Identification of turbidite and hemipelagic mud layers in deep-sea sediments and depositional ages of the hemieplagic mud layers collected at eastern Mikura Island

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  • 御蔵島東方で採取された深海堆積物のタービダイト泥層と半遠洋性泥層の同定と半遠洋性泥層の堆積年代
  • ミクラジマ トウホウ デ サイシュ サレタ シンカイ タイセキブツ ノ タービダイト デイソウ ト ハンエンヨウセイ デイソウ ノ ドウテイ ト ハンエンヨウセイ デイソウ ノ タイセキ ネンダイ

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<p>Here we describe in detail turbidite and hemipelagic mud layers in deep-sea sediments from a core collected from the area east of Mikura-Jima Island. The 196 cm long core sample comprises mainly quartz, volcanic glass, scoria, radiolaria, and foraminifera in silty clay. The silty clay is interbedded with two scoriaceous sand layers deposited as turbidites. We identified the boundaries between hemipelagic and turbidite muds in the silty clay using a variation of grain components and physical properties, as follows. At the boundary, radiolarian and foraminiferal abundances increase, and scoria particles decrease rapidly upwards in the uppermost turbidite muds, whereas these grains are present in consistent numbers throughout the hemipelagic mud layers. Lowest wet bulk density values also indicate the boundary. In addition, we obtained 14C ages of 1296-1171 cal year AD and 2611-2431 cal year BC from the hemipelagic mud layers at 92.5-96.6 and at 33-37 cm depth, respectively.</p>

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