源的影响似乎更重要，最有可能代表来自拉普捷夫海西部或喀拉海的物质。因此，始新世地表水生产力的主要变化似乎与陆源物源的变化大致同步。区域海平面变化、当地大陆架过程和运输机制的组合是观测到的源变化的更可能的原因。尽管目前使用化学的源的分配受到缺乏来自某些区域的数据的限制（例如，东西伯利亚海），我们的研究结果基本上同意矿物学或放射性同位素的基础上的推断，并进一步阐明了长期重建的北冰洋中部。
[1] We analyzed a suite of sediment samples recovered in the central Arctic Ocean for major, trace, and rare earth elements in order to assess changes in terrigenous source material throughout the Cenozoic. The terrigenous component consists of two end-members. Input from a shale-like composition dominates bulk sediments, especially those deposited during the Paleocene and since the Miocene, and may represent sediment supply from the eastern Laptev Sea. Therefore, even though the environment and transport mechanisms may have varied from ice free to ice dominated, sequences of the early Paleogene and later Neogene appear to have been influenced by a single major terrigenous source. This suggests similar transport capabilities and trajectories for both ocean and drift currents through significant parts of the Cenozoic. Influence from a more mafic source appears to be more important through the early Eocene to the middle Miocene and most likely represents material from the western Laptev Sea or Kara Sea. Thus, Eocene major changes in surface water productivity appear broadly synchronous with those in terrigenous provenance. A combination of regional sea level variations, local shelf processes, and transport mechanisms are among the more probable causes for the observed source changes. Although the assignment of sources using chemistry presently is constrained by a lack of data from certain regions (e.g., eastern Siberian Sea) our results generally agree with inferences based on mineralogy or radiogenic isotopes and shed further light on long-term reconstructions of the central Arctic Ocean.
影响因子：
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作者：
Backman, Jan;Jakobsson, Martin;Heil, Chip
通讯作者：
Heil, Chip
影响因子：
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作者：
O’Regan M;Moran K;Backman J;Jakobsson M;Sangiorgi F;Brinkhuis H;Pockalny R;Skelton A;Stickley C;Brumsack H-J;Willard D
通讯作者：
Willard D
北极晚古新世 - 早始新世古环境，特别强调古新世 - 始新世热最大值（罗蒙诺索夫海岭，综合海洋钻探计划远征 302）
影响因子：
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作者：
Sluijs A;Röhl U;Schouten S;Brumsack H-J;Sangiorgi F;Sinninghe Damsté J;Brinkhuis H
通讯作者：
Brinkhuis H