Sedimentation rates and patterns on a deep-water delta (Fraser Delta, Canada); integration of high-resolution seismic stratigraphy, core lithofacies, and 137 Cs fallout stratigraphy

1998 ◽  
Vol 68 (4) ◽  
pp. 556-568 ◽  
Author(s):  
B. S. Hart ◽  
T. S. Hamilton ◽  
J. V. Barrie
Keyword(s):  
High Resolution ◽  
Deep Water ◽  
Seismic Stratigraphy ◽  
Sedimentation Rates

Controls On Deep-Water Sand Delivery Beyond the Shelf Edge: Accommodation, Sediment Supply, and Deltaic Process Regime

2020 ◽  
Vol 90 (1) ◽  
pp. 104-130 ◽  
Author(s):  
Victorien Paumard ◽  
Julien Bourget ◽  
Tobi Payenberg ◽  
Annette D. George ◽  
R. Bruce Ainsworth ◽  
...  
Keyword(s):  
High Resolution ◽  
Deep Water ◽  
Seismic Data ◽  
Seismic Stratigraphy ◽  
Seismic Interpretation ◽  
Sediment Supply ◽  
Shelf Edge ◽  
3D Seismic ◽  
Process Regime ◽  
Shelf Margin

ABSTRACT Stratigraphic models typically predict accumulation of deep-water sands where coeval shelf-edge deltas are developed in reduced-accommodation and/or high-sediment-supply settings. On seismic data, these relationships are commonly investigated on a small number of clinothems, with a limited control on their lateral variability. Advanced full-volume seismic interpretation methods now offer the opportunity to identify high-order (i.e., 4th to 5th) seismic sequences (i.e., clinothems) and to evaluate the controls on shelf-to-basin sediment transfer mechanisms and deep-water sand accumulation at these high-frequency scales. This study focuses on the Lower Barrow Group (LBG), a shelf margin that prograded in the Northern Carnarvon Basin (North West Shelf, Australia) during the Early Cretaceous. Thanks to high-resolution 3D seismic data, 30 clinothems (average time span of ∼ 47,000 years) from the D. lobispinosum interval (142.3–140.9 Ma) are used to establish quantitative and statistical relationships between the shelf-margin architecture, paleoshoreline processes, and deep-water system types (i.e., quantitative 3D seismic stratigraphy). The results confirm that low values of rate of accommodation/rate of sediment supply (δA/δS) conditions on the shelf are associated with sediment bypass, whereas high δA/δS conditions are linked to increasing sediment storage on the shelf. However, coastal process regimes at the shelf edge play a more important role in the behavior of deep-water sand delivery. Fluvial-dominated coastlines are typically associated with steep slope gradients and more mature, longer run-out turbidite systems. In contrast, wave-dominated shorelines are linked to gentle slope gradients, with limited development of turbidite systems (except rare sheet sands and mass-transport deposits), where longshore drift currents contributed to shelf-margin accretion through the formation of extensive strandplains. In this context, reduced volumes of sand were transported offshore and mud belts were accumulated locally. This study highlights that variations from fluvial- to wave-dominated systems can result in significant lateral changes in shelf-margin architecture (i.e., slope gradient) and impact the coeval development of deep-water systems (i.e., architectural maturity). By integrating advanced tools in seismic interpretation, quantitative 3D seismic stratigraphy represents a novel approach in assessing at high resolution the controls on deep-water sand delivery, and potentially predicting the type and location of reservoirs in deep water based on the shelf-margin architecture and depositional process regime.

Decadal climate sensitivity of contouritic sedimentation in a dynamically coupled ice-ocean-sediment model of the Pan-Arctic region

2021 ◽  
Author(s):  
Catherine Drinkorn ◽  
Jan Saynisch-Wagner ◽  
Gabriele Uenzelmann-Neben ◽  
Maik Thomas
Keyword(s):  
Deep Water ◽  
Arctic Region ◽  
Meridional Overturning Circulation ◽  
Ocean Dynamics ◽  
Sedimentation Rates ◽  
Climate Conditions ◽  
The North ◽  
Ocean Sediment ◽  
Set Up ◽  
Sediment Model

<p>Ocean sediment drifts contain important information about past bottom currents but a direct link from the study of sedimentary archives to ocean dynamics is not always possible. To close this gap for the North Atlantic, we set up a  new coupled Ice-Ocean-Sediment Model of the entire Pan-Arctic region. In order to evaluate the potential dynamics of the model, we conducted decadal sensitivity experiments. In our model contouritic sedimentation shows a significant sensitivity towards climate variability for most of the contourite drift locations in the model domain. We observe a general decrease of sedimentation rates during warm conditions with decreasing atmospheric and oceanic gradients and an extensive increase of sedimentation rates during cold conditions with respective increased gradients. We can relate these results to changes in the dominant bottom circulation supplying deep water masses to the contourite sites under different climate conditions. A better understanding of northern deep water pathways in the Atlantic Meridional Overturning Circulation (AMOC) is crucial for evaluating possible consequences of climate change in the ocean.</p>

High-resolution seismic stratigraphy and morphology of the Scan Basin contourite fan, southern Scotia Sea, Antarctica

2016 ◽  
Vol 378 ◽  
pp. 361-373 ◽  
Author(s):  
Marga García ◽  
Francisco J. Lobo ◽  
Andrés Maldonado ◽  
F. Javier Hernández-Molina ◽  
Fernando Bohoyo ◽  
...  
Keyword(s):  
High Resolution ◽  
Seismic Stratigraphy ◽  
Scotia Sea

High-Resolution Seismic Stratigraphy Offshore Haeundae Beach in Busan, South Korea

2020 ◽  
Vol 102 (sp1) ◽  
Author(s):  
Dong-Lim Choi ◽  
Dong-Hyeok Shin ◽  
Jae-Youll Jin ◽  
Yong-Kuk Lee ◽  
Byung-Cheol Kum
Keyword(s):  
High Resolution ◽  
South Korea ◽  
Seismic Stratigraphy

High-resolution Optical Imaging for Deep-water Archaeology

2021 ◽  
pp. 30-40
Author(s):  
Hanumant Singh ◽  
Christopher Roman ◽  
Oscar Pizarro ◽  
Brendan Foley ◽  
Ryan Eustic ◽  
...  
Keyword(s):  
High Resolution ◽  
Optical Imaging ◽  
Deep Water
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