Abstract
The Istra Pushed Area is a specifically deformed territory of the northwestern part of the External Dinarides. It formed due to the movement of the Istra block as part of the Adriatic Microplate (Adria) towards the Dinarides since the middle Miocene. The movement of the Istra block caused hereditary shifts along the old dislocations dating back to the early formation stage of the formation of the Dinarides at the end of the Eocene and their deformation. These deformations are reflected also in certain extreme gravitational phenomena along the boundary between the External Dinaric Imbricated Belt and the External Dinaric Thrust Belt, where Mesozoic carbonates are thrusted upon the Cenozoic flysch. The boundary zone between these two belts connects the Trnovo, Hrušica and Snežnik Thrust Fronts. Four specific gravitational phenomena that occurred in this boundary zone are presented here, as they are remarkable in terms of their size: Črna griža (Trnovo Nappe), Suhi vrh (Hrušica Nappe), Petelinje mlake and Ilirska Bistrica (both from the Snežnik Nappe). The phenomena at Suhi vrh is described in detail herein.
Highlights
A formal boundary between the Adriatic Microplate (Adria) and the Dinarides in the NW Dinarides after Schmidt et al (2008) runs along the External Dinarides thrust boundary in the Istra and Gulf of Trieste hinterland (Fig. 1)
As the Adria rotates in a counterclockwise direction obliquely to the Dinarides (Weber et al, 2006) the movements against the Dinarides are released along two components: orthogonally
Formalna meja med Jadransko mikroploščo (Adria) in Dinaridi poteka po Schmid-u in sodelavcih (2008) po narivni meji Zunanjih Dinaridov, ki se v severozahodnih Dinaridih nahaja v zaledju Istre in Tržaškega zaliva
Summary
A formal boundary between the Adriatic Microplate (Adria) and the Dinarides in the NW Dinarides after Schmidt et al (2008) runs along the External Dinarides thrust boundary in the Istra and Gulf of Trieste hinterland (Fig. 1). The Trnovo Nappe thrust plane lies at approximately 650 m a.s.l. in the Mala Gora fossil rotational landslide in the Črni školj area (Fig. 2). An inferred course of the Hrušica Nappe thrust plane in an extension of the Ubeljska stena is presented as a dotted line in Figure 7 and illustrates the apex of the convex bulge beneath Suhi vrh (1313 m a.s.l.), the highest geographic point in the area (of Mt. Nanos). Poleg bloka G izstopa tudi blok E, kjer izgleda, da je prišlo najprej do diferencialnih premikov po sistemu razpok po katerih je nastal razdol e, Razdols d and e and a trench (valley) g beneath the head scarp are remnants of the gravitational structures, much like those behind the Rjava and Votla stena. Targeted research could provide the answer as to whether one or more fossil gravitational phenomena occurred in the Rebrnice slope
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