none 10.1144/SP501-2019-44 Geological Society of London Geological Society of London 1881 112821275 65091 2024111903363400791 10.1144 2024-11-19T11:40:40Z 2020-01-07T13:19:17Z 0 Geological Society, London, Special Publications SP 0305-8719 2041-4927 05 30 2021 01 2021 501 1 Kiichiro Kawamura Graduate School of Science and Technology for Innovation, Yamaguchi University, 1677-1 Yoshida, Yamaguch-city, Yamaguchi 753-8512, Japan https://orcid.org/0000-0003-0501-4033 Mebae Kuranaga Graduate School of Science and Technology for Innovation, Yamaguchi University, 1677-1 Yoshida, Yamaguch-city, Yamaguchi 753-8512, Japan Taiheiyo Consultant Co. Ltd, 2-2-4 Daisaku, Sakura-city, Chiba 285-0802, Japan Kenta Mochizuki Graduate School of Science and Technology for Innovation, Yamaguchi University, 1677-1 Yoshida, Yamaguch-city, Yamaguchi 753-8512, Japan Toshiya Kanamatsu Japan Agency for Marine Science and Technology, 2-15 Natsushima, Yokosuka, Kanagawa 237-0046, Japan https://orcid.org/0000-0002-7108-4534 Abstract The progressive development of microfabrics in sediments was investigated in an active subduction zone using cores recovered during the Integrated Ocean Drilling Program Expedition 362. A sequence of Paleocene–Holocene rock was recorded at Site U1480, which is located in the Sunda Trench, south of Sumatra. Hemipelagic clayey sediments from the drilled succession were recovered from a depth of 1327.23 m. Cardhouse fabrics were observed initially, consisting of clay flakes with edge-to-edge (E–E) or edge-to-face (E–F) contacts. These initial microfabrics developed into compacted bookhouse fabrics (which are random and consolidated), and consist of clay flakes with E–F or face-to-face (F–F) contacts as the domain. These microfabrics developed due to individual particle sliding. Bookhouse fabric developed into a shape-preferred orientation of clay minerals with F–F contacts as a shaly fabric due to domain sliding. Finally, clay flakes with F–F contacts deformed into an undulated shape due to further increased overburden pressure. These pervasive fabrics comprising clay flakes stacked with F–F contacts resisted shear deformation due to their strong cohesion. This strong cohesion in the undulated shaly fabric might be an important factor in the locking of shallow tsunami-generating slip in subduction zones. 01 29 2020 01 2021 343 351 10.1144/SP501-2019-44 1 10.1144/crossmark-policy www.lyellcollection.org true 2019-04-16 2019-11-20 2019-11-23 2020-01-29 Japan Society for the Promotion of Science http://dx.doi.org/10.13039/501100001691 20340139 https://doi.org/10.15223/policy-002 10.1144/SP501-2019-44 https://www.lyellcollection.org/doi/10.1144/SP501-2019-44 https://www.lyellcollection.org/doi/pdf/10.1144/SP501-2019-44 https://pubs.geoscienceworld.org/UrlRedirectHandler.ashx?routename=books&chapterdoi=10.1144/SP501-2019-44&request=chapter 10.1007/978-94-009-4684-2 Journal of Sedimentary Petrology Bennett R.H. 217 50 1981 Clay fabric of selected submarine sediments: fundamental properties and models BennettR.H., BryantW.R. and KellerG.H. 1981. Clay fabric of selected submarine sediments: fundamental properties and models. Journal of Sedimentary Petrology, 50, 217–232. 10.1126/science.1189373 Expedition 362 Preliminary Report: Sumatra Subduction Zone Dugan B. 2017 DuganB., McNeillL.C., PetronotisK.E. and the Expedition 362 Scientists. 2017. Expedition 362 Preliminary Report: Sumatra Subduction Zone. International Ocean Discovery Program, La Jolla, CA, https://doi.org/10.14379/iodp.pr.362.2017 10.1016/j.marpetgeo.2019.08.007 10.1346/CCMN.1993.0410103 Sedimentary Basin Einsele G. 1990 EinseleG. 1990. Sedimentary Basin. Springer, New York. 10.1016/S0070-4571(08)70841-0 FairbridgeR.W. 1967. Phases of diagenesis and authigenesis. Developments in Sedimentology 8 19–89 https://doi.org/10.1016/S0070-4571(08)70841-0 Journal of Sedimentary Petrology Hamilton E.L. 280 46 1976 Variations of density and porosity with depth in deep-sea sediments HamiltonE.L. 1976. Variations of density and porosity with depth in deep-sea sediments. Journal of Sedimentary Petrology, 46, 280–300. 10.1130/0091-7613(1996)024<0127:SDATDO>2.3.CO;2 10.1126/science.aal3429 Soil Mechanics – Selected Topics Ingles O.G. 1 1968 InglesO.G. 1968. Soil chemistry relevant to the engineering behavior of soils. In: LeeI.K. (ed.) Soil Mechanics – Selected Topics. Elsevier, New York, 1–57. 10.1016/0040-1951(81)90110-4 The Journal of the Geological Society of Japan Kawamura K. 97 114 2008 Progressive change of microfabrics by compaction in superficial layers of ocean bottom sediments: examples from the Okinawa Trough KawamuraK. and KawamuraN. 2008. Progressive change of microfabrics by compaction in superficial layers of ocean bottom sediments: examples from the Okinawa Trough. The Journal of the Geological Society of Japan, 114 , 97–108, https://doi.org/10.5575/geosoc.114.97 [in Japanese with English abstract]. 10.2973/odp.proc.sr.185.003.2002 10.1016/j.margeo.2004.03.016 10.1007/978-3-540-79846-0_13 10.1007/978-94-011-0731-0 10.14379/iodp.proc.362.2017 McNeillL.C. DuganB. PetronotisK.E. and the Expedition 362 Scientists 2017. Sumatra Subduction Zone. Proceedings of the International Ocean Discovery Program 362: College Station TX (International Ocean Discovery Program) https://doi.org/10.14379/iodp.proc.362.103.2017 Proceedings of JAMSTEC Symposium Deep Sea Research Nishimura H. 49 9 1993 Microfabrics of deep-sea bottom sediment collected by Research Dive 134 of ‘Shinkai 6500’ NishimuraH., KawataT. and OgawaY. 1993. Microfabrics of deep-sea bottom sediment collected by Research Dive 134 of ‘Shinkai 6500’. Proceedings of JAMSTEC Symposium Deep Sea Research. Shinagawa, Tokyo, 9, 49–64. The Journal of Geological Society of Japan Takizawa S. 941 101 1995 A method of fixation and freeze-drying of soft sediments containing water TakizawaS., KawataT. and OhnoY. 1995. A method of fixation and freeze-drying of soft sediments containing water. The Journal of Geological Society of Japan, 101, 941–944, https://doi.org/10.5575/geosoc.101.941 [in Japanese with English abstract]. The Magnetic Anisotropy of Rocks Tarling D.H. 1993 TarlingD.H. and HroudaF. 1993. The Magnetic Anisotropy of Rocks. Chapman & Hall, London. 10.1029/2002JB002314