Upper Quaternary water level history and sedimentation in the northwestern Black Sea

Winguth, Cornelia; Wong, Heung‐wah; Panin, Nicolae; Dinu, C.; Georgescu, P.; Ungureanu, Gheorghe-Viorel; Krugliakov, V.V; Podshuveit, V

doi:10.1016/s0025-3227(00)00024-4

Cited by 83 publications

(90 citation statements)

References 15 publications

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“…Since the terrace is located in a paleo-delta environment this hypothesis can indeed be valid, were it not that the water level would have had to be 180 m below current water level. This is 30 m lower than the lowest value proposed in literature for the last lowstand in the Black Sea (Winguth et al, 2000). Peckmann et al (2001) have dated carbonates from the terrace with an age of 19 ka BP.…”

Section: Terracementioning

confidence: 53%

“…The northwestern Black Sea is dominated by a rather wide shelf (60-200 km) with a shelf break at 120 to 170 m water depth and canyon systems with large deepsea fan complexes, mainly developed during sea level lowstands (Winguth et al, 2000;Popescu et al, 2001). The main canyon systems in the western Black Sea are the Danube and Dnepr Canyons, each with their own typical morphology.…”

Section: Study Areamentioning

confidence: 99%

“…The deep-sea fans, related to these canyon systems, are fed by sediment input from the Danube River (Central Europe) and the Dnepr, Dnestr and Bug Rivers (Eastern Europe). At present the Dnepr, Dnestr and Bug discharge their sediment loads into a lagoonal system separated from the Black Sea by beach barriers, and only a small fraction of the suspended load reaches the sea (Winguth et al, 2000). During the last lowstand the Dnepr and Danube flowed hundreds of kilometers beyond there present mouths depositing organic-rich material and forming shelf-edge deltas at the present-day shelf break (Ryan et al, 1997).…”

Section: Study Areamentioning

confidence: 99%

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Geological and morphological setting of 2778 methane seeps in the Dnepr paleo-delta, northwestern Black Sea

et al. 2006

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The Dnepr paleo-delta area in the NW Black Sea is characterized by an abundant presence of methane seeps. During the expeditions of May-June 2003 and within the EU-funded CRIMEA project, detailed multibeam, seismic and hydro-acoustic water-column investigations were carried out to study the relation between the spatial distribution of methane seeps, sea-floor morphology and sub-surface structures.2778 new methane seeps were detected on echosounding records in an area of 1540 km 2 . All seeps are located in the transition zone between the continental shelf and slope, in water depths of 66 to 825 m. The integration of the different geophysical datasets clearly indicates that methane seeps are not randomly distributed in this area, but are concentrated in specific locations.The depth limit for the majority of the detected seeps is 725 m water depth, which corresponds more or less with the stability limit for pure methane hydrate at the ambient bottom temperature (8.9 8C) in this part of the Black Sea. This suggests that, where gas hydrates are stable, they play the role of buffer for the upward migration of methane gas and thus prevent seepage of methane bubbles into the water column.Higher up on the margin, gas seeps are widespread, but accurate mapping illustrates that seeps occur preferentially in association with particular morphological and sub-surface features. On the shelf, the highest concentration of seeps is found in elongated depressions (pockmarks) above the margins of filled channels. On the continental slope where no pockmarks have been observed, seepage occurs along crests of sedimentary ridges. There, seepage is focussed by a parallel-stratified sediment cover that thins out towards the ridge crests. On the slope, seepage also appears in the vicinity of canyons (bottom, flanks and margins) or near the scarps of submarine landslides where mass-wasting breaches the fine-grained sediment cover that acts as a stratigraphic seal. The seismic data show the presence of a distinct bgas front,Q which has been used to map the depth of the free gas within the sea-floor sediments. The depth of this gas front is variable and locally domes up to the sea floor. Where the gas front approaches the seafloor, gas bubbles were detected in the water column. A regional map of the sub-surface depth of the gas front emphasises this bgas front-versus-seepQ relationship. The integration of all data sets indicates that the spatial distribution of methane seeps in the Dnepr paleo-delta is mainly controlled by the gas-hydrate stability zone as well as by stratigraphic and sedimentary factors. D

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Section: Terracementioning

confidence: 53%

Section: Study Areamentioning

confidence: 99%

Section: Study Areamentioning

confidence: 99%

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Geological and morphological setting of 2778 methane seeps in the Dnepr paleo-delta, northwestern Black Sea

et al. 2006

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“…Under some specific circulation conditions (Stanev et al 2007), the Danube plume is entrapped by an anticyclonic shelf-gyre extending to the north. Average sedimentation rates for the Upper Quaternary range between 1.19 and 2.19 m ka −1 for the Danube fan and between 1.07 and 2.03 m ka −1 for the Dnieper fan (Winguth et al 2000). These values are much higher than in other Mediterranean basins, which is caused by the large drainage area of the Black Sea.…”

Section: Introductionmentioning

confidence: 90%

Sediment dynamics in the Black Sea: numerical modelling and remote sensing observations

Stanev

Kandilarov

2012

Ocean Dynamics

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Here, we address the sediment dynamics in the Black Sea based on analysis of remote sensing data from the Medium Resolution Imaging Spectrometer and numerical simulations with Nucleus for European Modelling of the Ocean model. Boundary conditions consist of realistic meteorological forcing, including significant wave height generated by wave prediction model. A number of sensitivity runs was analysed with the aim to find the most suitable parameters governing sediment fluxes. The comparison between numerical simulations and remote sensing data gives credibility to the quality of simulations. The combined effect of wind waves and currents in the bed layer controls the sediment resuspension that appears to be the major basin-wide source of sediment. Sensitivity experiments included or excluded different forcing terms, e.g. sediment flux from rivers enable to determine the spatial extensions of different point sources. It is concluded that wind-wave forcing is manifested in the sediment dynamics through episodic high energy events con-

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“…The initial exposure of the shelf margin triggered instability and failure of the outer shelf and slope, generating gravitational gliding and mass transport of sediments toward the deep-sea part of the basin [Dinu et al, 2005;Ţambrea, 2007]. Rapid sea level changes are also inferred for the Pliocene-Quaternary endemic evolution of the Western Black Sea [Winguth et al, 2000;Lericolais et al, 2009], when sea level drops triggered the transport of important volumes of sediments toward the deep-sea part of the basin. Consequently, thick successions of mass-transport and turbiditic deposits are observed along a number of deep-sea fans in front of modern rivers discharging into the Black Sea [e.g., Popescu et al, 2001].…”

Section: Constraints On the Opening And Inversion Of The Western Blacmentioning

confidence: 99%

Kinematics of back‐arc inversion of the Western Black Sea Basin

Munteanu

Maţenco²,

Dinu

et al. 2011

Tectonics

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[1] Back-arc basin evolution is driven by processes active at the main subduction zone typically assuming the transition from an extensional back-arc, during the retreat of a mature slab, to a contractional basin, during high-strain collisional processes. Such a transition is observed in the Black Sea, where the accurate quantification of shortening effects is hampered by the kinematically unclear geometries of Cenozoic inversion. By means of seismic profiles interpretation, quantified deformation features and associated syn-tectonic geometries on the Romanian offshore, this study demonstrates that uplifted areas, observed by exploration studies, form a coherent thick-skinned thrust system with N-ward vergence. Thrusting inverted an existing geometry made up by successive grabens that were inherited from the Cretaceous extensional evolution. The shortening started during late Eocene times and gradually affected all areas of the Western Black Sea Basin during Oligocene and Miocene times, deformation being coherently correlated across its western margin. The mechanism of this generalized inversion is the transmission of stresses during the collision recorded in the Pontides-Balkanides system. Syn-tectonic sedimentation in the Western Black Sea demonstrates that this process was continuous and took place through the onset of gradual shortening migrating northward. Although the total amount of shortening is roughly constant in an E-W direction, individual thrusts have variable offsets, deformation being transferred between structures located at distance across the strike of the system. The Black Sea example demonstrates that the vergence and offset of thrusts can change rapidly along the strike of such a compressional back-arc system. This generates apparently contrasting geometries that accommodate the same orogenic shortening.

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Upper Quaternary water level history and sedimentation in the northwestern Black Sea

Cited by 83 publications

References 15 publications

Geological and morphological setting of 2778 methane seeps in the Dnepr paleo-delta, northwestern Black Sea

Geological and morphological setting of 2778 methane seeps in the Dnepr paleo-delta, northwestern Black Sea

Sediment dynamics in the Black Sea: numerical modelling and remote sensing observations

Kinematics of back‐arc inversion of the Western Black Sea Basin

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