Sedimentary provenance from the evolving forearc-to-foreland Central Sakarya Basin, western Anatolia reveals multi-phase intercontinental collision

Abstract

 Multi-phase intercontinental collision is identified in western Anatolia by sedimentary basin changes  Sedimentary provenance change indicate collision was at 76 Ma, but significant thickskinned deformation was delayed until 54 Ma  The 20 Myr duration of initial collision can be explained by three multi-stage mechanisms involving changes in plate coupling manuscript submitted to Geochemistry, Geophysics, Geosystems

The Geodynamic Implications of Passive Margin Subduction in Northwest Turkey

“…(2018) and compared to detrital zircon maximum depositional ages from samples published by Mueller et al. (2019, 2022). To remain as objective as possible, we used a stochastic approach to calculating zircon maximum depositional ages based on a software provided by Keller et al.…”

“…Closure of the ∼1,000 km wide İzmir‐Ankara Ocean in Western Anatolia (van Hinsbergen et al., 2016) was followed by collision between 80 and 60 Ma (e.g., Ballato et al., 2011; Cavazza et al., 2012; Gülyüz, 2020; Gülyüz et al., 2019; Mueller et al., 2022; Okay et al., 2020). At this juncture in the region's geodynamic evolution, both the single and double subduction zone models are more or less identical.…”

“…Following this drop, a shallow marine environment developed in Maastrichtian times and is recorded by a shoaling event (Ocakoğlu et al., 2018). Shoaling to a shallow marine environment was coeval with the onset of basement exhumation and continued uplift of the accretionary prism (Mueller et al., 2022).…”

“…We refer the reader to Mueller et al. (2019, 2022) for U‐Pb methods and data. All zircon U‐Pb samples were analyzed for Hf isotopes at The University of Arizona LaserChron Center.…”

“…Measurement precision for individual analyses are expressed using 2 s average uncertainty (±∼3 εHf units). We collected Hf data for isotopic fingerprinting from 21 late Cretaceous–Eocene sedimentary and extrusive volcaniclastic rock zircon samples (Mueller et al., 2022; Ocakoğlu et al., 2018). Hafnium (Hf) isotopes were analyzed from 508 individual zircon with ages between 120 and 40 Ma.…”