Geological evolution of the late Mesozoic continental margin of Northwestern Anatolia

Y. Yilmaz*, Ş C. Genç, E. Yiǧitbaş, M. Bozcu, K. Yilmaz

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

129 Citations (Scopus)

Abstract

The Armutlu peninsula is a composite tectonic entity made up of sections of the Sakarya continent, the Rhodope-Pontide fragment and an ophiolite. These were assembled following a continental collision between Gondwanaland and Laurasia during the Late Cretaceous. The northern margin of the Sakarya continent underwent progressively increasing deformation prior to and during the advancing collision, due to continued convergence between the two continents. Initially, the leading edge of the continent subsided under the load of an approaching ophiolitic slab. Following this, a north-directed thrusting and folding occurred during the Turonian. Progressive elimination and eventual closure of the ocean preceded the thrusting of northerly situated, collisiondashinduced, nappe packages over the leading edge of the Sakarya continent. The nappe-laden edge of the continental margin then collapsed and steadily subsided under the heavy load of the ophiolitic slab and the northern continental fragment. Consequently, the nappe packages and the ophiolite were collectively metamorphosed during the ConiaciandashSantonian interval. During the subsidence the main body of the Sakarya continent partially detached from its collapsed edge along a fault zone and thus suffered an independent but less severe deformation, which lasted until the uplift of the collapsed edge in the Campanian. From the late Campanian onward, throughout later orogenic stages, the metamorphic and nondashmetamorphic units amalgamated into a single tectonic entity, forming a basement for younger cover rocks.

Original languageEnglish
Pages (from-to)155-171
Number of pages17
JournalTectonophysics
Volume243
Issue number1-2
DOIs
Publication statusPublished - 15 Mar 1995

Funding

The authorsw ould like to thank the Turkish PetroleumC ompanyfor their support of this project. A number of colleaguesfr om istanbul Universitya nd the IstanbulT echnicalU niversity have contributedsi gnificantlyto this work. Prof. D. Dean and Mrs. J. Swift-Avctk indly read the first proof, improvedt he original text and sug-gestedu sefulc ommentsW. e are gratefutl o them all.

FundersFunder number
Turkish PetroleumC

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