NanTroSEIZE Stage 3: NanTroSEIZE Plate Boundary Deep Riser 2

Strasser, Michael; Dugan, Brandon; Kanagawa, Kyuichi; Moore, G. F.; Toczko, S.; Maeda, Lena; Kido, Yasumasa; Moe, Kyaw Thu; Yukitoshi, Sanada; Esteban, Lionel; Fabbri, Olivier; Geersen, Jacob; Hammerschmidt, Sven; Hayashi, Hiroki; Heirman, K.; Hüpers, Andre; Jurado, María José; Kameo, Koji; Kanamatsu, Toshiya; Kitajima, H.; Masuda, Harue; Milliken, Kitty L.; Mishra, Ravi; Motoyama, Isao; Olcott, K.; Oohashi, Kiyokazu; Pickering, KT; Ramirez, S.G.; Rashid, Harunur; Sawyer, Dale S.; Schleicher, Anja M.; Shan, Yehua; Skarbek, R.; Song, Insun; Takeshita, Toru; Toki, Takahiro; Tudge, J.; Webb, S.; Wilson, D.J.; Wu, H.-Y.; Yamaguchi, Asuka

doi:10.2204/iodp.proc.338.2014

Cited by 24 publications

(32 citation statements)

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“…In terms of lithology, breakouts occurred in both claystones (or shale) and sandstones. Figure 2e shows lithologic units identified based on cuttings analysis and other geological, geophysical, and geochemical characteristics [Strasser et al, 2014]. The borehole penetrated largely silty claystone formations; however, there are several depths where sandstones are also relatively rich.…”

Section: 1002/2016gc006562mentioning

confidence: 99%

Present‐day stress states underneath the Kumano basin to 2 km below seafloor based on borehole wall failures at IODP site C0002, Nankai accretionary wedge

Chang

Song

2016

Geochem Geophys Geosyst

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We constrain the state of stress to 2 km below seafloor in the Nankai accretionary prism at the Integrated Ocean Drilling Program (IODP) site C0002F, southwest Japan, based on borehole wall failures and rock strengths. The logging‐while‐drilling resistivity images from 872.5 to 2005.5 m below seafloor show that drilling‐mud control in riser drilling worked properly to minimize borehole wall failures. Available breakouts indicate a consistent maximum compression orientation subparallel to the subducting plate margin. Breakout analysis with drill logs suggests that breakouts occurred only when borehole pressure was slightly lowered and time lag between hole cutting and image logging was several hours. This indicates that the observed breakouts are not immediate stress‐induced failure but brought up into shape gradually with time due to other mechanisms. Laboratory investigations on deformation and failure of the cores suggest that the time‐delayed breakout might be a result of progressive rock spall‐out in borehole wall damage zones that occur at a stress level close to failure condition. We constrain stress magnitudes assuming that the stress state is sufficient to bring about the damage zones at the borehole wall. An integrated method utilizing breakouts, drilling‐induced tensile fractures, and a leak‐off test suggests that the stress states are on the boundary between strike‐slip faulting and normal faulting stress regimes, and somewhat variable depending on depth. The stress magnitudes in the accretionary wedge appear to be controlled by frictional strength of the rock, such that the differential stresses are constrained by the laboratory determined frictional coefficients.

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Section: 1002/2016gc006562mentioning

confidence: 99%

Present‐day stress states underneath the Kumano basin to 2 km below seafloor based on borehole wall failures at IODP site C0002, Nankai accretionary wedge

Chang

Song

2016

Geochem Geophys Geosyst

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“…Several holes have been drilled on the upper plate and the subducting plate of the subduction zone (Figures 1b and 1c). Site C0002, which is located along the seaward side of the Kumano basin and drilled via both non-riser drilling and riser drilling in multiple stages during Expeditions 314,315,326,338,and 348, contains a number of holes of different depths (e.g., Kinoshita et al, 2009;Moore et al, 2014;Strasser et al, 2013;Tobin et al, 2015).…”

Section: The Nankai Trough Subduction Zone and The Nantroseize Projectmentioning

confidence: 99%

“…During the International Ocean Discovery Program (IODP) Expeditions 338 and 348, where drilling occurred at Site C0002 down to 3,058.5 m below seafloor (mbsf), sampling of clay-rich rocks from the inner accretionary prism of the Nankai Trough took place (Strasser et al, 2013;Tobin et al, 2015). The prism, which is located south-east of Japan's island Honshu (Figure 1a), is characterized by an outer wedge comprising strongly deformed sediments with an aseismic décollement, and an inner wedge with rather ©2019.…”

Section: Introductionmentioning

confidence: 99%

Linking Faults, Fractures, and Clay Mineral Occurrence With Fluid Transport in the Accretionary Prism of the Nankai Trough, Japan

Schleicher

Jurado

2019

Geochem Geophys Geosyst

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The interpretation of logging while drilling resistivity oriented images and geophysical logs from Hole C0002 drilled during the International Ocean Discovery Program (IODP) Expeditions 338 and 348 of the Nankai Trough Seismogenic Zone Experiment (NanTroSEIZE) project revealed a complex structure of the accretionary prism characterized by steep bedding and abundant folds and fault zones, indicative of specific areas of deformation within the clay‐dominated prism sediments. Local faults were undoubtedly interpreted on images from Hole C0002P (2,162.5–3,058.4 m below seafloor), whereas folds were identified in both Holes C0002P and C0002F (860–2,005.5 m below seafloor). The clay mineral analysis of rock samples (cuttings) shows that clay mineralization occurs within the range of the faulted and fractured zones. This linkage between local deformation and clay mineralization can have implications for enhanced fluid flow and localized fluid‐rock interaction within the highly fractured areas of the accretionary prism. We conclude that dissolution and neomineralization of illitic and smectitic phases within fractures and faults is a process that probably continues during active creep and fault reactivation and plays a key role in influencing weak fault and creep behavior within the Nankai Trough, and likely in shallow fault systems elsewhere.

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“…Perfluorocarbon tracer data indicate that only Section 348-C0002P-2R-3 had appreciable contamination (~5%) by drilling fluid. Samples were processed to obtain pore water using the GRIND method as was used during Expedition 338 (Strasser et al, 2014a). Salinity and chlorinity alternate between high and low values downhole (Fig.…”

Section: Interstitial Water Analysesmentioning

confidence: 99%

“…NanTroSEIZE Stage 3 started with IODP Expedition 326, during which a 20 inch casing string was installed in Hole C0002F to 860 mbsf (Expedition 326 Scientists, 2011) and continued with Expedition 338 (Strasser et al, 2014a), during which it was originally planned to deepen Hole C0002F to 3600 mbsf. However, operations had to be aborted because of mechanical and weather-related events after drilling to ~2010 mbsf.…”

Section: Introductionmentioning

confidence: 99%

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2014

IODP Preliminary Report

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NanTroSEIZE Stage 3: NanTroSEIZE Plate Boundary Deep Riser 2

Cited by 24 publications

References 0 publications

Present‐day stress states underneath the Kumano basin to 2 km below seafloor based on borehole wall failures at IODP site C0002, Nankai accretionary wedge

Present‐day stress states underneath the Kumano basin to 2 km below seafloor based on borehole wall failures at IODP site C0002, Nankai accretionary wedge

Linking Faults, Fractures, and Clay Mineral Occurrence With Fluid Transport in the Accretionary Prism of the Nankai Trough, Japan

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