{"title":"Short remarks on the “Tectonic subdivision schemes application in field work – an example of the Western Sredna Gora subzone”","authors":"I. Zagorchev","doi":"10.52215/rev.bgs.2023.84.1.87","DOIUrl":"https://doi.org/10.52215/rev.bgs.2023.84.1.87","url":null,"abstract":"The tectonic subdivision of a given territory should be based on thorough field work, as a synthesis of its principal results and of the bulk of tectonic and stratigraphic knowledge on this territory. It should serve together with litho- and chronostratigraphy as a basic framework both for future mapping and prospection, and for metallogenic, hydrogeological, geotechnical, etc. research.","PeriodicalId":40733,"journal":{"name":"Spisanie Na B Lgarskoto Geologichesko Druzhestov-Review of the Bulgarian Geological Society","volume":" ","pages":""},"PeriodicalIF":0.2,"publicationDate":"2023-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44297127","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Answer to the “Short remarks on the “Tectonic subdivision schemes application in field work – an example of the Western Sredna Gora subzone” by I. Zagorchev","authors":"D. Vangelov, I. Gerdjikov","doi":"10.52215/rev.bgs.2023.84.1.91","DOIUrl":"https://doi.org/10.52215/rev.bgs.2023.84.1.91","url":null,"abstract":"We are grateful to Academician Zagorchev for the remarks and questions, which create a suitable basis for creative discussions, missing during the last years in almost dying out “Regional and structural geology” field of research. In fact, we wanted to initiate\u0000comments, which is why the “Discussion” part of our short communication was so long. Addressing some of the criticism, we would like\u0000to remind that the topic of this short paper is to outline the handicaps of tectonic schemes application during the field work and discrepancy\u0000with the field data and the published information on the base of an example from the Western Sredna gora sub-zone. We did not intend to\u0000make complete analysis of all available data, and something more, that is not possible in the format of Geosciences editions.","PeriodicalId":40733,"journal":{"name":"Spisanie Na B Lgarskoto Geologichesko Druzhestov-Review of the Bulgarian Geological Society","volume":" ","pages":""},"PeriodicalIF":0.2,"publicationDate":"2023-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46918519","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Mineralogy of the deposit of albitized granites Kanarata, Sakar Мountain, Southеastern Bulgaria","authors":"Y. Yanev","doi":"10.52215/rev.bgs.2023.84.1.11","DOIUrl":"https://doi.org/10.52215/rev.bgs.2023.84.1.11","url":null,"abstract":"The Kanarata albitized granite deposit is located on the NE periphery of the Sakar Upper Carboniferous granite batholith, immediately adjacent to its contact with the metamorphic framework. The porphyroid two-mica granites of the batholith are replaced by albite and quartz, and by magnesium-rich minerals in small amounts (some enriched in sodium): Mg-actinolite to Mg-hornblende and Mg-tremolite, phlogopite, chlorite, talc, saponite, as well as accessory rutile, probably titanite and apatite. The only relict mineral is zircon. The newly formed minerals are products of alkaline (magnesium-sodium) metasomatosis of possibly Alpine age. This has led to a change in the chemical composition of the granite, resulting in a decrease in the amount of silicon, iron, calcium, and especially potassium, and an increase in the amount of titanium, aluminum, magnesium, and especially sodium.","PeriodicalId":40733,"journal":{"name":"Spisanie Na B Lgarskoto Geologichesko Druzhestov-Review of the Bulgarian Geological Society","volume":" ","pages":""},"PeriodicalIF":0.2,"publicationDate":"2023-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42210766","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Composition and structure of marls from the Sumer Formation as an environment for geological disposal of radioactive waste","authors":"M. Tsvetkova","doi":"10.52215/rev.bgs.2023.84.1.23","DOIUrl":"https://doi.org/10.52215/rev.bgs.2023.84.1.23","url":null,"abstract":"When selecting a site for the construction of a repository for high-level radioactive waste (HLW), the mineral composition of the geological environment is of primary importance. The content and type of the clay component and its structure have important implications for the insulating and sorption properties of the host rock and migration of radionuclides. In such previous studies in Bulgaria for site selection of the geological disposal of HLW the Lower Cretaceous marls (argillites) of the Sumer Formation (Western Pre-Balkans) were considered as ones of the prospective formations. This paper presents data about grain size distribution and mineral composition of the marls (argillites) at depths of 50 m and 400 m. A study was conducted on the structure of samples taken at a depth of 800 m from the Golyamo Pestene borehole. The obtained results are compared in order to clarify the homogeneity of the formation in depth. An increase in the clay fraction and the illite contained in it are observed in depth – from 22% at 18 m to 29% at 400 m, additionally, there is a slight increase in the carbonate content from 13.9% in samples up to 50 m to 26.9% on samples of 400 m. Data are presented on the volume, surface area, size and distribution of pores in the marls from 200 m depth (P-5 “Golyamo Peshtene”), which are necessary in assessing the migration of radionuclides from the repository. The majority of pores (82.4%) have a radius below 0,1 μm. A comparison is made of the mineral composition and structure of the argillites (marls) with similar clay rocks in Western Europe, where underground research laboratories have been constructed for in-situ study of the host rock.","PeriodicalId":40733,"journal":{"name":"Spisanie Na B Lgarskoto Geologichesko Druzhestov-Review of the Bulgarian Geological Society","volume":" ","pages":""},"PeriodicalIF":0.2,"publicationDate":"2023-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47069775","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Geochemistry of ore minerals from Chelopech deposit: II. Trace-elements in enargite-luzonite","authors":"Victoria Vangelova","doi":"10.52215/rev.bgs.2023.84.1.59","DOIUrl":"https://doi.org/10.52215/rev.bgs.2023.84.1.59","url":null,"abstract":"The concentrations of trace elements in enargite-luzonite from blocks 8, 19-SE, 19-NW, 19-NE, 19-SW, 103-W, 103-E, 144, 146, 147, 149-south, 150, and 151 of copper-gold high sulphidation Chelopech deposit were determined by LA-ICP-MS. It was found that the enargite-luzonites from the individual blocks are enriched in different degrees of “impurity” elements: those from block 19-SW are enriched in Ge, Ga, and W; from block 146 of Bi; from block 147 of Se, Sb, Sn, and In; from block 149-south of Zn, Pb, Tl, and Cd; from block 8 of Fe, Mn, and Ti; from block 103-Е of Au and Hg; from block 103-W of V, Ga, and Mo; from block 150 of Ag and from block 151 of Те. In addition, a preferential distribution of trace elements between pyrite and enargite-luzonite is observed. For example, silver, lead, manganese, nickel, cobalt, thallium, molybdenum, chromium, and titanium are concentrated in the first, while germanium, gallium, indium, tin, zinc, antimony, tellurium, bismuth, mercury, vanadium, tungsten in the second, and in most cases they are structurally related. Both minerals are concentrators of gold, but it reaches its highest values in the latter (309 ppm from block 103-Е and 118 ppm from block 151), and in both cases its presence is mainly due to microinclusions of native gold and/or electrum and tellurides.","PeriodicalId":40733,"journal":{"name":"Spisanie Na B Lgarskoto Geologichesko Druzhestov-Review of the Bulgarian Geological Society","volume":"1 1","pages":""},"PeriodicalIF":0.2,"publicationDate":"2023-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41863757","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Victoria Vangelova, Мartin Dobrev, Simeon Topchijiski, Petja Kuzmanova
{"title":"Geochemistry of ore minerals from Chelopech deposit: I. Trace elements\u0000in pyrite","authors":"Victoria Vangelova, Мartin Dobrev, Simeon Topchijiski, Petja Kuzmanova","doi":"10.52215/rev.bgs.2023.84.1.31","DOIUrl":"https://doi.org/10.52215/rev.bgs.2023.84.1.31","url":null,"abstract":"The concentrations of trace elements in pyrite from blocks 8, 19-SE, 19-NW, 19-NE, 19-SW, 103-W, 103-E, 144, 146, 147, 149-south, 150, and 151 of copper-gold high sulphidation Chelopech deposit were determined by LA-ICP-MS. It was found that the pyrites from the individual blocks are enriched in different degrees of “impurity” elements: the highest contents of Ag, Au, Zn, Hg, and In are typical to block 19-NE; Se, Bi, and Ti to block 19-SE; As, Mn, Tl, V, and Cd to block 19-SW; Co and Ni to block 144; Sb and Sn to block 146; Cu to block 149-south; Pb, Te, and Ga to block 103-E and Cr to block 103-W. The obtained results also show that in collomorhic pyrites the variations in the contents of trace elements are always very large and are rather due to adsorption processes than isomorphism. In addition, pyrites are also enriched in poisonous trace elements, especially from the lower level of the northern blocks, which, however, also have the highest values of gold and silver.","PeriodicalId":40733,"journal":{"name":"Spisanie Na B Lgarskoto Geologichesko Druzhestov-Review of the Bulgarian Geological Society","volume":" ","pages":""},"PeriodicalIF":0.2,"publicationDate":"2023-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45953022","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}