Deformation structures and magnetic fabrics at Site 1178; implication for deformation history recorded in accreted sediments at an evolved portion of the Nankai accretionary prism

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doi: 10.2973/odp.proc.sr.190196.202.2003
Author(s): Ujiie, Kohtaro; Hisamitsu, Toshio; Maltman, Alex J.; Morgan, Julia K.; Sánchez-Gómez, Mario; Tobin, Harold J.
Ocean Drilling Program, Leg 190, Shipboard Scientific Party, College Station, TX
Author Affiliation(s): Primary:
National Science Museum, Department of Geology, Yokohama, Japan
Other:
University of Tokyo, Japan
University of Wales Aberystwyth, United Kingdom
Rice University, United States
Universidad de Jaén, Spain
New Mexico Institute of Mining and Technology, United States
Volume Title: Proceedings of the Ocean Drilling Program; scientific results; deformation and fluid flow processes in the Nankai Trough accretionary prism; coring, logging while drilling and advanced CORKs covering Legs 190 to 196 of the cruises of the drilling vessel JOIDES Resolution; Sydney, Australia, to Yokohama, Japan, Sites 1173-1178, 23 May-16 July 2000; and Keelung, Taiwan, to Kochi, Japan, Sites 808-1173, 2 May-1 July 2001
Volume Author(s): Moore, Gregory F.; Taira, Asahiko; Klaus, Adam; Becker, Keir; Becker, Luann; Boeckel, Babette; Cragg, Barry A.; Dean, P. Allison; Fergusson, Christopher L.; Henry, Pierre; Hirano, Satoshi; Hisamitsu, Toshio; Hunze, Sabine; Kastner, Miriam; Maltman, Alex J.; Morgan, Julia K.; Murakami, Yuki; Saffer, Demian M.; Sánchez-Gómez, Mario; Screaton, Elizabeth J.; Smith, David C.; Spivack, Arthur J.; Steurer, Joan F.; Tobin, Harold J.; Ujiie, Kohtaro; Underwood, Michael B.; Wilson, Moyra E. J.; Mikada, Hitoshi; Moore, J. Casey; Austin, Gary L.; Bangs, Nathan L. B.; Bourlange, Sylvain; Broilliard, Julien; Brückmann, Warner; Corn, Ernest Ray; Davis, Earl E.; Flemings, Peter B.; Goldberg, David S.; Gulick, Sean P. S.; Hansen, Martin Bak; Hayward, Nathan; Hills, Denise J.; Ienaga, Masanori; Ishiguro, Hiroyasu; Kinoshita, Masataka; Macdonald, Robert D.; McNeill, Lisa; Obana, Shinichi; Hong, Ong Swee; Peacock, Sheila; Pettigrew, Thomas L.; Saito, Saneatsu; Sawa, Takao; Thaiprasert, Nophawit; Tsurumi, Hikaru
Source: Proceedings of the Ocean Drilling Program; scientific results; deformation and fluid flow processes in the Nankai Trough accretionary prism; coring, logging while drilling and advanced CORKs covering Legs 190 to 196 of the cruises of the drilling vessel JOIDES Resolution; Sydney, Australia, to Yokohama, Japan, Sites 1173-1178, 23 May-16 July 2000; and Keelung, Taiwan, to Kochi, Japan, Sites 808-1173, 2 May-1 July 2001, Gregory F. Moore, Asahiko Taira, Adam Klaus, Keir Becker, Luann Becker, Babette Boeckel, Barry A. Cragg, P. Allison Dean, Christopher L. Fergusson, Pierre Henry, Satoshi Hirano, Toshio Hisamitsu, Sabine Hunze, Miriam Kastner, Alex J. Maltman, Julia K. Morgan, Yuki Murakami, Demian M. Saffer, Mario Sánchez-Gómez, Elizabeth J. Screaton, David C. Smith, Arthur J. Spivack, Joan F. Steurer, Harold J. Tobin, Kohtaro Ujiie, Michael B. Underwood, Moyra E. J. Wilson, Hitoshi Mikada, J. Casey Moore, Gary L. Austin, Nathan L. B. Bangs, Sylvain Bourlange, Julien Broilliard, Warner Brückmann, Ernest Ray Corn, Earl E. Davis, Peter B. Flemings, David S. Goldberg, Sean P. S. Gulick, Martin Bak Hansen, Nathan Hayward, Denise J. Hills, Masanori Ienaga, Hiroyasu Ishiguro, Masataka Kinoshita, Robert D. Macdonald, Lisa McNeill, Shinichi Obana, Ong Swee Hong, Sheila Peacock, Thomas L. Pettigrew, Saneatsu Saito, Takao Sawa, Nophawit Thaiprasert and Hikaru Tsurumi; Ocean Drilling Program, Leg 190, Shipboard Scientific Party, College Station, TX; Ocean Drilling Program, Leg 196, Shipboard Scientific Party, College Station, TX. Proceedings of the Ocean Drilling Program, Scientific Results (CD ROM), Vol.190/196, 15p. Publisher: Texas A&M University, Ocean Drilling Program, College Station, TX, United States. ISSN: 1096-2514
Note: In English. Available only on CD-ROM in PDF format and on the Web in PDF or HTML. 20 refs.CD-ROM format, ISSN 1096-2514; WWW format, ISSN 1096-7451; illus., incl. sect., sketch map
Summary: During Leg 190, accreted sediments at an evolved portion of the Nankai accretionary prism were penetrated. Deformation structures and anisotropy of magnetic susceptibility (AMS) data from Site 1178 indicate that structural and magnetic fabrics formed at the frontal part of the prism have been preserved, even ∼65 km landward of the deformation front. As the sediments approached the deformation front, the bedding/fissility-parallel magnetic fabric took on a northeast-southwest-trending subhorizontal maximum AMS axis because of northwest-directed bedding-parallel compression. Subsequent faulting, represented by brecciated zones, took place at the frontal part of the accretionary prism, which is presumably equivalent to the imbricate thrusts in the prism. During this process, a steeply dipping bedding-oblique foliation developed in a fault zone, >100 m in thickness. The foliation was formed as a flattening plane associated with shearing deformation and alternates with brecciated zones, giving a geometric relationship similar to S-C or P-Y fabric. The magnetic fabric oriented parallel to the bedding-oblique foliation records pervasive strain related to faulting. Bedding and bedding-parallel magnetic fabric together with fissility were rotated about a horizontal axis during frontal accretion, resulting in a seaward-verging magnetic fabric with northeast-southwest-trending subhorizontal maximum AMS axes. Overprinting of the deformation and/or modification of preexisting fabrics during subsequent rapid seaward growth of the Nankai accretionary prism has not been recorded in the accreted sediments at Site 1178, suggesting that later penetrative deformation was not significant at shallow burial depths in the prism.
Year of Publication: 2005
Research Program: ODP Ocean Drilling Program
Key Words: 16 Structural Geology; Accretionary wedges; Algae; Anisotropy; Bedding; Biostratigraphy; Cenozoic; Deformation; Fabric; Faults; Leg 190; Lithostratigraphy; Magnetic properties; Magnetic susceptibility; Marine sediments; Microfossils; Microstructure; Nankai Trough; Nannofossils; Neogene; North Pacific; Northwest Pacific; ODP Site 1178; Ocean Drilling Program; Pacific Ocean; Paleomagnetism; Planar bedding structures; Plantae; Quaternary; Sedimentary structures; Sediments; Structural analysis; Tertiary; West Pacific
Coordinates: N324300 N324400 E1342900 E1342800
Record ID: 2005060945
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