Shallow and deep lithosphere slabs beneath the Dinarides from teleseismic tomography as the result of the Adriatic lithosphere downwelling

Šumanovac, Franjo; Markušić, Snježana; Engelsfeld, Tihomir; Jurković, Klaudia; Orešković, Jasna

doi:10.1016/j.tecto.2017.06.018

Cited by 23 publications

(35 citation statements)

References 42 publications

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“…This pattern has been interpreted as the result of the mantle outflow from below the Adria plate toward the Pannonian Basin. However, P wave tomography shows that the Dinarides slab gap is located toward the north, underneath the Istria Peninsula (Piromallo & Morelli, ; Šumanovac et al, ). While the northernmost SKS data along the Dinarides are next to the edge of the slab, so it could represent the escape flow from Adria toward the Pannonian Basin, we can interpret the SKS from the Central Dinarides as due to perturbation of the flow from the slab window.…”

Section: Discussionmentioning

confidence: 99%

“…As a base map we show a smoothed version of the regional P wave tomography model (Piromallo & Morelli, ), where velocity anomalies are averaged within the depth range of 100–400 km. Further tomography data (e.g., cross sections) are available in, for example, Piromallo and Morelli () and Šumanovac et al (). In each panels, a dashed blue line shows the proximate position of the slab window.…”

Section: The Adria Microplatementioning

confidence: 99%

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Subduction Zones Interaction Around the Adria Microplate and the Origin of the Apenninic Arc

2018

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The study of slab-slab interactions has come to the front of geodynamics researches to explain geological and geophysical observations from tectonically complex areas. Here we aim to better understand the geodynamics of the Central Mediterranean, where the Adria plate subducts on its two opposite sides. Additionally, the slab below the Central South Apennines has been progressively breaking off during the last 3 Myr. The role of a slab window in a single slab or in an outward dipping double-sided subduction system is addressed by analog models at the scale of the upper mantle, realized using glucose syrup and silicone putty, to model the interaction between the Earth's mantle and the lithosphere. Our results show that the presence of a slab window modifies the pattern of mantle circulation, as well as the trench geometry and kinematics. In particular, the opening of the slab window induces the formation of two arcs flanking the window, while the mantle flows through it and turns toward the arcs, creating a small-scale toroidal flow. The effect of a slab window is more pronounced on double subduction systems, as the outflow through the window is amplified, while internal deformation is induced in the plate by the opposite slab pull force. These experimental results suggest that the origin of the Apenninic and the Calabrian arcs is the result of the formation of a slab window, providing a new interpretation of the surface deformation and the SKS shear wave splitting pattern of the Adria microplate. Plain Language SummaryThe Adria microplate in the Central Mediterranean is an important part of the tectonic puzzle between the converging Africa and Eurasia plates. The heavy lithosphere sinks into the underlying mantle on two sides of the Adria plate, under the Apennines in the west and under the Dinarides in the east. During the most recent few millions of years, the lithosphere started to detach from the surface in the Central South Apennines while sinking into the mantle. This opened a slab window, an additional escape route for the mantle, which is squeezed by the two subducting lithospheres. We scaled down and simplified this setting in order to model and investigate the role of the dual subduction and the opening slab window in the evolution of the Central Mediterranean by means of analog models. Our results show that the two opposite subduction zones have a regional tectonics effect via the complex subduction-induced mantle circulation. Furthermore, the detaching lithosphere modifies the geometry of the subduction zone, which results in a double-arc geometry resembling the Northern Apennines and Calabria.

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Section: Discussionmentioning

confidence: 99%

Section: The Adria Microplatementioning

confidence: 99%

Subduction Zones Interaction Around the Adria Microplate and the Origin of the Apenninic Arc

2018

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“…Hence, the value of Q est (κ R ) for the OZLJ station may represent a transitional zone between the Pannonian Basin and the Internal Dinarides (e.g. Tomljenović et al, 2008). In addition, the values of Q est (κ R ) may define the transition zone from the undeformed Adriatic microplate (the BRJN station) into the deformed part of the Dinarides (the RIY and NVLJ stations; e.g.…”

Section: Geological Features and Seismic Activitymentioning

confidence: 99%

Estimation of near-surface attenuation in the tectonically complex contact area of the northwestern External Dinarides and the Adriatic foreland

Markušić

Stanko

Korbar

et al. 2019

Nat. Hazards Earth Syst. Sci.

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Seismically induced ground motion at a site is generally influenced by the seismic source, the propagation path and the local site conditions. Over the last several decades, researchers have consistently asserted that for near-site attenuation, the spectral parameter κ is subject primarily to the site conditions. In this research, we estimated the parameter κ based on the acceleration amplitude spectrum of shear waves from local earthquakes recorded by seismological stations situated in the western part of Croatia from the slope of the high-frequency part. The spatial distribution of κ values is comparable with seismological, geophysical and geological features, with the published coda-Q values for each station as well as with the isoseismal maps for selected stronger earthquakes in the study area. The complex pattern of longitudinal and transversal major late-orogenic fault zones dissecting early-orogenic thin-skinned tectonic cover in the Kvarner area and the shallow depth to the Moho (Mohorovičić discontinuity) in the Adriatic foreland (southern Istria) are probably responsible for a significant part of wave attenuation and for the anisotropy of attenuation. Regional near-surface attenuation distribution and modelled macroseismic fields point to the conclusion that attenuation properties of rocks in the northwestern External Dinarides are far from isotropic, and the most likely anisotropy sources are the preferential orientations of cracks and fractures under the local tectonic stress field, trapping of waves along major faults (waveguides), and/or attenuation within the fault zones. These results are important for gaining further insight into the attenuation of near-surface crust layers in the northwestern External Dinar-ides and the associated Adriatic foreland as well as in similar geotectonic settings.

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“…And while the general image is not disputed, there are numerous open questions on past and current processes connected with the creation of the Dinarides. For example, is there a slab gap in the Northwestern and Central Dinarides (Belinić et al, ; Bijwaard & Spakman, ; Koulakov et al, ; Piromallo & Morelli, ; Subašić et al, ; Šumanovac et al, ; Šumanovac & Dudjak, ), and if so, why? Is the subduction still active in the southern Adriatic (Bennett et al, )?…”

Section: Introductionmentioning

confidence: 99%

Crustal Thickness Beneath the Dinarides and Surrounding Areas From Receiver Functions

et al. 2020

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Knowledge about the crustal thickness is one of the key elements in the reconstruction of the regional tectonic history. The Dinaric mountain belt is one of the most enigmatic segments of the Alpine-Mediterranean collision zone, characterized by large variations in crustal thickness and not studied sufficiently. We present a new Moho depth map for the wider Dinarides region which was created using teleseismic earthquake recordings from 87 permanent and temporary seismic stations in the region. Teleseismic data were analyzed using the receiver function method to extract converted P to S waves. The resulting Moho topography fits well within a structural framework comprising a thicker crust under the Dinarides, which gradually becomes thinner toward the Pannonian and Adriatic domains. The profiles crossing the northwestern Dinarides are marked by a relatively sharp decrease in crustal thickness north of the main thrust front. This transition is followed by significant crustal thinning toward the Pannonian basin. The Mohorovičić discontinuity lies the deepest in the central and southern Dinarides, at depths of over 55 km. Here similarly to the northwestern segment we observe a jump in the crustal thickness when transitioning toward the Internal Dinarides, which hints at possible underthrusting (or subduction) of the Adria plate in this region. Moho depths in the transition zone toward the Pannonian basin and in the Pannonian basin proper vary between 25 and 35 km. In the Adriatic domain, we find crustal thickness ranging from 30 km to more than 45 km around the Central Adriatic islands.

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Shallow and deep lithosphere slabs beneath the Dinarides from teleseismic tomography as the result of the Adriatic lithosphere downwelling

Cited by 23 publications

References 42 publications

Subduction Zones Interaction Around the Adria Microplate and the Origin of the Apenninic Arc

Subduction Zones Interaction Around the Adria Microplate and the Origin of the Apenninic Arc

Estimation of near-surface attenuation in the tectonically complex contact area of the northwestern External Dinarides and the Adriatic foreland

Crustal Thickness Beneath the Dinarides and Surrounding Areas From Receiver Functions

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