Basement structure and architecture of the Black Sea Basin

2018-01-28
Kaymakcı, Nuretdin
Horn, Brian
Black Sea consists of two separate back arc basins which opened at different times during the Cretaceous in response to northward subduction of the Neo-Tethys Ocean. The paucity of well data, complex geometries and seismic imaging challenges mean that questions remain regarding the basement architecture though most authors accept that, at least in part, both these basins are floored by oceanic crust, even though there are no magnetic stripes. Interpretation of deep, long offset seismic data (imaging to more than 35km) support that the presence of oceanic crust in large parts of Eastern Black Sea basin while oceanic crust is present only in the northeastern part of the western Black Sea Basin. We investigate the architecture of the transitional zone between continental and oceanic realms and how it changes across the Black Sea. We note the absence of seaward dipping reflectors and only limited areas where there is good evidence for exposure of sub-continental mantle and discuss the implications this may have on the nature of Black Sea opening within the regional tectonic framework. The Black Sea is surrounded by fold and thrust belts mainly in its eastern and northern parts while extensional and strike-slip faults dominate in the west and southwest respectively. There is well-imaged evidence that suggest that the beginnings of subduction of the western Black Sea oceanic crust beneath a part of the mid Black Sea high, and that the original oblique outer marginal detachment on which the ocean opened is beginning to be inverted as a subduction zone with contractional deformation of the volcano-sedimentary pile in the outer marginal trough. The most recent structures along the Black Sea basin characterized by small extensional faults developed along the southern margin and the western margin is dominated by extensional structures and gravity tectonics related to the Danube Delta. Except along its western margin, the eastern Black sea is dominated by an actively developing fold-thrust belts and piggy-back basins almost parallel to the coastline (Tuapse and Sorokin troughs). Compressional structures are generally thin-skinned and constrained to a narrow belt close to shore line. No major recent compressional structures are observed in the deeper parts of basin, implying that Black Sea crust is stronger than the surrounding continental blocks and behaves as a rigid block constraining deformation along its margins.
EGU General Assembly 2017, 23–28 April 2017

Suggestions

Vertical distribution of marine cyanobacteria Synechococcus spp. in the Black, Marmara, Aegean, and eastern Mediterranean seas
Uysal, Zahit (2006-01-01)
The vertical distributions of the unicellular cyanobacteria Synechococcus were studied in several highly contrasting seas: the Black Sea, Sea of Marmara, Aegean Sea, and Mediterranean Sea. Cell abundances varied significantly on both vertical and horizontal scales in all physically and spatially discrete water masses. Epifluorescence microscope cell counts from all seas clearly showed that majority of the population remains suspended in the surface-mixed layer and decreases gradually towards the base of the...
Trace metal composition of particulate matter of the Danube River and Turkish rivers draining into the Black Sea
Yigiterhan, Oguz; Murray, James W. (2008-08-16)
We determined the composition of particles from several rivers entering the Black Sea as part of a broader study of the composition of suspended matter and sediments in the Black Sea. Suspended matter and surface sediment samples were collected from the Danube River draining from Europe and from four Turkish rivers (Sakarya, Yenice (Filyos), Kizilirmak and Yesilirmak Rivers) in Anatolia. All samples were digested and analyzed by inductively coupled plasma-mass spectrometry and atomic absorption spectrometry...
The Unaz Formation: A Key Unit in the Western Black Sea Region, N Turkey
Tuysuz, Okan; Yılmaz, İsmail Ömer; Svabenicka, Lilian; Kirici, Sabri (2012-01-01)
The Pontide magmatic belt in the Western Pontides, which developed in response to the northward subduction of the northern branches of the Tethys Ocean, consists of two different volcanic successions separated by an Upper Santonian pelagic limestone unit, the Unaz Formation. The first period of volcanism and associated sedimentation started during the Middle Turonian and lasted until the Early Santonian under the control of an extensional tectonic regime, which created horst-graben topography along the sout...
Tectonic history of basins sited along the western section of the North Anatolian Fault System, Turkey
SARP, Gülcan; Gurboga, Sule; Toprak, Vedat; Duzgun, Sebnem (2014-01-01)
Geological and geomorphological features of basins along the western half of the North Anatolian Fault System (NAFS) are used to constrain the formation of these basins by localization of deformation and the total displacement, and to determine the timing of basin development. In this study, tectonic influence direction of the NAFS on tectonic and hydrologic basins Bolu, Yenicaga, Dortdivan, Cerkes, Ilgaz and Tosya has been investigated to deduce information about the formation stages and interaction betwee...
Continuous resistivity profiling survey in Mersin Harbour, Northeastern Mediterranean Sea
OKYAR, Mahmut; YILMAZ, Sedat; Tezcan, Devrim; Cavas, Hakan (2013-06-01)
No detailed information has previously been available on the geological and geophysical characteristics of the sea floor and the underlying strata of Mersin Harbour, Northeastern Mediterranean Sea (Turkey). Continuous resistivity profiling (CRP) and borehole data from Mersin Harbour were used to interpret geoelectric stratigraphy of Neogene-Quaternary sediments in the area. This represents one of few such detailed case studies that have applied these valuable CRP techniques for the purpose of marine stratig...
Citation Formats
N. Kaymakcı and B. Horn, “Basement structure and architecture of the Black Sea Basin,” presented at the EGU General Assembly 2017, 23–28 April 2017, Vienna, Austria, 2018, Accessed: 00, 2021. [Online]. Available: https://hdl.handle.net/11511/87931.