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Deep-water mass source and dynamic associated with rapid climatic variations during the last glacial stage in the North Atlantic: A multiproxy investigation of the detrital fraction of deep-sea sediments 5
Ballini, M; Kissel, C; Colin, C; Richter, T.
[1] In order to investigate North Atlantic Deep Water (NADW) dynamics and variability during the last glacial stage, a very high resolution multiproxy analysis of the detrital fraction of sediments deposited during Heinrich event 4 and Dansgaard-Oeschger cycles 8 and 7 has been conducted on three deep-sea cores. These cores are distributed along the path of the North Atlantic Deep Water from the Faeroe Shetland Channel to the Reykjanes ridge and the Irminger basin. The concentration in fine-grained magnetites, the Ti-content, and the smectite percentage within the clay minerals show similar and coeval fluctuations at each site and are comparable from one site to the other. This is the imprint of the detrital fraction originating from the northern basaltic...
Tipo: Text Palavras-chave: Glacial period; Dansgaard-Oeschger cycles; North Atlantic; Bottom water circulation; Magnetic properties; Clay minerals.
Ano: 2006 URL: https://archimer.ifremer.fr/doc/00235/34585/33077.pdf
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Interglacial responses of the southern Greenland ice sheet over the last 430,000 years determined using particle-size specific magnetic and isotopic tracers 5
Hatfield, Robert G.; Reyes, Alberto V.; Stoner, Joseph S.; Carlson, Anders E.; Beard, Brian L.; Winsor, Kelsey; Welke, Bethany.
The past behavior of the Greenland ice sheet can provide important insight into climatic thresholds that may initiate and drive major ice-sheet retreat. Particle-size-specific magnetic and Sr–Nd–Pb isotope records from Eirik Ridge sediments south of Greenland track southern Greenland ice sheet (sGIS) erosional signatures over the past ∼430 ka by discriminating changes in sediment source and transport over the Eirik Ridge. Ground-truthed magnetic and isotopic compositions of subglacial silt from south Greenland's Precambrian bedrock terranes constrain independent magnetic and isotopic estimates of Eirik Ridge silt provenance, which in turn indicate that the southern Greenland ice sheet (sGIS) retreated within its present margin during three of the four...
Tipo: Text Palavras-chave: South Greenland ice sheet; Sediment tracing; Radiogenic isotopes; Magnetic properties; Quaternary climate change; Sea-level rise.
Ano: 2016 URL: https://archimer.ifremer.fr/doc/00353/46384/46007.pdf
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Magnetic mineral diagenesis in the river-dominated inner shelf of the East China Sea, China 5
Ge, Can; Zhang, Weiguo; Dong, Chenyin; Dong, Yan; Bai, Xuexin; Liu, Jinyan; Thi Thu Hien, Nguyen; Feng, Huan; Yu, Lizhong.
The inner shelf of the East China Sea is a river-dominated margin characterized by fine-grained mud deposits and a rapid sedimentation rate. Three short sediment cores (similar to 2.7m in length) were examined to characterize spatial variations in magnetic mineral diagenesis. The sediment cores were analyzed for sedimentation rates, magnetic properties, particle size distribution, organic carbon, and total sulfur content. The two more proximal cores with higher sedimentation rates (similar to 2.2cm/yr and similar to 0.96cm/yr) do not exhibit obvious effects of reductive dissolution of magnetite with increasing depth, which is consistent with their lower total sulfur content. The offshore core, A12-4, which has a lower sedimentation rate, contains clear...
Tipo: Text Palavras-chave: Magnetic properties; Diagenesis; Organic matter reactivity; Sedimentation rate; River-dominated margin; East China Sea.
Ano: 2015 URL: https://archimer.ifremer.fr/doc/00351/46256/46079.pdf
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