Variations in fault-slip data and cooling history reveal corridor of heterogeneous backarc extension in the eastern Aegean Sea region

Uwe Ring, Klaus Gessner, Stuart Thomson

    Research output: Contribution to journalArticle

    7 Citations (Scopus)

    Abstract

    We report fault-slip data across the boundary between the highly extended and largely submerged crust underlying the Aegean Sea from Samos in the north to eastern Crete in the south, and the much less extended and emergent crust of western Anatolia. We identify three brittle deformation increments, a late Miocene (mainly Pliocene) to Recent crustal stretching increment, an intermittent early to late Miocene shortening increment concurrent with extension and magmatism, and a Miocene extensional event. The youngest increment documents late Miocene to Recent NNE extension over large areas, but can locally also be oriented SE (Amorgos and Astipalea Islands), and ESE (eastern Crete) suggesting overall oblate strain geometry. The intermittent Miocene (~ 24–5 Ma) fault-slip records suggest overall prolate strain geometry, where NNE stretching is accompanied by E–W shortening. The older extension event is mainly NNE directed but on Samos Island extension is E–W, probably reflecting local extension in a sinistral wrench corridor in the early/mid Miocene. Overall it seems that since the early Miocene NNE-trending extension is the dominant regime in the eastern Aegean with an intermittent component of short-lived E–W shortening. The existence of a corridor of heterogeneous crustal deformation – which is spatially associated with uncharacteristically old fission track ages – and the apparent change in strain geometry in time challenge concepts that propose that the eastern Aegean Sea and western Anatolia have been deformed as a continuous tectonic domain since the Miocene. We propose that the regional variation in extensional strain geometry resulted from a sinistral wrench component that was superimposed on the regional ‘background’ NNE extension by translation across a diffuse plate boundary. We conclude that the eastern shoreline of the Aegean Sea is controlled by a Miocene to Recent sinistral wrench corridor that accommodated movement between different lithospheric domains.

    Original languageEnglish
    Pages (from-to)108-130
    Number of pages23
    JournalTectonophysics
    Volume700-701
    DOIs
    Publication statusPublished - 20 Mar 2017

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    corridors
    fault slip
    Pliocene
    slip
    histories
    cooling
    wrenches
    history
    Samos
    geometry
    crusts
    shorelines
    crust
    corridor
    sea
    brittle deformation
    fission
    crustal deformation
    tectonics
    plate boundary

    Cite this

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    abstract = "We report fault-slip data across the boundary between the highly extended and largely submerged crust underlying the Aegean Sea from Samos in the north to eastern Crete in the south, and the much less extended and emergent crust of western Anatolia. We identify three brittle deformation increments, a late Miocene (mainly Pliocene) to Recent crustal stretching increment, an intermittent early to late Miocene shortening increment concurrent with extension and magmatism, and a Miocene extensional event. The youngest increment documents late Miocene to Recent NNE extension over large areas, but can locally also be oriented SE (Amorgos and Astipalea Islands), and ESE (eastern Crete) suggesting overall oblate strain geometry. The intermittent Miocene (~ 24–5 Ma) fault-slip records suggest overall prolate strain geometry, where NNE stretching is accompanied by E–W shortening. The older extension event is mainly NNE directed but on Samos Island extension is E–W, probably reflecting local extension in a sinistral wrench corridor in the early/mid Miocene. Overall it seems that since the early Miocene NNE-trending extension is the dominant regime in the eastern Aegean with an intermittent component of short-lived E–W shortening. The existence of a corridor of heterogeneous crustal deformation – which is spatially associated with uncharacteristically old fission track ages – and the apparent change in strain geometry in time challenge concepts that propose that the eastern Aegean Sea and western Anatolia have been deformed as a continuous tectonic domain since the Miocene. We propose that the regional variation in extensional strain geometry resulted from a sinistral wrench component that was superimposed on the regional ‘background’ NNE extension by translation across a diffuse plate boundary. We conclude that the eastern shoreline of the Aegean Sea is controlled by a Miocene to Recent sinistral wrench corridor that accommodated movement between different lithospheric domains.",
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    Variations in fault-slip data and cooling history reveal corridor of heterogeneous backarc extension in the eastern Aegean Sea region. / Ring, Uwe; Gessner, Klaus; Thomson, Stuart.

    In: Tectonophysics, Vol. 700-701, 20.03.2017, p. 108-130.

    Research output: Contribution to journalArticle

    TY - JOUR

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    AB - We report fault-slip data across the boundary between the highly extended and largely submerged crust underlying the Aegean Sea from Samos in the north to eastern Crete in the south, and the much less extended and emergent crust of western Anatolia. We identify three brittle deformation increments, a late Miocene (mainly Pliocene) to Recent crustal stretching increment, an intermittent early to late Miocene shortening increment concurrent with extension and magmatism, and a Miocene extensional event. The youngest increment documents late Miocene to Recent NNE extension over large areas, but can locally also be oriented SE (Amorgos and Astipalea Islands), and ESE (eastern Crete) suggesting overall oblate strain geometry. The intermittent Miocene (~ 24–5 Ma) fault-slip records suggest overall prolate strain geometry, where NNE stretching is accompanied by E–W shortening. The older extension event is mainly NNE directed but on Samos Island extension is E–W, probably reflecting local extension in a sinistral wrench corridor in the early/mid Miocene. Overall it seems that since the early Miocene NNE-trending extension is the dominant regime in the eastern Aegean with an intermittent component of short-lived E–W shortening. The existence of a corridor of heterogeneous crustal deformation – which is spatially associated with uncharacteristically old fission track ages – and the apparent change in strain geometry in time challenge concepts that propose that the eastern Aegean Sea and western Anatolia have been deformed as a continuous tectonic domain since the Miocene. We propose that the regional variation in extensional strain geometry resulted from a sinistral wrench component that was superimposed on the regional ‘background’ NNE extension by translation across a diffuse plate boundary. We conclude that the eastern shoreline of the Aegean Sea is controlled by a Miocene to Recent sinistral wrench corridor that accommodated movement between different lithospheric domains.

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