Marlena Yaneva

Marlena Yaneva
Bulgarian Academy of Sciences | BAS · Strashimir Dimitrov Institute for Geology

PhD

About

59
Publications
8,609
Reads
How we measure 'reads'
A 'read' is counted each time someone views a publication summary (such as the title, abstract, and list of authors), clicks on a figure, or views or downloads the full-text. Learn more
118
Citations

Publications

Publications (59)
Article
Full-text available
Eight Bessarabian (Sarmatian) serpulid bioherms located among aragonite sediments of the Topola Formation in section Zelenka (Northeastern Bulgaria) have been studied to elucidate their macro- and microscopic characteristics. It is concluded that these bioherms were formed under identical arid climatic conditions as the associated aragonite sedimen...
Article
Full-text available
The Thracian settlement near the town of Letnitsa is situated on the left fluvial terrace of the Osam River. Hosting sediments are determined as sandy clayey silts, limy in various degrees. Deposits from the western and central parts are compared and both show similar mineralogical composition. These from the central parts contain more fine silt an...
Conference Paper
Full-text available
A conference paper reviewing published research and preliminary data on the ongoing studies of a recently discovered late Santonian - early Campanian tetrapod fossil site in Western Bulgaria.
Article
Full-text available
Upper Miocene fossiliferous sediments are submitted to grain-size and min-eralogical analyses in order to define the sedimentary context of the palaeon-tological findings, to clarify the depositional conditions, and to bring out some environmental features. All samples show typical features for alluvial river deposits and could be interpreted as de...
Article
Full-text available
The fossil record of Mesozoic tetrapods in Bulgaria is sparse and currently limited to the Maastrichtian limestones of the Kajlâka Formation. Herein we report on two bone fragments from the Upper Cretaceous, lower Santonian to/or lower Campanian, coal-bearing sedimentary succession of the Western Srednogorie, Western Bulgaria. Due to being very fra...
Article
40 potsherds and five other fired clay fragments from the prehistoric site of Nova Nadezhda in Bulgarian Thrace were analysed by archaeometric techniques. Twenty sherds and a daub fragment were analysed in thin section by optical microscopy; these thin sections, and thick sections of a further 24 sherds were also analysed by SEM-EDX. Results were u...
Article
Full-text available
Pavlishina, P., Dochev, D., Nikolov, V., Yaneva, M. and Konyovska, R. 2019. Palynostratigraphy of dinosaur bone-bearing deposits from the Upper Cretaceous of Western Bulgaria. Acta Geologica Polonica, 69 (4), 617-626. Warszawa. Palynological investigation of the Vrabchov dol locality (Western Bulgaria) which recently yielded fragmentary dinosaur bo...
Preprint
Full-text available
Brief conference report on a new Late Cretaceous tetrapod fossil site near the town of Tran (Western Srednogorie), Western Bulgaria, with notes on its dating and palaeoecology. Collected fossil material indicates presence of at least two groups of non-avian dinosaurs, crocodylomorph, and testudines.
Article
Full-text available
The northernmost derivation of the Mediterranean climatic influence and the wide distribution of carbonate rocks are factors that could explain red soils distribution in the lands of Southern Bulgaria. However, due to the mainly mountainous landscape, red soils can be found only on certain spots in Bulgaria. One of the most typical examples of red...
Article
Full-text available
Pavlishina, P., Dochev, D., Nikolov, V., Yaneva, M. and Konyovska, R. 2019. Palynostratigraphy of dinosaur bone-bearing deposits from the Upper Cretaceous of Western Bulgaria. Acta Geologica Polonica, 69 (4), 617-626. Warszawa. Palynological investigation of the Vrabchov dol locality (Western Bulgaria) which recently yielded fragmentary dinosaur bo...
Conference Paper
Full-text available
Until recently, the fossil record of terrestrial Mesozoic tetrapods in Bulgaria was scarce, restricted to fragmentary remains of non-avian dinosaurs from the Maastrichtian limestones of the Kajlâka Formation (Mateus et al., 2010; Godefroit, Motchurova-Dekova, 2010). Herein were present preliminary data on a new Late Cretaceous fossil site near the...
Poster
Full-text available
Until recently, the fossil record of terrestrial Mesozoic tetrapods in Bulgaria was scarce, restricted to fragmentary remains of non-avian dinosaurs from the Maastrichtian limestones of the Kajlâka Formation (Mateus et al., 2010; Godefroit, Motchurova-Dekova, 2010). Herein we present preliminary data on a new Late Cretaceous fossil site near the to...
Article
Full-text available
A comprehensive lithological and biostratigraphic investigation into diatoms and chrysophycean stomatocysts was conducted on two boreholes from the central zone of the Kostenets Neogene Basin. The diatom flora consists of 105 species, varieties, and forms. The results of these different analyses presented herein indicate three successive stages in...
Article
Full-text available
The archaeological site of Nova Nadezhda is located on a T1 terrace on the right bank of the Maritsa River and on the left bank of its right tributary, the Dermen Dere stream. Comparison of the grain-size and mineral composition of sediments from the site and natural deposits from the Maritsa and the Dermen Dere suggests that the stream recurrently...
Article
Full-text available
Sediments collected from terraces along alluvial rivers in Sofia basin are studied to characterize their grain-size and mineralogical composition, and to assess the origin of the transported and deposited materials. All samples studied appeared to be sand with various gravel admixtures, poorly to very poorly sorted with σ1 1.4φ−2.7φ, mean size betw...
Conference Paper
Full-text available
The sedimenthological model of Lom Lignite Basin (North Bulgaria) is represented by a set of maps, elaborated for the principal geological layers (sedimentary complexes) on the base of integrated analysis of data from boreholes, seismic profiling, seismic well logging, and vertical electrical sounding.
Research
Full-text available
Upper Silurian and Lower Devonian shelf deposits in West Bulgaria are exposed in three main Alpine tectonic units: the West Balkan Unit, the Lyubash Monocline and the Morava Unit. The West Balkan and Lyubash units consist of siliciclastic deposits: black graptolitic shales, banded pale shales and black siltstones. The Ludlow, Pridoli, Lochkovian, P...
Article
Full-text available
The present study aims to compare mineralogical composition of red soils, formed on marbles in South Bulgaria. We used mineralogical analysis of heavy and light mineral fraction in immersion under polarizing microscope and X-ray diffraction analysis of bulk sample and clay fraction. Three test polygons, located in South Bulgaria were examined: Petr...
Conference Paper
Full-text available
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...
Conference Paper
Full-text available
Abstract. Comprehensive sedimentological and paleontological investigations were performed on the sediments belonging to Baldevo and Nevrokop formations, in Gotse Delchev Basin, Southwest Bulgaria. The diatom flora consists of abundant Aulacoseira species with very interesting and unusual morphology. The phases in the lake history are presented her...
Article
Full-text available
The influence of the environment and the weathering conditions on the system parent rock soil is assessed. Three polygons in South Bulgaria, presenting the system parent rock (marbles)-red soil are studied. Chemical and mineralogical compositions of the red soils show that climate and geomorphic positions are as important for the soil-forming proce...
Article
Full-text available
The present study aims to demonstrate the potential of 2D resistivity profiling in recognizing and determining the sediment successions in areas with lack of outcrops. Neogene Gotse Delchev Basin was chosen for a test area. Application of this method is a first attempt to delineate the diatomite deposits in SW Bulgaria. Diatomites from Baldevo Form...
Article
Full-text available
Two new lithostratigraphic units -Momin brod and Rasovo Members of Brusartsi Formation are nominated. Momin brod Member comprising coal beds builds the lowermost part of Brusartsi Formation (Lorn coal basin). Late Miocene-Early Pliocene age of the sediments is proven for the first time by diatom microflora. It is covered by Rasovo Member consisting...
Conference Paper
We observed coseismic ground cracks related to the May 22 2012 Mw 5.6 Pernik earthquake along a fault line scarp at two localities. Some cracks have vertical displacement less than 5 cm. Two electrical resistivity profiles show that cracks relate to fault branches. Morphology and electrical resistivity profiles indicate repeating surface-rupturing...
Article
Full-text available
A new lithostratigraphic unit - Dropla Member, is separated in the tectonically allochthonous Middle Norian - Lower Toarcian flysch alternation of the Sinivir Formation, based on the presence of calcareous conglomerates (diamictite type) and of fallen blocks of sandstones and limestones. This horizontal subdivision represents the proximal developme...
Article
Full-text available
The present study deals with the new lectostratotype of the Middle Juras-sic Kotel Formation - black shales with fallen blocks (olistoliths). Two types of development are recognized in it: proximal - with many olistoliths, and distal - where the olistoliths are sparse. The Kotel Formation is deposited in the Mator Basin situated between the Moesian...
Article
Full-text available
The Lower Jurassic rocks in Eastern Stara Planina Mts. are of two types: shelf and basin. The shelf sediments are limestones, sedimentary allochtonous, redeposited in the basin as olistolites and/or conglomerates; the basin sediments are relatively deeper marine water (tectonically allochtonous), represented by siliciclastic ysch alternation { Sin...
Article
Full-text available
Abstract: Comprehensive lithostratigraphic and biostratigraphic investigation of diatoms, chrysophycean stomatocysts, and mollusc fauna was performed on a borehole C-14, near the village of Katina, from the peripheral zone of the Sofia Neogene Basin. The diatom flora consisted of 302 species, varieties and forms. Principal Component Analysis (PCA)...
Article
Full-text available
In the tectonically allochtonous Liassic sandstones of the Balaban Formation a new lithostratigraphic body is separated - the Debelets Member, based on the presence of calcareous conglomerates and breccia-conglomerates in it. This horizontal subdivision represents the proximal development of the Balaban Formation.
Poster
Full-text available
Neogene Maritsa Basin is located in the central part of South Bulgaria. Lacustrine and marsh sediments comprising silty and sandy clays, carbonaceous in various degree and grading into purer clays downwards, fill in the basin. They are interbedded by thick coal beds that are object of current large-scale opencast mining. The overburden (10 to 115 m...
Article
Full-text available
Modeling of the evolution of freshwater diatoms and the mechanism of their distribu- tion in the Neogene lake system in Southwestern Bulgaria is accomplished for the first time. The main purpose is the determination of the major stages in the evolution of the Mio-Pliocene diatom floras developed in the graben structures in this realm. Various data...
Article
Full-text available
Detailed sedimentological study of young sediments from footwall and hanging wall of the Chirpan fault near the village of Cherna gora provided information about prtographic composition of the deposits, including grain-size, mineralogical composition of clay minerals and light and heavy sandy fraction, their geochemical features and the depositiona...
Article
Full-text available
Comptes rendus de l’Acade'mie bulgare des Sciences, Vol 58, No8, pp.947-952 TRIASSIC-JURASSIC SILICICLASTIC ROCKS FROM LOUDA KAMCHIYA PART OF EAST STARA PLANINA MOUNTAIN M.Yaneva ABSTRACT Petrographical composition of siliciclastic rock from Sini Vir and Balaban Formations, East Stara Planina Mountain was studied. Calcareous sandstones - arkose...
Article
Full-text available
The onset of the Jurassic sedimentation in the region of Pernik (southwestern Bulgaria) is at the end of Bajocian with deposition of sandstones (Lyalintsi Mem- ber of Gradets Fm.) and continuing during the Bathonian with bioclastic limestones (Polaten Fm.). The section Staro selo is one of the most complete Jurassic sections in Southwest Bulgaria....
Article
Full-text available
The Sinivir Formation (Fm.) was introduced as official lithostratigraphic unit by Tchoumatchenco & Chernyavska (1989) for an alternation of sandstones and mudstones, lying below the Balaban and Kotel Fm. These rocks were individualized for the first time by Berndt (1934) as "Schieflysch", later described by Ganev (1961) as Senonian flysch, and by K...
Conference Paper
Full-text available
Investigations on paleoseismicity are an important part of seismic hazard assessment in the Upper Thracian Depression as one of the most seismically active areas in Bulgaria. The surface rupture of Popovitsa M 7.1 earthquake on April 18, 1928 referrers to an oblique fault from Maritsa fault zone. Further in the paper, the activated part of this fau...
Conference Paper
Full-text available
The Sinivir Formation (Fm.) was introduced as official lithostratigraphic unit by ×óìà÷åíêî & ×åðíÿâñêà (1989) for an alternation of sandstones and mudstones, lying below the Balaban and Kotel Fm. These rocks were individualized for the first time by Berndt (1934) as "Schieflysch", later described by Ãàíåâ (1961) as Senonian flysch, and by Êúí÷åâ &...
Conference Paper
Full-text available
Introduction The study of the Triassic and Jurassic rocks in Eastern Stara Planina Mts. started in the beginning of the 20th century. Kockel (1929) and Bernd (1934) already demonstrated that a large number of Triassic and Jurassic outcrops represented huge exotic blocks (later named olistolites), and this view has been entirely or partially shared...
Article
Full-text available
Two types (basin and shelf) of Triassic and Jurassic Tethyan sediments participate in the structure of eastern Stara Planina Mts. (eastern Bulgaria). A parautochthonous position is assumed for the basin type rocks. The shelf sediments are allochthonous and can be observed as olistolites included in the Lower Jurassic Sini Vir Formation and in the M...
Conference Paper
Full-text available
Gotse Delchev Neogene-Quaternary basin is developed in the SW Bulgaria in the graben of the some name. The graben is formed as a result of regional extension, typical for the back-arc zone of the Aegean island arc. It is filled in with alluvial, marshal and lacustrine sediments. Four formal lithostratigraphic units are detached in the basin - Valev...
Article
Full-text available
The Triassic and Jurassic sediments in East Stara Planina Mts. are of two types: (a) parautochtonous - relatively deep marine sediments, Tethyan type, and (b) allochtonous - shallow marine deposits, Peri-Tethyan type (included in the first as olistolites). The parautochtonous type had been sedimented in unilateral rift-basin, and the allochtonous t...
Article
Full-text available
The tumuli "Golyama Kosmatka" and "Svetitsata" located in the Valley of the Thracian Kings were subjected to geological and geomorphological study. The "Svetitsata" tumulus dates from the second half of 5 th century BC (found on Aug. 19, 2004). It is located between the small town of Shipka and the village of Krun, Kazanluk Area. A Thracian ruler w...
Article
Full-text available
Relay structures are very important for segmentation of large active faults. Hard linkage of two fault segments in relay zones can define these two geometric fault segments as one behavioral fault segment. Mesoscale geomorphic features and deformations in young deposits are used as paleoseismic indicators inside a relay ramp of two fault segments o...

Network

Cited By