Geomorphological development of the Goto Submarine Canyon, northeastern East China Sea

Oiwane, Hisashi; Tonai, Satoshi; Kiyokawa, Shoichi; Nakamura, Yasuyuki; Suganuma, Yûsuke; Tokuyama, Hidekazu

doi:10.1016/j.margeo.2011.06.013

Cited by 21 publications

(9 citation statements)

References 33 publications

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“…12A). Analogous submarine canyons exist today along the northern margin of Okinawa Trough (Zhao et al, 2008;Oiwane et al, 2011;Wu et al, 2014). We suggest that comparable systems incised and remained active during incipient subduction of the Philippine Sea plate, extending sedimentsupply routes across what is now the Ryukyu arc-trench system (Fig.…”

Section: Provenance and Dispersal Of Sand Bodies In Shikoku Basinsupporting

confidence: 57%

Facies architecture, detrital provenance, and tectonic modulation of sedimentation in the Shikoku Basin: Inputs to the Nankai Trough subduction zone

Underwood¹,

Pickering²

2018

Geology and Tectonics of Subduction Zones: A Tribute to Gaku Kimura

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The Shikoku Basin is a back-arc basin located offshore southwest Japan. Sediments within the basin make up a key part of the subduction inputs to the Nankai Trough. A 19 m.y. history of sedimentation has been documented at Sites C0011 and C0012 of the Integrated Ocean Drilling Program (Kumano transect) and Sites 1173 and 1177 of the Ocean Drilling Program (Muroto and Ashizuri transects, respectively). This paper focuses on three noteworthy aspects of that history: (1) the onset of substantial pyroclastic influx, which shifted significantly along the strike length of the margin, from 3.3-3.9 Ma at Sites 1177 and 1173 to 7.6-7.8 Ma at Sites C0011 and C0012; (2) transport of sand by sediment gravity flows, which resulted in three discrete sand bodies during the Miocene (Kyushu, Daiichi Zenisu, and Daini Zenisu submarine fans); and (3) clay mineral assemblages within hemipelagic mudstones, which show systematic reduction of 3 wt% detrital smectite per 1 m.y. decrease in age. Collectively, these temporal and spatial adjustments of lithofacies and sediment composition have important implications for downdip and along-strike projections of frictional, geotechnical, and hydrogeological properties as strata enter the Nankai subduction zone. The stratigraphic positions of smectite-rich Miocene mudstones, for example, should match up with increases in the volume of fluid production by clay dehydration during subduction. The higher-permeability sand bodies (Kyushu and Zenisu submarine fans) should act as preferred conduits for focused fluid flow. The potential for buildup of fluid overpressures should increase above and laterally adjacent to stratigraphic pinchouts of sand bodies, especially where the aquifers are inclined or confined between basement highs. These three-dimensional complexities set the Nankai-Shikoku system apart from other subduction zones (e.g., Japan Trench, Costa Rica) where inputs consist of comparatively homogeneous pelagic and hemipelagic deposits.

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Section: Provenance and Dispersal Of Sand Bodies In Shikoku Basinsupporting

confidence: 57%

Facies architecture, detrital provenance, and tectonic modulation of sedimentation in the Shikoku Basin: Inputs to the Nankai Trough subduction zone

Underwood¹,

Pickering²

2018

Geology and Tectonics of Subduction Zones: A Tribute to Gaku Kimura

View full text Add to dashboard Cite

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“…A transport route through the East China Sea is supported by the presence of a very large and long‐lived sediment drainage system immediately west of Kyushu that includes extensive submarine canyons [ Oiwane et al ., , Figure ]. At that time, the Okinawa Trough (Figure e) would not have blocked sediment delivery into the Shikoku Basin because that bathymetric obstacle did not form until 4–6 Ma [cf.…”

Section: Implications For Bathymetry Of Nankai Trough and Tectonic‐stmentioning

confidence: 99%

Depositional architecture, provenance, and tectonic/eustatic modulation of Miocene submarine fans in the Shikoku Basin: Results from Nankai Trough Seismogenic Zone Experiment

Pickering

Underwood

Saito

et al. 2013

Geochem Geophys Geosyst

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Seismostratigraphy, coring, and logging while drilling during Integrated Ocean Drilling Program Expeditions 319, 322, and 333 (Sites C0011/C0012) show three Miocene submarine fans in the NE Shikoku Basin, with broadly coeval deposits at Ocean Drilling Program Site 1177 and Deep Sea Drilling Project Site 297 (NW Shikoku Basin). The sediment dispersal patterns have major implications for paleogeographies at that time. The oldest, finer‐grained (Kyushu) fan has sheet‐like geometry; quartz‐rich flows were fed mostly from an ancestral landmass in the East China Sea. During prolonged hemipelagic mud deposition at C0011‐C0012 (~12.2 to 9.1 Ma), sand supply continued at Sites 1177 and 297. Sand delivery to much of the Shikoku Basin halted during a phase of sinistral strike slip to oblique plate motion, after which the Daiichi Zenisu Fan (~9.1 to 8.0 Ma) was fed by submarine channels. The youngest fan (Daini Zenisu; ~8.0 to 7.6 Ma) has sheet‐like geometry with thick‐bedded, coarse‐grained pumiceous sandstones. The pumice fragments were fed from a mixed provenance that included the collision zone of the Izu‐Bonin and Honshu Arcs. The shift from channelized to sheet‐like flows was favored by renewal of relatively rapid northward subduction, which accentuated the trench as a bathymetric depression. Increased sand supply appears to correlate with long‐term eustatic lowstands of sea level. The stratigraphic position and 3‐D geometry of the sandbodies have important implications for subduction‐related processes, including the potential for focused fluid flow and fluid overpressures above and below the plate boundary fault: In sheet‐like sands, pathways for fluid flow have greater horizontal permeability compared with those in channel sands.

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“…Furthermore, changes in shelf exposure related to sea level is consistent with advancement of the Yellow and Yangtze rivers across the continental shelf toward the Okinawa Trough during glacial periods (Diekmann et al, ; Dou et al, ; Oiwane et al, ). The advancement of these major river mouths would predominantly focus sediment supply from the paleo‐Yellow River to the region of Sites U1428 and U1429 in the Okinawa Trough, compared to the present when the sediment is trapped on the inner continental shelf (Xu et al, ).…”

Section: Geochemical Evolution Of the East China Seamentioning

confidence: 99%

Climatically Driven Changes in the Supply of Terrigenous Sediment to the East China Sea

Anderson

Murray

Dunlea

et al. 2018

Geochem Geophys Geosyst

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We examine the paleoceanographic record over the last ∼400 kyr derived from major, trace, and rare earth elements in bulk sediment from two sites in the East China Sea drilled during Integrated Ocean Drilling Program Expedition 346. We use multivariate statistical partitioning techniques (Q‐mode factor analysis, multiple linear regression) to identify and quantify five crustal source components (Upper Continental Crust (UCC), Luochuan Loess, Xiashu Loess, Southern Japanese Islands, Kyushu Volcanics), and model their mass accumulation rates (MARs). UCC (35–79% of terrigenous contribution) and Luochuan Loess (16–55% contribution) are the most abundant end‐members through time, while Xiashu Loess, Southern Japanese Islands, and Kyushu Volcanics (1–22% contribution) are the lowest in abundance when present. Cycles in UCC and Luochuan Loess MARs may indicate continental and loess‐like material transported by major rivers into the Okinawa Trough. Increases in sea level and grain size proxy (e.g., SiO2/Al2O3) are coincident with increased flux of Southern Japanese Islands, indicating localized sediment supply from Japan. Increases in total terrigenous MAR precede minimum relative sea levels by several thousand years and may indicate remobilization of continental shelf material. Changes in the relative contribution of these end‐members are decoupled from total MAR, indicating compositional changes in the sediment are distinct from accumulation rate changes but may be linked to variations in sea level, riverine and eolian fluxes, and shelf‐bypass processes over glacial‐interglacials, complicating accurate monsoon reconstructions from fluvial dominated sediment.

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Geomorphological development of the Goto Submarine Canyon, northeastern East China Sea

Cited by 21 publications

References 33 publications

Facies architecture, detrital provenance, and tectonic modulation of sedimentation in the Shikoku Basin: Inputs to the Nankai Trough subduction zone

Facies architecture, detrital provenance, and tectonic modulation of sedimentation in the Shikoku Basin: Inputs to the Nankai Trough subduction zone

Depositional architecture, provenance, and tectonic/eustatic modulation of Miocene submarine fans in the Shikoku Basin: Results from Nankai Trough Seismogenic Zone Experiment

Climatically Driven Changes in the Supply of Terrigenous Sediment to the East China Sea

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