Stable isotope evidence for meter-scale sea level changes in Lower Cretaceous inner platform and pelagic carbonate successions of Turkey

In this study, stable C and O isotope compositions of bulk rock samples from Barremian-Aptian platform carbonates of the Taurides, the Pontides, and of their pelagic counterparts of the Sakarya continent in Turkey were measured for the first time. Platform carbonates and pelagic successions including a prominent black shale interval are composed of distinct sedimentary cycles in the form of meter-scale shallowing-upward sequences and limestone-marl/ shale couplets, respectively. The biostratigraphy and the delta(13)C values allow this black shale interval to be correlated with the "Selli level". Variations in lithofacies and delta(13)C and delta(18)O values with the magnitudes of about 2parts per thousand within the cycles indicate high frequency fluctuations in sea level, probably in response to alternate periods of cooling and warming occurring on Milankovitch-cycle scales even during the greenhouse-type Cretaceous. A good overall correlation between sedimentary cyclicity and variations in delta(18)O values suggests preservation of the primary isotopic signal.


Sedimentology and stratigraphy of türbeyanı marl sequences and inpiri limestones (late barremian-albian) : implications for possible source and reservoir rocks (nw Turkey)
Nabiyev, Anar; Yılmaz, İsmail Ömer; Department of Geological Engineering (2007)
Sedimentology, cyclostratigraphy and sequence stratigraphy of the Türbeyanı Marls (Albian) and the İnpiri Limestone (Upper Barremian-Albian) members of Ulus Formation (İnciğez, Bartın, Amasra) were interpreted in this study. In the Türbeyanı Marls total of five different facies were defined. Marl and limestone facies are the most abundant in the succession. The depositional environment of the succession was defined as an outer shelf area. Within the pelagic marls 39 smaller order and 9 higher order cycles w...
Stable isotope-based reconstruction of Oligo-Miocene paleoenvironment and paleohydrology of Central Anatolian lake basins (Turkey)
Luedecke, Tina; Mikes, Tamas; Rojay, Fuat Bora; Cosca, Michael A.; Mulch, Andreas (The Scientific and Technological Research Council of Turkey, 2013-01-01)
Isotope geochemistry of lacustrine carbonate represents a powerful tool to reconstruct paleoclimatic and paleoenvironmental conditions. Here, we present a comprehensive set of long-term oxygen (delta O-18) and carbon (delta C-13) stable isotope records from 5 Chattian to Burdigalian lacustrine sequences distributed over the Central Anatolian Plateau. Field relationships combined with stable isotope geochemistry indicate a relatively humid subtropic Late Oligocene climate with an environment characterized by...
CO2 outburst events in relation to seismicity: Constraints from microscale geochronology, geochemistry of late Quaternary vein carbonates, SW Turkey
UENAL-IMER, Ezgi; UYSAL, I. Tonguc; ZHAO, Jian-Xin; Isik, Veysel; SHULMEISTER, James; İmer, Ali; FENG, Yue-Xing (2016-08-15)
Vein and breccia carbonates precipitated in a highly fractured/faulted carbonate bedrock in SW Turkey were investigated through high-resolution U-series geochronology, microstructural and geochemical studies including C-O-Sr isotope and rare-earth element and yttrium (REY) analyses. Petrographical observations and geochronological data are interpreted as evidence that the calcite veins formed through a crack-seal mechanism, mostly accompanied/initiated by intensive hydraulic fracturing of the host limestone...
Middle Jurassic Lower Cretaceous biostratigraphy in the Central Pontides (Turkey): Remarks on paleogeography and tectonic evolution
Rojay, Fuat Bora; Altıner, Demir (1998-08-01)
The deposition of Jurassic-Lower Cretaceous carbonates in the Pontides was controlled mainly by the evolution of an Atlantic-type continental margin in the Tethys. The study of several stratigraphic sections from allochthonous slices and blocks of the North Anatolian Ophiolitic Melange provided insight into the Middle Jurassic-Early Cretaceous paleogeographic evolution of the Central Pontide Belt. The Callovian-Aptian successions span the Globuligerina gr. oxfordiana, Clypeina jurassica (equivalent of the T...
Size distribution of trace elements and major ions in the eastern Mediterranean atmosphere
Kuloglu, E; Tuncel, Süleyman Gürdal (2005-10-01)
Size distribution of trace elements is measured at the Mediterranean coast of Turkey, by analyzing hi-vol impactor samples collected between August 1993 and May 1994. Mass median diameters of marine elements are between 4.6 and 5.3 mu m, and those of crustal elements are between 3.0 and 3.5 mu m. Mass median diameters of crustal elements are 30% smaller in samples impacted by Saharan Dust. Pollution derived elements, As, Cd, Mo, Pb, Se, and Zn have MMD's between 1.25 and 1.01 mu m. Although 70-90% of the ma...
Citation Formats
İ. Ö. Yılmaz and D. Altıner, “Stable isotope evidence for meter-scale sea level changes in Lower Cretaceous inner platform and pelagic carbonate successions of Turkey,” GEOLOGICA CARPATHICA, pp. 19–36, 2004, Accessed: 00, 2020. [Online]. Available: