Sediment deformation and hydrogeology of the Nankai Trough accretionary prism: Synthesis of shipboard results of ODP Leg 131

Taira, Asahiko; Hill, Ian A.; Firth, J.V.; Berner, Ulrich; Brückmann, Warner; Byrne, Tim; Chabernaud, Thierry; Fisher, A. T.; Foucher, Jean-Paul; Gamo, Toshitaka; Gieskes, Joris M.; Hyndman, R. D.; Karig, Daniel E.; Kastner, Miriam; Kato, Y.; Lallemant, S.; Lu, Ran; Maltman, Alex; Moore, Gregory F.; Moran, K.; Olaffson, G.; Owens, William; Pickering, Kevin T.; Siena, Franca; Taylor, Elliott; Underwood, Michael B.; Wilkinson, CC; Yamano, Makoto; Zhang, J.

doi:10.1016/0012-821x(92)90104-4

Cited by 155 publications

(141 citation statements)

References 12 publications

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“…That is, the ultra-cataclasite and gouge are at the upper end, whilst the breccia zone and fracture zone are at the deeper end of the fault zone. The asymmetric architecture of the fault zone is also reported in the Nankai trough drilling (Taira et al 1992). Recently, studies based on numerical simulation showed that a wrinkling-like pulse could be the driving force in the development of asymmetric fault zones (Ben-Zion and Sammis 2003).…”

Section: Lithological Influence On the Development Of Fault Zonesmentioning

confidence: 84%

Core Description and Characteristics of Fault Zones from Hole-A of the Taiwan Chelungpu-Fault Drilling Project

Yeh¹,

Sone²,

Nakaya³

et al. 2007

Terr. Atmos. Ocean. Sci.

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Section: Lithological Influence On the Development Of Fault Zonesmentioning

confidence: 84%

Core Description and Characteristics of Fault Zones from Hole-A of the Taiwan Chelungpu-Fault Drilling Project

Yeh¹,

Sone²,

Nakaya³

et al. 2007

Terr. Atmos. Ocean. Sci.

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“…[6] The accretionary prism along the Kumano transect has a taper angle (decollement dip plus surface slope) of $6-16 within 40 km of the trench, which is much wider than along the Ashizuri ($5-8 ) and Muroto transect ($2-9 ) [Taira et al, 1992;Moore et al, 2001a;Kimura et al, 2007;Moore et al, 2009]. Due to the presence of a fossil spreading center, heat flow seaward of the trench on the Muroto transect is high (up to $200 mW/m 2 ) compared to the Ashizuri and Kumano transects ($100-130 mW/m 2 ) [Yamano et al, 1992;Yamano et al, 2003;Kinoshita et al, 2008].…”

Section: Nankai Trough Subduction Zonementioning

confidence: 99%

Shear strength of sediments approaching subduction in the Nankai Trough, Japan as constraints on forearc mechanics

Ikari

Hüpers

Kopf

2013

Geochem Geophys Geosyst

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[1] The mechanical behavior of the plate boundary fault zone is of paramount importance in subduction zones, because it controls megathrust earthquake nucleation and propagation as well as the structural style of the forearc. In the Nankai area along the NanTroSEIZE (Kumano) drilling transect offshore SW Japan, a heterogeneous sedimentary sequence overlying the oceanic crust enters the subduction zone. In order to predict how variations in lithology, and thus mechanical properties, affect the formation and evolution of the plate boundary fault, we conducted laboratory tests measuring the shear strengths of sediments approaching the trench covering each major lithological sedimentary unit. We observe that shear strength increases nonlinearly with depth, such that the (apparent) coefficient of friction decreases. In combination with a critical taper analysis, the results imply that the plate boundary position is located on the main frontal thrust. Further landward, the plate boundary is expected to step down into progressively lower stratigraphic units, assisted by moderately elevated pore pressures. As seismogenic depths are approached, the decollement may further step down to lower volcaniclastic or pelagic strata but this requires specific overpressure conditions. High-taper angle and elevated strengths in the toe region may be local features restricted to the Kumano transect.Components: 9,385 words, 7 figures.

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“…5). We suggest that this steady increase in chlorinity is a response to hydration reactions affecting dispersed volcanic ash and volcanic rock fragments (i.e., volcanic glass to smectite and zeolites) within Units IV and V. The trend of increasing chlorinity is unique with respect to other drilling sites on the Nankai trench floor and in the Shikoku Basin (including Site C0011), all of which show freshening at depth (Taira et al, 1992;Moore et al, 2001b) (Fig. 5).…”

Section: Principal Results From Site C0012mentioning

confidence: 74%

“…3). Lithologic Unit I was not cored, so its character is inferred from LWD data (Underwood et al, 2009) and by analogy with the upper part of the Shikoku Basin at ODP Sites 808, 1173, 1174, and 1177 (Taira et al, 1992;Moore et al, 2001b). The dominant lithology of this upper Shikoku Basin facies is hemipelagic mud (silty clay to clayey silt) with thin interbeds of volcanic ash (mostly air-fall tephra).…”

Section: Principal Results From Site C0011mentioning

confidence: 99%

“…Those studies demonstrated, among other things, that the plate-boundary fault (décollement) propagates through Miocene strata of the lower Shikoku Basin facies, at least near the toe of the accretionary prism (Taira et al, 1992;Moore et al, 2001b). One of the primary objectives of NanTroSEIZE is to track physical/chemical changes down the plate interface from shallow depths toward seismogenic depths, so the highest-priority sampling targets lie within the lower Shikoku Basin.…”

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confidence: 99%

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IODP Expedition 322 Drills Two Sites to Document Inputs to The Nankai Trough Subduction Zone

Underwood

Saito

Kubo

2010

Scientific Drilling

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The primary goals during Expedition 322 of the Integrated Ocean Drilling Program were to sample and log the incoming sedimentary strata and uppermost igneous basement of the Shikoku Basin, seaward of the Nankai Trough (southwestern Japan). Characterization of these subduction inputs is one piece of the overall science plan for the Nankai Trough Seismogenic Zone Experiment. Before we can assess how various material properties evolve down the dip of the plate interface, and potentially change the fault's behavior from stable sliding to seismogenic slip, we must determine the initial pre-subduction conditions. Two sites were drilled seaward of the trench to demonstrate how facies character and sedimentation rates responded to bathymetric architecture. Site C0011 is located on the northwest flank of a prominent basement high (Kashinosaki Knoll), and Site C0012 is located near the crest of the seamount. Even though significant gaps remain in the coring record, and attempts to recover wireline logs at Site C0012 failed, correlations can be made between stratigraphic units at the two sites. Sedimentation rates slowed down throughout the condensed section above the basement high, but the seafloor relief was never high enough during the basin's evolution to prevent the accumulation of sandy turbidites near the crest of the seamount. We discovered a new stratigraphic unit, the middle Shikoku Basin facies, which is typified by late Miocene volcaniclastic turbidites. The sediment-basalt contact was recovered intact at Site C0012, giving a minimum basement age of 18.9 Ma. Samples of interstitial water show a familiar freshening trend with depth at Site C0011, but chlorinity values at Site C0012 increase above the values for seawater toward the basement contact. The geochemical trends at Site C0012 are probably a response to hydration reactions in the volcaniclastic sediment and diffusional Science Reports

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Sediment deformation and hydrogeology of the Nankai Trough accretionary prism: Synthesis of shipboard results of ODP Leg 131

Cited by 155 publications

References 12 publications

Core Description and Characteristics of Fault Zones from Hole-A of the Taiwan Chelungpu-Fault Drilling Project

Core Description and Characteristics of Fault Zones from Hole-A of the Taiwan Chelungpu-Fault Drilling Project

Shear strength of sediments approaching subduction in the Nankai Trough, Japan as constraints on forearc mechanics

IODP Expedition 322 Drills Two Sites to Document Inputs to The Nankai Trough Subduction Zone

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