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| Straub, M.; Tremblay, M. M.; Sigman, D. M.; Studer, A. S.; Ren, H.; Toggweiler, J. R.; Haug, G. H.. |
| Surface nitrate concentration is a potentially useful diagnostic in reconstructing the past circulation of high-latitude North Atlantic waters. Moreover, nutrient consumption in the North Atlantic surface impacts the atmospheric concentration of carbon dioxide. To reconstruct nutrient conditions in the subpolar North Atlantic region during the last ice age, a record of foraminifera-bound delta N-15 was measured in Neogloboquadrina pachyderma (sin.) from core V28-73 south of Iceland (57.2 degrees N, 20.9 degrees W). Foraminifera-bound delta N-15 is up to 2 parts per thousand lower during the last ice age than during the Holocene, suggesting as much as similar to 25% less complete nitrate consumption during the former. This is consistent with stronger light... |
| Tipo: Text |
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| Ano: 2013 |
URL: https://archimer.ifremer.fr/doc/00262/37308/35721.pdf |
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| Blumberg, S.; Lamy, F.; Arz, H. W.; Echtler, H. P.; Wiedicke, M.; Haug, G. H.; Oncken, O.. |
| The active plate margin of South America is characterized by a frequent occurrence of large and devastating subduction earthquakes. Here we focus on marine sedimentary records off Southern Chile that are archiving the regional paleoseismic history over the Holocene and Late Pleistocene. The investigated records - Ocean Drilling Program (ODP) Site 1232 and SONNE core 50SL - are located at similar to 40 degrees S and similar to 38 degrees S, within the Peru-Chilc trench, and are characterized by frequent interbedded strata of turbiditic and hemipelagic origin. On the basis of the sedimentological characteristics and the association with the active margin of Southern Chile, we assume that the turbidites are mainly scismically triggered, and may be considered... |
| Tipo: Text |
Palavras-chave: Turbidite frequency; Earthquake recurrence; Chile active margin; Trench deposits; Paleoseismology; Paleoclimate. |
| Ano: 2008 |
URL: https://archimer.ifremer.fr/doc/00237/34850/33217.pdf |
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