Drifting Pumice Clasts Derived from Ulleung Island in Early Holocene Sediments at Oda, Shimane Prefecture, Southwestern Japan.

• Sawada Yoshihiro

  Department of Geoscience, Faculty of Science and Engineering, Shimane University

• Nakamura Tadashi

  Department of Geoscience, Faculty of Science and Engineering, Shimane University

• Umeda Yoshihisa

  Department of Geoscience, Faculty of Science and Engineering, Shimane University

• Yoon Sun

  Department of Geology, College of Science, Pusan National University

• Tokuoka Takao

  Department of Geoscience, Faculty of Science and Engineering, Shimane University

Bibliographic Information

Other Title

• 島根県大田市の掘削コアから発見された欝陵島の完新世初期火山活動由来の漂着軽石
• シマネケン オオダシ ノ クッサク コア カラ ハッケンサレタ ウツリョウトウ

Abstract

A 2cm-thick pumice layer (Hane pumice bed) occurred within Early Holocene sediments at a depth of -13.6m in drill core samples from Lake Hane, east of Oda City, Shimane Prefecture. The pumice layer lies below the Kikai Akahoya tephra (6, 300 years BP). The pumice is trachytic in composition, consisting of glass, sanidine, clinopyroxene, kaersutite, biotite, and a small amount of plagioclase. Based on comparison of the chemical compositions of whole rock, glass, and constituent minerals from pumices from Ulleung Island, and the widespread Late Quaternary tephra of the San'in region, it is concluded that the Hane pumice is correlative with the lower part of the U-4 tephra at Ulleung Island. This occurs below the Ulleung-Oki tephra (U-Oki), which is dated at 9, 300 years BP. The sedimentary succession in which the pumice bed is intercalated becomes finer in an upward direction, indicating transgression in the early Holocene. Therefore, the age of the pumice is less than 10Ka BP. On the basis of the mode of occurrence of the Hane pumice and its sedimentary environment, it is not an air fall deposit, but was transported by an ocean current from Ulleung Island, about 300km distant from Hane. The pumice, which drifted ashore and was deposited, is important to the understanding of sea level change, since the occurrence gives a record of the paleo-sea level and currents in the area.

Journal

• The Quaternary Research (Daiyonki-Kenkyu)

  The Quaternary Research (Daiyonki-Kenkyu) 36 (1), 1-16, 1997

  Japan Association for Quaternary Research

Keywords

• 欝陵隠岐テフラ
• 完新世
• 山陰地方
• 欝陵島
• 漂着軽石
• 古汀線
• 波根軽石

Details

• CRID: 1390282681472441728
• NII Article ID: 10002634337
• NII Book ID: AN0034136X
• DOI: 10.4116/jaqua.36.1
• ISSN: 18818129
• ISSN: 04182642
• ISSN: http://id.crossref.org/issn/04182642
• NDL BIB ID: 4159549
• Web Site: https://ndlsearch.ndl.go.jp/books/R000000004-I4159549
• Text Lang: ja
• Data Source:
  • JaLC
  • NDL
  • Crossref
  • CiNii Articles
• Abstract License Flag: Disallowed