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Onodera, Jonaotaro; Takahashi, Kozo; Jordan, Richard William (2010): (Table 2) Similarity Indexes (Pearson's correlation coefficient) of the silicoflagellate assemblages of IODP Exp302. PANGAEA,

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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 in the euphotic layer, on the basis of the ecology of the modern ebridian Hermesinum adriaticum.
Related to:
Onodera, Jonaotaro; Takahashi, Kozo; Jordan, Richard William (2008): Eocene silicoflagellate and ebridian paleoceanography in the central Arctic Ocean. Paleoceanography, 23, PA1S15,
Latitude: 87.890000 * Longitude: 137.650000
Minimum Elevation: -1251.0 m * Maximum Elevation: -1251.0 m
302-CompSite * Latitude: 87.890000 * Longitude: 137.650000 * Elevation: -1251.0 m * Campaign: Exp302 (Arctic Coring Expedition, ACEX) * Basis: Vidar Viking * Method/Device: Composite Core (COMPCORE) * Comment: Virtual core composed of spliced cores from Holes M0002A, M0003A, M0004A and M0004C. Virtual position and water depth is calculated as the mean of all Exp302 sites.
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).
#NameShort NameUnitPrincipal InvestigatorMethod/DeviceComment
1Similarity indexSimilarityOnodera, JonaotaroModern analog technique (MAT)ACEX Cores Unit 1/6
2Similarity indexSimilarityOnodera, JonaotaroModern analog technique (MAT)ACEX Cores Unit 2
3CommentCommentOnodera, Jonaotaro
4Reference of dataRef dataOnodera, Jonaotaro
20 data points

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