نتایج جستجو برای: slope of deposited sediments
تعداد نتایج: 21170351 فیلتر نتایج به سال:
Abstract Submarine landslides and associated mass-transport deposits (MTDs) modify the physiography of continental margins influence evolution submarine sediment routing systems. Previous studies highlighted control MTDs on subsequent sedimentary processes at spatial scales ranging from tens centimeters to few kilometers, leaving a knowledge gap how for long large-scale (i.e., headscarps wider ...
Site U1318 (Proposal Site PORC-2A) is located in on the eastern slope of the Porcupine Seabight on the southwest continental margin of Ireland and is upslope from the Belgica Mound Province, including Challenger Mound. The principal objective at Site U1318 was to recover the sediments from the three seismic units (P1-3) of the southern Belgica mound province. Complete data from the seismically ...
The Indus fan is the most pronounced and extensive physiographic and sedimentary feature of the Arabian Sea as well as it is the second largest submarine fan in the world. It has developed off the passive continental margin of Pakistan and India, covering an area of about 1.1 x10 km which makes it one of the largest sediment bodies in the ocean basins, totalling ~5 x 10 km in volume. The presen...
Deposition of dredged harbor sediments in relatively undisturbed ecosystems is often considered a viable option for confinement of pollutants and possible natural attenuation. This study investigated the effects of deposition of heavy-metal-polluted sludge on the microbial diversity of sandy sediments during 12 months of mesocosm incubation. Geochemical analyses showed an initial increase in po...
Copyright © 2016 by The Geochemical Society of Japan. globally deposited methane hydrate is estimated to be ~100,000 Gt (Kvenvolden, 2002; Milkov, 2004), which is a potent energy resource. Since the major source of methane in the hydrate is of methanogen origin, investigation of distribution and activities of methanogens leads to deeper understanding of the starting point of methane hydrate for...
The rate of erosion is the product of the concentration of active soil aggregates and their mean vertical velocity. The sediment concentration for a given time is proportional to the probability of detachment of first-time mobilized soil aggregates and to the probability of the deposited sediments’ redetachment. The probability of soil aggregate activation is equal to the probability of the dri...
Zoophycos is a complex three dimensional trace fossil that is abundant in deep ocean sediments worldwide, but has not been described previously from Cenozoic continental margin deposits of Antarctica. In the ANDRILL 1B core drilled through the northwest McMurdo ice shelf, Zoophycos occurs in a 17m thick unit of interglacial sediments bounded above and below by glacial surfaces of erosion. This ...
Bacterial community structures were evaluated in oil samples using culture-independent pyrosequencing, including oil mousses collected on sea surface and salt marshes during the Deepwater Horizon oil spill, and oil deposited in sediments adjacent to the wellhead 1 year after the spill. Phylogenetic analysis suggested that Erythrobacter, Rhodovulum, Stappia, and Thalassospira of Alphaproteobacte...
New ages for flowstone, sediments and fossil bones from the Dinaledi Chamber are presented. We combined optically stimulated luminescence dating of sediments with U-Th and palaeomagnetic analyses of flowstones to establish that all sediments containing Homo naledi fossils can be allocated to a single stratigraphic entity (sub-unit 3b), interpreted to be deposited between 236 ka and 414 ka. This...
The amount of wrack deposited and retained on a beach may be affected by the beach’s morphology. Conversely, wrack deposits have the potential to modify sediment dynamics on the beach face through accumulation and erosion of sediments around wrack deposits, and the incorporation of organic matter into beach sands. The aims of this chapter were thus to determine whether beach morphology differed...
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