An empirical relationship between velocity and porosity for underthrust sediments in the Nankai Trough accretionary prism

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doi: 10.2973/odp.proc.sr.190196.355.2004
Author(s): Hoffman, Nicole W.; Tobin, Harold J.
Ocean Drilling Program, Leg 190, Shipboard Scientific Party, College Station, TX
Author Affiliation(s): Primary:
New Mexico Institute of Mining and Technology, Department of Earth and Environmental Science, Socorro, NM, United States
Other:
University of Tokyo, Japan
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, 23p. 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. 27 refs.CD-ROM format, ISSN 1096-2514; WWW format, ISSN 1096-7451; illus., incl. sect., strat. col., 1 table, sketch map
Summary: An empirical relationship between compressional wave velocity and porosity was developed for underthrust sediments in the Shikoku Basin of the Nankai accretionary prism. Shipboard core and logging measurements of velocity and porosity from Ocean Drilling Program Legs 131, 190, and 196 were used to define a new velocity-porosity transform based on an existing formulation. The new transform includes a critical porosity transition. Corrections were calculated and applied to shipboard core measurements to account for unloading from in situ conditions. The results from the velocity-porosity transform indicate the Shikoku Basin sediments follow a normal consolidation curve. A critical porosity transition is crossed at a fractional porosity of ∼0.30 between the protothrust and frontal thrust zones of the accretionary prism. Although an accurate critical porosity transition was fit to these data, the critical porosity transition occurs over a range of porosity. The Shikoku Basin formulation represents a significant improvement over previous velocity-porosity formulations.
Year of Publication: 2005
Research Program: ODP Ocean Drilling Program
Key Words: 16 Structural Geology; Accretionary wedges; Decollement; Leg 190; Leg 196; Marine sediments; Nankai Trough; North Pacific; Northwest Pacific; Ocean Drilling Program; Pacific Ocean; Porosity; Sedimentary rocks; Sediments; Shikoku Basin; Tectonics; Velocity; West Pacific
Coordinates: N320000 N340000 E1360000 E1320000
Record ID: 2005060947
Copyright Information: GeoRef, Copyright 2019 American Geosciences Institute.