Geochemistry, Geophysics, Geosystems


  1. Regular Articles

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    2. Regular Articles
    3. Research Articles
    1. Velocity-porosity relationships in smectite-rich sediments: Shikoku Basin, Japan (pages 5194–5207)

      Joanne Tudge and Harold J. Tobin

      Article first published online: 20 DEC 2013 | DOI: 10.1002/2013GC004974

      Key Points

      • Smectite-corrected core porosity measurements significantly decrease porosity
      • New velocity-porosity relationship is presented using corrected data
    2. Strong sediments at the deformation front, and weak sediments at the rear of the Nankai accretionary prism, revealed by triaxial deformation experiments (pages 4791–4810)

      Michael Stipp, Malte Rolfs, Yujin Kitamura, Jan H. Behrmann, Kai Schumann, Detlef Schulte-Kortnack and Volker Feeser

      Article first published online: 8 NOV 2013 | DOI: 10.1002/ggge.20290

      Key Points

      • Triaxial deformation experiments on Nankai accretionary prism sediments
      • Structurally weak and strong samples depending on their tectonic position
      • Strength contrast due to variations in deformation and consolidation state
    3. Shear strength of sediments approaching subduction in the Nankai Trough, Japan as constraints on forearc mechanics (pages 2716–2730)

      Matt J. Ikari, Andre Hüpers and Achim J. Kopf

      Article first published online: 6 AUG 2013 | DOI: 10.1002/ggge.20156

      Key Points

      • Nankai plate boundary and wedge strengths are constrained
      • Plate boundary fault migrates to lower strata with distance from the trench
      • Strength variations generally but not always explained by sediment composition
  2. Research Articles

    1. Top of page
    2. Regular Articles
    3. Research Articles
    1. Large volume submarine ignimbrites in the Shikoku Basin: An example for explosive volcanism in the Western Pacific during the Late Miocene (pages 1837–1851)

      Steffen Kutterolf, Julie C. Schindlbeck, Rachel P. Scudder, Richard W. Murray, Kevin T. Pickering, Armin Freundt, Shasa Labanieh, Ken Heydolph, Sanny Saito, Hajime Naruse, Michael B. Underwood and Huaichun Wu

      Article first published online: 27 MAY 2014 | DOI: 10.1002/2014GC005263

      Key Points

      • Two volcanic sources for Miocene Expedition 322 tuffaceous sandstones
      • Large eruptions produced wide and voluminous deposits within the Shikoku Basin
      • Tuffaceous sands on Philippine Plate potentially influence Nankai subduction
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      Mechanical and hydraulic properties of Nankai accretionary prism sediments: Effect of stress path

      Hiroko Kitajima, Frederick M. Chester and Giovanna Biscontin

      Article first published online: 30 OCT 2012 | DOI: 10.1029/2012GC004124

      Key Points

      • The tested prism sediments are overconsolidated and likely to deform brittle
      • Yield envelope of prism sediments are well described by Cam-Clay model
      • Hydraulic properties depend on both effective mean and differential stresses
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      Effect of smectite dehydration on pore water geochemistry in the shallow subduction zone: An experimental approach

      A. Hüpers and A. J. Kopf

      Article first published online: 25 OCT 2012 | DOI: 10.1029/2012GC004212

      Key Points

      • We quantified smectite dehydration as a function of effective stress
      • Stress-dependent dehydration can be an imporant fluid source in subduction zones
      • Stress driven dehydration affects pore water geochemistry in experiments
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      High fluid pressures and high fluid flow rates in the Megasplay Fault Zone, NanTroSEIZE Kumano Transect, SW Japan

      J. Casey Moore, Myles Barrett and Moe Kyaw Thu

      Article first published online: 16 AUG 2012 | DOI: 10.1029/2012GC004181

      Key Points

      • Annular pressure while drilling identifies high fluid flow rates
      • Fracture zones, high flow rates correlate with bright reflectors
      • Megasplay fault zones locally have high fluid flow rates
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      Sources and physicochemical characteristics of fluids along a subduction-zone megathrust: A geochemical approach using syn-tectonic mineral veins in the Mugi mélange, Shimanto accretionary complex

      Asuka Yamaguchi, Kohtaro Ujiie, Shun'ichi Nakai and Gaku Kimura

      Article first published online: 12 JUL 2012 | DOI: 10.1029/2012GC004137

      Key Points

      • C, O, and Sr isotopes and REE analyses on veins in ancient subduction megathrust
      • Vein fluid source is strongly affected by rock-buffered fluid
      • REE patterns reflect physicochemical processes in fault zone
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      Coupled fluid flow and deformation modeling of the frontal thrust region of the Kumano Basin transect, Japan: Implications for fluid pressures and decollement downstepping

      Katherine T. Rowe, Elizabeth J. Screaton and Shemin Ge

      Article first published online: 7 MAR 2012 | DOI: 10.1029/2011GC003861

      Key Points

      • High excess pore pressures may build beneath the NanTroSEIZE frontal thrust
      • Shear is an important contributor to footwall excess pore pressure
      • Variations in sediment properties and fault friction may shift fault location
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      Pliocene shortening direction in Nankai Trough off Kumano, southwest Japan, Sites IODP C0001 and C0002, Expedition 315: Anisotropy of magnetic susceptibility analysis for paleostress

      Toshiya Kanamatsu, Josep M. Parés and Yujin Kitamura

      Article first published online: 19 JAN 2012 | DOI: 10.1029/2011GC003782

      Key Points

      • Magnetic fabrics of accretionary prism units were measured
      • They show NW–SE shortening directions
      • The directions agree with the direction of past plate subduction
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      Thermal effects of hydrothermal circulation and seamount subduction: Temperatures in the Nankai Trough Seismogenic Zone Experiment transect, Japan

      G. A. Spinelli and R. N. Harris

      Article first published online: 10 DEC 2011 | DOI: 10.1029/2011GC003727

      Key Points

      • Seamount subduction may change ocean crust hydrogeology and decollement position
      • Fluid circulation in the NanTroSEIZE area reduces subduction zone temperatures
      • Subduction of all sediment in wake of a seamount lowers margin toe temperatures
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      Heat flow distribution and thermal structure of the Nankai subduction zone off the Kii Peninsula

      Hideki Hamamoto, Makoto Yamano, Shusaku Goto, Masataka Kinoshita, Keiko Fujino and Kelin Wang

      Article first published online: 7 OCT 2011 | DOI: 10.1029/2011GC003623

      Key Points

      • Detailed heat flow surveys were carried out in the Nankai subduction zone
      • Subsurface thermal structure was calculated based on the obtained heat flow data
      • Frictional heating along the subduction plate interface is estimated to be small
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      In situ stress state from walkaround VSP anisotropy in the Kumano basin southeast of the Kii Peninsula, Japan

      Takeshi Tsuji, Ryota Hino, Yoshinori Sanada, Kiyohiko Yamamoto, Jin-Oh Park, Tetsuo No, Eiichiro Araki, Nathan Bangs, Roland von Huene, Gregory Moore and Masataka Kinoshita

      Article first published online: 22 SEP 2011 | DOI: 10.1029/2011GC003583

      Key Points

      • Seismic anisotropy is estimated from walkaround VSP data at Site C0009
      • Maximum horizontal stress orientation is aligned with subduction direction
      • The maximum horizontal stress is similar in magnitude to the vertical stress
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      Heat flow estimated from BSR and IODP borehole data: Implication of recent uplift and erosion of the imbricate thrust zone in the Nankai Trough off Kumano

      Masataka Kinoshita, Gregory F. Moore and Yukari N. Kido

      Article first published online: 21 SEP 2011 | DOI: 10.1029/2011GC003609

      Key Points

      • Heat flow was determined in Nankai fore-arc slope off Kumano from BSR
      • BSRs are discontinuous or overlapping across imbricate thrusts
      • It is the transient effect of thrusting followed by uplift and subsidence
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      Mechanical characterization of slope sediments: Constraints on in situ stress and pore pressure near the tip of the megasplay fault in the Nankai accretionary complex

      Insun Song, Demian M. Saffer and Peter B. Flemings

      Article first published online: 25 AUG 2011 | DOI: 10.1029/2011GC003556

      Key Points

      • Experimental work for mechanical characterization of marine sediments
      • Interpretation of wellbore failure with our results for estimating in situ stress
      • Providing mechanical explanation of stress history around the megasplay zone
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      Heat flow along the NanTroSEIZE transect: Results from IODP Expeditions 315 and 316 offshore the Kii Peninsula, Japan

      Robert N. Harris, Friederike Schmidt-Schierhorn and Glenn Spinelli

      Article first published online: 23 AUG 2011 | DOI: 10.1029/2011GC003593

      Key Points

      • Thermal conductivity increases with depth and correlates with porosity
      • Heat flow generally decreases with landward distance from the deformation front
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      Thermal conductivities under high pressure in core samples from IODP NanTroSEIZE drilling site C0001

      Weiren Lin, Osamu Tadai, Takehiro Hirose, Wataru Tanikawa, Manabu Takahashi, Hideki Mukoyoshi and Masataka Kinoshita

      Article first published online: 24 JUN 2011 | DOI: 10.1029/2010GC003449

      Key Points

      • Address pressure effect on thermal conductivity of NanTroSEIZE site C0001 cores
      • Quantitatively estimate possible error of TC measurement at atmospheric pressure
      • Developed testing technique for the coming NanTroSEIZE ultradeep drilling
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      Slumping and mass transport deposition in the Nankai fore arc: Evidence from IODP drilling and 3-D reflection seismic data

      Michael Strasser, Gregory F. Moore, Gaku Kimura, Achim J. Kopf, Michael B. Underwood, Junhua Guo and Elizabeth J. Screaton

      Article first published online: 11 MAY 2011 | DOI: 10.1029/2010GC003431

      Key Points

      • We document Nankai fore arc submarine slide history spanning >2 million years
      • Intensified sliding coincided with pulses of enhanced tectonic activity
      • Structural evolution exerts the key role over size and frequency of MTDs
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      Structural restoration of thrusts at the toe of the Nankai Trough accretionary prism off Shikoku Island, Japan: Implications for dewatering processes

      Gregory F. Moore, Demian Saffer, Melody Studer and Patrizia Costa Pisani

      Article first published online: 11 MAY 2011 | DOI: 10.1029/2010GC003453

      Key Points

      • Horizontal shortening at the toe of the Nankai prism is ∼40%
      • 60%–75% of the total horizontal shortening is accommodated by porosity loss
      • Dewatering rates are highest in the outermost ∼2–4 km of the accretionary prism
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      Comparison of frictional strength and velocity dependence between fault zones in the Nankai accretionary complex

      Matt J. Ikari and Demian M. Saffer

      Article first published online: 26 APR 2011 | DOI: 10.1029/2010GC003442

      Key Points

      • All three fault zones are clay rich, weak, and velocity strengthening
      • Shallow fault zones have a propensity for slow slip
      • Frictional strength differences can explain differences in prism structure
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      Acoustic and mechanical properties of Nankai accretionary prism core samples

      Hugues Raimbourg, Yozo Hamano, Saneatsu Saito, Masataka Kinoshita and Achim Kopf

      Article first published online: 7 APR 2011 | DOI: 10.1029/2010GC003169

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      Growth of borehole breakouts with time after drilling: Implications for state of stress, NanTroSEIZE transect, SW Japan

      J. Casey Moore, Chandong Chang, Lisa McNeill, Moe Kyaw Thu, Yasuhiro Yamada and Gary Huftile

      Article first published online: 5 APR 2011 | DOI: 10.1029/2010GC003417

      Key Points

      • Breakouts widen over hours to days after initial imaging minutes after drilling
      • Underestimated width equals underestimated stress magnitudes
      • Underestimated stress magnitude can under predict tendency for thrust faulting
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      Spatial and temporal evolution of the megasplay fault in the Nankai Trough

      Gaku Kimura, Gregory F. Moore, Michael Strasser, Elizabeth Screaton, Daniel Curewitz, Carolyn Streiff and Harold Tobin

      Article first published online: 23 MAR 2011 | DOI: 10.1029/2010GC003335

      Key Points

      • Three-dimensional structure of the splay fault was revealed in the Nankai Trough
      • Recent activity of the splay fault depends on the location and the geometry
      • A seamount collision controlled the spatial and temporal evolution of the fault
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      Quantification of free gas in the Kumano fore-arc basin detected from borehole physical properties: IODP NanTroSEIZE drilling Site C0009

      Mai-Linh Doan, Marianne Conin, Pierre Henry, Thomas Wiersberg, David Boutt, David Buchs, Demian Saffer, Lisa C. McNeill, Deniz Cukur and Weiren Lin

      Article first published online: 28 JAN 2011 | DOI: 10.1029/2010GC003284

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      In situ stress state in the Nankai accretionary wedge estimated from borehole wall failures

      Chandong Chang, Lisa C. McNeill, J. Casey Moore, Weiren Lin, Marianne Conin and Yasuhiro Yamada

      Article first published online: 16 DEC 2010 | DOI: 10.1029/2010GC003261

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      Pore fluid chemistry of the North Anatolian Fault Zone in the Sea of Marmara: A diversity of sources and processes

      M. D. Tryon, P. Henry, M. N. Çağatay, T. A. C. Zitter, L. Géli, L. Gasperini, P. Burnard, S. Bourlange and C. Grall

      Article first published online: 29 OCT 2010 | DOI: 10.1029/2010GC003177

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      Possible strain partitioning structure between the Kumano fore-arc basin and the slope of the Nankai Trough accretionary prism

      Kylara M. Martin, Sean P. S. Gulick, Nathan L. B. Bangs, Gregory F. Moore, Juichiro Ashi, Jin-Oh Park, Shin'ichi Kuramoto and Asahiko Taira

      Article first published online: 21 MAY 2010 | DOI: 10.1029/2009GC002668

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      Interactions between deformation and fluids in the frontal thrust region of the NanTroSEIZE transect offshore the Kii Peninsula, Japan: Results from IODP Expedition 316 Sites C0006 and C0007

      E. Screaton, G. Kimura, D. Curewitz, G. Moore, F. Chester, O. Fabbri, C. Fergusson, F. Girault, D. Goldsby, R. Harris, F. Inagaki, T. Jiang, Y. Kitamura, M. Knuth, C.-F. Li, L. Claesson Liljedahl, L. Louis, K. Milliken, U. Nicholson, N. Riedinger, A. Sakaguchi, E. Solomon, M. Strasser, X. Su, A. Tsutsumi, A. Yamaguchi, K. Ujiee and X. Zhao

      Article first published online: 29 DEC 2009 | DOI: 10.1029/2009GC002713

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