Slope Instability And Mass Transport Deposits On The Godavari River Delta, East Indian Margin From A Regional Geological Perspective

2007 ◽  
pp. 19-27 ◽  
Author(s):  
C. F. Forsberg ◽  
A. Solheim ◽  
T. J. Kvalstad ◽  
R. Vaidya ◽  
S. Mohanty
Keyword(s):  
Mass Transport ◽  
River Delta ◽  
Slope Instability ◽  
East Indian ◽  
Godavari River ◽  
Mass Transport Deposits

scholarly journals Evidence of slope instability in the Southwestern Adriatic Margin

2006 ◽  
Vol 6 (1) ◽  
pp. 1-20 ◽  
Author(s):  
D. Minisini ◽  
F. Trincardi ◽  
A. Asioli
Keyword(s):  
Mass Transport ◽  
Sediment Cores ◽  
Sediment Accumulation ◽  
Slope Instability ◽  
Stratigraphic Correlation ◽  
Bottom Currents ◽  
Sediment Drifts ◽  
Basin Floor ◽  
Mass Transport Deposits ◽  
Lower Slope

Abstract. The Southwestern Adriatic Margin (SAM) shows evidence of widespread failure events that generated slide scars up to 10 km wide and extensive slide deposits with run out distances greater than 50 km. Chirp-sonar profiles, side-scan sonar mosaics, multibeam bathymetry and sediment cores document that the entire slope area underwent repeated failures along a stretch of 150 km and that mass-transport deposits, covering an area of 3320 km2, are highly variable ranging from blocky slides to turbidites, and lay on the lower slope and in the basin. The SAM slope between 300–700 m is impacted by southward bottom currents shaping sediment drifts (partly affected by failure) and areas of dominant erosion of the seafloor. When slide deposits occur in areas swept by bottom currents their fresh appearence and their location at seafloor may give the misleading impression of a very young age. Seismic-stratigraphic correlation of these deposits to the basin floor, however, allow a more reliable age estimate through sediment coring of the post-slide unit. Multiple buried failed masses overlap each other in the lower slope and below the basin floor; the most widespread of these mass-transport deposits occurred during the MIS 2-glacial interval on a combined area of 2670 km2. Displacements affecting Holocene deposits suggest recent failure events during or after the last phases of the last post-glacial eustatic rise. Differences in sediment accumulation rates at the base or within the sediment drifts and presence of downlap surfaces along the slope and further in the basin may provide one or multiple potential weak layers above which widespread collapses take place. Neotectonic activity and seismicity, together with the presence of a steep slope, represent additional elements conducive to sediment instability and failure along the SAM. Evidence of large areas still prone to failure provides elements of tsunamogenic hazard.

Giant mass-transport deposits in the southern Scotia Sea (Antarctica)

2018 ◽  
Vol 477 (1) ◽  
pp. 195-205 ◽  
Author(s):  
Luis Somoza ◽  
Teresa Medialdea ◽  
Francisco J. González
Keyword(s):  
Mass Transport ◽  
Regional Scale ◽  
Slope Instability ◽  
Continental Margins ◽  
Scotia Sea ◽  
Swath Bathymetry ◽  
Diagenetic Alteration ◽  
Silica Diagenesis ◽  
Seismic Sections ◽  
Mass Transport Deposits

AbstractOn the basis of 2D multichannel and very-high-resolution seismic data and swath bathymetry, we report a sequence of giant mass-transport deposits (MTDs) in the Scan Basin (southern Scotia Sea, Antarctica). MTDs with a maximum thickness of c. 300 m extend up to 50 km from the Discovery and Bruce banks towards the Scan Basin. The headwall area consists of multiple U-shaped scars intercalated between volcanic edifices, up to 250 m high and 7 km wide, extending c. 14 km downslope from 1750 to 2900 m water depth. Seismic sections show that these giant MTDs are triggered by the intersection between diagenetic fronts related to silica transformation and vertical fluid-flow pipes linked to magmatic sills emplaced within the sedimentary sequence of the Scan Basin. This work supports that the diagenetic alteration of siliceous sediments is a possible cause of slope instability along world continental margins where bottom-simulating reflectors related to silica diagenesis are present at a regional scale.

scholarly journals Late Cenozoic shelf delta development and Mass Transport Deposits in the Dutch offshore area – results of 3D seismic interpretation

2012 ◽  
Vol 91 (4) ◽  
pp. 591-608 ◽  
Author(s):  
A. Benvenuti ◽  
H. Kombrink ◽  
J.H. ten Veen ◽  
D.K. Munsterman ◽  
F. Bardi ◽  
...  
Keyword(s):  
Mass Transport ◽  
Sea Level ◽  
North Sea ◽  
Sediment Supply ◽  
Slope Instability ◽  
Shear Surface ◽  
Southern North Sea ◽  
Basal Shear ◽  
Mass Transport Deposits ◽  
High Sediment

AbstractIn this study, seismic stratigraphic criteria have been used to characterise the evolution of the Southern North Sea (SNS) shelf-delta system that progressively filled the Southern North Sea basin during Plio-Pleistocene times. Based on the prograding and down-stepping architecture of the shelf-delta sequence it is inferred that deposition occurred during a time of high sediment supply and overall sea-level lowering. During this time the delta slopes failed several times, creating at least 30 internally coherent Mass Transport Deposits (MTDs) mainly grouped in common areas, affecting the same clinoform set and partially sharing the basal shear surface (groups of MTDs). The most important features of the studied MTDs are 1) the dominance of brittle deformation; 2) the small amount of material removal from the headwall domain (lack of completely depleted areas above the basal shear surface); and 3) the lack of an emergent toe domain above the un-failed sediment located basinward, although proper confining geometries for the MTD are not detected. Therefore, the studied MTDs can neither be classified as frontally confined nor as frontally emergent but they are a new intermediate type of submarine landslides which has not been described before. These characteristics suggest that the mass movement ceased relatively soon after initiation of failure. Incisions on top of the MTDs suggest the presence of erosive flows. These flows were probably generated due to a concentration of the drainage in the negative morphology the failure event left behind in the upper sector of the slope. The stronger progradational character of the reflections on top of MTDs confirms a concentration of drainage after the erosional phase too.The interplay between high sediment supply and constant or even decreasing accommodation space (caused by constant or decreasing sea-level) is supposed to be the main precondition for slope instability for most of the MTDs in this study area. Slope failures themselves can also be considered a preconditioning factor by the creation of local very high sedimentation rates (see groups of MTDs). Salt-induced seismicity and storm waves' effect superimposed on high frequency sea level fall are considered the most important triggering factors.

Shelf-derived mass-transport deposits: origin and significance in the stratigraphic development of trench-slope basins

2021 ◽  
pp. 1-36
Author(s):  
Barbara Claussmann ◽  
Julien Bailleul ◽  
Frank Chanier ◽  
Geoffroy Mahieux ◽  
Vincent Caron ◽  
...  
Keyword(s):  
Mass Transport ◽  
Mass Transport Deposits ◽  
Trench Slope

scholarly journals Mass-transport deposits and fluid venting in a transform margin setting, the eastern Demerara Plateau (French Guiana)

2013 ◽  
Vol 46 ◽  
pp. 287-303 ◽  
Author(s):  
F. Pattier ◽  
L. Loncke ◽  
V. Gaullier ◽  
C. Basile ◽  
A. Maillard ◽  
...  
Keyword(s):  
Mass Transport ◽  
French Guiana ◽  
Margin Setting ◽  
Transform Margin ◽  
Fluid Venting ◽  
Mass Transport Deposits

Mass-transport deposits on the Rosetta province (NW Nile deep-sea turbidite system, Egyptian margin): Characteristics, distribution, and potential causal processes

2008 ◽  
Vol 250 (3-4) ◽  
pp. 180-198 ◽  
Author(s):  
Sébastien Garziglia ◽  
Sébastien Migeon ◽  
Emmanuelle Ducassou ◽  
Lies Loncke ◽  
Jean Mascle
Keyword(s):  
Mass Transport ◽  
Deep Sea ◽  
Causal Processes ◽  
Turbidite System ◽  
Mass Transport Deposits

Mass Transport Deposits on the Southwestern Newfoundland Slope

2010 ◽  
pp. 657-665 ◽  
Author(s):  
M. K. Giles ◽  
D. C. Mosher ◽  
D. J. W. Piper ◽  
G. D. Wach
Keyword(s):  
Mass Transport ◽  
Mass Transport Deposits
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