Whole-Rock and Nd-Pb isotope geochemistry and radiolarian ages of the volcanics from the Yüksekova Complex (Maden Area, Elazığ, E Turkey): Implications for a Late Cretaceous (Santonian-Campanian) Back-Arc basin in the southern Neotethys

Ural, Melek
Sayıt, Kaan
The Southeast Anatolian Orogenic Belt (SAOB) is characterized by a tectonic assemblage consisting of dismembered ophiolites, subduction-related as-semblages, and continental fragments. Whether the subduction-related volcanic assemblages formed in a Southern Neotethys oceanic arc-basin system (the Yüksekova Complex) or in a back-arc basin (the Maden Complex) originated after the closure of Southern Neotethys is still debated. To shed light on this matter, we focus on the Maden area, known as the type locality for the Maden Complex. The dating of radiolarian cherts associated with the volcanics from the Maden area yields Late Cretaceous (Santonian-Campanian) ages, indicating that these extrusives belong to the Yüksekova Complex. The Yüksekova volcanics are all subalkaline and mainly characterized by basalts, with subordinate andesitic varieties. The Zr-Nb-Y systematics of the Yüksekova lavas suggest that they have tapped a heterogeneous mantle source region with variable contribution from the depleted mantle. The positive εNd values of the volcanics also support the involvement of the depleted mantle. A common feature of the Yüksekova lavas is the marked depletion in Nb relative to Th and La, indicating a subduction-modified mantle source for their petrogenesis. The Pb isotope systematics, particularly the high207Pb/206Pb, further implies a variable slab-derived sediment input in the source of these volcanics. Overall, trace element and isotopic characteristics of the Yüksekova lavas are consistent with their generation in an oceanic back-arc basin during the Santonian-Campanian interval in the Southern Neotethys. The Yüksekova back-arc basin characterizes the westward continuum of an extensive Late Cretaceous intra-oceanic subduction system, whose remnants can be traced further to the east, toward Iran.


Palaeoenvironmental and chronological constraints on the Tuglu Formation (Cankiri Basin, Central Anatolia, Turkey)
Mazzini, Ilaria; Hudackova, Natalia; Joniak, Peter; Kovacova, Marianna; Mikes, Tamas; Mulch, Andreas; Rojay, Fuat Bora; Lucifora, Stella; Esu, Daniela; Soulie-Maersche, Ingeborg (2013-01-01)
The Cankiri Basin, located in the northern part of the Central Anatolian Plateau, is a large Tertiary basin where thick Miocene to Quaternary continental sediments overlay the Cretaceous-Tertiary units. This investigation focuses on the Tuglu Formation, an Upper Miocene succession mainly composed of dark grey silty and organic rich clays. The type section of Tuglu has been sampled for an array of multidisciplinary analyses. The palaeontological proxies included ostracod, foraminifer, nannoplankton, pollen, ...
Segmented African lithosphere beneath the Anatolian region inferred from teleseismic P-wave tomography
Biryol, C. Berk; Beck, Susan L.; Zandt, George; Özacar, Atilla Arda (2011-03-01)
P>Lithospheric deformation throughout Anatolia, a part of the Alpine-Himalayan orogenic belt, is controlled mainly by collision-related tectonic escape of the Anatolian Plate and subduction roll-back along the Aegean Subduction Zone. We study the deeper lithosphere and mantle structure of Anatolia using teleseismic, finite-frequency, P-wave traveltime tomography. We use data from several temporary and permanent seismic networks deployed in the region. Approximately 34 000 P-wave relative traveltime residual...
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; OKUYUCU, CENGİZ; Dogan, Adil; TEKİN, UĞUR KAĞAN; Ivanova, Daria; Boncheva, Iliana; Lakova, Iskra; Sachanski, Valeri; Kuscu, Ismail; Tuncay, Ercan; Demiray, D. Gulnur; Soycan, Havva; Göncüoğlu, Mehmet Cemal (2013-8-01)
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...
Preliminary Geochemical Data for the Diabase Dykes from theIzmir-Ankara-Erzincan Suture Belt, Central Anatolia
Balcı, Uğur; Sayıt, Kaan (2017-04-23)
The Izmir-Ankara-Erzincan Suture Belt preserves oceanic and continental fragments originated from the closure of the northern branch of Neotethys. In the Bogazkale area (Central Anatolia), the pieces of the Neotethyan oceanic lithosphere exist in a chaotic manner, forming an ophiolitic mélange. Within the mélange, diabase dykes occur, which are found to cut various types of oceanic lithospheric rocks, including pillow basalts, gabbros and serpentinized ultramafics. We here present the preliminary geochemica...
Lake Hazar basin: A negative flower structure on the east anatolian fault system (EAFS), SE Turkey
Aksoy, Ercan; Inceoez, Murat; Kocyigit, Ali (2007-01-01)
The East Anatolian Fault System ( EAFS) is a 30-km-wide, 700-km-long and NE-trending sinistral strike-slip megashear belt between the Anatolian platelet in the northwest and African-Arabian plates in the southeast. It is located between Karliova County in the NE and Karatas ( Adana)-Samandag ( Antakya) in the SW. In the Lake Hazar region, the EAFS consists of five fault zones. These are, from north to south, the Elazig fault zone, the Uluova fault zone, the Sivrice fault zone, the Adiyaman fault zone and th...
Citation Formats
M. Ural, K. Sayıt, and U. K. TEKİN, “Whole-Rock and Nd-Pb isotope geochemistry and radiolarian ages of the volcanics from the Yüksekova Complex (Maden Area, Elazığ, E Turkey): Implications for a Late Cretaceous (Santonian-Campanian) Back-Arc basin in the southern Neotethys,” Ofioliti, vol. 47, no. 1, pp. 65–83, 2022, Accessed: 00, 2022. [Online]. Available: https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85124475441&origin=inward.