Sedimentary facies and the recognition of event deposits intercalated in lacustrine varved deposits in the Middle Pleistocene Miyajima Formation : Sedimentary processes which are taken account of lateral changes

DOI Web Site Web Site 1 Citations 18 References

Bibliographic Information

Other Title
  • 更新統塩原層群宮島層における湖成年縞堆積物に挟在するイベント堆積物の特徴とその識別方法─側方変化を考慮した堆積過程の検討─
  • 更新統塩原層群宮島層における湖成年縞堆積物に挟在するイベント堆積物の特徴とその識別方法 : 側方変化を考慮した堆積過程の検討
  • コウシントウ シオバラソウグン ミヤジマソウ ニ オケル ミズウミ セイネンジマ タイセキブツ ニ キョウザイスル イベント タイセキブツ ノ トクチョウ ト ソノ シキベツ ホウホウ : ソクホウ ヘンカ オ コウリョ シタ タイセキ カテイ ノ ケントウ

Search this article

Abstract

<p>We analyzed the sedimentary facies of deposits from lacustrine events in the Middle Pleistocene Miyajima Formation to test the accuracy of recognition of event deposits induced by floods and slope failures using sedimentary processes taking into account lateral changes in the Middle Pleistocene Hiruzenbara Formation. The Miyajima and Hiruzenbara formations are lacustrine varved and intercalate event deposits, respectively. The event deposits of the lower section of the study area can be observed horizontally. The paleo-Shiobara Lake, which contains the Miyajima Formation deposits, is smaller and closer to the source than the paleo-Hiruzenbara Lake, which contains the Hiruzenbara Formation deposits and many intercalate event deposits. It is difficult to recognize these Miyajima Formation event deposits because varve deposits include inflow material. Thus, the accuracy of recognition of event deposits is verified. Flood event deposits continue laterally, while the thicknesses and sedimentary facies of slope failure deposits change laterally. Hyperpycnite, hypopycnite, and homopycnite are affected by paleo lake environments and can be distinguished by sedimentary processes taking into account lateral changes. Hyperpycnite erode a lower layer and relative lateral changes are observed in its layer. Hypopycnite and homopycnite do not erode, and the thicknesses and sedimentary facies of their layers remain approximately laterally continuous and uniform.</p>

Journal

Citations (1)*help

See more

References(18)*help

See more

Related Projects

See more

Keywords

Details 詳細情報について

Report a problem

Back to top