Diatomaceous ooze in a sedimentary core from Mariana Trench: implications for paleoceanography
Jinpeng Zhang , Andrzej Witkowski , Michał Tomczak , Kevin McCartney , Gaowen He , Izabela Zgłobicka
AbstractDiatomaceous ooze sampled from near the Mariana Trench sediment surface by gravity corer (Core JL7KGC05) revealed a high sedimentary abundance of Ethmodiscus rex (Rattray, 1890) Wiseman and Hendey, 1953 frag-ments and tropical open ocean planktonic diatom taxa including Azpeitia nodulifera (Schmidt, 1878) Fryxell and Watkins in Fryxell, Sims and Watkins, 1986 and Alveus marinus (Grunow, 1880) Kaczmarska and Fryxell, 1996. Subsurficial sediments from the ooze are assigned a Marine Isotope Stage 2 age, approximately at the Last Glacial Maximum. The occurrence of Ethmodiscus ooze suggests massive late Pleistocene blooms in the Northwestern Pacific Ocean and provides a plausible link to paleoceanographic and paleoclimatic changes related to Antarctic Intermediate Water mass, which carried a high dissolved silica content as silicon leakage that reduced dissolution rate of diatom frustules. Northward flow of Antarctic Intermediate Water was probably related to surface current migration and southward shift of the Northwest Pacific Gyre to form oligotrophic conditions that triggered Ethmodiscus rex blooms under unusual nutrient recycling conditions within the ocean system. This bloom hypothesis may help explain differential silica dissolution during the last glacial stage.
|Journal series||Acta Geologica Polonica, ISSN 0001-5709, e-ISSN 2300-1887, (N/A 70 pkt)|
|Publication size in sheets||0.8|
|Keywords in English||Diatomaceous ooze, Diatom, Ethmodiscus rex, Mariana Trench, Challenger Deep|
|Internal identifier||ROC 19-20|
|License||Journal (articles only); published final; ; with publication|
|Score||= 70.0, 12-02-2020, ArticleFromJournal|
|Publication indicators||: 2018 = 1.084; : 2018 = 1.344 (2) - 2018=1.324 (5)|
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