The progressive development of microfabrics from initial deposition to slump deformation: an example from a modern sedimenary mélange on the Nankai Prism
| العنوان: | The progressive development of microfabrics from initial deposition to slump deformation: an example from a modern sedimenary mélange on the Nankai Prism |
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| المؤلفون: | Toshiya Kanamatsu, Kiichiro Kawamura, Mebae Kuranaga |
| المصدر: | Journal of the Geological Society. 177:619-628 |
| بيانات النشر: | Geological Society of London, 2019. |
| سنة النشر: | 2019 |
| مصطلحات موضوعية: | geography, geography.geographical_feature_category, 010504 meteorology & atmospheric sciences, Drilling, Geology, Fault (geology), Pure shear, 010502 geochemistry & geophysics, 01 natural sciences, Prism (geology), Slump, Simple shear, Sedimentary rock, Petrology, Slumping, 0105 earth and related environmental sciences |
| الوصف: | The progressive development of microfabrics from initial deposition to slump deformation and then a submarine slide was investigated in an active subduction zone using cores recovered during the Integrated Ocean Drilling Program Expedition 333. A Pleistocene–Holocene sequence was recovered at Site C0018A, which was located on a slope basin on the footwall of the megasplay fault in the Nankai Trough, SW Japan. Six mass-transport deposit units intercalated with coherent intervals were recovered from the upper 190 m of the drilled succession. The initial microfabrics in the undeformed hemipelagic sediments were characterized by random and porous fabrics composed predominantly of clay aggregations and connectors. The initial fabrics were cardhouse fabrics, which consist of clay flakes with edge-to-edge (E–E) and/or edge-to-face (E–F) contacts. These initial microfabrics developed into compacted microfabrics, which are random and consolidated fabrics (bookhouse fabrics) that consist of clay flakes with E–F and/or face-to-face (F–F) contacts and develop during burial as a pure shear deformation. During slumping, these fabrics were then deformed under simple shear to become predominantly F–F contacts and form clay chains. Thus, the microfabrics in these submarine slides are a sedimentary melange that developed locally into a preferred clay orientation with F–F contacts. Supplementary material: A schematic illustration showing sedimentation processes and fabrics is available at https://doi.org/10.6084/m9.figshare.c.4483385Test Thematic collection: This article is part of the Polygenetic melanges collection available at: https://www.lyellcollection.org/cc/polygenetic-melangesTest |
| تدمد: | 2041-479X 0016-7649 |
| الوصول الحر: | https://explore.openaire.eu/search/publication?articleId=doi_________::389d5ea61768dc0606e21e041c24ace4Test https://doi.org/10.1144/jgs2018-218Test |
| حقوق: | CLOSED |
| رقم الانضمام: | edsair.doi...........389d5ea61768dc0606e21e041c24ace4 |
| قاعدة البيانات: | OpenAIRE |
| تدمد: | 2041479X 00167649 |
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