In the Boyalı area (northern Anatolia), a thick succession of the Early Maastrichtian - Middle Paleocene Taraklı Flysch crops out. The Taraklı Flysch represents a foredeep sediment deposited during the final stage of collision between the Sakarya and Istanbul-Zonguldak continental margins, that developed as a consequence of the closure of the Intrapontide oceanic basin. The top of the Taraklı Flysch is characterized by a level of slide-block in shaly-matrix lithofacies that can be considered as the result of several fast catastrophic events predating the closure of the basin and its deformation. This level consists of slide-blocks surrounded by monomict pebbly-mudstones and pebbly-sandstones. Among the slide-blocks, the biggest one consists of quartz-monzonites and leucocratic granodiorites of Late Permian age (260.8 ± 2.2 Ma) dated by zircon LA-ICP-MS method. By comparison with the regional data, the source area of these granitoids can be identified in the Istanbul-Zonguldak terrane. This evidence suggests a new picture for the paleogeographic setting of the ultimate stage of the continental collision between the Istanbul-Zonguldak and the Sakarya continental margins. In this scenario the coarse-grained deposits of the Taraklı Flysch are supplied by an orogenic wedge, consisting of oceanic units topped by the Istanbul-Zonguldak terrane. This orogenic wedge represented the north side of the foredeep, while the southern one was represented by the still undeformed Sakarya continental margin.
U-Pb zircon geochronology of intrusive rocks from an exotic block in the Late Cretaceous – Paleocene Taraklı Flysch (northern Turkey): Constraints on the tectonics of the Intrapontide suture zone / M. Di Rosa, F. Farina, M. Marroni, L. Pandolfi, M.C. Göncüoğlu, A. Ellero, G. Ottria. - In: JOURNAL OF ASIAN EARTH SCIENCES. - ISSN 1367-9120. - 171(2019 Mar), pp. 277-288.
|Titolo:||U-Pb zircon geochronology of intrusive rocks from an exotic block in the Late Cretaceous – Paleocene Taraklı Flysch (northern Turkey): Constraints on the tectonics of the Intrapontide suture zone|
FARINA, FEDERICO (Secondo)
|Parole Chiave:||Foredeep; Intrapontide suture; Permian granitoids; Slide-block; Taraklı Flysch; Turkey; Geology; Earth-Surface Processes|
|Settore Scientifico Disciplinare:||Settore GEO/07 - Petrologia e Petrografia|
|Data di pubblicazione:||mar-2019|
|Data ahead of print / Data di stampa:||2018|
|Digital Object Identifier (DOI):||http://dx.doi.org/10.1016/j.jseaes.2018.11.017|
|Appare nelle tipologie:||01 - Articolo su periodico|