Orbitally-driven Mid-Burdigalian Coastal Sabkha cycles from the Sivas Basin: Sedimentological, paleontological, and geochemical data

Date

2018-01-15

Author

OCAKOĞLU, FARUK
Yavuz, Nurdan
Aydln, Aysegul
Yılmaz, İsmail Ömer

Metadata

Show full item record

This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Item Usage Stats

117
views

0
downloads

The Early to Middle Miocene period in the Sivas Basin is represented by a thick deposition of mud-dominated marine sediments (Karacaoren Formation) in an overall bay-like paleogeographic setting. Previous studies have suggested that halokinesis-induced local tectonics and orbital climatic fluctuations have been the primary controls on depositional evolution. In the present study, we investigated a 60-m-thick Karaman Gypsum Member (KGM), located at the base of the Karacaoren Formation, in terms of its sedimentological, paleontological; both palynology and nannofossil biostratigraphy, and geochemical/mineralogical aspects to better characterize climatic controls on its deposition. Nannofossil assemblages indicate that the studied member is confined within the Sphenolithus belemnos Zone (NN3; 18.92-17.97 Ma), and is mainly composed of rhythmic alternations of supratidal evaporites and lagoonal/marine mudstones. The palynological data demonstrate a minor, yet consistent, occurrence of megathermic taxa and numerous dinoflagellate cysts in mudstone intervals. The high chemical proxy of alteration (CPA) values and occurrence of kaolinites in the same mudstone intervals further prove deposition under warm and humid subtropical conditions. The perfect match between the environmental cyclicities in the KGM with a benthic delta O-18 curve justifies a strong control of obliquity/short eccentricity of a 40-100 kyr duration, and hints at radical precipitation changes throughout the individual orbital cycles. These precipitation changes are explained by extreme latitudinal precipitation gradients during relatively hot periods before the mid-Miocene Climatic Optimum.

Subject Keywords

Evaporite cycles, Nannofossils, Paleoclimate, Palynology, Orbital forcing

URI

https://hdl.handle.net/11511/48282

Journal

PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY

DOI

https://doi.org/10.1016/j.palaeo.2017.11.035

Collections

Department of Geological Engineering, Article

Suggestions

OpenMETU
Core

Clay controls on reservoir properties in sandstone of Kuzgun formation and its relevance to hydrocarbon exploration, Adana basin, Southern Turkey Buyukutku, AG; Bagci, AS (Elsevier BV, 2005-06-30) The shallow marine lithofacies of Kuzgun formation represented by porous reservoir facies are predominantly represented by the sandstones of Middle-Upper Miocene age. On the basis of texture and mineralogy, the sandstone formation may be classified into three lithological units as a lithofacies-1, -2, -3. The impervious lithofacies-1 (non-reservoir) sandstone formation is represented by alternating layers of mudstone/sandstone exhibiting bioturbation characteristics. The lithofacies-2 and lithofacies-3 unit...
High-resolution sequence stratigraphic correlation in the Upper Jurassic (Kimmeridgian)-Upper Cretaceous (Cenomanian) peritidal carbonate deposits (Western Taurides, Turkey) Altıner, Demir; Yılmaz, İsmail Ömer; Bayazitoglu, M; Gaziulusoy, ZE (1999-01-01) Upper Jurassic (Kimmeridgian)- Upper Cretaceous (Cenomanian) inner platform carbonates in the Western Taurides are composed of metre-scale upward-shallowing cyclic deposits (parasequences) and important karstic surfaces capping some of the cycles. Peritidal cycles (shallow subtidal facies capped by tidal-Aat laminites or fenestrate limestones) are regressive- and transgressive-prone (upward-deepening followed by upward-shallowing facies trends). Subtidal cycles are of two types and indicate incomplete shall...
Occurrence of the Lower Cambrian anemone-style trace fossils in the Zabuk Formation (Mardin-Derik, SE Turkey) Hosgor, Izzet; Yılmaz, İsmail Ömer (2018-10-01) The Zabuk Formation of the Derik Group exposed over much of south-eastern Turkey presents a succession composed of shallow marine and fluvial siliciclastic sedimentary rocks. The Lower Cambrian assemblages containing abundant anemone-style trace fossils are known from most major palaeocontinents such as Laurentia, Baltica, and Gondwana. These have possible affinities with semi-infaunal dwelling anemones on siliciclastic midlatitude shelves of West Gondwana in early Fortunian deposits. Among them is Bergauer...
Sedimentology, cyclostratigraphy, sequence stratigraphy and geochemistry of the middle eocene lacustrine-marine oil-shales transition, Mudurnu Göynük basin, NW Anatolia, Turkey Afridi, Bakht Zamir; Yılmaz, İsmail Ömer; Department of Geological Engineering (2019) Continuous studied successions of the Middle Eocene, Mudurnu-Göynük basin, in the NW Anatolia indicate a transition from marine-influence lacustrine to marine environment due to the relative rise in sea-level, which was separated by barrier deposits. Different lithofacies are identified in the studied sections, including limestone, marl, oil-shale, calcareous sandstone, conglomeratic and bio-calcirudite. Number of fossil assemblages are recorded including ostracods, charophyte gyrogonites, gastropods, bival...
GEOCHEMICAL CHARACTERISTICS OF GRANITOIDS ALONG THE WESTERN MARGIN OF THE CENTRAL ANATOLIAN CRYSTALLINE COMPLEX AND THEIR TECTONIC IMPLICATIONS AKIMAN, O; ERLER, A; GONCUOGLU, MC; Güleç, Nilgün Türkan; GEVEN, A; TURELI, TK; KADIOGLU, YK (1993-12-01) The closely related assemblage of igneous and metamorphic rocks that lie within a triangular area approximately bounded by the Tuzgolu Fault, the Ecemis Fault and the Izmir-Ankara-Erzincan Suture and between the lines connecting Ankara, Sivas and Nigde is called the Central Anatolian Crystalline Complex (CACC). The granitoids cropping out within the CACC can be divided areally into three groups: (1) a large number of individual small plutons which form an arcuate set and curve from NE-SW to NW-SE and extend...

Citation Formats

F. OCAKOĞLU, N. Yavuz, A. Aydln, and İ. Ö. Yılmaz, “Orbitally-driven Mid-Burdigalian Coastal Sabkha cycles from the Sivas Basin: Sedimentological, paleontological, and geochemical data,” PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY, pp. 505–521, 2018, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/48282.