New age data from the tectonostratigraphic units of the Istranca "Massif" in NW Turkey: a correlation with SE Bulgaria

Bedi, Yavuz
Vasilev, Emil
Dabovski, Christo
Ergen, Ali
Dogan, Adil
Ivanova, Daria
Boncheva, Iliana
Lakova, Iskra
Sachanski, Valeri
Kuscu, Ismail
Tuncay, Ercan
Demiray, D. Gulnur
Soycan, Havva
Göncüoğlu, Mehmet Cemal
The Istranca Crystalline Complex in NW Anatolia and SE Bulgaria includes structural units that differ in lithostratigraphy, metamorphism, age and structural position. They are collectively named as the "Istranca nappes" comprising from bottom to top the Sarpdere, Mahyadag. and Dogankoy Nappes. The Sarpdere Nappe consists of Lower Triassic arkosic metasandstones with slate interlayers, followed by Middle to Upper Triassic carbonates and an alternation of Upper Triassic clastics and carbonates. The Mahyada. g Nappe comprises a low-grade metamorphic Late Paleozoic-Triassic carbonate-siliciclastic sedimentary succession. The Dogankoy Nappe includes Precambrian?-Paleozoic metasediments, intruded by Late Carboniferous-Early Permian calc-alkaline granitoids. Its Triassic cover comprises metaclastics and metacarbonates. The Istranca nappes were juxtaposed at the end of the Triassic and transgressively covered by Lower Jurassic coarse clastics, followed above by Middle to Late Jurassic carbonates, black shales and carbonate-siliciclastic sedimentary succession. The phosphate concretions in black shales yielded radiolarian assemblages indicating Late Bajocian-Early Bathonian, Early Bathonian and Early Kimmeridgian ages. These nappes and their Jurassic cover are unconformably overlain by the Cenomanian-Santonian volcano-sedimentary successions intruded by Santonian-Campanian Derekoy-Demirkoy intrusive suite. The preliminary data suggest that the Variscan basements of the Mahyadag and Sarpdere Nappes were juxtaposed prior to the Triassic and overridden by the Dogankoy Nappe of possible Rhodopean origin from S to N during the Cimmerian compressional events.


New conodont and palynological data from the Lower Palaeozoic in Northern Camdag, NW Anatolia, Turkey
Boncheva, Iliana; Göncüoğlu, Mehmet Cemal; Leslie, Stephen A.; Lakova, Iskra; Sachanski, Valeri; Saydam, Guelnur; Gedik, Ibrahim; Koenigshof, Peter (2009-01-01)
Two main thrust slices in the Camdag area ( NW Anatolia), were informally named the Southern and Northern Camdag units. New micropaleontological and palynological data about the Ordovician, Silurian and Devonian in the Northern Camdag have allowed a better understanding of the early Palaeozoic evolution of this critical area between the Istanbul Terrane in the west and the Zonguldak Terrane in the east. The Middle Ordovician age obtained from the conodont-bearing limestone band within the Aydos formation in...
New zircon U-Pb LA-ICP-MS ages and Hf isotope data from the Central Pontides (Turkey): Geological and geodynamic constraints
ÇİMEN, OKAY; Göncüoğlu, Mehmet Cemal; Simonetti, Antonio; Sayıt, Kaan (2018-05-01)
The Central Pontides in northern Anatolia is located on the accretionary complex formed by the closure of Neotethyan Intra-Pontide Ocean between the southern Eurasian margin (Istanbul-Zonguldak Terrane) and the Cimmerian Sakarya Composite Terrane. Among other components of the oceanic lithosphere, it comprises not yet well-dated felsic igneous rocks formed in arc-basin as well as continent margin settings. In-situ U-Pb age results for zircons from the arc-basin system (tiangaldag Metamorphic Complex) and th...
The Character and displacement of Adıyaman fault (southeast anatolia): evidence from subsurface data
Durukan, Bayram Alper; Bozkurt, Erdin; Department of Geological Engineering (2019)
Structural interpretation of five 2D seismic sections acquired by TPAO is carried out in the Adıyaman region of Southeast Anatolia. The sections are geological calibrated with stratigraphic logs of five boreholes. This study has resulted in the discovery of a previously undefined fault, herein named as Şambayat Fault. The fault is a NW-SEtrending structure that parallels the Bozova Fault and comprises several parallel fault segments. The structural maps of Cretaceous Sayındere and Karababa formations are al...
The effects of subduction termination on the continental lithosphere: Linking volcanism, deformation, surface uplift, and slab tearing in central Anatolia
Delph, Jonathan R.; Abgarmi, Bizhan; Ward, Kevin M.; Beck, Susan L.; Özacar, Atilla Arda; Zandt, George; Sandvol, Eric; TÜRKELLİ, NİYAZİ; Kalafat, Dogan (Geological Society of America, 2017-11-01)
Subduction beneath central Anatolia represents the transition between continuous subduction along the Aegean trench in the west and slab break-off and/or subduction termination at the Arabian-Eurasian collision zone in the east. Using recently collected seismic data from the Continental Dynamics-Central Anatolian Tectonics project alongside a newly developed approach to the creation of a 3D shear-velocity model from the joint inversion of receiver functions and surface-wave dispersion data, we can gain impo...
Coeval extensional shearing and lateral underflow during Late Cretaceous core complex development in the Nigde Massif, Central Anatolia, Turkey
Gautier, Pierre; Bozkurt, Erdin; Bosse, Valerie; Hallot, Erwan; Dirik, Kadir (2008-01-12)
[1] The Nigde Massif, at the southern tip of the Central Anatolian Crystalline Complex, consists of two structural units. Foliations in the lower unit define a dome cored by migmatites. The contact between the two units bears all the elements of a ductile to brittle extensional detachment. Hence the Nig. de Massif represents an extensional metamorphic core complex. Top-to-NE/ENE shearing at higher levels of the lower unit relates to displacement along the detachment. Deeper levels of the lower unit display ...
Citation Formats
Y. Bedi et al., “New age data from the tectonostratigraphic units of the Istranca “Massif” in NW Turkey: a correlation with SE Bulgaria,” GEOLOGICA CARPATHICA, pp. 255–277, 2013, Accessed: 00, 2020. [Online]. Available: