scholarly journals Knickpoints and crescentic bedform interactions in submarine channels

Sedimentology ◽  
2021 ◽  
Author(s):  
Ye Chen ◽  
Daniel R. Parsons ◽  
Stephen M. Simmons ◽  
Rebecca Williams ◽  
Matthieu J.B. Cartigny ◽  
...  
Keyword(s):  
Submarine Channels

scholarly journals The Role of Mass Wasting In the Progressive Development Of Submarine Channels (Espírito Santo Basin, Se Brazil)

2017 ◽  
Vol 87 (5) ◽  
pp. 500-516 ◽  
Author(s):  
Yongpeng Qin ◽  
Tiago M. Alves ◽  
José Constantine ◽  
Davide Gamboa
Keyword(s):  
Mass Wasting ◽  
Submarine Channels ◽  
Espírito Santo ◽  
Progressive Development ◽  
Se Brazil ◽  
Espirito Santo

Flow processes and sedimentation associated with erosion and filling of sinuous submarine channels

Geology ◽  
2012 ◽  
Vol 40 (2) ◽  
pp. 143-146 ◽  
Author(s):  
David R. Pyles ◽  
Mark Tomasso ◽  
David C. Jennette
Keyword(s):  
Submarine Channels ◽  
Flow Processes

How submarine channels (re)shape continental margins

2020 ◽  
Vol 90 (11) ◽  
pp. 1581-1600
Author(s):  
Luke A. Pettinga ◽  
Zane R. Jobe
Keyword(s):  
Continental Margin ◽  
Evolution Model ◽  
Sediment Supply ◽  
Tectonic Deformation ◽  
Continental Margins ◽  
Sedimentary Processes ◽  
Submarine Channels ◽  
Active Tectonic ◽  
Tectonic Settings ◽  
Longitudinal Profiles

ABSTRACT Submarine landscapes, like their terrestrial counterparts, are sculpted by autogenic sedimentary processes toward morphologies at equilibrium with their allogenic controls. While submarine channels and nearby, inter-channel continental-margin areas share boundary conditions (e.g., terrestrial sediment supply, tectonic deformation), there are significant differences between the style, recurrence, and magnitude of their respective autogenic sedimentary processes. We predict that these process-based differences affect the rates of geomorphic change and equilibrium (i.e., graded) morphologies of submarine-channel and continental-margin longitudinal profiles. To gain insight into this proposed relationship, we document, classify (using machine learning), and analyze longitudinal profiles from 50 siliciclastic continental margins and associated submarine channels which represent a range of sediment-supply regimes and tectonic settings. These profiles tend to evolve toward smooth, lower-gradient longitudinal profiles, and we created a “smoothness” metric as a proxy for the relative maturity of these profiles toward the idealized equilibrium profile. Generally, higher smoothness values occur in systems with larger sediment supply, and the smoothness of channels typically exceeds that of the associated continental margin. We propose that the high rates of erosion, bypass, and deposition via sediment gravity flows act to smooth and mature channel profiles more rapidly than the surrounding continental margin, which is dominated by less-energetic diffusive sedimentary processes. Additionally, tectonic deformation will act to reduce the smoothness of these longitudinal profiles. Importantly, the relationship between total sediment supply and the difference between smoothness values of associated continental margins and submarine channels (the “smoothness Δ”) follows separate trends in passive and active tectonic settings, which we attribute to the variability in relative rates of smoothness development between channelized and inter-channel environments in the presence or absence of tectonic deformation. We propose two endmember pathways by which continental margins and submarine channels coevolve towards their respective equilibrium profiles with increased sediment supply: 1) Coupled Evolution Model (common in passive tectonic settings), in which the smoothness Δ increases only slightly before remaining static, and 2) Decoupled Evolution Model (common in active tectonic settings), in which the smoothness Δ increases more rapidly and to a greater final value. Our analysis indicates that the interaction of the allogenic factors of sediment supply and tectonic deformation with the autogenic sedimentary processes characteristic of channelized and inter-channel areas of the continental margin may account for much of the variability between coevolution pathways and depositional architectures.

scholarly journals Stream power controls the braiding intensity of submarine channels similarly to rivers

2017 ◽  
Vol 44 (10) ◽  
pp. 5062-5070 ◽  
Author(s):  
Steven Y. J. Lai ◽  
Samuel S. C. Hung ◽  
Brady Z. Foreman ◽  
Ajay B. Limaye ◽  
Jean-Louis Grimaud ◽  
...  
Keyword(s):  
Stream Power ◽  
Submarine Channels

scholarly journals Environment of Deposition and Paleogeography of the Late Cretaceous Glenburn Formation, Eastern North Island, New Zealand

2021 ◽  
Author(s):  
◽  
James McClintock
Keyword(s):  
New Zealand ◽  
Late Cretaceous ◽  
Large Scale ◽  
East Coast ◽  
Three Dimensional ◽  
Depositional Environments ◽  
Tectonic Deformation ◽  
Turbidity Currents ◽  
Submarine Fan ◽  
Submarine Channels

<p>The Glenburn Formation of the East Coast of New Zealand is a Late Cretaceous sedimentary formation consisting of alternating layers of sandstone, mudstone and conglomerate. The Glenburn Formation spans a depositional timeframe of over 10 Ma, is over 1000 m thick, is regionally extensive and is possibly present over large areas offshore. For these reasons, it is important to constrain the paleoenvironment of this unit.  Late Cretaceous paleogeographic reconstructions of the East Coast Basin are, however, hampered by a number of factors, including the pervasive Neogene to modern tectonic deformation of the region, the poorly understood nature of the plate tectonic regime during the Cretaceous, and a lack of detailed sedimentological studies of most of the region’s Cretaceous units. Through detailed mapping of the Glenburn Formation, this study aims to improve inferences of regional Cretaceous depositional environments and paleogeography.  Detailed facies based analysis was undertaken on several measured sections in eastern Wairarapa and southern Hawke’s Bay. Information such as bed thickness, grain size and sedimentary structures were recorded in order to identify distinct facies. Although outcrop is locally extensive, separate outcrop localities generally lie in different thrust blocks, which complicates comparisons of individual field areas and prevents construction of the large-scale, three-dimensional geometry of the Glenburn Formation.  Glenburn Formation consists of facies deposited by sediment gravity flows that were primarily turbidity currents and debris flows. Facies observed are consistent with deposition on a prograding submarine fan system. There is significant variation in facies both within and between sections. Several distinct submarine fan architectural components are recognised, such as fan fringes, fan lobes, submarine channels and overbank deposits. Provenance and paleocurrent indicators are consistent with deposition having occurred on several separate submarine fans, and an integrated regional paleogeographic reconstruction suggests that deposition most likely occurred in a fossil trench following the mid-Cretaceous cessation of subduction along the Pacific-facing margin of Gondwana.</p>

scholarly journals Submarine channels "swept" downstream after bend cutoff in salt basins

2018 ◽  
Author(s):  
Jacob Covault ◽  
Zoltan Sylvester ◽  
Michael Hudec ◽  
Can Ceyhan ◽  
Dallas Dunlap
Keyword(s):  
Submarine Channels

scholarly journals Differential compaction over Late Miocene submarine channels in SE Brazil: Implications for trap formation

2017 ◽  
Vol 130 (1-2) ◽  
pp. 208-221 ◽  
Author(s):  
Nicholas I.P. Ward ◽  
Tiago M. Alves ◽  
Tom G. Blenkinsop
Keyword(s):  
Late Miocene ◽  
Submarine Channels ◽  
Trap Formation ◽  
Se Brazil

scholarly journals Supplemental Material: New statistical quantification of the impact of active deformation on the distribution of submarine channels

2021 ◽  
Author(s):  
Marco Pizzi ◽  
A.C. Whittaker ◽  
et al.
Keyword(s):  
Statistical Analysis ◽  
Seismic Imaging ◽  
Submarine Channels ◽  
Active Deformation ◽  
The Impact

Additional details of the study area, methods, seismic imaging of the channels, and statistical analysis.<br>

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