The latest Cretaceous‐Early Paleogene rapid growth of accretionary complex and exhumation of high pressure series metamorphic rocks in northwestern Pacific margin

Kimura, Gaku

doi:10.1029/94jb00959

Cited by 137 publications

(165 citation statements)

References 70 publications

(21 reference statements)

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“…This is due to the stabilizing effect of continuous sedimentation. Similar pulsed behavior has been inferred for some natural wedges (Byrne and Fisher, 1987;von Huene and Lallemand, 1990;Kimura, 1994;Underwood et al, 2003), though periods of rapid outward growth are normally thought to be associated with rapid sediment input (Mountney and Westbrook, 1996). These results imply that compressive plate margins cannot be classifi ed statically as accretionary versus erosive, but that the dominant character may change repeatedly through time.…”

Section: Discussionsupporting

confidence: 49%

Formation of accretionary prisms influenced by sediment subduction and supplied by sediments from adjacent continents

Simpson

2010

Geology

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Mechanical models are used to investigate the formation of accretionary prisms and related basins fed by sediments supplied from adjacent continents and subjected to sediment subduction. Results show that prisms forming under the infl uence of a hinterland sediment fl ux exhibit markedly different characteristics compared to classic critical wedges with identical mechanical properties forming by frontal accretion of a preexisting layer. The main differences are reduced surface slopes, increased spacing between thrusts, widespread wedgetop basins, and the presence of buried structures. These differences are explained by the ability of continuous sedimentation to reduce differential stresses in the wedge, leading to stable (supercritical) geometries. Thus, in regions of active sedimentation, wedge geometries cannot be explained solely in terms of relative strengths of the wedge and its décollement, as is the case for critical wedges. Results also show that variations in the relative rates of sediment supply (e.g., linked to climate changes) and sediment subduction may lead to pulsed growth and decline of wedges though time, as has been evidenced for some natural wedges. Thus, rather than viewing compressive plate margins as accretionary versus erosive, the dominant mode may repeatedly switch back and forth through time in response to variations in relative rates of sediment supply and sediment subduction.

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Section: Discussionsupporting

confidence: 49%

Formation of accretionary prisms influenced by sediment subduction and supplied by sediments from adjacent continents

Simpson

2010

Geology

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“…Local geology supports the suggestion for crustal thickening. Kimura (1994) demonstrated that the Kurile fore-arc has been colliding with the NE Japan arc since the Middle Miocene due to the migration to the southwest of the Kuril forearc sliver, forming an arc-arc type collision zone. High temperature metamorphic rocks of Tertiary age are exposed and include materials from the upper and lower crust (e.g., Shimura et al, 2004).…”

Section: Seismicity and Thermal Structure At The Trench Junctionmentioning

confidence: 99%

Thermal structure and intermediate-depth seismicity in the Tohoku-Hokkaido subduction zones

2012

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Abstract. The cause of intermediate-depth (> 40 km) seismicity in subduction zones is not well understood. The viability of proposed mechanisms, which include dehydration embrittlement, shear instabilities and the presence of fluids in general, depends significantly on local conditions, including pressure, temperature and composition. The wellinstrumented and well-studied subduction zone below Northern Japan (Tohoku and Hokkaido) provides an excellent testing ground to study the conditions under which intermediatedepth seismicity occurs. This study combines new finite element models that predict the dynamics and thermal structure of the Japan subduction system with a high-precision hypocenter data base. The upper plane of seismicity is principally contained in the crustal portion of the subducting slab and appears to thin and deepen within the crust at depths > 80 km. The disappearance of seismicity overlaps in most of the region with the predicted phase change of blueschist to hydrous eclogite, which forms a major dehydration front in the crust. The correlation between the thermally predicted blueschist-out boundary and the disappearance of seismicity breaks down in the transition from the northern Japan to Kurile arc below western Hokkaido. Adjusted models that take into account the seismically imaged modified upper mantle structure in this region fail to adequately recover the correlation that is seen below Tohoku and eastern Hokkaido. We conclude that the thermal structure below Western Hokkaido is significantly affected by timedependent, 3-D dynamics of the slab. This study generally supports the role of fluids in the generation of intermediatedepth seismicity.

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“…In the southern Hokkaido region of Japan, the Kuril arc has been colliding with the northeast Japan arc since middle Miocene [Kimura, 1994], resulting in the uplift of the Hidaka Mountains behind the Hidaka Main Thrust. Seismic tomographic and exploration studies confirm that the Kuril arc is obducted toward the west [Tsumura et al, 1999;Murai et al, 2003;Iwasaki et al, 2004].…”

Section: Hokkaidomentioning

confidence: 99%

Three‐dimensional crustal S wave velocity structure in Japan using microseismic data recorded by Hi‐net tiltmeters

2008

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[1] We developed a three-step method for three-dimensional (3-D) S wave velocity tomography by fitting synthetic cross spectra to the observed ones of ambient seismic noise. We applied this method to the recording of Hi-net tiltmeters in Japan at 679 stations from June 2004 to December 2004. First, we calculated normalized cross spectra between radial components and those between transverse components for every pair of stations. The first step is local 1-D S wave velocity inversion for each station assuming small lateral heterogeneity under a 100-km circle of a station. We measured the dispersion curves of fundamental Rayleigh waves, fundamental Love waves, and first overtone of Love waves by fitting the synthetic cross spectra to the observed ones between pairs of stations within the circle. We inverted the measured dispersion curves for obtaining a 1-D S wave velocity model. The second step is the inversion of the observed cross spectra for obtaining path-averaged 1-D S wave velocity structure. The third step is the inversion of the resultant path-averaged structures for obtaining 3-D S wave velocity structure (0.1°Â 0.1°Â 1 km grid from the surface to a depth of 50 km) using ray approximation. The resultant S wave velocity structures show clear low-velocity anomalies along tectonic lines from the surface to a depth of 20 km. In particular, along the Hidaka mountain range, we observed S wave perturbation more extreme than À20%. They also show low-velocity anomalies under volcanoes in Kyusyu and Tohoku. In the southwestern part of Shikoku, our results show a clear low-velocity anomaly corresponding to an accretional belt (Shimanto belt). Below 20 km, we observe a low-velocity anomaly in the center of Japan, which suggests a thick crust.Citation: Nishida, K., H. Kawakatsu, and K. Obara (2008), Three-dimensional crustal S wave velocity structure in Japan using microseismic data recorded by Hi-net tiltmeters,

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The latest Cretaceous‐Early Paleogene rapid growth of accretionary complex and exhumation of high pressure series metamorphic rocks in northwestern Pacific margin

Cited by 137 publications

References 70 publications

Formation of accretionary prisms influenced by sediment subduction and supplied by sediments from adjacent continents

Formation of accretionary prisms influenced by sediment subduction and supplied by sediments from adjacent continents

Thermal structure and intermediate-depth seismicity in the Tohoku-Hokkaido subduction zones

Three‐dimensional crustal S wave velocity structure in Japan using microseismic data recorded by Hi‐net tiltmeters

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