Upward extrusion and subsequent transpression as a possible mechanism for the exhumation of HP/LT rocks in Evia Island (Aegean Sea, Greece)

Xypolias, P.; Κοκκάλας, Σ.; Skourlis, Konstantinos

doi:10.1016/s0264-3707(02)00131-x

Cited by 80 publications

(147 citation statements)

References 73 publications

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“…Although the values fall in both the apparent flattening and constrictional fields, they generally lie close to the plane strain line (average k = 1.08). This is in agreement with 3D strain data reported from the Evia thrust zone in central Evia area, where an average k = 0.98 has been obtained (Xypolias et al 2003). …”

Section: Finite Strain Analysissupporting

confidence: 92%

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Patterns of Ductile Deformation in Attico-Cycladic Massif

et al. 2017

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The area of Lavrion constitutes the westernmost part of the Attico-Cycladic massif where the allochthonous Cycladic Greenschist-Blueschist unit overthrusts the para-authochthonous Basal unit. The tectonic contact of these units forms a crustal scale thrust zone which is the continuation of the Evia thrust. Our research was focused on quartz-rich schists of the overlying allochthonous unit. Combination of microstructural, finite strain data and quartz and calcite c-axis fabrics analysis was used to characterize the kinematics of rock flow within the thrust zone. The latter was formed under conditions of progressive exhumation and decompression of the high-pressure schists of the AtticoCycladic massif. A dominant top-to-the-ENE sense of shearing along the thrust zone is inferred by several shear sense criteria. The analysis of several specimens collected from various structural depths manifest that the deformation close to the thrust zone occurred under approximately plane strain conditions and was characterized by an Rxz strain ratio which fluctuates between 3 and 6.5.

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Section: Finite Strain Analysissupporting

confidence: 92%

“…These two units are separated by a major ductile thrust (Kessel, 1990;Avigad et al, 1997;Xypolias et al, 2003). Hereinafter, this zone will be referred as 'Basal thrust'; it is equivalent to the Evia thrust.…”

Section: Introductionmentioning

confidence: 99%

Patterns of Ductile Deformation in Attico-Cycladic Massif

et al. 2017

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“…A third model suggest that the rift basin that hosted the protolith of CBU was situated between the north margin of Pelagonian and the Olympos-Almyropotamos continental fragment (Fig. 5b: III;Doutsos et al, 1993;Xypolias et al, 2003). Note that the latter fragment was separated from Pelagonian forming a narrow basin with an incipient oceanic crust.…”

Section: Discussionmentioning

confidence: 99%

“…It is overlain by the Uppermost unit (Okrusch and Bröcker, 1990) and, in turn, is tectonically emplaced over either a crystalline complex of pre-Alpine rocks (Cycladic basement; e.g., Franz et al, 1993), or the Basal unit via a major ductile thrust ( Fig. 1a, b; Xypolias et al, 2003).…”

Section: Geological Settingmentioning

confidence: 99%

The Tectonostratigraphy of Cycladic Blueschist Unit on Sikinos and Sifnos: Implication for the Mesozoic Tectonic Setting

et al. 2017

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“…This block is divided by a NNE-SSW detachment fault that separates the metamorphic units to the east from the unmetamorphic units to the west [18]. This detachment passes from the Athens plain approximately along the Kifissos River [19]. Major tectonic structures and geological map of the study area, reproduced from Lekkas [17].…”

Section: Geodynamic Settingmentioning

confidence: 99%

Multi-Stack Persistent Scatterer Interferometry Analysis in Wider Athens, Greece

2017

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Abstract:The wider Athens metropolitan area serves as an interesting setting for conducting geodetic studies. On the one hand, it has a complex regional geotectonic characteristic with several active and blind faults, one of which gave the deadly M w 5.9 Athens earthquake on September 1999. On the other hand, the Greek capital is heavily urbanized, and construction activities have been taking place in the last few decades to address the city's needs for advanced infrastructures. This work focuses on estimating ground velocities for the wider Athens area in a period spanning two decades, with an extended spatial coverage, increased spatial sampling of the measurements and at high precision. The aim is to deliver to the community a reference geodetic database containing consistent and robust velocity estimates to support further studies for modeling and multi-hazard assessment. The analysis employs advanced persistent scatterer interferometry methods, covering Athens with both ascending and descending ERS-1, ERS-2 and Envisat Synthetic Aperture Radar data, forming six independent interferometric stacks. A methodology is developed and applied to exploit track diversity for decomposing the actual surface velocity field to its vertical and horizontal components and coping with the post-processing of the multi-track big data. Results of the time series analysis reveal that a large area containing the Kifisia municipality experienced non-linear motion; while it had been subsiding in the period 1992-1995 (−12 mm/year), the same area has been uplifting since 2005 (+4 mm/year). This behavior is speculated to have its origin on the regional water extraction activities, which when halted, led to a physical restoration phase of the municipality. In addition, a zoom in the area inflicted by the 1999 earthquake shows that there were zones of counter-force horizontal movement prior to the event. Further analysis is suggested to investigate the source and tectonic implications of this observation.

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Upward extrusion and subsequent transpression as a possible mechanism for the exhumation of HP/LT rocks in Evia Island (Aegean Sea, Greece)

Cited by 80 publications

References 73 publications

Patterns of Ductile Deformation in Attico-Cycladic Massif

Patterns of Ductile Deformation in Attico-Cycladic Massif

The Tectonostratigraphy of Cycladic Blueschist Unit on Sikinos and Sifnos: Implication for the Mesozoic Tectonic Setting

Multi-Stack Persistent Scatterer Interferometry Analysis in Wider Athens, Greece

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