scholarly journals Hybrid event beds dominated by transitional-flow facies: character, distribution and significance in the Maastrichtian Springar Formation, north-west Vøring Basin, Norwegian Sea

Sedimentology ◽  
2017 ◽  
Vol 64 (3) ◽  
pp. 747-776 ◽  
Author(s):  
Sarah J. Southern ◽  
Ian A. Kane ◽  
Michał J. Warchoł ◽  
Kristin W. Porten ◽  
William D. McCaffrey
Keyword(s):  
Transitional Flow ◽  
Norwegian Sea ◽  
North West ◽  
Character Distribution ◽  
Vøring Basin ◽  
Hybrid Event

Origin of carbonate-cemented beds on the Naglfar Dome, Vøring Basin, Norwegian Sea

2001 ◽  
Vol 18 (2) ◽  
pp. 223-234 ◽  
Author(s):  
M.B.E Mørk ◽  
D.A Leith ◽  
S Fanavoll
Keyword(s):  
Norwegian Sea ◽  
Vøring Basin

Formation of detrital clay grain coats by dewatering of deep-water sands and significance for reservoir quality

2019 ◽  
Vol 89 (12) ◽  
pp. 1231-1249 ◽  
Author(s):  
Kristin W. Porten ◽  
Michał J. Warchoł ◽  
Ian A. Kane
Keyword(s):  
Pore Space ◽  
Pore Fluid ◽  
High Density ◽  
Seafloor Topography ◽  
Abrupt Decrease ◽  
Norwegian Sea ◽  
Seabed Topography ◽  
Gravity Flows ◽  
Rapid Deceleration ◽  
Hybrid Event

ABSTRACT Well-developed detrital clay grain coats are observed in deep-marine sandstones of the Upper Cretaceous Springar Formation of the Vøring Basin in the Norwegian Sea. The detrital clay coats form thin and compact rims on individual sand grains and meniscus-shaped bridges between grains. These well-developed coats are found in high-density turbidites and proximal hybrid event beds with common to pervasive dewatering structures deposited in proximity to the base of a syndepositionally active basin high. Here, in one exploration well, detrital clay grain coats are common throughout a sandstone package 100 m thick. High-density turbidites and proximal and distal hybrid event beds drilled in mid- to distal-fan settings unaffected by seismically resolved seafloor topography show common dewatering features, but have only scattered detrital clay coats confined to individual dewatering pipes or dish structures. Hence, we propose that intense sediment dewatering has the potential to form detrital clay coats in deep-marine sandstones by a combination of elutriation and reorganization of clays during fluid escape from sediment bodies with pore fluid pressures significantly higher than the hydrostatic pressure. In submarine fan systems, deposition of sediment with coeval trapping of large volumes of interstitial pore fluid is most likely to occur where gravity flows undergo rapid deceleration in response to an abrupt decrease in confinement or gradient. Such environments include the channel–lobe transition and settings in proximity to seabed topography. The investigated sandstones are quartz arenites and subarkoses, with minor to moderate volumes of quartz cement (up to 6%). However, strongly to completely quartz-cemented intergranular pore space is observed where detrital clay coats or matrix does not cover quartz grains in the deepest part of the studied formation. Modeling of quartz cementation predicts that most intergranular macroporosity in the lower part of the Springar Formation would be quartz cemented if the sandstones were free of detrital clays. Based on our observations and modeling results we propose that intense sediment dewatering has the potential to form detrital clay coats, which can be important for retaining porosity in deeply buried sandstones and in basins with high present or past heat flow.

Possible climatic agencies in the development of post-Glacial habitats

1965 ◽  
Vol 161 (984) ◽  
pp. 363-375 ◽  
Keyword(s):  
Quantitative Data ◽  
North China ◽  
The Sun ◽  
Scientific Objective ◽  
Satisfactory Explanation ◽  
Climatic Fluctuations ◽  
Norwegian Sea ◽  
North West ◽  
The Many ◽  
Immediate Reactions

For the meteorologist the elucidation of the reasons for past climatic fluctuations or changes must be a major scientific objective in order that he may be better placed with regard to the future. But before he can attempt a satisfactory explanation of past climatic events, great or small, he must be provided with quantitative data. He must know the magnitude, the extent and the time of incidence of the phenomena. We are acutely in need of more accurate dating of the events whose effects are brought to our notice by botanical evidence. We need to know their spatial extent because we can readily think of events affecting the sun which would be likely to produce immediate reactions over the whole earth. But we can equally readily think of others, such as the freezing of the Norwegian Sea that would very rapidly affect the climate and the vegetation of the coast of Norway but would, at best, make but a slight impression on that of a distant area such as the plain of north China. Accordingly, the meteorologist finds himself immediately interested in the quite notable changes represented by the recurrence-surfaces in the bogs of north-west Europe. Twenty years have passed since van Post (1944) described the results of the many pollen-analytical investigations up to that time as ‘a kaleidoscopic synthesis of larger and smaller climatic waves’. He was disposed to think that period lengths of approximately 1700 years, 800 to 900 years and about 400 or 200 years might be deduced for the undulations of climate. But he went on to say that ‘if the facts appear to agree approximately, then the theory becomes positively dangerous for it may tempt us to wishful thinking that obscures our vision of the empirical realities’. It is with some of these realities that I propose to deal.

scholarly journals Possibilities of laser location for remote monitoring of marine organisms (analytic review)

2014 ◽  
Vol 176 (1) ◽  
pp. 261-287
Author(s):  
Valery I. Kudryavtsev
Keyword(s):  
Fish Species ◽  
Wave Length ◽  
Gulf Of Alaska ◽  
Airborne Lidar ◽  
Norwegian Sea ◽  
North West ◽  
Fish Schools ◽  
North East ◽  
The North ◽  
Analytic Review

Possibilities of lidar detection of fish and plankton are overviewed on cited results of nature experiments in the sea. Volume-backscattering coefficients for the lidar with wave-length 532 nm and the acoustic sonar are compared for schools of some fish species. Examples of effective detecting of fish schools and assessment of their abundance by lidar are demonstrated for cases of sardine and anchovy at California coast, capelin and herring in the North Pacific, mullet at the west coast of Florida, juvenile mackerel in the coastal Atlantic waters of southern Europe, menhaden in the Chesapeake Bay, and others. In some experiments, the per-kilometer costs of airborne lidar surveys are estimated as 10 % or less as compared to ship-based sampling. Besides, the lidar surveys take a shorter time and their results are not distorted by avoidance behavior of fish caused by ship and sampling gear noises. Experimental surveys of thin scattering layers (probably formed by plankton) made by NOAA fish lidar are overviewed, as well, including the first tests of the system in the South California Bay in April 1997, the tests in the North-West Atlantic at Iberian coast in August-September 1998, in the Gulf of Alaska in July-September 2001 and May-August 2002, in the Norwegian Sea in July 2002, in the North-East Pacific at the coast of Oregon and Washington in July 2003, and in the Gulf of Alaska in July 2003. Some aspects of future development for improvement of school-detecting capabilities of lidar are discussed, as additional scanning for 2D-images and adding of second receiver co-polarized with the laser light for better identification of fish species and other scatterers in the sea.

XVIII.—Recent Oceanographical Investigations in the Faroe-Shetland Channel

1957 ◽  
Vol 64 (3) ◽  
pp. 239-289 ◽  
Author(s):  
John B. Tait
Keyword(s):  
Cross Sections ◽  
Large Scale ◽  
Water Mass ◽  
Sea Water ◽  
Volume Transport ◽  
Oceanic Water ◽  
Arctic Water ◽  
Norwegian Sea ◽  
North West ◽  
The North

SynopsisThe Faroe-Shetland Channel is the threshold from the north-eastern Atlantic Ocean to north-west European seas. Through it passes the main bulk of the oceanic water-mass which is the predominant influx, among several other water-masses, to these seas.The following research into the dynamics and general hydrography of the region is based on numerous observations of temperature and salinity, from surface to bottom, taken mainly on two vertical cross-sections of the Channel between the years 1927 and 1952 inclusive, excepting the war years 1940 to 1945.The research reveals very large scale seasonal and long-term variations in the northeastward volume-transport of oceanic water, suggests the existence on occasions of what appear to be horizontal tortional currents within the oceanic water-mass, and demonstrates (a) the intrusion of Gulf of Gibraltar (extra-Mediterranean) water into this mass over a period of years, (b) the formation of heavy oceanic water and (c) of a sub-oceanic watermass. The last-mentioned may sometimes almost entirely displace the bottom Norwegian Sea water-mass which normally underlies the oceanic mass.One or other, or both, of two types of Arctic water may also sometimes displace bottom Norwegian Sea water as the bottom water-mass of the region, the process, like that of the above-mentioned Gulf of Gibraltar water influx, waxing and waning over a term of years and thus exemplifying the phenomenon of marine climatic change.

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