Deformation structures in shale bed indicate flow direction of overlying Miocene subaqueous pyroclastic flow |
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Authors: | Kazuhiko Kano Shun Nakano Koji Mimura |
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Affiliation: | (1) Geology Department, Geological Survey of Japan, 1-3, Higashi 1-chome, 305 Tsukuba, Ibaraki, Japan |
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Abstract: | Thrusts, pinch-and-swell structures and undulations are present within a 2-m-thick layered shale bed of Miocene age that is overlain by a rhyolite subaqueous pyroclastic flow deposit 2–3 m thick. The deformation structures were caused by loading and lateral compression by the subaqueous pyroclastic flow, probably analogous to those observed in layered muds deformed by a sand mass advancing across them. Prominent thrusts strike east-west and dip south, and the crests of undulations strike east-west, indicating that the subaqeuous pyroclastic flow moved northward. |
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