Fig 6 - uploaded by Lidja Kurešević Ex Marčeta
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Steeply dipping flysch sediments (A) deposited between the two breccia bodies, showing the gradual transition into the roof flysch sediments with a smaller dip angle (B). Rigid brec-cia bodies showing relaxation-extensional fracturing (C)
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The Ropočevo breccia, a dimension stone highly prized in 20th century, has been examined by numerous prominent geologists of the time. It is revisited by researchers still intrigued by its perplexing provenance. Its position as a rigid exotic block of hard and completely metamorphosed carbonate breccia within the moderately lithified Upper Cretaceo...
Context in source publication
Context 1
... as the larger breccia bodies are gravitationally rebalancing due to erosional release, it is uncovered that the flysch layers have deposited between them, with a steeper dip than the surrounding flysch layers (Figure 6), proving that there was not only one breccia body that slid into the flysch basin. This also proves that breccia was not concordantly deposited within the flysch, as was thought by earlier authors. ...
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Citations
An extremely rare carbonate breccia in the Ropočevo area (southern outskirts of Belgrade, near Avala Mt., Central Serbia),
provides a clue on the probable mechanism of both its paleokarstification and a tectonic relationship with lithospheric-scale compressional events which have occurred along the latest Jurassic Neotethyan Vardar Ocean margin. Outcropping as a well-lithified block, “Ropočevo breccia” exposes an abundance of large angular, boulder-sized clasts composed of partially recrystallized limestone. It has been used for decorative purposes in the near past. The famous decorative stone “Ropočevo breccia”
represents an isolated olistolith-like carbonate block engulfed by the Upper Cretaceous Vardar Zone s.s. turbidites. In the
Ropočevo area, two penecontemporaneous turbidite systems are separated by the Alpine west-vergent thrust. However, the
“Ropočevo breccia” is related to neither the underlying Lower Cretaceous- nor the overlaying Upper Cretaceous turbidites.
Such a regional-geological relationship indicates a presence of a pre-Upper Cretaceous tectonic exhumation event, followed
by a rather short subaerial paleokarst episode. The suggested paleokarst episode is characterized by the absence of progressive abrasion and of visible roundness of the considerably large carbonate clasts. The regional geological constraints on the
investigated “Ropočevo breccia” show that the isolated “olistolith” is a breccia formed by the end of Berriasian, amalgamated from the clasts formed in a collapsed cave rooted within the primary carbonate sequence of the (latest Tithonian-)
Berriasian age. The proposed interpretation is in line with the “Basal unit” of the Lower Cretaceous “Paraflysch” belonging
to a well-hidden basal sequence of the East Vardar Zone of Central Serbia. Moreover, the available aeromagnetic data of
the Avala Mt./Ripanj–Ropočevo–Kosmaj Mt. sector, corroborate a deep-settled suture underneath the investigated segment
of the Vardar Ocean. The results further show that a short tectonic uplift and karstification episode occurred in connection
with the compressional interruption, affecting the lithospheric-scale contact between formerly descending and overriding
NeoTethyan slabs. Thus, the proposed short regional-scale lowermost Cretaceous uplift and karstification episode was likely
induced by the closure of the Neotethyan Vardar Ocean. This latest Jurassic-earliest Cretaceous collisional event produced
a short compressional episode, lifting up the investigated segment of the overriding East Vardar Zone.
