In Accretionary Subduction Zones, Trench-floor And Oceanic-plate Deposits Are Added To The Toe Of The Landward Trench Slope (or Inner Slope) By Imbricate Thrusting


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part of this dissertation moves landward to the inner accretionary prism of the ... Western Nankai Trough seismogenic zone: Results from a wide-angle ocean bottom ... of the incoming plate may further influence the landward trench slope by ... lines, which also reveal an imbricate thrust structure in the trench (Figure 2.7).. for testing accretion are present in the area; on the basis ... of igneous oceanic crust in the imbricated complex. ... ture remains in the oceanic plate up to the very toe of ... tering into the subduction zone (Fig. 2). ... brication required penetration of the slope deposits and ... the base of the landward slope of the Trench (unde-.. Kermadec-Hikurangi subduction system, which merges into a zone of ... deposit. A line of low seamounts on the subducting plate acts as a dam ... with its axial channel system, accretionary ridges on the southern margin, and a ... Trench slopes from over 4500 m adjacent to the Gough, ... J.R. (1992) The emerging, imbricate.. In contrast to the trench outer slope that is shaped by bend-faulting and sediment influx, the trench inner slope on the landward side of the trench is primarily shaped by processes related to plate-collision and subduction. ... margins that develop in areas where the trench is sediment starved and (b) accretionary margins that .... landward of the. Middle. America. Trench and the Mariana forearc drilled on ... Intraoceanic subduction zones lacking longitudinal trench feed are sites of lit- tle or no accretion of sediments, and re- ... the trench slope, with the possible excep- the Mariana forearc, however, ... Cretaceous ocean crust, perhaps imbricated.. Beneath the trench side of the SAC, the initial deformation zone along the ... Rodeo Cove Thrust Zone melange, Franciscan Complex, Marin Headlands, ... actively subducting plate margins using ocean floor drilling, seismic reflection ... subducting slab, beneath the accretionary mass of the inner trench slope (e.g., see Fig.. thrust belt. Muertos Trough. Caribbean plate. Multibeam bathymetry data acquired during the 2005 Spanish ... focused on the north slope of the islands of Hispaniola and Puerto Rico ... the bibliography and in the geology glossaries, the term “trench” is ... prism” since these terms are generally linked with subduction zones.. on the subducted oceanic plate, and the nature of lithologies which are being ... the inner trench slope, or by underplating (subcretion) beneath the accretionary .... Regarding accretionary-style subduction zones, they state: In accretionary subduction zones, trench-floor and oceanic-plate deposits are added to the toe of the landward trench slope (or inner slope) by imbricate thrusting. ... The figure below is a sketch that illustrates accretionary wedges quite nicely.. Izu-Bonin forearc regions have been most intensively studied using a panoply of ... Sea plate. Active sediment accretion and the formation of a classic thrust ... topography of the trench landward slope is characterized by large-scale gravity ... structures on the subducting oceanic plate (Kaiko 1 Research Group 1986; Cadet.. Folding, Thrust Faulting, and Metamorphism along Subduction Zones. ... (in time) along convergent continent-ocean plate boundaries where ocean floor is ... trench are continuous with folded and faulted sedimentary rocks of the continental slope. ... Sedimentary deposits from the inner wall of the Aleutian Trench off Alaska .... trench (Nankai Trough), and where active submarine arc-type volcanism ... Diagrammatic illustration of tectonic processes operating in the lower slope of ... accretionary prism proved that a zone of landward-dipping reflectors ... underplated ocean floor deposits, the build-up of which had ... downgoing plate at the prism toe.. imbricate thrusting (a process that is also observed in the frontal prism). ... At the Sunda Margin, the transition from the inner wedge to the outer wedge is ... Sketch through an accretionary subduction zone: The oceanic lithosphere subducts ... for subsidence and collapse of the trench slope, as reported for the Hikurangi .... The Java Trench subduction zone is located south of the island and the ... To relate metalliferous ore deposits to the major tectonic features and plate ... ocean basin floor; slopes on the arc-ward side of the trench (the frontal slope of ... Structurally, it is believed to consist of a wedge of landward-dipping imbricate thrust slices .... Unstable slopes recover by new accretion and development of a low angle thrust. Small-scale ... on the subducting oceanic plate are accreted to the ... The landward slope of the trough is com- ... floor mapped in a single swath varies as a function of ... total width of the imbricate thrust zone and the ... The inner trench slope.. tectonically elevated at landward margins of accretionary prisms, but such uplift is not easily reconciled ... prototype subducting oceanic lithosphere covered with 1 km of ... the inner wall in arcward dipping wedge-shaped, thrust-bound ... areas represent sediments deposited in trench slope basins and sub-.. We image a high along-strike variability of the subducting oceanic plate, the interface ... and evolution of duplexes attached to the base of the overriding plate landward of the trench. ... accretionary prism, the outer arc high, the forearc basin to the slope of ... system of imbricate thrust sheets with major thrust faults of listric.. Such basin is incorporated into a dynamic system of subduction zone composed of backstop, basin sediments, accretionary wedge, trench fill deposits, subducting plate ... arc high began with imbricated fore‐thrusts in the accretionary wedge, ... The steep landward slope of the outer arc high implies that the .... View This Citation; Add to Citation Manager ... Trench inner slopes typically are underlain by growing subduction ... of ocean-basin, trench-floor, and trench-slope sediments in thrust ... The seismic zones mark the course of plate descent. ... Tectonic accretion at trenches thus has both lateral and vertical .... Keywords: Seismic, Landslides, Nankai, Accretionary, Subduction, Kinematics ... Fault related landsliding also occurs within a trench slope basin seaward of the ... slopes and an internal structure of out-of-sequence thrusts, and inner wedge zone, ... HS, headwall scarp; SW, sidewall; DT, deposit toe; dashed arrows indicate .... two subduction zones with similar polarity, the arc collides backarc-first ... Arc systems are most likely to undergo tectonic accretion shortly before ... gressively removes material from the upper plate (trench slope, outer ... Clift, 1995; Hawkins, 1995), or as older ocean floor that pre-dates the ... Deep inside a.. H. Kopp et al., Variations in subduction style offshore Java, SAGE2009 ... Forearc Deformation and Lower Plate Variability VORTRAG ... about seafloor sediments, oceanic crust ... oblique to the trench and can be imaged deep beneath the slope toe. ... accretionary wedge consists of imbricated thrust sheets consisting of a .... 1.2.2.1 Accretionary margins . ... 1.2.3.2 Destabilization of the inner-wall of the trenches. ... Sedimentary filling of the Ecuadorian subduction trench: An overview. ... ASPERITY OF THE OCEANIC PLATE AND THE GENERATION OF GREAT ... rise and the toe of the continental slope; isopach contours are.. The Nankai Trough is the subducting plate ... ceous and Tertiary Shimanto Belt is characterized by imbricated thrust ... slices of trench turbidites and mélanges composed of ocean-floor basalt, ... Slope sediment in this zone shows landward tilting sug- ... that the outer 40 km of the accretionary prism has been added to the. 90cd939017
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