For better understanding of the Southern Ocean history using fossil diatoms and chrysophytes

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Other Title
  • 南極域環境変遷のさらなる理解に向けて : 珪藻および黄金色藻化石研究の現状と課題
  • ミナミキョクイキ カンキョウ ヘンセン ノ サ ラ ナル リカイ ニ ムケテ : ケイソウ オヨビ オウゴンショクソウ カセキ ケンキュウ ノ ゲンジョウ ト カダイ

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Abstract

The hard parts, such as calcareous shell and siliceous valve, of the zoo- and phytoplankton including foraminifers and diatoms are preserved in sediments as microfossil. They have been used to know the sedimentary ages and paleoenvironment. In the Southern Ocean, several paleoceanographic studies have been continued using microfossils from the sediments. However, detailed ecological preference of the marine plankton, which is essential for paleoenvironmental reconstruction, has not completely clarified yet, due to the difficulty of gaining access to the Southern Ocean. In addition, their taphonomy (i.e., what kind of influence suffers them during sedimentation and fossilization) is still poorly understood. Furthermore, there is little ecological information on the extinct species, which preclude their use as facies fossils. In this paper, we review recent results of the paleoenvironmental reconstruction in the Southern Ocean using fossil diatoms and chrysophytes, and then discuss several problems of paleontological/paleoceanographic studies.

Journal

  • 低温科学

    低温科学 76 95-119, 2018-03-31

    低温科学第76巻編集委員会

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