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| Dessandier, Pierre-antoine; Borrelli, Chiara; Yao, Haoyi; Sauer, Simone; Hong, Wei-li; Panieri, Giuliana. |
| Paleoceanographic investigations in the Arctic and north Atlantic are crucial to understanding past and current climate change, in particular considering amounts of pressure-temperature sensitive gas stored in marine sediments of the region. Many paleoceanographic studies are based on foraminiferal oxygen and carbon stable isotope compositions (δ18O, δ13C) from either planktonic specimens, benthic specimens or both. However, in seafloor regions promixal to high upward methane fluxes, such as where seafloor gas emission and shallow gas hydrate-bearing sediment occur, foraminiferal δ18O and δ13C display a wide range of values. Our study focuses on foraminiferal stable isotope signatures in shallow sediment at core sites in the Arctic and North Atlantic... |
| Tipo: Text |
Palavras-chave: Foraminiferal stable isotopes; Gas hydrates; Authigenic carbonates Arctic Ocean; North Atlantic Ocean. |
| Ano: 2020 |
URL: https://archimer.ifremer.fr/doc/00610/72215/71338.pdf |
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| Slagstad, Trond; Roberts, Nick M. W.; Coint, Nolwenn; Hoy, Ingjerd; Sauer, Simone; Kirkland, Christopher L.; Marker, Mogens; Rohr, Torkil S.; Henderson, Iain H. C.; Stormoen, Martin A.; Skar, Oyvind; Sorensen, Bjorn Eske; Bybee, Grant. |
| Recently it has been argued that the Sveconorwegian orogeny in southwest Fennoscandia comprised a series of accretionary events between 1140 and 920 Ma, behind a long-lived, active continental margin characterized by voluminous magmatism and high-grade metamorphism. Voluminous magnesian granitic magmatism is recorded between 1070 and 1010 Ma (Sirdal Magmatic Belt, SMB), with an apparent drop in activity ca. 1010-1000 Ma. Granitic magmatism resumed ca. 1000-990 Ma, but with more ferroan (A type) compositions (hornblende-biotite granites). This ferroan granitic magmatism was continuous until 920 Ma, and included emplacement of an AMCG (anorthosite-mangerite-charnockite-granite) complex (Rogaland Igneous Complex). Mafic rocks with ages corresponding to the... |
| Tipo: Text |
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| Ano: 2018 |
URL: https://archimer.ifremer.fr/doc/00444/55552/57143.pdf |
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| Mcneill, Lisa C.; Shillington, Donna J.; Carter, Gareth D. O.; Everest, Jeremy D.; Gawthorpe, Robert L.; Miller, Clint; Phillips, Marcie P.; Collier, Richard E. Ll; Cvetkoska, Aleksandra; De Gelder, Gino; Diz, Paula; Mai-linh Doan,; Ford, Mary; Geraga, Maria; Gillespie, Jack; Hemelsdael, Romain; Herrero-bervera, Emilio; Ismaiel, Mohammad; Janikian, Liliane; Kouli, Katerina; Le Ber, Erwan; Li, Shunli; Maffione, Marco; Mahoney, Carol; Machlus, Malka L.; Michas, Georgios; Nixon, Casey W.; Oflaz, Sabire Asli; Omale, Abah P.; Panagiotopoulos, Kostas; Pechlivanidou, Sofia; Sauer, Simone; Seguin, Joana; Sergiou, Spyros; Zakharova, Natalia, V; Green, Sophie. |
| Young rifts are shaped by combined tectonic and surface processes and climate, yet few records exist to evaluate the interplay of these processes over an extended period of early rift-basin development. Here, we present the longest and highest resolution record of sediment flux and paleoenvironmental changes when a young rift connects to the global oceans. New results from International Ocean Discovery Program (IODP) Expedition 381 in the Corinth Rift show 10s-100s of kyr cyclic variations in basin paleoenvironment as eustatic sea level fluctuated with respect to sills bounding this semi-isolated basin, and reveal substantial corresponding changes in the volume and character of sediment delivered into the rift. During interglacials, when the basin was... |
| Tipo: Text |
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| Ano: 2019 |
URL: https://archimer.ifremer.fr/doc/00485/59635/62661.pdf |
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