Evolution of the Serifos Metamorphic Core Complex

Grasemann, Bernhard; Petrakakis, Konstantin

doi:10.3809/jvirtex.2007.00170

Cited by 41 publications

(101 citation statements)

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“…The MCCs of the northern and the central Cyclades exhibit top-to-thenorth movements in the lower plate (Figure 15a). The topto-the-south deformation described in the western Cyclades (Figure 15a) [Grasemann and Petrakakis, 2007] is partly posterior to the Serifos intrusive that yielded ages between 8 and 9 Ma [Iglseder et al, 2009]. LT chronology indicates that at this time the northern, the central and the southern Cyclades were almost totally exhumed [Brichau, 2004;Brichau et al, 2008].…”

Section: Implications For the Dynamic Of The Aegean Subduction Zonementioning

confidence: 90%

“…In the HUET ET AL. : THRUST VERSUS DETACHMENT IN THE AEGEAN western Cyclades (Kea, Kithnos, Serifos), the observed sense of shear is top-to-the-southwest [Grasemann and Petrakakis, 2007]. The upper Cycladic nappe is not present on these latter islands and thus, strictly speaking, there is no detachment there but rather a brittle-ductile deformation with a top-tothe-southwest shear sense within the same unit.…”

Section: Geodynamic Settingmentioning

confidence: 98%

“…Nevertheless, all later papers [e.g., Gautier et al, 1990;Buick, 1991;Faure et al, 1991;Gautier and Brun, 1994a;Jolivet and Patriat, 1999;Mehl et al, 2007], dealing with islands where a detachment showing a clear metamorphic gap between an upper and a lower plate was observed, described the detachments as north dipping and the shear sense in the lower plate as top-to-the-north, even in Naxos. The recent description of top-to-the-south kinematics indicators in the western Cyclades [Grasemann and Petrakakis, 2007] tends to render the overall picture more symmetrical. The tectonic meaning of the major tectonic contact on Ios island described as extensional [Vandenberg and Lister, 1996;Forster and Lister, 1999a] becomes crucial in this discussion.…”

Section: Introductionmentioning

confidence: 99%

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Thrust or detachment? Exhumation processes in the Aegean: Insight from a field study on Ios (Cyclades, Greece)

2009

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[1] Whether back-arc extension in the Aegean is symmetric or asymmetric at the regional scale is a key question to the understanding of the dynamics of back-arc extension. New field observations, structural analysis of finite and instantaneous strain, and their relationship with metamorphism on Ios island (Cyclades) lead us to investigate the significance of the South Cycladic Shear Zone (SCSZ). Two successive tectonometamorphic events have been documented in the hanging wall and the footwall of the SCSZ. First, penetrative top-to-the-south shearing is observed in the upper Cycladic Blueschists and the lower Cycladic Basement close to their contact. It is expressed in the hanging wall by shear bands and pressure shadows associated to blueschist facies minerals, contemporaneous with overthrusting of the Cycladic Blueschists over the basement unit. Second, large extensional top-to-the-north shear zones lately crosscut the whole stack. These constraints allow us to reinterpret the kinematics of the Aegean domain during synorogenic and postorogenic periods. When replaced in the reconstructed geometry of the Hellenic Eocene orogenic wedge, the observed top-to-the-south thrusting is coeval with extensional shear zones observed in Syros that could represent the roof of the Cycladic Blueschists. An extrusion structure is then proposed for the exhumation of the Cycladic Blueschists in the subduction zone. Top-to-the-north asymmetric extension together with the Andros-TinosMykonos and Paros-Naxos detachments can be correlated to Oligo-Miocene extension in the back-arc domain. Citation: Huet, B

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Section: Implications For the Dynamic Of The Aegean Subduction Zonementioning

confidence: 90%

Section: Geodynamic Settingmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

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Thrust or detachment? Exhumation processes in the Aegean: Insight from a field study on Ios (Cyclades, Greece)

2009

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“…Kea and Kythnos mostly show the Cycladic Blueschists exhumed below the WCDS (Grasemann and Petrakakis, 2007;Iglseder et al, 2011;Grasemann et al, 2012;Rice et al, 2012). Similarly to the NCDS, the WCDS shows a progressive deformation from ductile to brittle during footwall exhumation, but with an opposite shear sense, top-to-the SW. As one additional difference with the northern Cyclades, the western Cyclades show an intense retrogression of the Cycladic Blueschists in the greenschist-facies and poor preservation of the Eocene HP-LT metamorphism.…”

Section: Kea and Kythnosmentioning

confidence: 99%

“…Serifos Island displays a metamorphic core complex and a granodioritic intrusion exhumed below two detachments (Altherr and Siebel, 2002;Grasemann and Petrakakis, 2007;Iglseder et al, 2009;St. Seymour et al, 2009;Tschegg and Grasemann, 2009;Stouraiti et al, 2010;Grasemann et al, 2012 .…”

Section: Accepted M Manuscriptmentioning

confidence: 99%

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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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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Evolution of the Serifos Metamorphic Core Complex

Cited by 41 publications

References 0 publications

Thrust or detachment? Exhumation processes in the Aegean: Insight from a field study on Ios (Cyclades, Greece)

Thrust or detachment? Exhumation processes in the Aegean: Insight from a field study on Ios (Cyclades, Greece)

The geological signature of a slab tear below the Aegean

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

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