(Table 2) Similarity Indexes (Pearson's correlation coefficient) of the silicoflagellate assemblages of IODP Exp302 ...

The silicoflagellate and ebridian assemblages in early middle Eocene Arctic cores obtained by IODP Expedition 302 (ACEX) were studied in order to decipher the paleoceanography of the upper water column. The assemblages in Lithologic Unit 2 (49.7-45.1 Ma), one of the biosiliceous intervals, were usua...

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Bibliographic Details
Main Authors: Onodera, Jonaotaro, Takahashi, Kozo, Jordan, Richard William
Format: Dataset
Language:English
Published: PANGAEA 2010
Subjects:
Similarity index
Comment
Reference of data
Composite Core
Modern analog technique MAT
Exp302
CCGS Captain Molly Kool Vidar Viking
Integrated Ocean Drilling Program / International Ocean Discovery Program IODP
Arctic
Arctic Ocean
Online Access:https://dx.doi.org/10.1594/pangaea.733882
https://doi.pangaea.de/10.1594/PANGAEA.733882
Description
Summary:The silicoflagellate and ebridian assemblages in early middle Eocene Arctic cores obtained by IODP Expedition 302 (ACEX) were studied in order to decipher the paleoceanography of the upper water column. The assemblages in Lithologic Unit 2 (49.7-45.1 Ma), one of the biosiliceous intervals, were usually endemic as compared to the assemblages that occurred outside of the Arctic Ocean. The presence of these endemic assemblages is probably due to a unique environmental setting, controlled by the degree of mixing between the low-salinity Arctic waters and relatively high salinity waters supplied from outside the Arctic Ocean, such as the Atlantic and possibly the Western Siberian Sea. Using the basin-to-basin fractionation model, the early middle Eocene Arctic Ocean corresponds to an estuarine circulation type, which includes the modern-day Black Sea. The abundant down-core occurrence of ebridians strongly suggests the past presence of low-salinity waters, and may indicate that low oxygen concentrations prevailed ... : From Onodera and Takahashi (submitted manuscript, 2008a). The calculation is based on binary data (presence or absence of each species). The italicized values represent the significant correlation coefficients (p < 0.05). ...

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