Hristo Borisov Kiselinov

• PhD
• Professor (Assistant) at Bulgarian Academy of Sciences, Geological Institute

The Sredogriv greenschist facies rocks belong to the Western Balkan Zone in northwestern Bulgaria. The low-grade rocks consist of clastic-tuffaceous precursors and presumably olistostromic magmatic bodies. We present U-Pb LA-ICP-MS zircon age constraints for the Sredogriv metaconglomerate, intruding metaalbitophyre and a breccia-conglomerate of the...

Indoor radon exposure is recognized as a significant cause of lung cancer, as shown by various epidemiological studies. One possible pathway for radon transport is through faults, where radon can escape into fractures and open spaces in rocks. Numerous studies link fault systems to elevated radon levels at the surface or within buildings. In Bulgar...

This study is focused on the sedimentary strata of the Silurian/Devonian boundary interval in the Gorna Vrabcha section 2 from the Morava Unit (SW Bulgaria). Four microfacies types have been distinguished and described: Bioclastic wackestone/packstone (MFT 1), Bioclastic packstone with clayey mudstone laminae (MFT 2), Bioclastic mudstone (MFT 3) an...

The Sredogriv metamorphics are located in NW Bulgaria and referred to the Balkan Terrane. They represent an alternation of different parametamorphites and, to a lesser extent, polymict metaclastic rocks, phyllites and calcareous schists. Various in size allochthonous bodies from metamorphosed magmatites have been tectonically included among them. R...

The 2012 M5.6 Pernik earthquake in Bulgaria proceeded at slow slip rates and was accompanied with ground failure along the Meshtitsa fault scarp. Our investigation through paleoseismological trenching techniques and electrical resistivity tomography discovered a broad zone with multiple fault cores. In a trench, a 40-m-thick montmorillonite clay st...

Two sandstone samples from the upper and lower part of the Ordovician succession of Svoge Unit were analyzed in order to determine their detrital zircon U–Pb age spectra using laser ablation inductively coupled plasma mass spectrometry (LA-ICP-MS). One sample was collected from the Hirnantian siliciclastic glaciomarine deposits of the Sirman Format...

Two sandstone samples from the upper and lower parts of the Ordovician succession of the Svoge Unit were analyzed in order to determine their detrital zircon U-Pb age spectra using laser ablation inductively coupled plasma mass spectrometry (LA-ICP-MS). Multi-dimensional scaling statistical technique allowed a reliable objective identification of t...

The Campanian–Paleocene carbonate sequence from the Sherbenski dol section (Eastern Fore-Balkan Mts, NE Bulgaria) is referred to three lithostratigraphic units: Mezdra Fm. (Campanian–Maastrichtian), Kaylaka Fm. (Maastrichtian– lower Paleocene) and Komarevo Fm. (lower–middle Paleocene). Six microfacies types have been described in these units and gr...

A detailed sedimentological study was carried out on the Paleocene carbonate succession from Chudnite Skali section (Eastern Fore-Balkan, Bulgaria) in order to reconstruct carbonate paleoenvironments and evolution during the Early-Late Paleocene time interval. Eleven microfacies types (MFT 1-11) were distinguished and interpreted in Mezdra (Danian)...

The Santonian–Paleocene carbonate sediments exposed in Yankovo section (Eastern Fore-Balkan, NE Bulgaria) are subdivided into six formations: MurnaMiddle Paleocene). Seven microfacies types (MFT 1–7) were distinguished and described in these rocks: very fine-grained bioclastic wackestone/packstone (MFT 1), bioclastic wackestone/float-stone (MFT 2),...

The Santonian–Paleocene carbonate sediments exposed in Yankovo section (Eastern Fore-Balkan, NE Bulgaria) are subdivided into six formations: MurnaMiddle Paleocene). Seven microfacies types (MFT 1–7) were distinguished and described in these rocks: very fine-grained bioclastic wackestone/packstone (MFT 1), bioclastic wackestone/float-stone (MFT 2),...

Abstract. The aim of this study is to estimate the finite strain in different lithological domains from the section of the Early Paleozoic green schist-facies Sredogriv metamorphites. The strain analysis was performed by several methods (Fry-method, centre to centre-method, Panozzo-method and Rf/Phi-method). The obtained results define the investi-...

Abstract. The aim of this study is to estimate the finite strain in different lithological domains from the section of the Early Paleozoic green schist-facies Sredogriv metamorphites. The strain analysis was performed by several methods (Fry-method, centre to centre-method, Panozzo-method and Rf/Phi-method). The obtained results define the investi-...

The earthquake of M W 5.6 on 22 May 2012 in SW Bulgaria is a shallow normal-faulting earthquake. Coseismic ground cracks along a fault-line scarp, focal mechanisms and hypocentre allocations suppose that the seismogenic source is a normal fault segment from the NW boundary fault of Pernik basin, named Meshtitsa fault, which has not been considered...

Natural gases emission are a very sensitive indicative for geological, especially for geotectonic state. As it was expected in distributing of gas associations the properties of the geological structure of Georgia has been obviously revealed. In order to study the gas distribution (CO2, Rn, He, CH 4 etc.) and define its quantitative characteristics...

The Upper Cretaceous (Campanian–Maastrichtian) and Paleocene carbonate and siliciclastic-carbonate successions from Boykin dol section (Eastern Fore-Balkan, Bulgaria) are represented by Dobrina, Kaylaka and Komarevo Formations. They are interpreted as deposited in diverse shallow-and open-marine carbonate settings with predominant high-energetic hy...

Introduction The Late Alpine syn-to post collisional extension and attendant tectonic denudation in the inner parts of the Alpine Orogen on the Balkan Peninsula is a well-doc-umented fact. In contrast to the Central and Eastern Rhodopes, where the exhumation of the lowermost high grade units occurred in the Paleogene, the west-ern parts of the Rhod...

The Protopopintsi metagranite is an exotic body in the succession of the Early Paleozoic greenschist-facies Sredogriv metamorphites. The in-situ LA - ICP - MS U-Pb zircon dating of the metagranite defines a Late Neoproterozoic intrusion age of 618 +/- 10 Ma and confirms the idea about its allochtonic character.