The extensional Messaria shear zone and associated brittle detachment faults, Aegean Sea, Greece

Kumerics, Christine; Ring, Uwe; Brichau, Stéphanie; Glodny, Johannes; Monié, Patrick

doi:10.1144/0016-764904-041

Cited by 78 publications

(144 citation statements)

References 56 publications

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“…The dome shows a pervasive top-to-the-north shearing that is also well recorded in the granitic plutons (Kumerics et al, 2005;Beaudoin et al, 2015;Laurent et al, 2015). Exhumation through the ductile-to-brittle transition occurred some 12-11 Ma ago and late exhumation stages are continuously recorded until 6 Ma (Kumerics et al, 2005). The Karkinagrion two-micas granite (S-type) is closely associated with migmatitic gneiss, suggesting that it roots in a HT dome as in Mykonos-Delos or Naxos-Paros Beaudoin et al, 2015).…”

Section: Accepted M Manuscriptmentioning

confidence: 71%

“…Ikaria Island shows one I-type and two S-type Miocene plutons intruding a micaschists, marbles and gneiss dome elongated NE-SW (Boronkay and Doutsos, 1994;Photiades, 2002;Kumerics et al, 2005;Bolhar et al, 2010;Kokkalas and Aydin, 2013). HP-LT parageneses are only scarcely preserved within the dome and most of the observed deformation is related to HT-LP metamorphic conditions (600°C for less than 8 kbar) (Kumerics et al, 2005).…”

Section: Ikariamentioning

confidence: 99%

“…(Altherr et al, 1982;Henjes-Kunst et al, 1988;Wijbrans and McDougall, 1988;Schliestedt et al, 1994;Keay et al, 2001;Hejl et al, 2002;Parra et al, 2002;Ring et al, 2003;Bröcker et al, 2004;Jolivet et al, 2004a;Kumerics et al, 2005;Brichau et al, 2006;Bröcker and Franz, 2006;Duchêne et al, 2006;Martin et al, 2006;Brichau et al, 2007;Skarpelis et al, 2008;Baltatzis et al, 2009;Iglseder et al, 2009;Liati et al, 2009;Seward et al, 2009;Bolhar et al, 2010;Brichau et al, 2010;Denèle et al, 2011;Ring et al, 2011;Schneider et al, 2011;Grasemann et al, 2012;Bargnesi et al, 2013;Berger et al, 2013;Bröcker et al, 2013;Soukis and Stockli, 2013;Beaudoin et al, 2014;Huet et al, 2014;Laurent et al, 2015) A C C E P T E D M A N U S C R I P T…”

Section: -Geological Contextunclassified

“…HP-LT parageneses are only scarcely preserved within the dome and most of the observed deformation is related to HT-LP metamorphic conditions (600°C for less than 8 kbar) (Kumerics et al, 2005). Recent estimates of the maximum…”

Section: Ikariamentioning

confidence: 99%

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The geological signature of a slab tear below the Aegean

et al. 2015

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Mediterranean Highlights-Rotation of Hellenides is coeval with granite migration -Migration of granitoids signs a slab tear in the Cyclades -HT domes and a left-lateral gradient of extension also sign the tear AbstractIn this paper we explore the geology of the Aegean region in the Miocene to identify the geological signature of a first-order slab tear observed in all tomographic models. From 15 to 8 Ma, the tear is associated, spatially and timely, with a fast clockwise rotation of the External Hellenides, alkaline volcanism, high-temperature metamorphic domes with a predominance of north-dipping detachments, south-westward migration of granitoids intrusions. These features suggest a warmer geodynamic environment during the rotation and the impact of a hot mantle flow associated with the tear. The ~8 Ma duration between the first hightemperature metamorphic domes in the centre of the archipelago and the beginning of the fast rotation may correspond to the time needed for the slab to bend, stretch and finally tear.

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Section: Accepted M Manuscriptmentioning

confidence: 71%

Section: Ikariamentioning

confidence: 99%

Section: -Geological Contextunclassified

Section: Ikariamentioning

confidence: 99%

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The geological signature of a slab tear below the Aegean

et al. 2015

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“…The stretching lineations span a circle segment with a center near the intersection point of the Alaşehir and Büyük Menderes detachments. To the west, extension becomes partitioned over several time-overlapping and time-consecutive extensional shear zones in, e.g., the Kazdağ massif [Okay and Satir, 2000;Cavazza et al, 2009], Samos [Ring et al, 1999b;Kumerics et al, 2005], Ikaria [Kumerics et al, 2005] and Kos [van Hinsbergen and Boekhout, 2009] (Figures 2 and 3). …”

Section: Rotations and Regional Structural Grainmentioning

confidence: 99%

Exhumation with a twist: Paleomagnetic constraints on the evolution of the Menderes metamorphic core complex, western Turkey

et al. 2010

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Much remains to be understood about the links between regional vertical axis rotations, continental extension, and shortening. In western Turkey, Miocene vertical axis rotations have been reported that occur simultaneously with the extensional exhumation of the Menderes metamorphic core complex, which has been related to back‐arc extension in the eastern part of the Aegean back arc. In this paper we explore the spatial and temporal relationships between vertical axis rotations in southwestern Turkey and extensional unroofing of the Menderes Massif. To this end, we provide a large set of new paleomagnetic data from western Turkey, and integrate these with the regional structural evolution to test the causes and consequences of oroclinal bending in the Aegean region. The Lycian Nappes and Bey Dağları are shown to rotate ∼20° between 16 and 5 Ma, defining the eastern limb of the Aegean orocline. This occurred contemporaneously with the exhumation of the central Menderes Massif (along extensional detachments) and after the latest Oligocene to early Miocene exhumation of the northern and southern Menderes massifs. Exhumation of the latter two was not associated with vertical axis rotations. The lower Miocene volcanics in the region from Lesbos to Uşak, to the north of the central Menderes Massif underwent a small clockwise rotation, insignificant with respect to Eurasia. This shows that exhumation of the central Menderes Massif was associated with a vertical axis rotation difference between the northern and southern Menderes massifs of ∼25°–30°. This result is in excellent agreement with the angle defined by the trends of Büyük Menderes and Alaşehir detachments, as well as the angle defined by the regionally curving stretching lineation pattern across the central Menderes Massif. These structures define a pivot point (rotation pole) for the west Anatolian rotations. The rotation of the southern domain, including the southern Menderes Massif, the Lycian Nappes, and Bey Dağları, must have led to N–S contraction east of this pole. The eastern limit of the rotating domain is formed by the transpressional couple of the Aksu thrust and Kırkkavak Fault in the center of the Isparta angle. Previously reported clockwise rotations in the volcanic fields near Afyon may be the result of distributed N–S shortening east of the pivot point. The precise accommodation of this shortening history remains open for investigation. Late Oligocene to early Miocene extension in the eastern part of the Aegean back arc was NE–SW oriented and likely bounded by a discrete transform. This transform may be associated with an early evolution of the eastern Aegean subduction transform edge propagator fault. Oroclinal bending in the west Anatolian region is likely related to a reconnection of the eastern part of the Aegean orocline with the African northward moving plate in tandem with roll back in the Aegean back arc, comparable to a recently postulated scenario for western Greece.

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Interactions between plutonism and detachments during metamorphic core complex formation, Serifos Island (Cyclades, Greece)

et al. 2015

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In order to better understand the interactions between plutonic activity and strain localization during metamorphic core complex formation, the Miocene granodioritic pluton of Serifos (Cyclades, Greece) is studied. This pluton (11.6-9.5 Ma) intruded the Cycladic Blueschists during thinning of the Aegean domain along a system of low-angle normal faults belonging to the south dipping West Cycladic Detachment System (WCDS). Based on structural fieldwork, together with microstructural observations and anisotropy of magnetic susceptibility, we recognize a continuum of deformation from magmatic to brittle conditions within the magmatic body. This succession of deformation events is kinematically compatible with the development of the WCDS. The architecture of the pluton shows a marked asymmetry resulting from its interaction with the detachments. We propose a tectonic scenario for the emplacement of Serifos pluton and its subsequent cooling during the Aegean extension: (1) A first stage corresponds to the metamorphic core complex initiation and associated southwestward shearing along the Meghàlo Livadhi detachment. (2) In the second stage, the Serifos pluton has intruded the dome at shallow crustal level, piercing through the ductile/brittle Meghàlo Livadhi detachment. Southwest directed extensional deformation was contemporaneously transferred upward in the crust along the more localized Kàvos Kiklopas detachment. (3) The third stage was marked by synmagmatic extensional deformation and strain localization at the contact between the pluton and the host rocks resulting in nucleation of narrow shear zones, which (4) continued to develop after the pluton solidification.

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The extensional Messaria shear zone and associated brittle detachment faults, Aegean Sea, Greece

Cited by 78 publications

References 56 publications

The geological signature of a slab tear below the Aegean

The geological signature of a slab tear below the Aegean

Exhumation with a twist: Paleomagnetic constraints on the evolution of the Menderes metamorphic core complex, western Turkey

Interactions between plutonism and detachments during metamorphic core complex formation, Serifos Island (Cyclades, Greece)

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