Tectono-stratigraphic and thermal evolution of the haymana basin, Central Anatolia, Turkey

Download
2015
Gülyüz, Erhan
The Haymana Basin is located on the southernmost tip of the Central Pontides and straddles between the İzmir-Ankara-Erzincan Suture Zone at the north and Intra-Tauride Suture Zone at the south. These suture zones designate the former positions of various branches of the Neotethys Ocean in Turkey, the basins evolved within these zones record the progressive closure of the Neotethys and the collision between Taurides, Kırşehir Block and Pontides during late Cretaceous to Eocene time interval. The Haymana Basin is one of the best area because of its crucial position and continuous Late Cretaceous to Middle Eocene marine deposits to unravel the evolution of the Neotethys. In addition to Neogene cover units, four upper Cretaceous to Paleogene key sequences are defined based on depositional environments. These sequences grade laterally and vertically into each other and are continuous from the Late Cretaceous to Eocene whereas local progressive syn-sedimentary unconformities and frequent depocenter migrations are common. Additionally, post–middle Paleocene to middle Eocene sequences coarse upwards. These characteristics possibly reflect a response to local uplift and subsidence in front of south-verging thrust faults in a tectonic setting of transition from fore-arc to collisional settings, subsequent to the terminal subduction of the Neotethys at the end of early Paleocene. vi The Haymana Basin is represented by two structural segments based on the trends of E–W and WNW–ESE directed structures at the south-eastern and north-western segments, respectively. The balanced cross-sections indicate ~4% and ~25 shortening at the north-western and south-eastern segments, respectively. The differences in amount of shortenings might be result of reduce in the effectiveness zone of Dereköy basin bounding thrust fault towards west and large vertical block rotations controlled by a strike-slip fault which might be the westward extension of Hirfanlar-Hacıbektaş fault zone into the Haymana basin that dissects the Kırşehir Block into two sectors. Fault kinematic analysis, based on 623 fault-slip data from 73 stations, indicates that the basin was subjected to initially N–S extension and then a N–S directed compression and coeval E–W extension during late Cretaceous–early Miocene time interval. Thermo-chronometric samples collected from the basinfill were analyzed in order to unravel the thermal and exhumation history of the basin by using Apatite-Helium (AHe) dating and fission track length measurement techniques. AHe dating results indicate that the south-eastern segment of the basin started to uplift at least before 35.29 ± 3.5 Ma whereas north-western segment, 21.83 ± 2.2 Ma. Thermal models also show ~14 Ma differences in initiation of uplift in these two structural segments. They also indicate gradual subsidence until late Eocene (9.2m/kyr) and following rapid uplift (14.1m/kyr) until early Miocene for the south-eastern segment. It is proposed that the Haymana Basin was a fore-arc basin developed at the southern margin of the Pontides along the northward subducted Neotethys Ocean, then after Paleocene, the basin evolved into foreland settings in front of a south-vergent fold and thrust belt developed during continental collision. Additionally the north-westward movement of Kırşehir Block caused the basin to rotate along vertical axes and promoted its exhumation.

Suggestions

GEOLOGICAL HISTORY OF THE NORTHWARD ARCHED SEGMENT OF THE NORTH ANATOLIAN TRANSFORM-FAULT ZONE
DIRIK, K (Wiley; 1993-12-01)
The study area is located in the southern part of the Central Pontides. The rocks exposed in this region have been divided into three major groups: basement, cover sequence and volcanic rocks. The basement rocks are composed of metamorphic units and a chaotic assemblage derived from an accretionary prism produced during the northward subduction of northern Neo-Tethys during the Late Cretaceous. During the same period, the basal element of the cover sequence, a thick and coarsening upward flysch succession (...
Rapid cooling history of a Neotethyan ophiolite: Evidence for contemporaneous subduction initiation and metamorphic sole formation
PARLAK, OSMAN; Dunkl, Istvan; KARAOĞLAN, FATİH; Kusky, Timothy M.; Zhang, Chao; Wang, Lu; Koepke, Juergen; Billor, Zeki; Hames, Willis E.; ŞİMŞEK, EMRAH; Simsek, Gokce; ŞİMŞEK, TUĞÇE; Ozturk, Selena Ezgi (Geological Society of America, 2019-11-01)
The Beywhir-Hoyran Nappes, including Mesozoic carbonate platform rocks, deepsea sediments, and ophiolite-related units, crop out extensively on the western limb of the Isparta Angle in the Central Taurides, Turkey. The ophiolite-related rocks are represented by variably serpentinized harzburgitic mantle tectonites, tectonically underlain by a subophiolitic metamorphic sole and melange. The harzburgitic mantle tectonites and metamorphic sole are intruded by undeformed isolated dikes. Protoliths of the metamo...
Tectonomagmatic evolution of bimodal plutons in the central Anatolian crystalline complex, Turkey
Kadioglu, Yk; Dilek, Y; Güleç, Nilgün Türkan; Foland, Ka (University of Chicago Press, 2003-11-01)
The NW-trending Agacoren Intrusive Suite (AIS) on the east side of the Salt Lake (Tuz Golu), Turkey, is part of a curvilinear volcanoplutonic complex along the western edge of the central Anatolian crystalline complex (CACC). Granitoids constitute the predominant lithological group within the AIS and range in composition from monzonite through granite to alkali feldspar granite. Gabbroic rocks occur as irregular intrusive bodies with sinusoidal, irregular contacts with the granitoid plutons and vary from di...
Mafic microgranular enclaves and interaction between felsic and mafic magmas in the agacoren intrusive suite: Evidence from petrographic features and mineral chemistry
Kadioglu, Yusuf Kagan; Güleç, Nilgün Türkan (Informa UK Limited, 1996-01-01)
The Agacoren Intrusive Suite is exposed as a large intrusive body over ∼500 km2 east of Lake Tuz in central Anatolia and consists of the Cokumkaya gabbro, the Agacoren granitoid, and young dikes. The Agacoren granitoid is the predominant lithology of the Agacoren Intrusive Suite, and is differentiated into several subunits ranging in composition from monzonite, through granite, to alkali feldspar granite. The Cokumkaya gabbro occurs as stocks enclosed in the Agacoren granitoid; individual bodies range in si...
Erosional truncation of uppermost Permian shallow-marine carbonates and implications for Permian-Triassic boundary events
Payne, Jonathan L.; Lehrmann, Daniel J.; Follett, David; Seibel, Margaret; Kump, Lee R.; Riccardi, Anthony; Altıner, Demir; Sano, Hiroyoshi; Wei, Jiayong (Geological Society of America, 2007-07-01)
On shallow-marine carbonate buildups in south China, Turkey, and Japan, uppermost Permian skeletal limestones are truncated by an erosional surface that exhibits as much as 10 cm of topography, including overhanging relief. Sedimentary facies, microfabrics, carbon isotopes, and cements together suggest that erosion occurred in a submarine setting. Moreover, biostratigraphic data from south China demonstrate that the surface postdates the uppermost Permian sequence boundary at the global stratotype section a...
Citation Formats
E. Gülyüz, “Tectono-stratigraphic and thermal evolution of the haymana basin, Central Anatolia, Turkey,” Ph.D. - Doctoral Program, Middle East Technical University, 2015.