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Sea-Surface Dynamics Changes in the subpolar North Atlantic Ocean (IODP Site U1314) during Late Pliocene Climate Transition Based on Calcareous Nannofossil Observation

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Open Journal of Geology 2017年第10期7卷 1538-1551页

作者： Resti Samyati Jatiningrum Tokiyuki Sato Department of Geosciences Geotechnology and Materials Engineering for Resources Akita University Akita Japan Faculty of International Resources Sciences Akita University Akita Japan

Calcareous nannofossils were observed to reconstruct the surface water conditions during late Pliocene climate transition (2.55 to 2.88 Ma) from the southern Gardar Drift, in the subpolar North Atlantic IODP Site U1314 (56°21.9’1N, 27°53.3’W). A total of 24 species from 14 genera were identified by polarizing microscope observation. The coccolith assemblages are dominated by species belonging to genus Reticulofenestra with different (size-defined) morphotype. Hence, changes in paleoceanographic condition are shown by the size variation of Reticulofenstraspecimens. Before ~2.76 Ma, the studied interval is characterized by the presence of an abundant larger Reticulofenstra group. It indicates warm oligotrophic and stable surface waters. At ~2.76 Ma the abundance of large Reticulofenstra decreased abruptly and alternated with small Reticulofenstra, suggesting collapse of sea surface stability with strong mixing condition. This event coeval with the final closure of the Central American Seaway (CAS) and the onset of intensified North Hemisphere Glaciation (NHG). Subsequently, the size variation of Reticulofenestra specimens exhibits a sequential pattern that is somewhere consistent with the interglacial-glacial cycle. The pattern begins with a gradual increase in size upward during interglacial suggesting warm oligotrophic and stable condition, and ends with an abrupt decrease in coccolith size during glacial suggesting eutrophic or strong mixing condition and destabilized sea surface waters.

关键词： Late Pliocene Sea-Surface Waters Conditions Calcareous Nannofossil subpolar North Atlantic

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Conodonts from Lower Silurian Strata of the subpolar Urals

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地学前缘 2009年第S1期16卷 251-251页

作者： Sokolova Liubov Institute of Geology Pervomajskaya Str 54167982 Syktyvkar

The distribution of Lower Silurian conodonts from the sections on the Kozhym River was studied first by S.V. *** additional studies of the Upper Ordovician-Lower Silurian strata,Oulodus? ***, Walliserodus ***,Panderod... 详细信息

关键词： conodonts Lower Silurian subpolar Urals

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