Origin of the Early-Middle Devonian magmatism in the Sakarya Zone, NW Turkey: Geochronology, geochemistry and isotope systematics

AYSAL, Namık
Ustaomer, Timur
Ongen, Sinan
Keskin, Mehmet
Köksal, Serhat
Peytcheva, Irena
Fanning, Mark
A unique example of isotopically-dated Devonian metagranitoid (the camlik metagranite; Okay et al., 1996) crops out in the Biga Peninsula, NW Turkey, although its contact relationships with the country rocks and geodynamic setting have remained to be enigmatic so far. Our field work, however, has shown that a number of metagranitoid bodies similar to the camlik metagranite intruded the country rocks and developed contact metamorphic zones, consisting of andalusite and calcsilicate hornfelses, garnet-epidote and diopsite-wollastonite skarns. The country rocks of these metagranitoids are made up of regionally metamorphosed metaclastic successions with subordinate metacarbonate-metachert-metabasites (the Kalabak formation), intercalated with tectonic slices of meta-serpentinites. The metagranitoids and the Kalabak formation are collectively termed here the Havran Unit which forms a NE-SW trending, 20 km wide and 80 km long belt in the Biga Peninsula. The Havran Unit is unconformably overlain by the Late Triassic shallow marine sediments and is in tectonic contact with the Permo-Triassic Karakaya Complex, interpreted as the Palaeotethyan subduction-accretion complex.


Geochemistry of the post-collisional Miocene mafic Tunceli Volcanics, Eastern Turkey: Implications for the nature of the mantle source and melting systematics
Aktağ, Alican; Sayıt, Kaan (2019-01-01)
The East Anatolian Accretionary Complex (EAAC) comprises an ideal example of post-collisional volcanism within the Africa-Eurasia collision zone. The Miocene mafic Tuncell Volcanics, as a part of this post-collisional volcanic system, are located in the western termination of EAAC. The mafic Tunceli Volcanics are characterized by mildly alkaline and tholeiitic basalts, in which olivine, clinopyroxene and plagioclase characterize the main mineralogy. The role of fractional crystallization (FC) and assimilati...
Evolution of the Neotethyan branches in the Eastern Mediterranean Petrology and ages of oceanic basalts
Göncüoğlu, Mehmet Cemal; Sayıt, Kaan; Uzunçimen Keçeli, Seda (null; 2015-10-27)
The Anatolian Peninsula in the Eastern Mediterranean includes remnants of the Proto-, Paleo-, Neo- and Para-Tethys oceans. From these, the Neotethys with its various branches has been studied relatively well. Disregarding the embayments of the major oceanic strands, three main oceanic branches are distinguished by the presence of ophiolitic suture belts, separating terranes of continental crust origin (Fig. 1). From S to N these are the Southern branch of Neotethys, the ...
Origin and significance of a quartz tourmaline breccia zone within the central anatolian crystalline complex, Turkey
Demirel, Serhat; Göncüoğlu, Mehmet Cemal; Department of Geological Engineering (2004)
The aim of this study is to investigate the petrography, geochemistry and evolution of quartz-tourmaline-rich rocks occurring in a wide breccia zone within the Late Cretaceous Kerkenez Granitoid (Central Anatolian Crystalline Complex (CACC), Turkey). The approximately 40-m wide main breccia zone has a NE-SW trend and is characterized by intense cataclastic deformation. The breccia zone can be traced several kilometers towards the west and generally occurs as tourmaline-filled faults and 1mm-30cm-thick veins...
ERGIN, M; OKYAR, M; TIMUR, K (Elsevier BV, 1992-02-29)
High-resolution shallow-seismic reflection (Uniboom) profiles obtained in inner and mid-shelf areas of eastern Mersin Bay (Turkey, northeastern Mediterranean) show that the sedimentary column comprises two major and distinct lithological sequences (C and B) separated by a reflector (R) which is interpreted as the pre-Holocene surface. The upper sedimentary sequence (C) is thought to represent roughly the Holocene and is characterized by parallel/divergent to sigmoidal reflection patterns above (Unit 1) and ...
Discovery of the oldest (upper Ladinian to middle Carnian) radiolarian assemblages from the Bornova Flysch Zone in western Turkey: Implications for the evolution of the Neotethyan Izmir-Ankara ocean
TEKİN, UĞUR KAĞAN; Göncüoğlu, Mehmet Cemal (2007-12-01)
Diverse upper Ladinian to middle Carnian radiolarian faunas have been obtained from different ribbon cherts blocks and tectonic slices of the Izmir-Ankara Suture Complex and the marginal sediments of the Tauride-Anatolide platform within the Bornova Flysch Zone, western Turkey.
Citation Formats
N. AYSAL et al., “Origin of the Early-Middle Devonian magmatism in the Sakarya Zone, NW Turkey: Geochronology, geochemistry and isotope systematics,” JOURNAL OF ASIAN EARTH SCIENCES, pp. 201–222, 2012, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/46069.