Post-Triassic evolution of Central Pontides: evidence from Amasya region, northern Anatolia

1995-12-01
The Central Pontides is an orogenic belt evolved since Triassic by the progressive closure of Paleo- and Neo-Tethys oceans, which is bounded by the IzmirAnkara-Erzincan Suture (Northern Neotethyan Suture) from the south. The post-Triassic Neo-Tethyan evolution in Amasya region started with Liassic transgression on the rifted pre-Liassic basement rocks. Later, the initial rifting failed and the platform was uplifted. The uplifted platform turned into an open-marine depositional realm as recorded by the deposition of Callovian Ammonitoco Rosso facies. The open-marine to deep sea depositional period was followed by a regressive platform carbonate deposition during Callovian-Valanginian. After a short period of nondeposition, the ongoing 'rifting' continued with the deposition of Aptian-Cenomanian deep-sea pelagics and turbidites. The passive margin was already destructed and turned into an active continental margin as a result of northward subduction of northern branch of the Neo-Tethyan oceanic crust during post-Cenomanian - pre-Campanian interval. Thermal doming beneath the future magmatic arc to the north and tectonic transportion of mobile accretionary prism towards south, resulted in the development of constructive forearc basins during mid Campanian-Maastrichtian. Ongoing emergence in the Amasya region and the cumulative amalgamation of the accretionary prism were followed by a newly arising extensional regime during Lutetian. The retrochariage of accreted melange onto Lutetian peripheral passive rift basin units from south to north, was followed by the dacitic intrusions which were probably the result of thickening of continental crust in the region. The entire region emerged under the control of a N-S directed compressional contractional regime until the initiation of compressional-extensional tectonic regime (North Anatolian Fault System).
Geologica Romana

Suggestions

Structural evolution of the Gediz Graben, SW Turkey: temporal and spatial variation of the graben basin
Ciftci, N. B.; Bozkurt, Erdin (Wiley, 2010-12-01)
The structural evolution of the Miocene to Recent Gediz Graben is intimately related to the evolution of its southern margin. This margin is shaped by a time-transgressive, composite structure that possesses flat-ramp geometry with three separate dip domains: a low-angle shallow segment; a steeper middle segment; and a low-angle deeper segment. This geometry was probably produced by one of two mechanisms, which operated perpendicular to the general trend of the graben, resulting in gradual back-rotation fol...
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...
Early Cambrian back-arc volcanism in the western Taurides, Turkey: implications for rifting along the northern Gondwanan margin
Gursu, S; Göncüoğlu, Mehmet Cemal (2005-09-01)
The Lower Cambrian (Tommotian) Gogebakan Formation in western Central Anatolia is made up of slightly metamorphosed continental to shallow marine elastic rocks with pillowed and massive spilitic lavas and dolerite dykes. Spilitic lavas, commonly amygdaloidal, are albite-and pyroxene-phyric with the metamorphic mineral paragenesis albite + calcite + sericite +/- epidote +/- tremolite +/- chlorite. Dolerite dykes mainly include plagioclase and pyroxene as primary minerals and tremolite epidote chlorite as low...
LATE CRETACEOUS ARC AND BACK-ARC FORMATION WITHIN THE SOUTHERN NEOTETHYS: WHOLE-ROCK, TRACE ELEMENT AND Sr-Nd-Pb ISOTOPIC DATA FROM BASALTIC ROCKS OF THE YUKSEKOVA COMPLEX (MALATYA- ELAZIG, SE TURKEY)
Ural, Melek; ARSLAN, MEHMET; Göncüoğlu, Mehmet Cemal; TEKİN, UĞUR KAĞAN; KÜRÜM, SEVCAN (2015-06-01)
The remnants of the Southern Neotethys are represented by ophiolitic bodies and subduction/accretion complexes along the Southeast Anatolian-Zagros suture belt in the Eastern Mediterranean. Around Malatya and Elazig areas (SE Turkey), they are found within imbricated slices of a melange complex, known as the Yuksekova Complex. The studied basaltic rocks are common members of this melange complex, and show distinctive features of sources with tholeiitic to tholeiitic-transitional character. Petrography, whol...
Late Cretaceous Arc Magmatism in the Southern Central Pontides: Constraints for the closure of the Northern Neotethyan branches
Sayıt, Kaan; Cemal Göncüoğlu, M.; Ellero, Alessandro; Ottria, Giuseppe; Frassi, Chiara; Marroni, Michele; Pandolfi, Luca (2022-01-31)
In the southern Central Pontides in northern Turkey the remnants of two Neotethyan oceanic basins, currently represented by the Intra-Pontide and the Izmir-Ankara-Erzincan sutures, and the interposing continental microplate (i.e., the Sakarya Composite Terrane) are completely dissected by the North Anatolian Shear Zone (NASZ). Within the resulting kilometre-scale, strike-slip fault-bounded blocks, several Late Cretaceous arc-type magmatic units have been detected. In this paper, we present new geochemical d...
Citation Formats
F. B. Rojay, “Post-Triassic evolution of Central Pontides: evidence from Amasya region, northern Anatolia,” Geologica Romana, vol. 31, pp. 329–350, 1995, Accessed: 00, 2022. [Online]. Available: https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=0029432210&origin=inward.