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Title: Pre-Late Jurassic tectonic-sedimentary evolution of North Tethys, Central Pontides, N. Turkey
Author: Ustaömer, Timur
Awarding Body: University of Edinburgh
Current Institution: University of Edinburgh
Date of Award: 1993
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Pre-Late Jurassic basement of the Central Pontides comprises a thick subduction-accretion complex, amalgamated since Late Palaeozoic. Detailed structural, sedimentological and geochemical studies reveal a number of major tectonic units, assembled through plate tectonics processes. Two oceanic basins are recognised, separated by two different tectonic units. The first is the Devrekani Metamorphic Unit, gneisses and amphibolites at the base, transgressively overlain by metamorphosed carbonates. This unit is interpreted as basement of a rifted south Eurasian margin fragment. The cover of this unit may be represented by the Palaeozoic of Istanbul and Early Mesozoic sequences of the W Pontides. The second unit is the Cangaldav g Complex, a 10 km-thick, imbricated pile of evolved volcanics and volcaniclastics, overlying oceanic basement, comprising sheeted dykes and basic lavas. This unit is interpreted as a Late Palaeozoic south-facing oceanic arc. The northern oceanic basin is represented by the Küe Complex, a structurally thickened wedge of siliciclastic turbidites, interleaved with a dismembered, supra-subduction zone ophiolite. The Küe Complex is interpreted as a Triassic to Early-Mid Jurassic subduction-accretion complex of southward polarity. The southerly basin is represented by the Domuzdav g-Saraycikdav g Unit, a Palaeozoic-Early Mesozoic subduction-accretion complex of northward polarity, comprising an ophiolitic melange in the north and an accretionary prism in the south, both metamorphosed to blueschist facies. Meta-basites are of MORB type. Structurally beneath is a collapsed Permian carbonate platform, together with its passive margin sequences, both to the north and south. Lavas associated with these passive margin sequences are of within plate-type without an identifiable subduction component. In the proposed model, Palaeotethys was subducted northwards under an active Eurasian margin during Late Palaeozoic time, giving rise to a near continental margin arc. A continental sliver was rifted off (Devrekani), related to transform and/or active margin processes, opening the Küe Basin as a back-arc basin in latest Palaeozoic-earliest Mesozoic time.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available