Atlantic-type margin definition forex

atlantic-type margin definition forex

These models operate under a steady state assumption, meaning Continental and proximal margin εNd map, showing (a) sample type and εNd. The geomorphic features were defined using Geoscience Australia's national Figure 3 Spatial distribution of the different types of bathymetry data used. However, in an area between chron 24 and the Eurasian continental slope, the type of underlying crust is unknown. Seafloor spreading probably started some. REVIEWS ABOUT FOREX IN RUSSIA AnyDesk Remote Desktop. Other self-service portal X11 permissions are the problem do off-the-shelf CPUs and used as a deployment, pre-built or the race track. This could allow option specifies which.

Here, the gravity data suggest that the glacial fan extends well north of the m isobath. In the Nansen Basin a maximum thickness of 4. This is the first reliable determination for the sediment thickness of the Nansen Basin close to the northern Svalbard continental margin. In this area none of these anomalies coincides with a large glacial trough mouth fan. Instead, the gravity anomalies more probably reflect the deeper structure of the northern margin of Svalbard.

Gravity modelling shows that this anomaly cannot be explained by the basement topography observed on the profiles. Most of the anomaly is a consequence of a density contrast at deeper levels, between the continental crust in the south and the rifted or oceanic crust in the north. It would especially useful to understand the nature of the gravity lows between the positive anomalies Fig.

However, at the time of the survey the gravity grid was not available, and the survey was not designed to address it. On the basis of the seismic data from this study and former investigations Eiken , ; Baturin ; Weigelt , we compiled a structural map of the continental margin Fig. The southern Yermak Plateau is characterized by horst and graben structures. The acoustic basement maybe older than 35 Ma is masked locally by strong, opaque reflectors and is partly heavily faulted.

These opaque reflectors possibly represent lava flows connected with extensive volcanism during the formation of the northern part of the plateau. There are indications from seismic and gravity data that, in some places, sedimentary deposits also rest beneath these reflectors. Some of the faults on the southern Yermak Plateau cut through the young sediments near the seafloor.

Our gravity modelling supports previous assumptions e. Along the seismic refraction line a crustal thickness of approximately 22 km is reported, which fits reasonably well with our gravity modelling. The modelled average crustal density in this region is higher than in the adjacent shelf areas, suggesting that this part of the crust was heavily modified by mafic intrusions.

Between the Yermak Plateau and the island of Spitsbergen, there is a narrow 40—50 km wide basin, more than 11 km deep—the Sophia Basin. Beneath about 9 km of sedimentary rocks, we assume a relatively thin and dense crust with an affinity to oceanic crust. North of the Sophia Basin, at the southern rim of the northeastern Yermak Plateau we assume again thinned and modified continental crust from gravity modelling.

We speculate that possibly also large parts of the northern Yermak Plateau consist of former continental crust. We suggest that the observed high magnetic amplitudes along the northern Yermak Plateau are caused by intrusive and extrusive magmatic material. Compared with geological structures north of Spitsbergen, the margin north of Nordaustlandet apparently exhibits a less complex structure.

The area of crustal thinning is about 80 to km wide. Northwards, the transitional crust is bounded by an up to 20 km wide system of normal faults Fig. We assume that this fault system marks the transition to oceanic crust within the Nansen Basin. This assumption is supported by the results of gravity modelling in this study. The thickness of the oceanic crust in the Nansen Basin is about 5 to 8 km adjacent to the margin.

The structure of the conjugate continental margin north of Spitsbergen and Nordaustlandet is important for the plate tectonic reconstruction of the northeastern Yermak Plateau. The hinge line, named Moffen Fault Eiken , is displaced to the north by more than km in the area of Hinlopen Strait.

In this way, most of the northeastern Yermak Plateau may be reconstructed to the continental margin without significant overlap. Consequently, the core of the Yermak Plateau might consist of heavily modified continental rocks. However, this implies a different extensional history for the Yermak Plateau in the parts west and east of the north—south running fault east of Nansen Bank Fig.

The new Arctic gravity grid Fig. No such sequences are visible in the seismic data of this study. We cannot, however, exclude the presence of smaller volcanic complexes. Moreover, the gravity field does not show a continuous marginal anomaly. Instead, the mapped faults are associated with a strong, segmented gravity anomaly located within the continent—ocean transition zone. Deep seismic sounding profiles are needed in this area to make progress in understanding the tectonic evolution of this region and to confirm this interpretation.

The sedimentary cover below the continental shelf and slope is also highly variable in thickness, which ranges between 0 and 3 km. The data clearly indicate that the shape of the continental margin is highly variable in this region. In large areas, slumping and erosional processes within the sedimentary column dominate this margin.

Here, the topography of the slope is quite rough. Shelf progradation is only evident in the vicinity of troughs crossing the shelf. The seismic data support the interpretation that the main sedimentary input into the Nansen Basin during the Late Cenozoic occurred along the glacial troughs of the ice streams. In between the troughs, local sediment transport processes connected with a minor amount of sediments dominate the shelf.

The seismic profiles indicate that the anomalies are not consequences of huge glacial deposits. There are significant structural differences between the margins north of Spitsbergen affected by the evolution of the Yermak Plateau—diffuse rifting and north of Nordaustlandet normal rifting. The continent—ocean boundary north of Nordaustlandet is located farther to the north than previously assumed.

The continent—ocean transition appears to be a zone approximately km wide below the shelf. No magnetic anomalies are identified between Yermak Plateau and the continental margin of northern Svalbard. The crust within this zone probably consists of thinned and modified continental crust. This interpretation is supported by a dredge sample from the southern flank of the plateau, which represents a piece of continental rock. Major continental boundary faults exist below the continental slope.

The results of gravity modelling support the assumption that these faults mark the continent—ocean boundary. This is in accordance with recent deep seismic results across the southern Yermak Plateau, where no evidence was found for the existence of a massive underplating of that region. No strong magnetic anomalies are identified between the Yermak Plateau and the continental margin of northern Svalbard. We are grateful for the excellent support of the captain and crew of the vessel RV Polarstern.

We thank two anonymous reviewers for their comments, which significantly improved the paper. This research has been partly funded by the Studienstiftung des Deutschen Volkes. Austegard A. Sundvor E. Bart P. Anderson J. Barker P. Brancolini G. Baturin D. Fedukhina T. Savostin L. Yunov A. A geophysical survey of the Spitsbergen margin and surrounding areas , Mar. Google Scholar. Butt F. Elverhoi A.

Solheim A. Forsberg C. Molotkov I. Google Preview. Cherkis N. Max M. Vogt P. Crane K. Midthassel A. Eldholm O. Myhre A. Thermal implications for the evolution of the Spitsbergen Transform Fault , Tectonophysics , 89 , 1 — Czuba W. Grad M. Guterch A. Eiken O. Bergsager E. Holter E. Johansen B. Lie E. Lund T. Telephone Fax , Amsterdam. Telephone Fax , Oslo. Hinz K. Contourites in the Fram Strait , Sediment.

Faleide J. Fiedler A. Hjelstuen B. Andersen E. Vanneste K. Feden R. Fleming H. Cenozoic sedimentation along the southwestern Barents Sea margin in relation to uplift and erosion of the shelf , Global and Planetary Change , 12 , 75 — Jansen E. Channell J. The depositional environment of the western Svalbard margin during the late Pliocene and the Pleistocene: Sedimentary facies changes at Site , in Proc. Blum P. Herbert T. Gardner G. Gardner L. Gregory A. Formation velocity and density—the diagnostic basics for stratigraphic traps , Geophysics , 39 , — Harland W.

The Geology of Svalbard , Geol. Hellebrand E. Jokat W. Telephone Fax Hull D. Osterman L. Thiede J. Firth J. Johnson G. Ruddiman W. IRIS , Jackson H. The Yermak Plateau: formed at a triple junction , J. Jakobsson M. Woodward J. Macnab R. Coakley B. Weigelt E. Kristoffersen Y. Rasmussen T. Karasik A. Methods Prospect. MacNab R. Verhoef J. The margin between Senja and Spitsbergen Fracture Zones: Implications from plate tectonics , Tectonophysics , 89 , 33 — Okay N.

Thermal Rejuvenation of the Yermak Plateau , Mar. Ritzmann O. Shipboard Scientific Party , Site , in Proc. Sroda P. Zelt , Polish Academy of Sciences, Warsaw. Stein R. Brass G. Graham D. Pimmel A. Telephone Fax , Dordrecht. Gidskehaug A. Martinez F. Jones C. DeMoustier C. Doss H. Shor A. Rognstad M. Dong S. Johnson D. Bergensen D. Taylor P. Kovacs L. Detailed aeromagnetic investigations of the Arctic Basin , J. Bernero C. Structure and plate tectonic evolution of the marine Arctic as revealed by aeromagnetics, 26th Internat.

Acta, 4 SP , 25 — Wessel P. Smith W. Zelt C. Sroda, Warsaw Smith R. Oxford University Press is a department of the University of Oxford. It furthers the University's objective of excellence in research, scholarship, and education by publishing worldwide. Sign In or Create an Account. Sign In. Advanced Search. Search Menu.

Article Navigation. Close mobile search navigation Article Navigation. Volume Article Contents Summary. Data Acquisition, Processing and Modelling Procedure. Interpretation and Discussion. Next, discuss the course of action you will take if the broker does not adequately answer your questions or provide a withdrawal. Steps may include posting comments online or reporting the broker to FINRA or the appropriate regulatory body in your country.

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Stock Brokers. Your Money. Personal Finance. Your Practice. Popular Courses. Table of Contents Expand. Table of Contents. Separating Forex Fact From Fiction. Communication Is Key. Broker Research Protects You. The Temptation to Churn. SEC Defines Churning. Evaluate Your Trades. How Regulators Evaluate Churning. Already Stuck With a Bad Broker?

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Forex Broker Definition A forex broker is a financial services firm that offers its clients the ability to trade foreign currencies. Forex is short for foreign exchange. What Is Margin? Margin is the money borrowed from a broker to purchase an investment and is the difference between the total value of the investment and the loan amount. Brokerage Account A brokerage account is an arrangement that allows an investor to deposit funds and place investment orders with a licensed brokerage firm.

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