Polina V. Andreeva

Verified

Polina verified their affiliation via an institutional email.

Learn more

Verified

Polina verified their affiliation via an institutional email.

Learn more

• PhD
• Professor (Associate) at Bulgarian Academy of Sciences

This paper focuses on newly identified raw material outcrops in central north Bulgaria, in an area only partially surveyed in our previous fieldwork. A new series of 10 raw material and 15 archaeological samples were collected and subjected to an analytical procedure combining macro-and micropetrography with geochemical analysis using LA-ICP-MS. Co...

The Devonian sediments from the Moesian Terrane (Moesian Platform, northern Bulgaria) are known only from oil and gas prospecting wells. Middle and Upper Devonian deposits are interpreted as formed in great variety of depositional settings. Thus, the Eifelian carbonates were regarded as inner-and mid-ramp deposits developed in a shallowing-upward s...

The falsiovalis, rhenana, triangularis, marginifera and praesulcata conodont zones have been recognized within the Upper Devonian (Frasnian–Famennian) carbonate succession in the Preslavtsi-2 well from the Moesian Terrane in NE Bulgaria. Five microfacies types (MFT 1–5) are also distinguished and described within the Frasnian carbonate deposits: fe...

The upper Tithonian and the lower Berriasian in the Western Fore-Balkan in Bulgaria (Gintsi and Glozhene Formations) represent a remarkable, stratigraphically expanded record of pelagic nodular and micritic limestones. More than 50 studied thin sections revealed the succession of the Chitinoidella, Praetintinnopsella, Crassicollaria, and Calpionell...

Five conodont zones (falsiovalis, rhenana, triangularis, marginifera, and praesulcata) were recognized within the Upper Devonian carbonate sequence in the Preslavtsi 2 well from the Moesian Terrane in NE Bulgaria. Microfacies study indicates a climate change (from the Subtropical Arid to the Warm Temperate Climatic Zones) recorded in the Frasnian-F...

Palaeozoic (Silurian and Devonian) bedded cherts from the Balkan Terrane in western Bulgaria occur in three tectonic units: Svoge, Lyubash-Golo Bardo, and Morava. The Silurian and Devonian ages of the chert-bearing lithostratigraphic successions have been determined by conodonts and graptolite macrofauna. The silica source and depositional settings...

Lithic raw material provenance studies are important for reconstructing patterns of raw material procurement and exchange in prehistory. However, understanding this process requires the accurate characterisation of archaeological artefacts. This paper is based on a large amount of analytical data from our previous research and publications, augment...

Paleozoic (Silurian and Devonian) cherts from Western Bulgaria occur in three tectonic units: Svoge, Lyubash-Golo Bardo and Morava. The SiO2 content in these rocks varies from 76.06% to 96.02%. The silica source and depositional settings of the cherts have been interpreted based on the received geochemical major element data. The calculated Si/(Si+...

Natural radon (222Rn) is a radioactive noble gas that occurs in every rock or soil due to the content of radium (226Ra), part of the 238U family, in the lithosphere. One of the indicators for evaluating the impact of radon on a certain area/terrain, including on the biota, is the so-called geogenic radon potential. Different types of rocks and soil...

The development of a methodology for the geogenic radon potential (GRP) mapping based on soil gas radon and soil gas permeability field measurements is among the main objectives in the determination of “radon priority areas” in Bulgaria. One of the key elements of the methodology is to define as accurately as possible, areas of risk for the presenc...

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...

The paper presents newly obtained field and laboratory data for flint raw materials and artefacts from northwestern Bulgaria. The field survey and associated analytical work were carried out in 2020 with the following purposes: i) identifying flint raw material outcrops in the region; ii) collecting suitable raw material samples from discovered out...

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...

Geochemical studies of different Paleozoic intervals composed of bedded cherts, revealed in the western parts of the Srednogorie and Morava-Rhodope zones are presented: Saltar Fm; the lower and middle part of Katina Fm; the lowest part of Parchar Fm, and Tumba Fm. To determine whether the different bedded cherts intervals are hydrothermally affecte...

The Bulgarian prehistoric sequence is characterized by the use of particular raw materials in distinct ‘cultural’ contexts. The Karanovo I and II stages of the Early Neolithic (part of a supra-regional technocomplex in the Balkans) are recognisable by formal toolkits made of Balkan flint. The Chalcolithic period is famous for its superblades made o...

The Late Devonian (372–359 million AD) is a time of prolonged climate instability with catastrophic disturbances to global marine ecosystems at the Frasnian–Famennian (F/F) and Devonian–Carboniferous (D/C) boundaries. Global atmospheric CO2 content and climate change in the middle Paleozoic, especially in the Late Devonian, coincide with major even...

Radon (222Rn) is a natural gas produced by the radioactive decay of uranium-bearing rocks and soils in the Earth’s crust. Geology is one of the main factors controlling source and distribution of radon. Most rocks and soils possess small amount of uranium, but there are particular types of bedrocks and unconsolidated deposits characterized by highe...

Heat treatment of flint and other knappable materials has been recognized among prehistoric archaeological lithics, leading to a wide range of experiments and archaeometric analyses. The aim of these analyses was to shed light on the mechanical and chemical changes that occur in lithics (flints) subjected to heat treatment, some of which remain poo...

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...

The most representative subsurface section of the Famennian carbonate succession from the Moesian Platform in Bulgaria occurs in the R-2 Preslavtsi well. Nine microfacies types (MFTs 1-9) have been distinguished and described in the intraclastic and peloidal limestone unit and the organogenic limestone unit. They are grouped in four microfacies ass...

Different types of carbonate porosity are distinguished and described in the Devonian sediments from deep wells in north-eastern parts of the Moesian Platform. They are subdivided in two main groups: fabric selective (interparticle, intraparticle, intercrystal, moldic, fenestral, shelter and growth-framework) and not fabric selective (fracture and...

The Eifelian shale-limestone sequence (clayey-calcareous package of carbo-nate-sulphate unit) from Totleben-2 well (Moesian Platform, central North Bulgaria) comprises six microfacies types (MFT 1-6): MFT 1, brachiopod grainstone/rudstone; MFT 2, crinoid grainstone/rudstone; MFT 3, bryozoan rudstone; MFT 4, sandy bioclastic packstone/rudstone; MFT...

Palaeozoic deposits in the Moesian platform (northern Bulgaria) are known only from deep wells drilled for oil and gas prospecting. Sixteen microfacies (MFT 1–16) have been distinguished and described in the Givetian to Frasnian carbonate and evaporite sequences, represented in thirteen wells from the eastern parts of the platform. They are respect...

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)...

In the eastern part of the Western Srednogorie Unit, around Dragovishtitsa Village, a specific succession of the Gintsi and Glozhene-Slivnitsa formations has provided micropalaeontological evidence for late Tithonian (Chitinoidella, Praetintinnopsella and the base of Crassicollaria zones) and mid-Berriasian (the Elliptica Subzone of the Calpionella...

In the eastern part of the Western Srednogorie Unit, a specific succession of Gintsi and Glozhene–Slivnitsa formations has provided micropalaeontologi-cal evidence of late Tithonian (Chitinoidella and Praetintinnopsella zones) and mid-Berriasian (Elliptica Subzone of the Calpionella Zone) age on the basis of 38 chitinoidellid and calpionellid speci...

Seven carbonate microfacies types (MFT 1–7) have been distinguished and described in the Givetian dolomite formation from the Totleben-2 well (Moesian Platform, central North Bulgaria). They have been grouped in three microfacies associations: 1) shallow subtidal microfacies with open circulation (MFT 1, coral-stromatoporoid floatstone/rudstone; an...

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),...

The paper presents results of a research programme focused on the provenancing of flint raw materials used in the prehistory of the Lower Danube Basin of the Balkans. Field survey encompassed two adjacent regions connected by the Danube River. First, northern Bulgaria where rich flint-bearing Cretaceous deposits are known along with numerous Neolit...

.The Middle Devonian (Givetian) anhydrites from deep wells in the Moesian Platform (Northeastern Bulgaria) are commonly distinguished into nodular and contorted structures. The latter includes a great variety of non-bedded (nodular, nodular-mosaic, mosaic and mosaic to massive), bedded (bedded nodular, bedded nodular-mosaic and bedded mosaic to mas...

The late Pliensbachian–Toarcian (Jurassic) sedimentological, palaeontological and geochemical (belemnite 87Sr/86Sr, δ13C and δ18O) record is examined in two Eastern Tethyan (Bulgarian) locations. This interval contains the well-known early Toarcian ocean anoxic event (T-OAE) and its manifestation and temporal context is examined in Bulgaria. Many o...

The late Pliensbachian–Toarcian (Jurassic) sedimentological, paleontological and geochemical (belemnite 87Sr/86Sr, δ13C and δ18O) record is examined in two Eastern Tethyan (Bulgarian) locations. This interval contains the well-known early Toarcian ocean anoxic event (T-OAE) and its manifestation and temporal context is examined in Bulgaria. Many of...

In the present study two analytical methods are applied to characterize chert artefacts and raw materials from northeastern Bulgaria (Ludogorie region): petrographic observation and laser ablation inductively coupled plasma mass spectrometry). Archaeological samples from 12 Chalcolithic sites from Bulgaria are analyzed as well as raw material from...

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...

The Upper Pliensbachian-Toarcian (Jurassic) sedimentological, palaeontological and geochemical (belemnite 87Sr/86Sr, δ13C and δ18O) record is examined in two Eastern Tethyan (Bulgarian) locations. This interval contains the well-known Early Toarcian ocean anoxic event (T-OAE) and its manifestation and temporal context is examined in Bulgaria. Many...

The studied Middle Devonian (Givetian) dolomites occur in three well sections: OP-2 Mihalich, R-119 Kardam and R-1 Vaklino (Northeastern Bulgaria). Two general genetic dolomite groups are dis-tinguished and interpreted on the basis of performed XRD analyses and petrographic observations. The first one is represented by early diagenetic crypto-to mi...

The accomplished detailed petrographical and geochemical study reveals that the oolitic ironstones were deposited as thin units in a shallow-water carbonate-dominated marine environment with normal salinity. The ironstone formation during the Eifelian age was related with a transgression after some break in deposition and subsequent erosion of Lowe...

Ten microfacies types (MFT 1–10) are distinguished and described in the Eifelian clayey-carbonate package (carbonate-sulphate formation) from the deep wells R-1 Vaklino, R-119 Kardam and OP-2 Mihalich (NE Bulgaria). They are respectively interpreted as inner-and mid-ramp carbonates developed in a shallowing-upward sequence. Thus, a gradual transiti...

Microbial carbonates (limestones and dolostones) are established in the Middle Devonian carbonate-sulphate suite in well R-119 Kardam (North-eastern Bulgaria). They are determined as stromatolites on the basis of the observed macrofabric (horizontal or crinkled laminae) and microfabric features (fine-grained and agglutinated laminae characterized b...