Dating of the Black Sea Basin: new nannoplankton ages from its inverted margin in the Central Pontides (Turkey)

Abstract The Eocene uplift and inversion of a part of the Black Sea margin in the Central Pontides, allows us to study the stratigraphic sequence of the Western Black Sea Basin (WBS). The revision of this sequence, with 164 nannoplankton ages, indicates that subsidence and rifting started in the Upper Barremian and accelerated during the Aptian. The rifting of the western Black Sea Basin lasted about 40 Ma (from late Barremian to Coniacian). In the inner, inverted, Black Sea margin, the syn-rift sequence ends up with shallow marine sands. The uppermost Albian to Turonian was a period of erosion or non deposition. This regional mid-Cretaceous stratigraphical gap might result from rift flank uplift, as expected in the case of a thick and cold pre-rift lithosphere. However, coeval collision of the Kargi Block, along the North Tethyan subduction zone at the southern margin of the Pontides, might also have contributed to this uplift. A rapid thermal post-rift subsidence of the margin occurred during the Coniacian–Santonian. Collision of the Kirşehir continental block commenced in Early Eocene time (zone NP12) giving rise to compressional deformation and sedimentation in piggyback basins in the Central Pontides, whereas the eastern Black Sea was still opening.

[1]  A. Şengör,et al.  Palaeotectonic evolution of the Tuzgölü basin complex, Central Turkey: sedimentary record of a Neo-Tethyan closure , 1984, Geological Society, London, Special Publications.

[2]  S. Cloetingh,et al.  Stratigraphic evolution of the Black Sea: inferences from basin modelling , 1995 .

[3]  Nuretdin Kaymakçi,et al.  Tectono-stratigraphical evolution of the Çankırı Basin (Central Anatolia, Turkey) , 2000 .

[4]  G. Sunal,et al.  Palaeostress analysis of Tertiary post-collisional structures in the Western Pontides, northern Turkey , 2002, Geological Magazine.

[5]  A. Şengör,et al.  Jurassic‐Cretaceous paleomagnetism and paleogeography of the Pontides (Turkey) , 1996 .

[6]  A. Robinson.  Regional and Petroleum Geology of the Black Sea and Surrounding Region , 1997 .

[7]  J. H. Rudat,et al.  Petroleum geology of the Black Sea , 1996 .

[8]  A. Okay.  Distribution and characteristics of the north-west Turkish blueschists , 1984, Geological Society, London, Special Publications.

[9]  P. Dijk,et al.  Palaeomagnetic evolution of the Çankırı Basin (central Anatolia, Turkey): implications for oroclinal bending due to indentation , 2003, Geological Magazine.

[10]  X. Pichon,et al.  Deep basins of the Black Sea and Caspian Sea as remnants of Mesozoic back-arc basins , 1986 .

[11]  J. Letouzey,et al.  Structure and Evolution of the Mediterranean Basins , 1978 .

[12]  OkanTuysuz Erdinc Yigitbas S. Can Genc Yucel Yilmaz,et al.  AAPG Memoir 68: Regional and Petroleum Geology of the Black Sea and Surrounding Region. Chapter 11: Geology and Tectonic Evolution of the Pontides , 1997 .

[13]  N. Görür,et al.  Cretaceous red pelagic carbonates of northern Turkey: their place in the opening history of the Black Sea , 1993 .

[14]  Nuretdin Kaymakçi,et al.  Kinematic and structural development of the Çankiri Basin (Central Anatolia, Turkey): a paleostress inversion study , 2003 .

[15]  K. Hsü,et al.  Geologic evolution of Bulgaria in light of plate tectonics , 1977 .

[16]  N. Görür.  Timing of opening of the Black Sea basin , 1988 .

[17]  J. Wees,et al.  Thermo-mechanical Modelling of Black Sea Basin (de)formation. , 2003 .

[18]  O. Tüysüz.  Tectonic evolution of a part of the Tethyside orogenic collage: The Kargi Massif, northern Turkey , 1990 .

[19]  A. Robinson.  Introduction: Tectonic Elements of the Black Sea Region , 1997 .

[20]  Y. Yılmaz,et al.  Pre-Cenozoic tectono-stratigraphic components of the Western Pontides and their geological evolution , 1999 .

[21]  D. Roberts.  Regional and petroleum geology of the Black Sea and surrounding region , 1998 .

[22]  E. Verzhbitsky,et al.  Age and Thickness of the Lithosphere within the Western and Eastern Basins of the Black Sea according to Geophysical Data , 2002 .

[23]  A. Şengör,et al.  Kinematic history of the opening of the Black Sea and its effect on the surrounding regions , 1994 .

[24]  A. Okay,et al.  Tethyan sutures of northern Turkey , 1999, Geological Society, London, Special Publications.

[25]  L. Jolivet,et al.  The Mediterranean Basins: Tertiary Extension within the Alpine Orogen — an introduction , 1999, Geological Society, London, Special Publications.

[26]  R. Kerrich,et al.  Characteristics and geochemistry of Precambrian ophiolites and related volcanics from the Istanbul–Zonguldak Unit, Northwestern Anatolia, Turkey: following the missing chain of the Precambrian South European suture zone to the east , 2004 .

[27]  B. Burchfiel,et al.  Geology of Romania , 1974 .

[28]  D. Altıner,et al.  Cretaceous and Triassic subduction-accretion, high-pressure- low-temperature metamorphism, and continental growth in the Central Pontides, Turkey , 2006 .

[29]  G. Lister,et al.  Relative motions of Africa, Iberia and Europe during Alpine orogeny , 2002 .

[30]  M. Brunet,et al.  The Black Sea basin: tectonic history and Neogene–Quaternary rapid subsidence modelling , 2003 .

[31]  J. Angelier,et al.  Tectonic-stratigraphic record of paleostress time changes in the Oligocene basins of the Provence, southern France , 1993 .

[32]  A. Robinson,et al.  Western versus Eastern Black Sea tectonic evolution: pre-rift lithospheric controls on basin formation , 1996 .

[33]  Ali Altiner.  Tectonostratigraphic Evolution of the North Anatolian Palaeorift (NAPR): Hettangian-Aptian Passive Continental Margin of the Northern Neo-Tethys, Turkey , 2002 .

[34]  A. Robertson,et al.  AAPG Memoir 68: Regional and Petroleum Geology of the Black Sea and Surrounding Region. Chapter 14: Tectonic-Sedimentary Evolution of the North Tethyan Margin in the Central Pontides of Northern Turkey , 1997 .

[35]  E. Yiitba.  Characteristics and geochemistry of Precambrian ophiolites and related volcanics from the Istanbul?Zonguldak Unit, Northwestern Anatolia, Turkey: following the missing chain of the Precambrian South European suture zone to the east , 2004 .

[36]  O. Tüysüz.  Geology of the Cretaceous sedimentary basins of the Western Pontides , 1999 .