Deep structure and active tectonics of the southern Aegean volcanic arc

Papazachos, B. C.; Dimitriadis, S.; Panagiotopoulos, Dimitris; Papazachos, C. B.; Papadimitriou, Eleftheria

doi:10.1016/s1871-644x(05)80032-4

Cited by 33 publications

(33 citation statements)

References 37 publications

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“…But we must bear in mind that back arc volcanism does not respond immediately to beginning subduction. To be dehydrated and to induce partial melting of the overlying mantle wedge, the subducted material of the oceanic slab must be heated to at least 700°C that can be achieved by a minimum burial depth of about 100 km [ Papazachos et al , 2005]. In the case of SAAVA, the oceanic material of the African plate must overcome a horizontal distance of at least 200 km underneath the Aegean‐Anatolian microplate to induce partial melting under the volcanic centers of the arc.…”

Section: Discussionmentioning

confidence: 99%

“…On the basis of the results of seismic tomography, Papazachos et al [2005] have suggested that the primary magma reservoirs of the SAAVA are in the asthenospheric mantle wedge between the subducted Mediterranean slab (i.e., oceanic crust of the African plate) and the overriding Aegean slab (i.e., the Aegean‐Anatolian microplate) at depths between 60 and 90 km. The occurrence of both the low‐velocity mantle layer, at depths between 60 and 90 km, and of the low‐seismicity dipping oceanic crust, at depths between 110 and 140 km, are strong arguments for this hypothesis, which is in agreement with geochemical data.…”

Section: Discussionmentioning

confidence: 99%

“…The values of H [km] are indicated in Figure 20b for each individual volcanic center, D is supposed to be about 120 km for each volcanic center [cf. Papazachos et al , 2005], and V is approximately 30 km/Ma. Thus, we obtain approximate time gaps of 7.9, 7.8, 8.5, and 10.9 Ma for Methana‐Aegina, Milos, Santorini‐Christiana, and Kos, respectively.…”

Section: Discussionmentioning

confidence: 99%

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Fission‐track thermochronology, vertical kinematics, and tectonic development along the western extension of the North Anatolian Fault zone

Hejl¹,

Bernroider²,

Parlak³

et al. 2010

J. Geophys. Res.

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We have investigated the low‐temperature history of pre‐Neogene basement areas adjacent to the western extension of the North Anatolian Fault zone (NAFZ) by apatite fission track thermochronology of 33 samples taken from Marmara island, Kapidag peninsula (both in the Sea of Marmara), Samothrake island, and Chalkidike peninsula (both in the North Aegean region). Together with already published apatite fission track data from 30 other sampling localities of the region, these data (63 in total) have been evaluated mainly with regard to the transitional period from the Mesohellenic orogeny (Eocene‐Oligocene) to the plate‐tectonical individualization of the Aegean‐Antolian microplate, to gain a better understanding of the tectonical chronology that has led to modern east Mediterranean plate tectonics. Apatite fission track investigations of the area under discussion reveal two major events of cooling and exhumation of pre‐Neogene rocks. A first frequency maximum of cooling ages between 35 and 25 Ma (late Eocene to early Oligocene) is due to postorogenic regional erosion after the climax of the Mesohellenic orogeny, which was caused by continental collision of the Pelagonian platform and the Rila‐Rhodope zone after the final closure of the Axios‐Vardar Ocean. A second frequency maximum of cooling ages between 17 and 11.5 Ma (early to middle Miocene) depicts more localized uplift and exhumation in consequence of transpressive and/or transtensive movements along early structural discontinuities that gave rise to the later fault systems in the western extension of the NAFZ. The earliest fault structures of this system have developed shortly after the orogenic collapse and crustal extension of the Rila‐Rhodope area but quasi simultaneously with the onset of subduction along the modern Hellenic trench. The regional distribution of fission track ages of the Miocene age group (17 to 11.5 Ma), and corresponding thermochronological calculations based on frequency distributions of confined track lengths suggest that an early fault propagation has occurred from east to west during the Miocene. The onset of subduction along the Hellenic trench and subsequent gravitational retreat of the subducting oceanic slab are considered as a major cause for transtension of the Aegean crust, especially with regard to the development of north Aegean pull‐apart basins. Such early fault structures have facilitated the westward propagation of a continuous NAFZ that took place during the Pliocene from the easternmost Marmara region to the Gallipoli peninsula and to the North Aegean trough.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

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Fission‐track thermochronology, vertical kinematics, and tectonic development along the western extension of the North Anatolian Fault zone

Hejl¹,

Bernroider²,

Parlak³

et al. 2010

J. Geophys. Res.

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“…Velocities correlate well with a hot mantle, explained as the result of convection from the asthenosphere through a N-S vertical tear separating the HSZ from the Western Cyprus Subduction Zone (e.g., van Hinsbergen et al 2010;Biryol et al 2011;Legendre et al 2012;Govers & Fichtner, 2016), or a horizontal tear (Faccenna et al 2014). There is no indication for a horizontal slab tear or slab break-off (Faccenna et al 2014) given the continuously distributed seismicity, in contrast to Papazachos et al (2005), who observed lack of seismicity at depths between 90 and 140 km. Our compiled catalogue does not exhibit lack of seismicity at these depths, but on the contrary, it demonstrates that the deep part of the slab, between 100 and 150 km, hosts the major part of seismicity, especially at the easternmost part of the HSZ.…”

Section: Vertical Tearingmentioning

confidence: 74%

Deep structure of the Hellenic lithosphere from teleseismic Rayleigh-wave tomography

Kassaras

Kapetanidis

Karakonstantis

et al. 2020

Geophysical Journal International

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SUMMARY This research provides new constraints on the intermediate depth upper-mantle structure of the Hellenic lithosphere using a three-step Rayleigh-wave tomography. Broadband waveforms of about 1000 teleseismic events, recorded by ∼200 permanent broad-band stations between 2010 and 2018 were acquired and processed. Through a multichannel cross-correlation technique, the fundamental mode Rayleigh-wave phase-velocity dispersion curves in the period range 30–90 s were derived. The phase-velocities were inverted and a 3-D shear velocity model was obtained down to the depth of 140 km. The applied method has provided 3-D constraints on large-scale characteristics of the lithosphere and the upper mantle of the Hellenic region. Highlighted resolved features include the continental and oceanic subducting slabs in the region, the result of convergence between Adria and Africa plates with the Aegean. The boundary between the oceanic and continental subduction is suggested to exist along a trench-perpendicular line that connects NW Peloponnese with N. Euboea, bridging the Hellenic Trench with the North Aegean Trough. No clear evidence for trench-perpendicular vertical slab tearing was resolved along the western part of Hellenic Subduction Zone; however, subcrustal seismicity observed along the inferred continental–oceanic subduction boundary indicates that such an implication should not be excluded. The 3-D shear velocity model supports an N–S vertical slab tear beneath SW Anatolia that justifies deepening, increase of dip and change of dip direction of the Wadati-Benioff Zone. Low velocities found at depths <50 km beneath the island and the backarc, interrelated with recent/remnant volcanism in the Aegean and W. Anatolia, are explained by convection from a shallow asthenosphere.

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“…In the Hellenic Trench the tensional field causes low dip angle thrust faults trending NW-SE and dipping NE (Fytikas and Vougioukalakis, 2005), while in the volcanic arc the crust is dominated by a tensional field with a NW-SE direction, resulting in normal faults which strike NE-SW. (e.g. Jolivet et al, 2003;Papazachos et al, 2005). In Santorini, the exposed schists and phyllites at Athinios have shown Miocene (10.9 ± 0.7Ma, ZFT; 9.4 ± 0.3 Ma, AHe) and Eocene (46.3± 2.8 Ma, ZFT; 49.34 ± 2.9 Ma, AHe) exhumation ages (Marsellos et al, 2013) implying a thermal reset in Miocene which is possibly related to a granitic intrusion that took place at 9.5 Ma (Skarpelis et al, 1992).…”

Section: Santorini Tectonic and Geological Settingmentioning

confidence: 99%

Implications of Petrography and Geochemistry of Athinios Metamorphic Units Using PXRF and Gis Analyses in Thera (Santorini, Greece).

Pasqualon¹,

Santos²,

Marsellos³

et al. 2017

geosociety

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Deep structure and active tectonics of the southern Aegean volcanic arc

Cited by 33 publications

References 37 publications

Fission‐track thermochronology, vertical kinematics, and tectonic development along the western extension of the North Anatolian Fault zone

Fission‐track thermochronology, vertical kinematics, and tectonic development along the western extension of the North Anatolian Fault zone

Deep structure of the Hellenic lithosphere from teleseismic Rayleigh-wave tomography

Implications of Petrography and Geochemistry of Athinios Metamorphic Units Using PXRF and Gis Analyses in Thera (Santorini, Greece).

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