Supercritical-flow sedimentary structures of fluvial deposits in the Plio-Pleistocene Katata Formation, Kobiwako Group, Japan

DOI Web Site Web Site 46 References

Bibliographic Information

Other Title
  • 河川堆積物にみられる高流砂階の堆積構造：鮮新-更新統古琵琶湖層群堅田層
  • カセン タイセキブツ ニ ミラレル コウリュウサ カイ ノ タイセキ コウゾウ : センシン-コウシントウ コ ビワコソウグンケンデンソウ

Search this article

Abstract

<p>Sedimentary structures related to supercritical-flows, including antidunes, chutes-and-pools and cyclic steps, have been identified from fluvial flood deposits in the Plio-Pleistocene Katata Formation, Kobiwako Group, Shiga, Japan. The characteristics of sedimentary structures by high-energy flood flows are 1) backset laminae and back-stepping lamina sets with up-stream migration, 2) sigmoidal, wavy and HCS-mimics laminae, 3) scour and fill gravel, sand and mud, 4) cyclically scoured erosional bases, and 5) mixed beds with heterolithic and well and poorly sorted deposits. The observed sedimentary structures considered as supercritical-flow deposits have high diversity. The deposits with much mud-content show fast sedimentation rate from the supercritical-flows contained large amount of suspended mud. We have to observe furthermore the sedimentary structures linked to supercritical-flow bedforms from deposits of various ages, areas and depositional environments.</p>

Journal

References(46)*help

See more

Keywords

Details 詳細情報について

Report a problem

Back to top