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| Korff, Lucia; Von Dobeneck, Tilo; Frederichs, Thomas; Kasten, Sabine; Kuhn, Gerhard; Gersonde, Rainer; Diekmann, Bernhard. |
| The carbonate-free abyss of the North Pacific defies most paleoceanographic proxy methods and hence remains a blank spot in ocean and climate history. Paleomagnetic and rock magnetic, geochemical, and sedimentological methods were combined to date and analyze seven middle to late Pleistocene northwest Pacific sediment cores from water depths of 5100 to 5700m. Besides largely coherent tephra layers, the most striking features of these records are nearly magnetite-free zones corresponding to glacial marine isotope stages (MISs) 22, 12, 10, 8, 6, and 2. Magnetite depletion is correlated with organic carbon and quartz content and anticorrelated with biogenic barite and opal content. Within interglacial sections and mid-Pleistocene transition glacial stages MIS... |
| Tipo: Text |
Palavras-chave: Northwest Pacific Ocean; Carbon trapping; Magnetite dissolution; Mid-Pleistocene transition; Tephra layers; Abyssal sediments. |
| Ano: 2016 |
URL: https://archimer.ifremer.fr/doc/00421/53247/54725.pdf |
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| Bianchi, A.. |
| Bacteriological study of abyssal sediments: During the Demeraby mission of the N/O Jean Charcot in the western Atlantic Ocean, a study of the microflora of the digestive tracts of echinoderms (Holothuroidea of various genera, Asteroidea, Echinoidea) was compared with that of the surrounding sediment. The bacterial concentration observed in the digestive tracts of all the animals studied is higher than that in the surrounding sediments. The largest numbers were always found in the most anterior part of the digestive tracts of the holothurians. In some cases, the increase is considerable (7.10 versus 5.2. 10 cells per millilitre): It indicates a proliferation of bacterial cells in the anterior part of the digestive tract. As the sediment moves through the... |
| Tipo: Text |
Palavras-chave: Conchylaceous parks; Microbial communities; Abyssal sediments; Bacteriological study. |
| Ano: 1981 |
URL: http://archimer.ifremer.fr/doc/1981/rapport-1926.pdf |
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