Founded 1934 by Prof. Dr Stefan Bončev
A Geo-Sciences Journal of the Geological Institute “Strashimir Dimitrov”, Bulgarian Academy of Sciences
Official Journal of the Carpathian-Balkan Geological Association

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VOLUME 51 (2)/August 2022

Doncho Karastanev
Geological Institute, Bulgarian Academy of Sciences, Acad. G. Bonchev Str., Bl. 24, 1113 Sofia, Bulgaria
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Boriana Tchakalova
Geological Institute, Bulgarian Academy of Sciences, Acad. G. Bonchev Str., Bl. 24, 1113 Sofia, Bulgaria
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Dimitar Antonov
Geological Institute, Bulgarian Academy of Sciences, Acad. G. Bonchev Str., Bl. 24, 1113 Sofia, Bulgaria

Field experiment of cement-modified loess

Zlatka Milakovska
Geological Institute, Bulgarian Academy of Sciences, Acad. G. Bonchev Str., Bl. 24, 1113 Sofia, Bulgaria
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Atanas Hikov
Geological Institute, Bulgarian Academy of Sciences, Acad. G. Bonchev Str., Bl. 24, 1113 Sofia, Bulgaria
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Valcana Stoyanova
Interoceanmetal Joint Organization, 9 Cyryla i Metodego Str., 71-541 Szczecin, Poland
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Irena Peytcheva
Geological Institute, Bulgarian Academy of Sciences, Acad. G. Bonchev Str., Bl. 24, 1113 Sofia, Bulgaria
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Valentina Lyubomirova
Faculty of Chemistry and Pharmacy, Sofia University “St Kliment Ohridski”, 1 James Bourchier Blvd, 1164 Sofia, Bulgaria
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Tomasz Abramowski
Maritime University of Szczecin, 1/2 Wały Chrobrego, 70-500 Szczecin, Poland

REY in pore waters of sediments hosting Fe-Mn nodules of the Interoceanmetal exploration area in the Clarion-Clipperton Fracture Zone, NE Pacific

Lilia Dodekova
Geological Institute, Bulgarian Academy of Sciences, Acad. G. Bonchev Str., Bl. 24, 1113 Sofia, Bulgaria
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Ivo Sapunov
Geological Institute, Bulgarian Academy of Sciences, Acad. G. Bonchev Str., Bl. 24, 1113 Sofia, Bulgaria

Dinoflagellate cyst biostratigraphy of the Bathonian, Callovian, and the Upper Jurassic in North Bulgaria

Mariana Yossifova
Geological Institute, Bulgarian Academy of Sciences, Acad. G. Bonchev Str., Bl. 24, 1113 Sofia, Bulgaria
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Dimitrina Dimitrova
Geological Institute, Bulgarian Academy of Sciences, Acad. G. Bonchev Str., Bl. 24, 1113 Sofia, Bulgaria
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Milena Vetseva
Geological Institute, Bulgarian Academy of Sciences, Acad. G. Bonchev Str., Bl. 24, 1113 Sofia, Bulgaria
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Stoyan Georgiev
Geological Institute, Bulgarian Academy of Sciences, Acad. G. Bonchev Str., Bl. 24, 1113 Sofia, Bulgaria
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Yana Tzvetanova
Institute of Mineralogy and Crystallography, Bulgarian Academy of Sciences, Acad. G. Bonchev Str., Bl. 107, 1113 Sofia, Bulgaria

Preliminary data on critical element contents in lignite from the Maritsa East basin, Bulgaria

Alexander Vlahov
Geological Institute, Bulgarian Academy of Sciences, Acad. G. Bonchev Str., Bl. 24, 1113 Sofia, Bulgaria

XRD-based crystallinity degrees and formation temperature of graphite in some regional-metamorphic rocks from the Central and Eastern Rhodopes, Bulgaria: a test of the new graphitization degree GD(0–30) scale

Georgi Milenkov
Geological Institute, Bulgarian Academy of Sciences, Acad. G. Bonchev Str., Bl. 24, 1113 Sofia, Bulgaria
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Rossitsa D. Vassileva
Geological Institute, Bulgarian Academy of Sciences, Acad. G. Bonchev Str., Bl. 24, 1113 Sofia, Bulgaria
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Sylvina Georgieva
Geological Institute, Bulgarian Academy of Sciences, Acad. G. Bonchev Str., Bl. 24, 1113 Sofia, Bulgaria
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Valentin Grozdev
Geological Institute, Bulgarian Academy of Sciences, Acad. G. Bonchev Str., Bl. 24, 1113 Sofia, Bulgaria
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Irena Peytcheva
Geological Institute, Bulgarian Academy of Sciences, Acad. G. Bonchev Str., Bl. 24, 1113 Sofia, Bulgaria

Trace-element signatures and U-Pb geochronology of magmatic and hydrothermal titanites from the Petrovitsa Pb-Zn deposit, Madan region, Central Rhodopes (Bulgaria)

Editorial Board

Editorial

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VOLUME 51 (1)/April 2022

Avtandil Okrostsvaridze
Institute of Earth Sciences, Ilia State University, 77 Ntsubidze Str., 0177 Tbilisi, Georgia
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David Bluashvili
Faculty of Mining and Geology, Georgian Technical University, Kostava Str., 0175 Tbilisi, Georgia
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Salome Gogoladze
Institute of Earth Sciences, Ilia State University, 77 Ntsubidze Str., 0177 Tbilisi, Georgia
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Rabi Gabrielashvili
Faculty of Mining and Geology, Georgian Technical University, Kostava Str., 0175 Tbilisi, Georgia

The discovery of U mineralization in the late Variscan plagiogranite vein of the Shkhara crystalline massif (Greater Caucasus, Georgia)

Boriana Tchakalova
Geological Institute Bulgarian Academy of Sciences, Acad. G. Bonchev Str., Bl. 24, 1113 Sofia, Bulgaria
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Tzvetoslav Iliev
Geological Institute Bulgarian Academy of Sciences, Acad. G. Bonchev Str., Bl. 24, 1113 Sofia, Bulgaria

Scanning electron microscopy investigation of loess soil stabilized with cement and natural zeolite

Nikolay Bonev
Department of Geology, Palaeontology and Fossil Fuels, Faculty of Geology and Geography, Sofia University “St Kliment Ohridski”, 15 Tsar Osvoboditel Blvd, 1504 Sofia, Bulgaria
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Petyo Filipov
Geological Institute of Bulgarian Academy of Sciences, Acad. G. Bonchev Str., Bl. 24, 1113 Sofia, Bulgaria
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Tanya Stoylkova
Department of Mineralogy, Petrology and Economic Geology, Faculty of Geology and Geography, Sofia University “St Kliment Ohridski”, 15 Tsar Osvoboditel Blvd, 1504 Sofia, Bulgaria

Chemical composition of late Eocene–early Oligocene corals in reef buildups from the Thrace basin, Bulgaria–Greece: Paleoenvironmental implications

Lubomir Metodiev
Geological Institute, Bulgarian Academy of Sciences, Acad. G. Bonchev Str., Bl. 24, 1113 Sofia, Bulgaria
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Elena Koleva-Rekalova
Geological Institute, Bulgarian Academy of Sciences, Acad. G. Bonchev Str., Bl. 24, 1113 Sofia, Bulgaria
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Silviya Petrova
Geological Institute, Bulgarian Academy of Sciences, Acad. G. Bonchev Str., Bl. 24, 1113 Sofia, Bulgaria
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Docho Dochev
Department of Geology, Palaeontology and Fossil Fuels, Faculty of Geology and Geography, Sofia University “St Kliment Ohridski”, 15 Tsar Osvoboditel Blvd, 1504 Sofia, Bulgaria
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Louiza Dimowa
Institute of Mineralogy and Crystallography, Bulgarian Academy of Sciences, Acad. G. Bonchev Str., Bl. 107, 1113 Sofia, Bulgaria

New data on the stratigraphy of the Middle Jurassic siliciclastic rocks from the West Balkan Mountains (West Bulgaria)

Madlena Tsvetkova
Geological Institute, Bulgarian Academy of Sciences, Acad. G. Bonchev Str., Bl. 24, 1113 Sofia, Bulgaria

Comparison between the geological settings of the Varbitsa (NW Bulgaria) and Bure (SE France) sites for geological disposal of radioactive waste

Editorial Board

22nd Congress of the Carpathian-Balkan Geological Association (CBGA2022), 7–11 September 2022, Plovdiv (Bulgaria)

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VOLUME 50 (3)/December 2021

Vladimir Hristov
Geological Institute, Bulgarian Academy of Sciences, Acad. G. Bonchev Str., Bl. 24, 1113 Sofia, Bulgaria
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Nikolay Stoyanov
University of Mining and Geology “St Ivan Rilski”, 1700 Sofia, Bulgaria
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Simeon Valchev
Geological Institute, Bulgarian Academy of Sciences, Acad. G. Bonchev Str., Bl. 24, 1113 Sofia, Bulgaria
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Aleksey Benderev
Geological Institute, Bulgarian Academy of Sciences, Acad. G. Bonchev Str., Bl. 24, 1113 Sofia, Bulgaria

The thermal waters in Sofia City (Bulgaria): importance, condition and problems

Svetoslav Petrussenko
National Museum of Natural History, Bulgarian Academy of Sciences, 1 Tsar Osvoboditel Blvd, 1000 Sofia, Bulgaria
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Chavdar Karov
National Museum of Natural History, Bulgarian Academy of Sciences, 1 Tsar Osvoboditel Blvd, 1000 Sofia, Bulgaria

The mineral diversity of the Urdini Lakes and the glacial valley of the Urdina River (Rila Mountain) – an overview

Boriana Tchakalova
Geological Institute, Bulgarian Academy of Sciences, Acad. G. Bonchev Str., Bl. 24, 1113 Sofia, Bulgaria
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Boyko Berov
Geological Institute, Bulgarian Academy of Sciences, Acad. G. Bonchev Str., Bl. 24, 1113 Sofia, Bulgaria

Correlation between the liquid limit of clay derived by the Vasiliev and Casagrande test methods

Antoaneta Frantzova
Geological Institute, Bulgarian Academy of Sciences, Acad. G. Bonchev Str., Bl. 24, 1113 Sofia, Bulgaria

Risk assessment of geological disaster in the region of Primorsko Municipality

Trajče Stafilov
Institute of Chemistry, Faculty of Natural Sciences and Mathematics, Sts Cyril and Methodius University, 5 Arhimedova, 1000 Skopje, North Macedonia
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Robert Šajn
Geological Survey of Slovenia, 14 Dimičeva, 1000 Ljubljana, Slovenia
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Danica Damčevska
Institute of Chemistry, Faculty of Natural Sciences and Mathematics, Sts Cyril and Methodius University, 5 Arhimedova, 1000 Skopje, North Macedonia
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Claudiu Tănăselia
INCDO-INOE 2000 Research Institute for Analytical Instrumentation (ICIA), Cluj-Napoca, Romania

Use of multivariate statistical methods to determine spatial distributions of chemical elements in soils (Mariovo region, North Macedonia)

Miroslav Krastanov
Geological Institute, Bulgarian Academy of Sciences, Acad. G. Bonchev Str., Bl. 24, 1113 Sofia, Bulgaria
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Boyko Berov
Geological Institute, Bulgarian Academy of Sciences, Acad. G. Bonchev Str., Bl. 24, 1113 Sofia, Bulgaria

Assessment of the factors affecting slope stability in the southern part of the Sofia Kettle

Nikolay B. Piperov
Institute of General and Inorganic Chemistry, Department of Analytical Chemistry, Bulgarian Academy of Sciences, Acad. G. Bontchev Str., Bl. 11, 1113 Sofia, Bulgaria
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Sylvina Georgieva
Geological Institute, Bulgarian Academy of Sciences, Acad. G. Bonchev Str., Bl. 24, 1113 Sofia, Bulgaria

Stable isotope (δD, δ18O) data on the structural water of two sericite samples from the Cu-Au high-sulphidation deposit Chelopech, Bulgaria – a tentative study

Lubomir Metodiev
Geological Institute, Bulgarian Academy of Sciences, Acad. G. Bonchev Str., Bl. 24, 1113 Sofia, Bulgaria

In memoriam: Professor Alexandra Vladimirova Harkovska, DSc (January 15, 1935 – October 4, 2021)

DETAILS

VOLUME 50 (2)/August 2021

Docho Dochev
Department of Geology, Palaeontology and Fossil Fuels, Faculty of Geology and Geography, Sofia University “St Kliment Ohridski”, 15 Tsar Osvoboditel Blvd, 1504 Sofia, Bulgaria
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Lubomir Metodiev
Geological Institute, Bulgarian Academy of Sciences, Acad. G. Bonchev Str., Bl. 24, 1113 Sofia, Bulgaria

Review of the ammonite genus Pseudokossmaticeras Spath, 1922 from the uppermost Campanian–lower Maastrichtian in Bulgaria

Tanya Vasileva
Geological Institute, Bulgarian Academy of Sciences, Acad. G. Bonchev Str., Bl. 24, 1113 Sofia, Bulgaria
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Dimitar Sholev
Laboratory of Telematics, Bulgarian Academy of Sciences, Acad. G. Bonchev Str., Bl. 8, 1113 Sofia, Bulgaria

Groundwater chemistry: a case study of the Mesta River Basin

Bistra Kunovska
National Center for Radiobiology and Radiation Protection, 3 St Georgi Sofiyski Str., 1606 Sofia, Bulgaria
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Mila Trayanova
Geological Institute, Bulgarian Academy of Sciences, Acad. G. Bonchev Str., Bl. 24, 1113 Sofia, Bulgaria
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Monika Mutovska
National Center for Radiobiology and Radiation Protection, 3 St Georgi Sofiyski Str., 1606 Sofia, Bulgaria
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Simeon Valchev
Geological Institute, Bulgarian Academy of Sciences, Acad. G. Bonchev Str., Bl. 24, 1113 Sofia, Bulgaria
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Boyka Mihaylova
Geological Institute, Bulgarian Academy of Sciences, Acad. G. Bonchev Str., Bl. 24, 1113 Sofia, Bulgaria

Review of investigations into the vadose zone’s variable state of saturation in connection with the assessment of radon potential in Bulgaria

Aleksey Benderev
Geological Institute, Bulgarian Academy of Sciences, Acad. G. Bonchev Str., Bl. 24, 1113 Sofia, Bulgaria
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Asen Mitev
Geophysics Engineering EOOD, Residential area Strogoziya, Bl. 113, 5800 Pleven, Bulgaria
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Grigor Hlebarov
Ellatzite-Med AD, 2086 Mirkovo, Bulgaria
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Simeon Valtchev
Geological Institute, Bulgarian Academy of Sciences, Acad. G. Bonchev Str., Bl. 24, 1113 Sofia, Bulgaria
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Ivan Vasilev
Ellatzite-Med AD, 2086 Mirkovo, Bulgaria
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Alexandar Grigorov
Ellatzite-Med AD, 2086 Mirkovo, Bulgaria

4D investigation of water infiltration in waste dumps using electrical resistivity (Elatsite mine, Bulgaria)

Lubomir Metodiev
Geological Institute, Bulgarian Academy of Sciences, Acad. G. Bonchev Str., Bl. 24, 1113 Sofia, Bulgaria
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Docho Dochev
Department of Geology, Palaeontology and Fossil Fuels, Faculty of Geology and Geography, Sofia University “St Kliment Ohridski”, 15 Tsar Osvoboditel Blvd, 1504 Sofia, Bulgaria
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Svetlozar Seferinov
Department of Geology, Palaeontology and Fossil Fuels, Faculty of Geology and Geography, Sofia University “St Kliment Ohridski”, 15 Tsar Osvoboditel Blvd, 1504 Sofia, Bulgaria
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Silviya Petrova
Geological Institute, Bulgarian Academy of Sciences, Acad. G. Bonchev Str., Bl. 24, 1113 Sofia, Bulgaria

First record of an erymid lobster (Crustacea, Decapoda) from the upper Bajocian of Northwest Bulgaria

Lubomir Metodiev
Geological Institute, Bulgarian Academy of Sciences, Acad. G. Bonchev Str., Bl. 24, 1113 Sofia, Bulgaria

In memoriam: Associate Professor Dimitar Angelov Tronkov (September 29, 1933 – November 30, 2020)

DETAILS

VOLUME 50 (1)/April 2021

Lidiya Kirilova
Regional Museum of History Kardzhali, 4 Republikanska Str., 6600 Kardzhali, Bulgaria
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Ivan Ivanov
GORUBSO Kardzhali AD, 83 Republikanska Str., 6600 Kardzhali, Bulgaria

Fossil gastropods Campanile lachesis Bayan, 1870 from the upper Eocene of the Eastern Rhodopes (Bulgaria)

Alexander Vlahov
Geological Institute, Bulgarian Academy of Sciences, Acad. G. Bonchev Str., Bl. 24, 1113 Sofia, Bulgaria

XRD graphitization degrees: a review of the published data and new calculations, correlations, and applications

Doncho Karastanev
Geological Institute, Bulgarian Academy of Sciences, Acad. G. Bonchev Str., Bl. 24, 1113 Sofia, Bulgaria
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Boriana Tchakalova
Geological Institute, Bulgarian Academy of Sciences, Acad. G. Bonchev Str., Bl. 24, 1113 Sofia, Bulgaria

Liquefaction potential assessment of saturated loess

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