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THE KLISSURA GRANITE IN THE WESTERN BALKAN – QUESTIONS AND ANSWERS FROM NEW FIELD AND ISOTOPE STUDIES

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THE KLISSURA GRANITE IN THE WESTERN BALKAN

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THE KLISSURA GRANITE IN THE WESTERN BALKAN

References Carrigan, C.W., S. Mukasa, I. Haydoutov, K. Kolcheva. 2003. Ion microprobe U-Pb zircon ages of pre-Alpine rocks in the Balkan, Sredna gora and the Rhodope terranes of Bulgaria: Constraints on Neoproterozoic and Variscan tectonic evolution. Journ. – Czech geol. Soc., 48/1-2, 32...

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BULGARIAN GEOLOGICAL SOCIETY, Annual Scientific Conference “Geology 2004” 16 – 17.12.2004

THE KLISSURA GRANITE IN THE WESTERN BALKAN – QUESTIONS AND ANSWERS
FROM NEW FIELD AND ISOTOPE STUDIES
Ognyan Malinov1, Albrecht von Quadt2, Irena Peytcheva2,3, Tenyu Aladjov1, Andrej Aladjov1, Svetlana Naydenova1, Stoyan
Djambazov4
1
“Gravelita” Ltd, 11-13 Phillip Stanislavov, 1505 Sofia, Bulgaria
2
Institute of Isotope Geology and Mineral resources, ETH, 8092 Zurich, Switzerland
3
Bulgarian Academy of Sciences, Central Laboratory of Mineralogy and Crystallography, 1113 Sofia, Bulgaria
4
University of Chemical Technology and Metallurgy, Department for Silicate Technologies, Sofia, Bulgaria

In the core of the Berkovitsa anticline, E-SE of the The “Ceramica Aspida” Ltd performed this work in
Berkovitsa town a sequence of igneous rocks crop out, which connection with the exploration license for an area E-NE of
belong to the “Stara Planina Calc-Alkaline Formation the village of Burzya. The new field geological mapping
(Dimitrov, 1958). We report new field, structural and isotope- shows, that the Klissura granite covers a much larger area up
geochronological data for one body, known as the Klissura to the Srechanska bara river to the NE. The position of the
leucogranite (Klissura is the former name of the village of body is defined by a system of faults striking NE 50-55° and
Burzya) (Fig. 1). NW 320-340°, which were reactivated several times
.

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Fig. 1. Geological map of the region of the villages Burzya-Vurshets-Bokilovtsi (modified after Haydoutov et al., 1992) with the new field
data and sample localities.

The Klissura granite crosscuts the granodiorites of group. The porphyritic granodiorites of the Petrochan pluton
Petrochan pluton. We consider the porphyritic granodiorites in the vicinity of pick Kaleto have intrusive contacts with
in the area NE of Burzya as a possible variety of the rocks of the Berkovitsa group and within these parts the latter
Petrochan pluton (Fig. 1); these porphyritic granodiorites suffered a contact metamorphism with formation of
were described earlier as diatectites of the Burzya migmatitic hornfelses and cordierite-bearing schists.
complex of Berkovitsa group (Haydoutov et al., 1979, 1992). The Klissura granite is fine-, medium- and coarse-
We never have seen a direct contact of the Klissura granite grained, often pegmatite-like. White aplitic veins cross cut
with the metamorphosed phyllites and diabases of Berkovitsa the body in some places. The structure of the granite is

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Exam (elaborations)

THE KLISSURA GRANITE IN THE WESTERN BALKAN – QUESTIONS AND ANSWERS FROM NEW FIELD AND ISOTOPE STUDIES

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