Tectonically controlled initiation of contemporaneous deep-water channel systems along a Late Cretaceous continental margin, western British Columbia, Canada

Sedimentology ◽  
2018 ◽  
Vol 65 (7) ◽  
pp. 2404-2438 ◽  
Author(s):  
Rebecca G. Englert ◽  
Stephen M. Hubbard ◽  
Daniel S. Coutts ◽  
William A. Matthews
Keyword(s):  
British Columbia ◽  
Continental Margin ◽  
Late Cretaceous ◽  
Deep Water ◽  
Water Channel ◽  
Channel Systems

scholarly journals Evolution of a Late Miocene Deep-water Depositional System in the Southern Taranaki Basin, New Zealand

2021 ◽  
Author(s):  
Clayton Silver ◽  
Heather Bedle
Keyword(s):  
New Zealand ◽  
Deep Water ◽  
Late Miocene ◽  
Water Channel ◽  
Three Dimensional ◽  
Depositional Environments ◽  
Architectural Elements ◽  
Shelf Slope ◽  
Spatio Temporal ◽  
Channel Systems

A long-standing problem in the understanding of deep-water turbidite reservoirs relates to how the three-dimensional evolution of deep-water channel systems evolve in response to channel filling on spatio-temporal scales, and how depositional environments affect channel architecture. The 3-D structure and temporal evolution of late Miocene deep-water channel complexes in the southern Taranaki Basin, New Zealand is investigated, and the geometry, distribution and stacking patterns of the channel complexes are analyzed. Two recently acquired 3-D seismic datasets, the Pipeline-3D (proximal) and Hector-3D (distal) are analyzed. These surveys provide detailed imaging of late Miocene deep-water channel systems, allowing for the assessment of the intricate geometry and seismic geomorphology of the systems. Seismic attributes resolve the channel bodies and the associated architectural elements. Spectral decomposition, amplitude curvature, and coherence attributes reveal NW-trending straight to low-sinuosity channels and less prominent NE-trending high-sinuosity feeder channels. Stratal slices across the seismic datasets better characterize the architectural elements. The mapped turbidite systems transition from low-sinuosity to meandering high-sinuosity patterns, likely caused by a change in the shelf-slope gradient due to localized structural relief. Stacking facies patterns within the channel systems reveal the temporal variation from a depositional environment characterized by sediment bypass to vertically aggrading channel systems.

Overbank sediment waves in the Southern Taranaki Basin, New Zealand

2020 ◽  
pp. 1-13
Author(s):  
Clayton Silver ◽  
Heather Bedle
Keyword(s):  
New Zealand ◽  
Cross Section ◽  
Deep Water ◽  
Late Miocene ◽  
Seismic Data ◽  
Water Channel ◽  
Sediment Waves ◽  
Continuous Record ◽  
Study Interval ◽  
Channel Systems

Modern 3-D seismic data in the southern Taranaki Basin reveals a continuous record of deep-water channel systems initiating in the late Miocene. Investigation of a selected interval of the Mount Messenger Formation channel systems reveals shingled, down-lapping reflectors when viewed in cross section. Volume attributes were generated and subsequently extracted upon interpreted surfaces and stratal slices through the study interval to characterize the interesting features in the seismic data. Combining attribute and seismic geomorphologic interpretations indicates that these features are likely scarps related to overbank sediment waves.

scholarly journals Evolution of a Late Miocene Deep-Water Depositional System in the Southern Taranaki Basin, New Zealand

Geosciences ◽  
2021 ◽  
Vol 11 (8) ◽  
pp. 329
Author(s):  
Clayton Silver ◽  
Heather Bedle
Keyword(s):  
New Zealand ◽  
Deep Water ◽  
Late Miocene ◽  
Water Channel ◽  
Three Dimensional ◽  
Depositional Environments ◽  
Architectural Elements ◽  
Shelf Slope ◽  
Structural Relief ◽  
Channel Systems

A long-standing problem in the understanding of deep-water turbidite reservoirs relates to how the three-dimensional evolution of deep-water channel systems evolve in response to channel filling on spatiotemporal scales, and how depositional environments affect channel architecture. The 3-D structure and temporal evolution of late Miocene deep-water channel complexes in the southern Taranaki Basin, New Zealand is investigated, and the geometry, distribution, and stacking patterns of the channel complexes are analyzed. Two recently acquired 3-D seismic datasets, the Pipeline-3D (proximal) and Hector-3D (distal) are analyzed. These surveys provide detailed imaging of late Miocene deep-water channel systems, allowing for the assessment of the intricate geometry and seismic geomorphology of the systems. Seismic attributes resolve the channel bodies and the associated architectural elements. Spectral decomposition, amplitude curvature, and coherence attributes reveal NW-trending straight to low-sinuosity channels and less prominent NE-trending high-sinuosity feeder channels. Stratal slices across the seismic datasets better characterize the architectural elements. The mapped turbidite systems transition from low-sinuosity to meandering high-sinuosity patterns, likely caused by a change in the shelf-slope gradient due to localized structural relief. Stacking facies patterns within the channel systems reveal the temporal variation from a depositional environment characterized by sediment bypass to vertically aggrading channel systems.

scholarly journals Geological and seismic evidence for the tectonic volution of the NE Oman continental margin and Gulf of Oman

Geosphere ◽  
2021 ◽  
Author(s):  
Bruce Levell ◽  
Michael Searle ◽  
Adrian White ◽  
Lauren Kedar ◽  
Henk Droste ◽  
...  
Keyword(s):  
Continental Margin ◽  
Late Cretaceous ◽  
Deep Water ◽  
Large Scale ◽  
Accretionary Prism ◽  
Oceanic Lithosphere ◽  
Seismic Reflection Data ◽  
Gulf Of Oman ◽  
Semail Ophiolite

Late Cretaceous obduction of the Semail ophiolite and underlying thrust sheets of Neo-Tethyan oceanic sediments onto the submerged continental margin of Oman involved thin-skinned SW-vergent thrusting above a thick Guadalupian–Cenomanian shelf-carbonate sequence. A flexural foreland basin (Muti and Aruma Basin) developed due to the thrust loading. Newly available seismic reflection data, tied to wells in the Gulf of Oman, suggest indirectly that the trailing edge of the Semail Ophiolite is not rooted in the Gulf of Oman crust but is truncated by an ENE-dipping extensional fault parallel to the coastline. This fault is inferred to separate the Semail ophiolite to the SW from in situ oceanic Gulf of Oman crust to the NE. It forms the basin margin to a “hinterland” basin formed atop the Gulf of Oman crust, in which 5 km of Late Cretaceous deep-water mudstones accumulated together with 4 km of Miocene and younger deep-water mudstones and sandstones. Syndepositional folding included Paleocene–Eocene folds on N-S axes, and Paleocene to Oligocene growth faults with roll-over anticlines, along the basin flank. Pliocene compression formed, or tightened, box folds whose axes parallel the modern coast with local south-vergent thrusts and reversal of the growth faults. This Pliocene compression resulted in large-scale buckling of the Cenozoic section, truncated above by an intra-Pliocene unconformity. A spectacular 60-km-long, Eocene(?) to Recent, low-angle, extensional, gravitational fault, down-throws the upper basin fill to the north. The inferred basement of the hinterland basin is in situ Late Cretaceous oceanic lithosphere that is subducting northwards beneath the Makran accretionary prism.

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