Old domains in the South Adria plate and their relationship with the West Hellenic front

Ben, Anna Del; Mocnik, Arianna; Volpi, V.; Karvelis, P.

doi:10.1016/j.jog.2015.06.003

Cited by 35 publications

(36 citation statements)

References 38 publications

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“…The Moho depth is approximated from Chamot‐Rooke, Rangin, et al (). The transition from the Ionian Basin to the Apulian platform across the Apulian escarpment follows our interpretation of ARCHIMEDE 31 (Figure a) and complementary observations from Argnani (), Del Ben et al (), Chamot‐Rooke, Rangin, et al (), and Minelli and Faccenna ().…”

Section: Deep Structure Of the Ionian Basin And Of Its Margins: Regiosupporting

confidence: 85%

“…Tectonics We use these constraints to interpret the ARCHIMEDE 31 profile, which crosses the scarp at the edge of the Apulian platform toward the Ionian basin ( Figure 6). This transition is documented in several studies (Catalano et al, 2001;Del Ben et al, 2015;Finetti, 1982;Minelli & Faccenna, 2010) providing reasonable constraints over the Apulian platform despite the low quality of the profile. The sedimentary sequences of the Ionian Basin are observable discontinuously beneath the allochthonous Calabrian prism between~6-and~8.5-s twtt (Figure 6a).…”

Section: 1029/2018tc005472mentioning

confidence: 78%

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Geology of the Ionian Basin and Margins: A Key to the East Mediterranean Geodynamics

et al. 2019

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We revisit the nature, structure, and evolution of the Ionian Basin and its surrounding passive margins (Apulia, Eastern Sicily/Malta, and Cyrenaica margins). Relying on geological observations (wells, dredges, and dives) and seismic calibrations from the surrounding platforms and escarpments, we present age correlations for the deepest sedimentary sequences of the Ionian Basin. Two‐ship deep refraction seismic data combined with reprocessed reflection seismic data enable us to identify, characterize, and map these thick sedimentary sequences and to present a consistent seismic stratigraphy across the basin. At a larger scale, we present new geological transects illustrating the tectonostratigraphic relationships between the Ionian Basin and its surrounding rifted margins. On this basis, we suggest that a Late Triassic‐Early Jurassic rifting preceded the late Early Jurassic to Middle Jurassic formation of the Ionian Basin. The combination of geophysical and geological arguments suggests that the entire deep basin is floored with oceanic crust of normal thickness, but with high seismic velocity in the upper part. Upscaling our results in the framework of the eastern Mediterranean, we propose that the Ionian Basin represents the remnant of a short‐lived oceanic basin resulting from the interaction between two propagating oceans: the Central Atlantic and the Neo‐Tethys.

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Section: Deep Structure Of the Ionian Basin And Of Its Margins: Regiosupporting

confidence: 85%

Section: 1029/2018tc005472mentioning

confidence: 78%

Geology of the Ionian Basin and Margins: A Key to the East Mediterranean Geodynamics

et al. 2019

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“…As such, the Apulian escarpment represents the continuation, past the tip of the KTF, of the boundary between oceanic crust of the Ionian sea and the continental crust of the Adriatic plate (Finetti & Del Ben, ). But unlike the KTF, which is very active seismically, the Apulian escarpment is characterized as a passive margin without significant seismicity (Del Ben et al, ; Finetti & Del Ben, ).…”

Section: Geodynamic Settingmentioning

confidence: 99%

“…Based on these and other onshore‐offshore profiles across Crete (Bohnhoff et al, ), the crust entering the trench in the southern part of the WHSZ appears to have an average thickness of 7 km and to be clearly oceanic in nature. In contrast, to the north, offshore profiles across the Adriatic sea have imaged a 19 km to 30 km thick crystalline crust (Del Ben et al, ; Finetti & Del Ben, ) moving toward the trench. Active source experiments have also been used to constrain the subducted slab at depth—for example, Zelt et al () identified reflected signals from the top of the slab at 70 km depth beneath the Gulf of Corinth.…”

Section: Geodynamic Settingmentioning

confidence: 99%

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Seismicity, Deformation, and Metamorphism in the Western Hellenic Subduction Zone: New Constraints From Tomography

2018

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The Western Hellenic Subduction Zone is characterized by a transition from oceanic to continental subduction. In the southern oceanic portion of the system, abundant seismicity reaches depths of 100 km to 190 km, while the northern continental portion rarely exhibits deep earthquakes. Our study investigates how this oceanic‐continental transition affects fluid release and related seismicity along strike. We present results from local earthquake tomography and double‐difference relocation in conjunction with published images based on scattered teleseismic waves. Our tomographic images recover both subducting oceanic and continental crusts as low‐velocity layers on top of high‐velocity mantle. Although the northern and southern trenches are offset along the Kephalonia Transform Fault, continental and oceanic subducting crusts appear to align at depth. This suggests a smooth transition between slab retreat in the south and slab convergence in the north. Relocated hypocenters outline a single‐planed Wadati‐Benioff Zone with significant along‐strike variability in the south. Seismicity terminates abruptly north of the Kephalonia Transform Fault, likely reflecting the transition from oceanic to continental subducted crust. Near 90 km depth, the low‐velocity signature of the subducting crust fades out and the Wadati‐Benioff Zone thins and steepens, marking the outline of the basalt‐eclogite transition. Subarc melting of the mantle is only observed in the southernmost sector of the oceanic subduction, below the volcanic part of the arc. Beneath the nonvolcanic part, the overriding crust appears to have undergone large‐scale silica enrichment. This enrichment is observed as an anomalously low Vp/Vs ratio and requires massive transport of dehydration‐derived fluids updip through the subducting crust.

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Neotectonics and Recent Paleogeography

Papanikolaou¹

2021

The Geology of Greece

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Old domains in the South Adria plate and their relationship with the West Hellenic front

Cited by 35 publications

References 38 publications

Geology of the Ionian Basin and Margins: A Key to the East Mediterranean Geodynamics

Geology of the Ionian Basin and Margins: A Key to the East Mediterranean Geodynamics

Seismicity, Deformation, and Metamorphism in the Western Hellenic Subduction Zone: New Constraints From Tomography

Neotectonics and Recent Paleogeography

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