Use of downstream and downfan variation in particle size, roundness, lithology, and form as complements to clast fabric data in paleocurrent analysis

概要

論文の詳細を見る
This study addresses the identification of reliable paleocurrent indices that can be used to complement clast fabric data. Downstream variation in particle size, roundness, lithology and form were examined together with clast orientation in the gravel deposits of the Mitoyo Group, southwest Japan. Although maximum particle size and roundness do not show systematic downstream variation in the braidplain deposit of the Saita Formation, these parameters do show subtle downfan variation in the alluvial fan deposit of the Yakeo Formation. Particle lithology and form show random downstream variation in both formations. These observations suggest that maximum particle size and roundness may be helpful parameters to complement clast fabric data, especially for a small-scale alluvial fan deposit. Particle lithology and form are considered unreliable parameters in paleocurrent interpretation.
日本堆積学会の論文