scholarly journals TURBIDITY CURRENTS: A UNIQUE PART OF NOVA SCOTIA’S AFRICAN GEOLOGICAL HERITAGE

2012 ◽  
Vol 47 (1) ◽  
Author(s):  
Carolanne Black
Keyword(s):  
Nova Scotia ◽  
Continental Crust ◽  
Oil And Gas ◽  
Turbidity Current ◽  
Geological Heritage ◽  
Turbidity Currents ◽  
Submarine Landslides ◽  
Grand Banks ◽  
The North ◽  
Unique Part

Four hundred million years ago, when the supercontinent Pangea wastorn apart, a piece of the continental crust from material that is now partof Africa broke off on the North American side. That piece of Africabecame southern Nova Scotia. The African rock was made of materialdeposited by ancient turbidity currents. Created by submarine landslides,turbidity currents still happen today. Whether evaluating these sedimentaryrocks for oil and gas deposits or for building a city, or studying thepossibility of future turbidity currents along the coast to be prepared fora tsunami, turbidity currents are studied by scientists because they havean impact on Nova Scotians.Keywords: turbidite, turbidity current, Grand Banks earthquake,

3D seismic imaging of the submarine slide blocks on the North Slope, Alaska

2020 ◽  
Vol 8 (4) ◽  
pp. SR37-SR44 ◽  
Author(s):  
Shuvajit Bhattacharya ◽  
Sumit Verma ◽  
Jonathan R. Rotzien
Keyword(s):  
Oil And Gas ◽  
Deep Ocean ◽  
Frictional Resistance ◽  
Seismic Attributes ◽  
North Slope ◽  
Submarine Landslides ◽  
Seismic Section ◽  
Submarine Channels ◽  
Submarine Slide ◽  
The North

Submarine landslides are mass movements that transport sediment across the continental shelf to the deep ocean. This phenomenon happens when the shear stress exceeds the frictional resistance of the slope. We analyze a variety of seismic attributes to interpret large submarine slide blocks on the North Slope, Alaska. Results show that the slide blocks appear as mounds with scarps associated with them on the seismic section. The slide blocks vary in size, depending on their distance away from the shelf. The pattern of the slide blocks affects the overlying sedimentation. Geological feature: Submarine slide blocks Seismic appearance: Mound-like steep ramp and scarp characteristics on seismic sections; blocky and irregular features with sharp boundaries on the horizon slices and seismic attributes Features with similar appearance: Mass-transport deposits; Remnant blocks; Reef deposits; Submarine channels; Gullies Formation: Torok Formation Age: Cretaceous Location: North Slope, Alaska Seismic data: Obtained from the Alaska Department of Natural Resources, Division of Oil and Gas, through the tax-credit program ( State of Alaska, 2017 , http://dggs.alaska.gov/gmc/seismic-well-data.php ) Analysis tools: Seismic attributes (such as coherent energy, Sobel-filter similarity, dip magnitude, and dip azimuth) and geobody extraction

scholarly journals Geology and prospects of oil and gas bearing of east — Canadian continental margins

2019 ◽  
Vol 59 (4) ◽  
pp. 656-669
Author(s):  
A. Zabanbark ◽  
L. I. Lobkovsky
Keyword(s):  
Nova Scotia ◽  
Continental Margin ◽  
Late Cretaceous ◽  
Oil And Gas ◽  
Sedimentary Basins ◽  
Wide Distribution ◽  
Labrador Sea ◽  
Continental Margins ◽  
The North ◽  
Gas Bearing

At the limit of the East-Canadian continental margin there are three oil and gas regions from north to south: Labrador Sea shelves, margins of the Great Newfoundland Bank and the continental margin of Nova Scotia. In each of these distinguishing regions are a number of sedimentary basins completely plunging under the water. At the shelf of Labrador Sea distinguishing the following large sedimentary basins: Saglek, Hopdale and Havke, at the margin of Newfoundland Bank it is known the basins: Jeanne d’Arc, Flemish Pass and Orphan. At the Nova Scotia shelf there are Nova Scotian and Sable basins. It is remarkable at the lofty latitude like of Labrador Sea region the age of the productive sediments beginning from more ancient rocks (Paleozoic), than in basins situated in law latitude (Mesozoic). In consequence of this the stratigraphy diapason of oil and gas bearing of the north latitude is considerably wide. The prospect of oil and gas bearing in all region is related principally with continental slopes and turbidites sediments in its. Late Jurassic and early Cretaceous reservoirs would be the aim for deep drilling sediments. Wide distribution of late Cretaceous and early Tertiary prospects reservoirs of oil and gas is quite really so far as they are bedded in the shallow horizons. Also the prospect of oil and gas bearing at the margin of the basin is related to late Cretaceous and Tertiary sediments, to deposits of fan and diapirs salt.

scholarly journals The Geology of Eketahuna (N.Z.M.S.1. N.153)

2021 ◽  
Author(s):  
◽  
Gerrit Neef
Keyword(s):  
Turbidity Current ◽  
Fault Scarp ◽  
The Other ◽  
Turbidity Currents ◽  
Hinge Line ◽  
North East ◽  
The North ◽  
South West ◽  
Fault Block

<p>An interesting rhythmic sequence consisting of massive mudstone and groups of graded beds each about 10 ft thick is exposed near Alfredton, in the southern part of the North Island. During Opoitian time, rotation along a north-east-trending hinge line west of Alfredton caused one side of a fault block to be relatively uplifted and the other depressed, at intervals of several tens of thousands of years, while sedimentation from south-west-flowing turbidity currents was in progress. The sandy fraction of post-faulting turbidity currents were channelled along the depressed side just to the east of the submarine fault scarp, while on the middle and upper slopes of the tilted block mud was deposited from the turbidity-current clouds. As sedimentation proceeded, graded beds on-lapped eastwards up the slope of the tilted block and across the area where muds had been deposited. Later tilting of the block initiated a new rhythm.</p>

Geochemical discriminators and the palaeotectonic environment of the North Mountain basalts, Nova Scotia

1980 ◽  
Vol 17 (12) ◽  
pp. 1740-1745 ◽  
Author(s):  
J. M. Wark ◽  
D. B. Clarke
Keyword(s):  
Nova Scotia ◽  
Continental Crust ◽  
Early Jurassic ◽  
Late Triassic ◽  
Chemical Characteristics ◽  
Sea Floor ◽  
The North ◽  
Sea Floor Spreading

The late Triassic – early Jurassic North Mountain basalts of Nova Scotia have been analyzed for various elements believed to be useful in determining the palaeotectonic environment of eruption. The discriminant diagrams show these basalts to have within-plate affinities, with a possible indication of oceanic chemical characteristics. An oceanic environment, however, is at variance with the field relations, which show the within-plate environment to be continental; thus the oceanic chemical characteristics may suggest eruption through a continental crust that was thinning prior to the onset of active sea-floor spreading later in the Jurassic.

scholarly journals The Geology of Eketahuna (N.Z.M.S.1. N.153)

2021 ◽  
Author(s):  
◽  
Gerrit Neef
Keyword(s):  
Turbidity Current ◽  
Fault Scarp ◽  
The Other ◽  
Turbidity Currents ◽  
Hinge Line ◽  
North East ◽  
The North ◽  
South West ◽  
Fault Block

<p>An interesting rhythmic sequence consisting of massive mudstone and groups of graded beds each about 10 ft thick is exposed near Alfredton, in the southern part of the North Island. During Opoitian time, rotation along a north-east-trending hinge line west of Alfredton caused one side of a fault block to be relatively uplifted and the other depressed, at intervals of several tens of thousands of years, while sedimentation from south-west-flowing turbidity currents was in progress. The sandy fraction of post-faulting turbidity currents were channelled along the depressed side just to the east of the submarine fault scarp, while on the middle and upper slopes of the tilted block mud was deposited from the turbidity-current clouds. As sedimentation proceeded, graded beds on-lapped eastwards up the slope of the tilted block and across the area where muds had been deposited. Later tilting of the block initiated a new rhythm.</p>

Geothermal condition and outlook for oil and gas deposits in the north-west Black Sea shelf

2002 ◽  
Vol 8 (2-3) ◽  
pp. 206-208
Author(s):  
V.G. Osadchyi ◽  
◽  
O.A. Prykhod'ko ◽  
I.I. Hrytsyk ◽  
◽  
...  
Keyword(s):  
Black Sea ◽  
Oil And Gas ◽  
North West ◽  
The North ◽  
West Black Sea
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