Sandy Sediment Distribution on Coral Reefs and Beaches at Several Islands of the Ryukyu Island Arc

• YAMANOUCHI Hideo

  Department of Geography, Faculty of Education, Gunma University

Abstract

In the Ryukyu Island Arc, bioclastic sands containing foraminifera, e. g. Baculogypsina and Calcarina with spines on their tests, are abundant in sands of beaches and reefs. Attrition of the spines of Baculogypsina and Calcarina clarifies habitat and dispersion of these foraminifera at Yoshihara reef in Ishigakijima, where water flow clearly exists due to a distinct channel in the reef flat. At Sesokojima reef where no distinct channel exists, the method of using the attrition of spines on these bioclastic sands is applicable for evaluating transport courses of the bioclastic sands. This method provides a clue to elucidate gain and loss of beach sands in reefal coasts of the Ryukyu Island Arc.

Journal

• Geographical review of Japan, Series B.

  Geographical review of Japan, Series B. 71 (1), 72-82, 1998

  The Association of Japanese Geographers

Keywords

• coral reef
• sediment
• bioclastic sand
• Baculogypsina
• Calcarina
• Ryukyu Island Arc

Details

• CRID: 1390001204329058176
• NII Article ID: 10002793285
• NII Book ID: AA10518430
• DOI: 10.4157/grj1984b.71.72
• ISSN: 21851700
• ISSN: 02896001
• Text Lang: en
• Data Source:
  • JaLC
  • Crossref
  • CiNii Articles
• Abstract License Flag: Disallowed