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• W3114099727 endingPage "1730" @default.
• W3114099727 startingPage "1711" @default.
• W3114099727 abstract "Lateral spread and submarine creep are processes that occur near the headwalls of both terrestrial landslides and submarine mass-transport complexes (MTCs). Both submarine creep and spread deposits may contain giant (km-scale) coherent blocks, but their transport processes remain poorly constrained. Here we use seismic reflection data to determine the geometry, scale, and origin of a Late Miocene mass-transport complex (MTC) located in the Kangaroo Syncline, offshore NW Australia. We show that this large remobilised mass of carbonate ooze is ca. 170–300 m thick and covers an area of at least 1,050 km2. The deposit is defined internally by two distinct seismic facies: (a) large, upward-tapering blocks (210–300 m thick, 170–210 m wide and 800–1,200 m long) with negligible internal deformation, which decrease in height and spacing along the transport direction (identical, but in situ, seismic facies forms undeformed slope material immediately updip of the deposit headwall); and (b) troughs (160–260 m thick, 190–230 m wide and 800–1,200 m long) comprising moderately deformed strata, which contain ‘v’-shaped, pipe-like structures that extend upwards from the inferred basal shear surface to the top surface. The lack of deformation within the blocks, and their correlation to adjacent in situ deposits, suggests they underwent limited transport (ca. 50 m–70 m). The relatively high degree of deformation within the intervening troughs is attributed to the vertical expulsion of fluids and sediment during hydraulic failure of the sediment mass. We present a hydraulic failure model that invokes evacuation of the lower slope by a precursor MTC and which formed the space to trigger the lateral spread. Our study also provides new insights into the genesis and rheology of subaqueous lateral spreads. The genetic links identified between mass wasting and spatially focused fluid flow, as well as disturbing the deep seafloor, indicate that submarine landslides may also create important deep-sea biodiversity hotspots." @default.
• W3114099727 created "2021-01-05" @default.
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• W3114099727 date "2021-01-21" @default.
• W3114099727 modified "2023-09-26" @default.
• W3114099727 title "The formation and implications of giant blocks and fluid escape structures in submarine lateral spreads" @default.
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• W3114099727 doi "https://doi.org/10.1111/bre.12532" @default.
• W3114099727 hasPublicationYear "2021" @default.

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