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

Huet, Benjamin; Labrousse, Loïc; Jolivet, Laurent

doi:10.1029/2008tc002397

Cited by 89 publications

(199 citation statements)

References 101 publications

(203 reference statements)

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“…In recent years the importance of top-to-the-south displacing detachments at the southern end of the Cyclades horst (South Ios, Sikinos, Serifos, Kithnos) and their role in the opening of the Sea of Crete have become better known (Vandenberg & Lister 1996;Ring et al 2001a;Lenauer et al 2008;Huet et al 2009; Thomson et al 2009;Brichau et al 2010). The earliest of these top-to-the-south extensional faults is the Ios Detachment, with movement at c. 19-18 Ma ).…”

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confidence: 94%

Normal faulting on Sifnos and the South Cycladic Detachment System, Aegean Sea, Greece

Ring

Glodny

Will

et al. 2011

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We constrain the timing and kinematics of normal faulting on Sifnos, Cyclades, Greece. Penetrative top-to-the-NE kinematic indicators associated with a shallow dipping foliation occur in the deepest tectonic unit (Greenschist Unit). Combined P-T analysis and Rb-Sr dating indicates that this deformation was under way by 29.4 AE 3.4 Ma at P-T conditions of c. 16 kbar and c. 550 8C, and continued to operate at least until 22.8 AE 0.2 Ma at P-T conditions of c. 8 kbar and c. 400 8C. The later top-to-the-south directed Sifnos Detachment developed at the top of the Greenschist Unit and cuts the top-to-the-NE structures. Zircon fissiontrack ages suggest that deformation on the Sifnos Detachment was largely terminated by about 13-10 Ma. Subsequent extension was accommodated by high-angle normal faults. Regionally the top-to-the-south detachment phase on Sifnos correlates with top-to-the-south extensional faulting on nearby Serifos, which started there at c. 15-13 Ma. Top-to-the-south extensional shearing on Ios to the SE commenced earlier at c. 19-18 Ma, suggesting that top-to-the-south extension propagated westward from Ios to Sifnos and Serifos, or that extension was partitioned into different top-to-the-south detachment systems that operated at different times. Collectively these top-to-the-south detachments are named here the South Cycladic Detachment System, which played a key role in the opening of the Cretan Sea forearc basin.

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confidence: 94%

Normal faulting on Sifnos and the South Cycladic Detachment System, Aegean Sea, Greece

Ring

Glodny

Will

et al. 2011

JGS

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“…The latter was partly accreted to the Pelagonian nappe contributing to the building of the Hellenides, while its buried part underwent early Eocene HP-LT metamorphism recorded in the Cycladic Blueschists unit and the Cycladic basement [Bonneau and Kienast, 1982;Bonneau, 1984;Wijbrans and McDougall, 1988;Tomaschek et al, 2003;Lagos et al, 2007]. These units were then progressively exhumed up to the end of the Eocene in the Cyclades and in the Olympos, Ossa and Pelion tectonic windows as a synorogenic extrusion wedge bounded by the Vari detachment on top (in Syros) and the SCSZ at the base (in Ios) (figure 9) Ring et al, , 2010Brun and Faccenna, 2008;Huet et al, 2009;Jolivet and Brun, 2010].…”

Section: A Continuous Subduction Migrating Southwardmentioning

confidence: 99%

“…In the Ios island, a coeval top-to-the S structure called the South Cycladic Shear Zone (SCSZ) is observed at the base of the Cycladic Blueschists unit (figure 6). This structure was interpreted first as an extensional shear zone [Lister et al, 1984] then redefined as a thrust [Huet et al, 2009]. An extrusion model was proposed for the Eocene exhumation of the Cycladic…”

Section: Accepted Manuscriptmentioning

confidence: 99%

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Kinematic reconstructions and magmatic evolution illuminating crustal and mantle dynamics of the eastern Mediterranean region since the late Cretaceous

2016

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“…For Forster and Lister (2009) extension in the southern Cyclades (Ios island) began at ~ 35 Ma, i.e. at the Eocene-Oligocene transition, whereas for Huet et al (2009) it began slightly later, at approximately 30 Ma. These two contrasted views are due to a disagreement on the interpretation of south-verging shear bands in the south of Ios island, which are thought to have formed during extension by Forster and Lister (2009) but instead during the HP-LT shortening stage according to Huet et al (2009).…”

Section: Geological Settingmentioning

confidence: 99%

Granite intrusion in a metamorphic core complex: The example of the Mykonos laccolith (Cyclades, Greece)

et al. 2011

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The Aegean domain is a well-suited place to study the formation of metamorphic core complex (MCC) and to investigate the role of syn-tectonic granites on their development. In the northern Cyclades, the Mykonos-Delos-Rhenia MCC is characterized by the intrusion of a kilometer-scale Late Miocene pluton of I-type granitoids within a migmatitic gneiss dome. New combined AMS (anisotropy of magnetic susceptibility) and microstructural studies on the Mykonos granitoids together with recently published thermochronological data allow us to use the granitoids as strain markers.The Mykonos granitoids form a laccolith-like intrusion with a N70°E long axis. The laccolith is strongly asymmetric with an outlying root zone to the SW and a major body mainly developed to the NE. The laccolith construction is due to successive pulses of more or less differentiated magma that intruded the Cycladic Blueschist Unit. The attitude of stretching markers suggests an important (about 60°) vertical-axis local rotation phenomenon in the cycladic upper crust during the exhumation of the Mykonos MCC. Structural data suggest a four-stage evolution of the Mykonos MCC: (i) a first stage characterized by flat shearing toward the N-NE and by the formation of a domal structure in migmatitic paragneisses with multi-scale generation of folds with axes either perpendicular or parallel to the regional stretching, as a result of the interplay between regional N20°E-directed extension and EW shortening; (ii) a second stage marked by the emplacement of the Mykonos laccolith at 13.5 ± 0.3 Ma at the top of the migmatitic paragneisses; (iii) the third stage corresponding to the development of protomylonitic foliations and lineations in the whole laccolith in high to medium temperature conditions; and (iv) the late stage marked by an acceleration of the exhumation of the Mykonos MCC. This exhumation was accommodated by important rotations of upper crustal blocks. During the end of the exhumation processes, around 10 Ma, deformation localized at the top of the laccolith in semi-ductile conditions and then in brittle conditions in the major detachment plane.Our study shows that the Cycladic plutonism event had no role on the initiation of the MCC. However, the geometry of the Mykonos intrusion supports that the magmas are "sucked" into the direction of regional extension and that the intrusion of magmas has caused an acceleration of the last stages of the MCC development. This acceleration was marked by a very fast exhumation of the laccolith after its emplacement.

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

Cited by 89 publications

References 101 publications

Normal faulting on Sifnos and the South Cycladic Detachment System, Aegean Sea, Greece

Normal faulting on Sifnos and the South Cycladic Detachment System, Aegean Sea, Greece

Kinematic reconstructions and magmatic evolution illuminating crustal and mantle dynamics of the eastern Mediterranean region since the late Cretaceous

Granite intrusion in a metamorphic core complex: The example of the Mykonos laccolith (Cyclades, Greece)

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