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Visualization of the Internal Structure of the Massive Division in Experimental Sediment-Gravity-Flow Deposits by Mapping of Grain Fabric
from Kyoto University Research Information Repository (2006/5/1 9:00:00)
from Kyoto University Research Information Repository (2006/5/1 9:00:00)
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 feat ...
Cretaceous to Paleocene depositional history of North-Pacific subduction zone: reconstruction from the Nemuro Group, eastern Hokkaido, northern Japan
from Kyoto University Research Information Repository (2003/2/1 9:00:00)
from Kyoto University Research Information Repository (2003/2/1 9:00:00)
タイトル: Cretaceous to Paleocene depositional history of North-Pacific subduction zone: reconstruction from the Nemuro Group, eastern Hokkaido, northern Japan著者: Naruse, Hajime抄録: The Campanian-Paleocene Nemuro Group comparing the oldest strata in the Kuril Arc, is distributed in the east of Hokkaido Island, northern Japan. Strata of the group in this region are sedimentologically classified into eight depositional facies, most of which are interpreted as sediment gravity flow deposits. These depositional facies comprise four facies associations. The distal and proximal basin plain facies associations are composed mainly of hemipelagic mudstones and sandstones that are interpreted as gravity flow deposits, and were deposited in a topographically flat environment inferred by good lateral continuity of lithofacies. The channel-levee complex and submarine slope facies associations, in contrast, are composed of hemipelagic mudstone, turbidites and debris flow deposits. These f ...
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