Pub Date : 2023-12-01DOI: 10.52215/rev.bgs.2023.84.3.47
Rositsa Nikolova, Vladyslav Kostov-Kytin, P. Petrov, Liliya Tsvetanova, Nikolay Gospodinov, Kristina Metodieva
A suite of sulphates from a locality in Lozen ore field in the Eastern Rhodopes has been characterized by chemical analyses and X-ray diffraction. Three mineral species have been identified: epsomite (MgSO4), pickeringite (MgAl2(SO4)4•22H2O) and alunogen (Al2(SO4)3•17H2O). An attempt was made to characterize the phase transformations that occur upon wetting of the studied samples. The results show that at high humidity, pickeringite dissolves, providing constituents for subsequent crystallization of epsomite and alunogen. Further on, upon drying alunogen loses some of its crystallization water and recrystallizes again to pickeringite including magnesium species from the surrounding medium. This study draws light on certain genetic aspects related to the mechanisms and sequence of deposition of sulphate mineralization under similar conditions.
通过化学分析和 X 射线衍射，对东罗多彼山脉 Lozen 矿区的一组硫酸盐进行了鉴定。已确定的矿物种类有三种：硫酸镁（epsomite，MgSO4）、泡沸石（MgAl2(SO4)4-22H2O）和矾土（Al2(SO4)3-17H2O）。研究人员试图描述所研究样品在润湿时发生的相变。结果表明，在湿度较高的情况下，泡沸石会溶解，为随后的沸石和矾土的结晶提供成分。此外，褐藻原在干燥时会失去部分结晶水，再次结晶为泡沸石，包括周围介质中的镁元素。这项研究揭示了在类似条件下与硫酸盐矿化沉积机制和顺序有关的某些遗传学问题。
{"title":"Sulphate mineralization from one locality in Lozen ore field, Eastern Rhodopes","authors":"Rositsa Nikolova, Vladyslav Kostov-Kytin, P. Petrov, Liliya Tsvetanova, Nikolay Gospodinov, Kristina Metodieva","doi":"10.52215/rev.bgs.2023.84.3.47","DOIUrl":"https://doi.org/10.52215/rev.bgs.2023.84.3.47","url":null,"abstract":"A suite of sulphates from a locality in Lozen ore field in the Eastern Rhodopes has been characterized by chemical analyses and X-ray diffraction. Three mineral species have been identified: epsomite (MgSO4), pickeringite (MgAl2(SO4)4•22H2O) and alunogen (Al2(SO4)3•17H2O). An attempt was made to characterize the phase transformations that occur upon wetting of the studied samples. The results show that at high humidity, pickeringite dissolves, providing constituents for subsequent crystallization of epsomite and alunogen. Further on, upon drying alunogen loses some of its crystallization water and recrystallizes again to pickeringite including magnesium species from the surrounding medium. This study draws light on certain genetic aspects related to the mechanisms and sequence of deposition of sulphate mineralization under similar conditions.","PeriodicalId":509487,"journal":{"name":"Review of the Bulgarian Geological Society","volume":"62 3","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139190909","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}
Pub Date : 2023-12-01DOI: 10.52215/rev.bgs.2023.84.3.197
Stefan Velev, D. Dochev, Ralica Sabeva, Lubomir Kenderov, Vesela V. Evtimova, Mihail Iliev, Boyanka Angelova
The current study is part of a comprehensive investigation of the natural phenomenon Underwater Petrified Forest, which has no analog in the Black Sea and is very rare worldwide. The team aims to conduct a comprehensive study of the unique habitat, paleontological and geological phenomenon, the Petrified Forest, and to address a series of scientific questions. This research sheds light on the sedimentation processes related to the fossilization of tree species. X-ray phase analyses were used to compare clay rocks that encase and cover the fossilized trees.
目前的研究是对自然现象 "水下石化森林 "进行全面调查的一部分，该现象在黑海没有类似物，在全世界也非常罕见。研究小组旨在对石化森林这一独特的栖息地、古生物和地质现象进行全面研究，并解决一系列科学问题。这项研究揭示了与树种化石有关的沉积过程。通过 X 射线相分析，对包裹和覆盖树木化石的粘土岩进行了比较。
{"title":"New geological and X-ray diffraction data from sedimentary rocks in the area of Underwater Petrified Forest natural phenomenon, Sozopol Bay, Black Sea","authors":"Stefan Velev, D. Dochev, Ralica Sabeva, Lubomir Kenderov, Vesela V. Evtimova, Mihail Iliev, Boyanka Angelova","doi":"10.52215/rev.bgs.2023.84.3.197","DOIUrl":"https://doi.org/10.52215/rev.bgs.2023.84.3.197","url":null,"abstract":"The current study is part of a comprehensive investigation of the natural phenomenon Underwater Petrified Forest, which has no analog in the Black Sea and is very rare worldwide. The team aims to conduct a comprehensive study of the unique habitat, paleontological and geological phenomenon, the Petrified Forest, and to address a series of scientific questions. This research sheds light on the sedimentation processes related to the fossilization of tree species. X-ray phase analyses were used to compare clay rocks that encase and cover the fossilized trees.","PeriodicalId":509487,"journal":{"name":"Review of the Bulgarian Geological Society","volume":"36 6-7","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139189076","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}
Pub Date : 2023-12-01DOI: 10.52215/rev.bgs.2023.84.3.181
E. Koleva-Rekalova
The Bessarabian (Sarmatian) limestones composed mainly of endemic foraminifera Nubicularia novorossica are studied in detail in three sections between the village of Tyulenovo and Cape Shabla (Northeastern Bulgaria). An important reef buildup found in the upper levels of the sections allows to reconstruct the climatic and paleoenvironmental conditions. The most prominent changes are а shift from subtropical to drier climate and increased wave activity. This led to a decrease in the amount of Nubicularia novorossica and an increase in encrusting organisms such as encrusting nubicularia, bryozoans and red algae, which protected the newly formed sediments from destruction by the strong wave disturbance. The occurrence of less favorable climatic conditions is also evidenced by the presence of microbial micrite masses in the reef limestones.
{"title":"The Bessarabian (Sarmatian) reef buildup between the village of Tyulenovo and Cape Shabla (Northeastern Bulgaria) as climatic and paleoecological indicator","authors":"E. Koleva-Rekalova","doi":"10.52215/rev.bgs.2023.84.3.181","DOIUrl":"https://doi.org/10.52215/rev.bgs.2023.84.3.181","url":null,"abstract":"The Bessarabian (Sarmatian) limestones composed mainly of endemic foraminifera Nubicularia novorossica are studied in detail in three sections between the village of Tyulenovo and Cape Shabla (Northeastern Bulgaria). An important reef buildup found in the upper levels of the sections allows to reconstruct the climatic and paleoenvironmental conditions. The most prominent changes are а shift from subtropical to drier climate and increased wave activity. This led to a decrease in the amount of Nubicularia novorossica and an increase in encrusting organisms such as encrusting nubicularia, bryozoans and red algae, which protected the newly formed sediments from destruction by the strong wave disturbance. The occurrence of less favorable climatic conditions is also evidenced by the presence of microbial micrite masses in the reef limestones.","PeriodicalId":509487,"journal":{"name":"Review of the Bulgarian Geological Society","volume":"298 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139188212","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}
Pub Date : 2023-12-01DOI: 10.52215/rev.bgs.2023.84.3.177
L. Hristova, D. Dochev, L. Metodiev, Vladimir Nikolov
The fossils of cetaceans are common in the Miocene marine deposits of North Bulgaria and along the Black Sea coast, however, they had received little attention until now. We report on abundant whale fossil material from the area near General Marinovo Village, NW Bulgaria. The finding of a hipparion tooth in the same area as the rest of the material implies a late Miocene age for the fossils. Taphonomical, XRD, and palaeohistological analyses reveal details about the pre-burial history and palaeobiology of part of the studied cetacean fossils.
鲸目动物化石在保加利亚北部和黑海沿岸的中新世海洋沉积物中很常见，但迄今为止很少受到关注。我们报告了保加利亚西北部 General Marinovo 村附近地区丰富的鲸化石材料。在与其他材料相同的区域发现了一颗河马齿，这意味着这些化石的年代为中新世晚期。陶片学、X射线衍射和古生物学分析揭示了所研究的部分鲸目动物化石的埋藏前历史和古生物学细节。
{"title":"Cetacean and hipparion fossils from the upper Miocene near General Marinovo Village, NW Bulgaria","authors":"L. Hristova, D. Dochev, L. Metodiev, Vladimir Nikolov","doi":"10.52215/rev.bgs.2023.84.3.177","DOIUrl":"https://doi.org/10.52215/rev.bgs.2023.84.3.177","url":null,"abstract":"The fossils of cetaceans are common in the Miocene marine deposits of North Bulgaria and along the Black Sea coast, however, they had received little attention until now. We report on abundant whale fossil material from the area near General Marinovo Village, NW Bulgaria. The finding of a hipparion tooth in the same area as the rest of the material implies a late Miocene age for the fossils. Taphonomical, XRD, and palaeohistological analyses reveal details about the pre-burial history and palaeobiology of part of the studied cetacean fossils.","PeriodicalId":509487,"journal":{"name":"Review of the Bulgarian Geological Society","volume":"106 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139188240","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}
Pub Date : 2023-12-01DOI: 10.52215/rev.bgs.2023.84.3.345
Radostina Rizova, Dimitar Sachkov, V. Sachanski
The present paper addresses investigation of modern morphodynamic processes, which lead to relief modelling on one hand and the formation of new landforms and deposits on the other. Erosional, denudational and gravitational landforms and deposits were observed in three key areas in the Zavalska Mountain (Western Srednogorie), Strazha and Lyubash (Kraishte). The aim of this study is to trace the intensity of exogenous landforming processes, to characterize the deposits and elucidate the connection between the geological base, the topography and the local hydroclimatic conditions for their genesis and dynamics. To achieve this goal, field and laboratory methods were employed, as well as data from an automatic weather station in the territory of the Breznik Municipality. Despite the short observation period of three months, the data reveal significant dynamics, rendering the selected study areas interesting for future research.
{"title":"Modern morphodynamic processes and deposits in Western Srednogorie and Kraishte","authors":"Radostina Rizova, Dimitar Sachkov, V. Sachanski","doi":"10.52215/rev.bgs.2023.84.3.345","DOIUrl":"https://doi.org/10.52215/rev.bgs.2023.84.3.345","url":null,"abstract":"The present paper addresses investigation of modern morphodynamic processes, which lead to relief modelling on one hand and the formation of new landforms and deposits on the other. Erosional, denudational and gravitational landforms and deposits were observed in three key areas in the Zavalska Mountain (Western Srednogorie), Strazha and Lyubash (Kraishte). The aim of this study is to trace the intensity of exogenous landforming processes, to characterize the deposits and elucidate the connection between the geological base, the topography and the local hydroclimatic conditions for their genesis and dynamics. To achieve this goal, field and laboratory methods were employed, as well as data from an automatic weather station in the territory of the Breznik Municipality. Despite the short observation period of three months, the data reveal significant dynamics, rendering the selected study areas interesting for future research.","PeriodicalId":509487,"journal":{"name":"Review of the Bulgarian Geological Society","volume":"24 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139190823","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}
Pub Date : 2023-12-01DOI: 10.52215/rev.bgs.2023.84.3.147
N. Bonev, P. Filipov
The Circum-Rhodope belt is a major tectonic unit in the Alpine orogen of northern Aegean region, which consists of metasedimentary rocks and unmetamorphosed arc-related Jurassic Evros ophiolite. Here, we review the biostratigraphic and detrital zircon ages available for the distinct units of the eastern Circum-Rhodope belt in Bulgaria and Greece. Both, biostratigraphic and radiometric ages consistently reveal a Middle Triassic to latest Late Jurassic timing of the sedimentation. Most importantly, the continuous depositional record sketches sedimentary sources from the continental margin (Rhodope) and the Jurassic arc system (Evros ophiolite) as documented mostly by the detrital zircons in clastic successions.
{"title":"A review of depositional ages of the metasedimentary rocks in the units of the eastern Circum-Rhodope belt, Bulgaria-Greece","authors":"N. Bonev, P. Filipov","doi":"10.52215/rev.bgs.2023.84.3.147","DOIUrl":"https://doi.org/10.52215/rev.bgs.2023.84.3.147","url":null,"abstract":"The Circum-Rhodope belt is a major tectonic unit in the Alpine orogen of northern Aegean region, which consists of metasedimentary rocks and unmetamorphosed arc-related Jurassic Evros ophiolite. Here, we review the biostratigraphic and detrital zircon ages available for the distinct units of the eastern Circum-Rhodope belt in Bulgaria and Greece. Both, biostratigraphic and radiometric ages consistently reveal a Middle Triassic to latest Late Jurassic timing of the sedimentation. Most importantly, the continuous depositional record sketches sedimentary sources from the continental margin (Rhodope) and the Jurassic arc system (Evros ophiolite) as documented mostly by the detrital zircons in clastic successions.","PeriodicalId":509487,"journal":{"name":"Review of the Bulgarian Geological Society","volume":"38 6","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139192359","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}
Pub Date : 2023-12-01DOI: 10.52215/rev.bgs.2023.84.3.359
Andrei Korzhenkov, Aleksandr Ovsyuchenko, O. Dimitrov, Todor Dimov, A. Larkov, B. Ranguelov, Nikolay Dobrev
The most northeastern part of the territory of Bulgaria is characterized by high seismicity. In 2019, archeoseismological studies of traces of strong earthquakes were carried out in the oldest architectural monument in Europe – Durankulak. There are reports of earthquakes in these places in the Middle Ages and in Аntiquity, but the data on the location of their foci is unspecified. Therefore, a team of scientists from Bulgaria and Russia carried out special scientific research on the islands in Lake Durankulak. A large number of artifacts have been found on the Big Island. The ruins located there are very old and have fixed traces of seismic impacts that have occurred over a long period of time. As a result of paleoseismological and archaeoseismological studies, three major earthquakes have been identified. Most likely, the focus of the first is connected to the Intramysian fault, and the focus of the second and third to the Shabla-Kaliakra seismic zone. The first was between VIII and IX degree on the scale of MSK 64, the second between IX and X, the third also between VIII and IX degree on the same scale.
保加利亚领土最东北部的特点是地震频发。2019 年，在欧洲最古老的建筑遗迹--杜兰库拉克（Durankulak）进行了强震痕迹考古研究。有报告称，这些地方在中世纪和古代曾发生过地震，但关于地震中心位置的数据却不详。因此，保加利亚和俄罗斯的科学家团队对杜兰库拉克湖中的岛屿进行了专门的科学研究。在大岛发现了大量文物。那里的遗址非常古老，有长期地震冲击留下的固定痕迹。经过古地震学和考古地震学研究，确定了三次大地震。第一次地震的震源很可能与英特拉米西亚断层有关，第二次和第三次地震的震源则与沙布拉-卡利亚克拉地震带有关。第一次地震的震级在 MSK 64 的 VIII 和 IX 级之间，第二次地震的震级在 IX 和 X 级之间，第三次地震的震级同样在 VIII 和 IX 级之间。
{"title":"Archaeoseismological study in northeastern Bulgaria: Islands in Durankulak Lake","authors":"Andrei Korzhenkov, Aleksandr Ovsyuchenko, O. Dimitrov, Todor Dimov, A. Larkov, B. Ranguelov, Nikolay Dobrev","doi":"10.52215/rev.bgs.2023.84.3.359","DOIUrl":"https://doi.org/10.52215/rev.bgs.2023.84.3.359","url":null,"abstract":"The most northeastern part of the territory of Bulgaria is characterized by high seismicity. In 2019, archeoseismological studies of traces of strong earthquakes were carried out in the oldest architectural monument in Europe – Durankulak. There are reports of earthquakes in these places in the Middle Ages and in Аntiquity, but the data on the location of their foci is unspecified. Therefore, a team of scientists from Bulgaria and Russia carried out special scientific research on the islands in Lake Durankulak. A large number of artifacts have been found on the Big Island. The ruins located there are very old and have fixed traces of seismic impacts that have occurred over a long period of time. As a result of paleoseismological and archaeoseismological studies, three major earthquakes have been identified. Most likely, the focus of the first is connected to the Intramysian fault, and the focus of the second and third to the Shabla-Kaliakra seismic zone. The first was between VIII and IX degree on the scale of MSK 64, the second between IX and X, the third also between VIII and IX degree on the same scale.","PeriodicalId":509487,"journal":{"name":"Review of the Bulgarian Geological Society","volume":"85 2","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139193064","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}
Pub Date : 2023-12-01DOI: 10.52215/rev.bgs.2023.84.3.185
L. Metodiev, D. Dochev, Milena Georgieva, Tania Stoylkova, E. Koleva-Rekalova, Iliya Dimitrov, I. Savov
The relative durations of ammonite biozones and selected ammonite taxa, as well as some bioevents associated with coeval Lower–Middle Jurassic benthic taxa are represented herein. Based on linked Sr-isotope data, we found a notable difference in the time spans of the zones and in the relative longevity of the guiding ammonite genera around the Pliensbachian/Toarcian (P/T) boundary. The last occurrences of the well-known late Pliensbachian bivalve taxa Gryphaea gigantea and Pseudopecten aequivalvis were dated at 184 Ma and 183.8 Ma, respectively. Recently defined Toarcian–Aalenian autochtonous brachiopod taxa (Bulgariarhynchia and Capillirhynchia brezenensis) were found to have significant taxonomic durations (2 Ma and 5 Ma). The Sr-isotope data also revealed ~2 Ma duration of seawater warming and 0.2 Ma fossil hiatus around the P/T boundary.
本文介绍了鹦鹉螺生物区和部分鹦鹉螺类群的相对持续时间，以及与共生的侏罗纪下-中统底栖类群相关的一些生物事件。根据相关的锶同位素数据，我们发现在普利恩巴赫/托阿尔卡斯（P/T）边界附近，各区的时间跨度和指导性的鹦鹉螺类群的相对寿命存在明显差异。著名的普利恩巴赫晚期双壳类群 Gryphaea gigantea 和 Pseudopecten aequivalvis 的最后出现时间分别为 184 Ma 和 183.8 Ma。最近确定的托阿尔纪-阿伦纪自生腕足类群（Bulgariarhynchia 和 Capillirhynchia brezenensis）被发现具有显著的分类持续时间（2 Ma 和 5 Ma）。锶同位素数据还揭示了海水变暖的持续时间（约 2 Ma）和 P/T 边界附近 0.2 Ma 的化石间断期。
{"title":"Duration of ammonite zones and characteristic Jurassic fossil taxa from the Pliensbachian–Aalenian successions of Bulgaria","authors":"L. Metodiev, D. Dochev, Milena Georgieva, Tania Stoylkova, E. Koleva-Rekalova, Iliya Dimitrov, I. Savov","doi":"10.52215/rev.bgs.2023.84.3.185","DOIUrl":"https://doi.org/10.52215/rev.bgs.2023.84.3.185","url":null,"abstract":"The relative durations of ammonite biozones and selected ammonite taxa, as well as some bioevents associated with coeval Lower–Middle Jurassic benthic taxa are represented herein. Based on linked Sr-isotope data, we found a notable difference in the time spans of the zones and in the relative longevity of the guiding ammonite genera around the Pliensbachian/Toarcian (P/T) boundary. The last occurrences of the well-known late Pliensbachian bivalve taxa Gryphaea gigantea and Pseudopecten aequivalvis were dated at 184 Ma and 183.8 Ma, respectively. Recently defined Toarcian–Aalenian autochtonous brachiopod taxa (Bulgariarhynchia and Capillirhynchia brezenensis) were found to have significant taxonomic durations (2 Ma and 5 Ma). The Sr-isotope data also revealed ~2 Ma duration of seawater warming and 0.2 Ma fossil hiatus around the P/T boundary.","PeriodicalId":509487,"journal":{"name":"Review of the Bulgarian Geological Society","volume":"102 ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139195578","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}
Pub Date : 2023-12-01DOI: 10.52215/rev.bgs.2023.84.3.133
I. Peytcheva, Šime Bilić, Stoyan Georgiev, Ivica Pavičić, F. Šumanovac, A. Hikov, Marko Holma, M. Guillong, Ivan Grubišić
The present study provides geochemical and geochronological data about Posušje bauxites in Bosnia and Herzegovina with the aim to characterize them as Critical Raw Materials (CRMs) sources and to put constraints on the time and genesis of the deposit. Boehmite is the bauxites’ main Al-bearing mineral, while gibbsite is a minor constituent. Hematite is the dominant Fe-phase, whereas goethite is rare. The chemical analyses indicate that the Al2O3 content ranges from 49.6 to 63.0 wt %, Fe2O3 varies from 16.5 to 33.7 wt % and the SiO2 content is usually <0.5 wt %. TiO2 content ranges between 2.6 and 3.2 wt %. Typical trace elements are V (353–787 ppm), Cr (498–1055 ppm), Zr (382–558 ppm), Sc (42–72 ppm), and Ga (40–47 ppm). The sum of REEs is 357–1112 ppm. The U-Pb zircon dating indicates an age of Posušje bauxite formation at 56.6±0.5 Ma. This age closely aligns with the global climatic event that occurred approximately 56 Ma ago, called Paleocene–Eocene Thermal Maximum (PETM).
{"title":"Posušje bauxites in Bosnia and Herzegovina: A source of critical raw materials and a paleoclimatic marker","authors":"I. Peytcheva, Šime Bilić, Stoyan Georgiev, Ivica Pavičić, F. Šumanovac, A. Hikov, Marko Holma, M. Guillong, Ivan Grubišić","doi":"10.52215/rev.bgs.2023.84.3.133","DOIUrl":"https://doi.org/10.52215/rev.bgs.2023.84.3.133","url":null,"abstract":"The present study provides geochemical and geochronological data about Posušje bauxites in Bosnia and Herzegovina with the aim to characterize them as Critical Raw Materials (CRMs) sources and to put constraints on the time and genesis of the deposit. Boehmite is the bauxites’ main Al-bearing mineral, while gibbsite is a minor constituent. Hematite is the dominant Fe-phase, whereas goethite is rare. The chemical analyses indicate that the Al2O3 content ranges from 49.6 to 63.0 wt %, Fe2O3 varies from 16.5 to 33.7 wt % and the SiO2 content is usually <0.5 wt %. TiO2 content ranges between 2.6 and 3.2 wt %. Typical trace elements are V (353–787 ppm), Cr (498–1055 ppm), Zr (382–558 ppm), Sc (42–72 ppm), and Ga (40–47 ppm). The sum of REEs is 357–1112 ppm. The U-Pb zircon dating indicates an age of Posušje bauxite formation at 56.6±0.5 Ma. This age closely aligns with the global climatic event that occurred approximately 56 Ma ago, called Paleocene–Eocene Thermal Maximum (PETM).","PeriodicalId":509487,"journal":{"name":"Review of the Bulgarian Geological Society","volume":"490 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139188249","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}
Pub Date : 2023-12-01DOI: 10.52215/rev.bgs.2023.84.3.363
Elitsa Zareva, Kameliya Marinova
Information guide was created within the framework of a project for artistic and creative activity in the field of science. Its purpose is to present the museums at University of Mining and Geology „St. Ivan Rilski“ – Museum of Unique Crystals “Ilia Deleff”, Museum of Geology and Paleontology, Museum of Mineralogy, Petrography and Resources and Museum of Physics. in a modern and attractive way, accessible to a wide range of people. The guide has a direct connection with the virtual tours of the four museums of the university developed in a previous project, through which the audience gets to know the exhibits in the museums from a distance.
{"title":"Contemporary trends and interactive forms of presentation of the museums at the University of Mining and Geology “St. Ivan Rilski”","authors":"Elitsa Zareva, Kameliya Marinova","doi":"10.52215/rev.bgs.2023.84.3.363","DOIUrl":"https://doi.org/10.52215/rev.bgs.2023.84.3.363","url":null,"abstract":"Information guide was created within the framework of a project for artistic and creative activity in the field of science. Its purpose is to present the museums at University of Mining and Geology „St. Ivan Rilski“ – Museum of Unique Crystals “Ilia Deleff”, Museum of Geology and Paleontology, Museum of Mineralogy, Petrography and Resources and Museum of Physics. in a modern and attractive way, accessible to a wide range of people. The guide has a direct connection with the virtual tours of the four museums of the university developed in a previous project, through which the audience gets to know the exhibits in the museums from a distance.","PeriodicalId":509487,"journal":{"name":"Review of the Bulgarian Geological Society","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139188265","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}
京公网安备 11010802042870号
京ICP备2023020795号-1
扫码关注我们
求助内容：
应助结果提醒方式：