Megabreccia shedding from modern, low-relief carbonate platforms, Nicaraguan Rise

Hine, Albert C.; Locker, Stanley D.; Tedesco, Lenore P.; Mullins, Henry T.; Hallock, Pamela; Belknap, Daniel F.; Gonzales, J.L.; Neumann, Andreas; Snyder, Stephen W.

doi:10.1130/0016-7606(1992)104<0928:msfmlr>2.3.co;2

Cited by 70 publications

(43 citation statements)

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“…Similar seabed ploughing has been observed in other large submarine debris flows (Prior et al, 1984). Large blocks that appear to retain the stratigraphy of their source are also common, and have been previously documented in large, carbonate debris-flow deposits (Hine et al, 1992). Finally, the structure of the seabed surrounding the deposit is disturbed, even beyond the point at which the flow stopped.…”

Section: Observations Of Submarine Debris Flowssupporting

confidence: 65%

The Mechanics of Marine Sediment Gravity Flows

Parsons

Friedrichs

Traykovski

et al. 2007

Continental Margin Sedimentation

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Sediment gravity flows, particularly those in the marine environment, are dynamically interesting because of the non-linear interaction of mixing, sediment entrainment/suspension and water-column stratification. Turbidity currents, which are strongly controlled by mixing at their fronts, are the best understood mode of sediment gravity flows. The type of mixing not only controls flow and deposition near the front, but also changes the dynamics of turbidity currents flowing in self-formed channels. Debris flows, on the other hand, mix little with ambient fluid. In fact, they have been shown to hydroplane, i.e. glide on a thin film of water. Hydroplaning enables marine debris flows to runout much farther than their subaerial equivalents. Some sediment gravity flows require external energy, from sources such as surface waves. When these flows are considered as stratification-limited turbidity currents, models are able to predict observed downslope sediment fluxes. Most marine sediment gravity flows are supercritical and thus controlled by sediment supply to the water column. Therefore, the genesis of the flows is the key to their understanding and prediction. Virtually every subaqueous failure produces a turbidity current, but they engage only a small percentage of the initially failed material. Wave-induced resuspension can produce and sustain sediment gravity flows. Flooding rivers can also do this, but the complex interactions of settling and turbulence need to be better understood and measured to quantify this effect and document its occurrence. Ultimately, only integrative numerical models can connect these related phenomena, and supply realistic predictions of the marine record.

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Section: Observations Of Submarine Debris Flowssupporting

confidence: 65%

The Mechanics of Marine Sediment Gravity Flows

Parsons

Friedrichs

Traykovski

et al. 2007

Continental Margin Sedimentation

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“…7). The size of the blocks is comparable to those in the megabreccia debris flow deposits described from the Canning basin (Playford, 1980) and the modern Nicaraguan Rise (Hine et al, 1992).…”

Section: Debris and Block Fieldsupporting

confidence: 58%

“…These margin collapses are reminiscent of steep embayments that have been observed in many ancient examples and linked to catastrophic margin collapse based on the deposition of breccias and megabreccias on the slope and basin floor (Cook et al, 1972;Playford, 1980;Mullins et al, 1991;Hine et al, 1992;Eberli et al, 1993;Morsilli et al, 2002;Janson et al, 2007Janson et al, , 2009). Mullins and Hine (1989) used the term 'scalloped margin' to describe the largest (plurikilometer) of such convex-bankward embayments.…”

Section: Introductionmentioning

confidence: 99%

Margin collapse and slope failure along southwestern Great Bahama Bank

Eberli

Grasmueck

2015

Sedimentary Geology

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“…Slide masses can be traced seismically for about 1.5 km (5000 ft) into the basin. They appear as lobeshaped bodies of chaotic and wavy reflections (Hine et al, 1992(Hine et al, , 1994van Weering, Nielsen, Kenyon, Akentieva, & Kuijpers, 1998). The landslides appear to be triggered by faults.…”

Section: Sedimentological Interpretationmentioning

confidence: 99%