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タイトル: | Visualization of the Internal Structure of the Massive Division in Experimental Sediment-Gravity-Flow Deposits by Mapping of Grain Fabric |
著者: | Naruse, Hajime Masuda, Fujio |
著者名の別形: | 成瀬, 元 増田, 富士雄 |
キーワード: | experimental studies fabric flume studies grains gravity flows image analysis mapping sedimentary structures SEM data visualization |
発行日: | May-2006 |
出版者: | Society for Sedimentary Geology |
誌名: | Journal of Sedimentary Research |
巻: | 76 |
号: | 5 |
開始ページ: | 854 |
終了ページ: | 865 |
抄録: | A method for mapping of grain fabric is proposed for analysis of the cryptic internal structure of massive sedimentary units. The method is applied to the analysis of an experimental debris-flow deposit, revealing a number of characteristic features of this type of mass sedimentation. The debris flow was simulated in the laboratory using a channel inclined 30° opening onto a 10° slope, and transverse thin sections were prepared from four longitudinal points in the depositional lobe. Back-scattered electron images of the sections obtained by scanning electron microscopy were processed and analyzed by mapping of grain fabric using an automated image-analysis procedure. Although the samples appear structureless by macroscopic observation, the grain-fabric map reveals a range of sedimentary features, including distinctive lineations from lower-upcurrent to upper-downcurrent in the most proximal section representing synsedimentary thrusts, a steepening-upward trend of grain imbrication angle in intermediate samples with very low-angle imbrication in the basal horizon, indicative of high-shear-rate flow, and complex imbrication features in the most distal samples. This analysis reveals that massive debris-flow deposits actually contain a range of distinctive structures which are characteristic of the mode of deposition and which are not identifiable by visible inspection or analysis of grain size or color. The proposed method is therefore of great utility for the investigation and characterization of massive deposits. |
著作権等: | Accepted for publication in [Journal of Sedimentary Research][76(5):May 2006; https://doi.org/10.2110/jsr.2006.063]© 2006, SEPM (Society for Sedimentary Geology) This is not the published version. Please cite only the published version. この論文は出版社版でありません。引用の際には出版社版をご確認ご利用ください。 |
URI: | http://hdl.handle.net/2433/286858 |
DOI(出版社版): | 10.2110/jsr.2006.063 |
出現コレクション: | 学術雑誌掲載論文等 |
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