Thermal history of the central part of the Karst Dinarides, Croatia: Combined application of clay mineralogy and low-T thermochronology

Środoń, Jan; Anczkiewicz, Aneta A.; Dunkl, İstván; Vlahović, Igor; Velić, Ivo; Tomljenović, Bruno; Kawiak, Tadeusz; Banaś, Michał; Eynatten, Hilmar von

doi:10.1016/j.tecto.2018.06.016

Cited by 17 publications

(6 citation statements)

References 78 publications

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“…These new findings confirm that during the tectonic evolution of the External Dinarides, structures with NE-directed tectonic transport have been formed in some areas (as in the neighbouring Velebit Mt. area -VLAHOVIĆ et al, 2012;ŚRODOŃ et al, 2018;TOMLJENOVIĆ et al, 2018) along with the predominant SWdirected tectonic transport. Such structures were formed either concurrently with SW-vergent Dinaridic structures or their formation may present a substage within the principal Dinaridic tectonic phase.…”

Section: Structural Relationships In the Vinodol Valley And Bakar Baysupporting

confidence: 73%

“…Along the NE edge of the Vinodol Valley reverse faults are characterised by tectonic transport to the SW, while those along the SW edge of the Vinodol Valley mostly indicate the opposite direction of tectonic transport, towards the NE, which is, although quite rare in the Dinarides, very common in the structures of the neighbouring Velebit Mt. and Krk island (VLAHOVIĆ et al, 2012;ŚRODOŃ et al, 2018;TOMLJENOVIĆ et al, 2018). In addition to a completely new detailed lithostratigraphic subdivision of deposits, this is one of the key improvements in respect to the previous geological map of the area (ŠUŠNJAR et al, 1970).…”

Section: Geological Mapping Of the Vinodol Valleymentioning

confidence: 99%

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Geological and structural setting of the Vinodol Valley (NW Adriatic, Croatia): insights into its tectonic evolution based on structural investigations

Palenik¹,

Matičec²,

Fuček³

et al. 2019

Geol Cro

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The area of the Vinodol Valley and Bakar Bay represents a NW-SE oriented valley in the NW Adriatic characterised by prominent historical and instrumentally recorded seismicity. As part of the greater geodynamic domain including the Ilirska Bistrica-Rijeka-Senj seismogenic fault zone, new geological and structural data addressing the tectonic evolution of the area were collected in order to better understand the focal mechanisms of previous earthquakes and to enable identification of potential seismogenic sources. Mapped informal lithostratigraphic units mostly correspond to the Upper Cretaceous, Palaeogene and Quaternary successions described in other parts of the External Dinarides. However, a shorter stratigraphic range of the Gornji Humac fm., the youngest Cretaceous unit in the study area, was determined and suggests that the uplifted area in the central NW part of the Adriatic Carbonate Platform already comprised several thousand km 2 (from W and NW Istria to Krk and Vinodol area) at the end of the Turonian. Structural measurements of the fault planes in the study area generally correspond to the existing structural model of the tectonic evolution of the Dinarides. However, in contrast to the SW vergences typical of the Dinarides, NE-vergent reverse structures are common, especially along the SW margin of the Vinodol Valley. Cross-cutting relationships suggest that transpressional (NW-SE and NE-SW striking dextral and sinistral faults) and extensional features (NW-SE and NE-SW striking normal faults) are structurally concurrent or younger than the reverse faults, suggesting a change in the palaeostress field during the Neogene-Quaternary, with prevalent transpression and radial extension. Comparison of results of the palaeostress field analysis and the constructed synthetic focal mechanisms on one side, with available focal mechanism solutions for earthquakes within the Ilirska Bistrica-Rijeka-Senj seismogenic fault zone on the other, shows a favourable orientation of the observed NW-SE and NE-SW striking faults with respect to the recent compressional/transpressional stress field (N-S oriented P-axis), indicating these as potential seismogenic sources within the study area.

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Section: Structural Relationships In the Vinodol Valley And Bakar Baysupporting

confidence: 73%

Section: Geological Mapping Of the Vinodol Valleymentioning

confidence: 99%

Geological and structural setting of the Vinodol Valley (NW Adriatic, Croatia): insights into its tectonic evolution based on structural investigations

Palenik¹,

Matičec²,

Fuček³

et al. 2019

Geol Cro

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“…Negligible Neogene shortening in the central External Dinarides is also supported by the absence of a Miocene flexural foreland basin (Fig. 1 a) and the lack of Miocene low–temperature cooling ages in the central External Dinarides 49 (Fig. 2 ).…”

Section: Discussionmentioning

confidence: 81%

Post-collisional mantle delamination in the Dinarides implied from staircases of Oligo-Miocene uplifted marine terraces

Balling

Grützner

Tomljenović

et al. 2021

Sci Rep

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The Dinarides fold-thrust belt on the Balkan Peninsula resulted from convergence between the Adriatic and Eurasian plates since Mid-Jurassic times. Under the Dinarides, S-wave receiver functions, P-wave tomographic models, and shear-wave splitting data show anomalously thin lithosphere overlying a short down-flexed slab geometry. This geometry suggests a delamination of Adriatic lithosphere. Here, we link the evolution of this continental convergence system to hitherto unreported sets of extensively uplifted Oligocene–Miocene (28–17 Ma) marine terraces preserved at elevations of up to 600 m along the Dinaric coastal range. River incision on either side of the Mediterranean-Black Sea drainage divide is comparable to the amounts of terrace uplift. The preservation of the uplifted terraces implies that the most External Dinarides did not experience substantial deformation other than surface uplift in the Neogene. These observations and the contemporaneous emplacement of igneous rocks (33–22 Ma) in the internal Dinarides suggest that the Oligo-Miocene orogen-wide uplift was driven by post-break-off delamination of the Adriatic lithospheric mantle, this was followed by isostatic readjustment of the remaining crust. Our study details how lithospheric delamination exerts an important control on crustal deformation and that its crustal signature and geomorphic imprint can be preserved for millions of years.

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“…Negligible Neogene shortening in the central External Dinarides is also supported by the absence of a Miocene flexural foreland basin (Fig. 1a) and the lack of Miocene low-temperature cooling ages in the central External Dinarides 49 (Fig. 2).…”

Section: Discussionmentioning

confidence: 81%

Post‑collisional mantle delamination in the Dinarides implied from staircases of Oligo‑Miocene uplifted marine terraces

Balling

Grützner

Tomljenović

et al. 2021

Preprint

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The Dinarides fold and thrust belt on the Balkan Peninsula is the result of the long-lasting convergence between the Adriatic and Eurasian plates since the Mid-Jurassic. Late Jurassic obduction of ophiolites, Early Cretaceous composite nappe stacking, and subsequent continent-continent collision in the latest Cretaceous resulted in folding and thrusting that in the most external part of the Dinarides took place during the Middle Eocene &#8211; Oligocene. This extensive last phase of substantial crustal shortening and thickening was associated with flexural foreland basin deposition, resulting in Eo- to early Oligocene syntectonic units. These rocks and older Mesozoic carbonate platform units now form the mountain chain of the external Dinarides. So far, the driving mechanism behind the rock uplift was unknown and it was not clear when the present-day topography formed. Here we show that horizontal marine terraces preserved at elevations of up to 600 m in the external Dinarides are crucial to answer these questions.We extracted horizontal surfaces, river incision profiles, and the Adriatic and Black Sea catchments from a digital elevation model (DEM). The extracted horizontal surfaces are interpreted as marine terraces because they are degradational, locally preserved in a staircase morphology, neither bedding- nor fault-related, and located close to the present-day Adriatic shoreline. The marine terraces stretch c. 600 km along-strike the entire Dinaric coastal region. Their spatial correlation agrees with the position of a reported positive P-wave tomography anomaly beneath the Dinarides. This up to 180 km deep anomaly correlates also with the thinnest part of the Adriatic lithosphere and the Adriatic-Black Sea drainage divide. The orogen-perpendicular river incisions profiles reveal a symmetric river incision pattern on both sides of the drainage divide. The mean amount of the river incision is equivalent to the mean elevation of the documented marine terraces. All results point to an orogen-wide surface uplift of the Dinarides.Based on the geological record this post-collisional uplift event can be relatively dated to Oligocene-Miocene (28-17 Ma) and seems to be broadly contemporaneous with the emplacement of igneous rocks with mantle affinity (33-22 Ma) in the internal Dinarides. Previously published geophysical and petrological, as well as the new geomorphological data presented here suggest that the post-collisional reorganization of the Dinarides is attributed to an Oligocene-Miocene mantle delamination event, which results in uplift event affecting the entire Dinarides. We also show that no significant, orogen-scale deformation affected the uplifted Dinarides after the Early Miocene.

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Thermal history of the central part of the Karst Dinarides, Croatia: Combined application of clay mineralogy and low-T thermochronology

Cited by 17 publications

References 78 publications

Geological and structural setting of the Vinodol Valley (NW Adriatic, Croatia): insights into its tectonic evolution based on structural investigations

Geological and structural setting of the Vinodol Valley (NW Adriatic, Croatia): insights into its tectonic evolution based on structural investigations

Post-collisional mantle delamination in the Dinarides implied from staircases of Oligo-Miocene uplifted marine terraces

Post‑collisional mantle delamination in the Dinarides implied from staircases of Oligo‑Miocene uplifted marine terraces

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Thermal history of the central part of the Karst Dinarides, Croatia: Combined application of clay mineralogy and low-T thermochronology

Cited by 17 publications

References 78 publications

Geological and structural setting of the Vinodol Valley (NW Adriatic, Croatia): insights into its tectonic evolution based on structural investigations

Geological and structural setting of the Vinodol Valley (NW Adriatic, Croatia): insights into its tectonic evolution based on structural investigations

Post-collisional mantle delamination in the Dinarides implied from staircases of Oligo-Miocene uplifted marine terraces

Post&#8209;collisional mantle delamination in the Dinarides implied from staircases of Oligo&#8209;Miocene uplifted marine terraces

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Post‑collisional mantle delamination in the Dinarides implied from staircases of Oligo‑Miocene uplifted marine terraces