Legs 190 and 196 Synthesis: Deformation and Fluid Flow Processes in the Nankai Trough Accretionary Prism

Moore, G. F.; Mikada, H.; Moore, J. Casey; Becker, Keir; Taira, Asahiko

doi:10.2973/odp.proc.sr.190196.201.2005

Cited by 47 publications

(50 citation statements)

References 39 publications

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“…Similar trends were observed in paleomagneticallyreoriented fractures from nearby Site 1174 [Moore et al, 2001a].…”

Section: Nankai Accretionary Prism Deformation (808)supporting

confidence: 69%

“…[11] This zone is characterised by overall low resistivity, minor mottled higher resistivity zones (possible brecciation as in Leg 131 and 190 cores [Taira et al, 1991;Moore et al, 2001a]) and conductive fractures (Figure 2). The upper zone contact is ambiguous in RAB data relative to its clear equivalent in Leg 131 cores.…”

Section: Décollement Zonementioning

confidence: 99%

“…[3] Legs 131 and 190 [Taira et al, 1991;Moore et al, 2001a] drilled boreholes across the margin retrieving cores and wireline logs. Leg 196 drilled two of these sites, utilising state-of-the-art Logging While Drilling (LWD) to measure in situ physical properties [Mikada et al, 2002].…”

Section: Introductionmentioning

confidence: 99%

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Deformation and in situ stress in the Nankai Accretionary Prism from resistivity‐at‐bit images, ODP Leg 196

McNeill

Ienaga

Tobin

et al. 2004

Geophysical Research Letters

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Borehole resistivity images from ODP Leg 196 allow rapid and complete qualitative assessment of deformation within the toe of the Nankai prism, Japan. Borehole breakouts were common within the prism but prominent in the trench‐wedge unit around the frontal thrust, suggesting reduced sediment strength. Breakouts indicate consistent σ2 orientations (∼050°), compatible with northwesterly convergence. Deformation is dominated by discrete zones, including the frontal thrust and décollement zone. Prism fractures trend ∼NE–SW, consistent with convergence. The décollement shows minimal deformation and the dominant structural trend is ∼N–S. Prism deformation zones are characterized by high resistivity (compaction), whereas the décollement is apparently dilated, both with conductive fractures. Distribution of fracture orientations varies between log units confirming lithologic and rheologic influence. Pore pressure is elevated within the décollement and the misalignment of conductive fractures may reduce permeability.

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“…Similar trends were observed in paleomagneticallyreoriented fractures from nearby Site 1174 [Moore et al, 2001a].…”

Section: Nankai Accretionary Prism Deformation (808)supporting

confidence: 69%

Section: Décollement Zonementioning

confidence: 99%

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Deformation and in situ stress in the Nankai Accretionary Prism from resistivity‐at‐bit images, ODP Leg 196

McNeill

Ienaga

Tobin

et al. 2004

Geophysical Research Letters

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“…F1) numerous times over the past four decades Kagami, Karig, Coulbourn, et al, 1986;Shipboard Scientific Party, 1991;Shipboard Scientific Party, 2001;Moore et al, 2005). The Nankai Trough Seismogenic Zone Experiment (NanTroSEIZE) is the latest of those efforts Screaton et al, 2009;Underwood et al, 2010;Expedition 333 Scientists, 2012;Strasser et al, 2014a; see the "Expedition 348 summary" chapter [Tobin et al, 2015a]).…”

Section: Introductionmentioning

confidence: 99%

Data report: clay mineral assemblages and illite/smectite diagenesis in cuttings from Hole C0002P, IODP Expedition 348, Nankai Trough accretionary prism

Underwood¹

2017

Proceedings of the IODP

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This report summarizes the results of X-ray diffraction analyses of cuttings samples (1-4 mm diameter) from Integrated Ocean Drilling Program Hole C0002N, which is located offshore southwest Japan. The analyses included 73 specimens (<2 µm size fraction) from the upper to middle levels of the Nankai accretionary prism. The cuttings were collected over a depth interval of 1175 to 2305 meters below seafloor (mbsf). Smectite is generally the most abundant clay mineral. Within lithologic Unit IV, percentages of smectite in the bulk sediment average 25.5 wt% (standard deviation = 5.7), whereas values for illite and undifferentiated kaolinite + chlorite average 19.5 and 11.9 wt%, respectively (standard deviations = 2.3 and 1.9). Within lithologic Unit V, percentages of smectite in the bulk sediment decrease to an average of 21.4 wt% (standard deviation = 2.1); mean values of illite and kaolinite + chlorite are 21.6 and 14.9 wt%, respectively (standard deviations = 2.1 and 2.5). The expandability of illite/smectite averages 64%, and values decrease downsection. The average proportion of illite in illite/smectite mixed-layer clays is 35%, and values increase downsection. The illite crystallinity index shifts at approximately 1495 mbsf; values above are consistent with detrital sources that were exposed to advanced diagenesis and anchizone metamorphic conditions; values below are smaller (higher apparent crystallinity) due to an analytical artifact.

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“…Third, the region offshore the Kii Peninsula is generally typical of the Nankai margin in terms of heat flow and sediment on the incoming plate. This is in contrast to the area offshore Cape Muroto (the location of previous Deep Sea Drilling Project and Ocean Drilling Program [ODP] drilling) where both local stratigraphic variation associated with basement topography and anomalously high heat flow have been documented (Moore, Taira, Klaus, et al, 2001;Moore et al, 2005). Finally, the drilling targets are within the operational limits of riser drilling by Chikyu (i.e., maximum of 2500 m water depth and 7000 m subseafloor penetration).…”

Section: Geological Settingmentioning

confidence: 89%

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Araki¹,

Byrne²,

McNeill³

et al. 2009

IODP Scientific Prospectus

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The Nankai Trough Seismogenic Zone Experiment (NanTroSEIZE) program is a coordinated, multiexpedition drilling project designed to investigate fault mechanics and seismogenesis along subduction megathrusts through direct sampling, in situ measurements, and long-term monitoring in conjunction with allied laboratory and numerical modeling studies. The fundamental scientific objectives of the NanTroSEIZE drilling project include characterizing the nature of fault slip and strain accumulation, fault and wall rock composition, fault architecture, and state variables throughout the active plate boundary system. The primary goals for Integrated Ocean Drilling Program (IODP) Expedition 319 are riser drilling, analyses of cuttings and limited cores, logging, and casing at proposed Site NT2-11B (or alternate proposed Site NT2-11A) and riserless drilling, logging while drilling (LWD), and casing at proposed Site NT2-01J (or alternate proposed Site NT2-01K). Operations at both sites will include placing a wellhead and drilling and casing to the target depth in preparation for installation of monitoring equipment planned for future expeditions. This Scientific Prospectus outlines the scientific rationale, objectives, and operational plans for drilling these two sites.Proposed Site NT2-11B is a riser drilling site located in the Kumano forearc basin in the upper plate above the seismogenic and presumed locked portion of the plate boundary thrust system. During this expedition, proposed Site NT2-11B will be drilled to 1600 meters below seafloor (mbsf) to (1) determine the composition, physical properties, and stratigraphy of the basin sediments, (2) conduct downhole measurements to determine stress magnitude and orientation and pore pressure magnitudes, (3) install casing in preparation for a riser observatory, and (4) acquire data from a two-ship vertical seismic profile experiment to characterize the rock volume surrounding and below the borehole, including the subduction thrust at a depth of ~10 km. The observatory (planned for installation in 2010 or 2011) will monitor seismicity, volumetric strain, tilt, pore pressure, and temperature, with the goals of characterizing strain accumulation and release, microseismicity, hydrologic transients associated with strain events, and ambient pore pressure and temperature. Proposed Site NT2-01J is a riserless drilling site located 3.5 km along strike of previously drilled and cored IODP Site C0004 and will penetrate a major splay fault ("megasplay") at ~410 mbsf. The objectives at this site are to (1) collect measurement while drilling (MWD) and LWD data that will complement LWD and core data collected during IODP Expeditions 314 and 316 at Site C0004, (2) install casing in preparation for installation of an observatory (planned for 2010 or 2011) that will cross the fault Expedition 319 Scientific Prospectus 4 zone and extend into the footwall, and (3) install a temporary instrument package that will monitor pore pressure and temperature within a screened interval spanning th...

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Legs 190 and 196 Synthesis: Deformation and Fluid Flow Processes in the Nankai Trough Accretionary Prism

Cited by 47 publications

References 39 publications

Deformation and in situ stress in the Nankai Accretionary Prism from resistivity‐at‐bit images, ODP Leg 196

Deformation and in situ stress in the Nankai Accretionary Prism from resistivity‐at‐bit images, ODP Leg 196

Data report: clay mineral assemblages and illite/smectite diagenesis in cuttings from Hole C0002P, IODP Expedition 348, Nankai Trough accretionary prism

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