Pub Date : 2023-12-01DOI: 10.52215/rev.bgs.2023.84.3.193
S. Petrova, P. Andreeva, I. Lakova
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 Calpionella zones, further divided into subzones. The stratigraphical ranges of 22 chitinoidellid (the genera Almajella, Borziella, Carpathella, Chitinoidella, Daciella, Dobeniella, Longicollaria, and Praetintinnopsella) and 26 calpionellid species of the genera Tintinnopsella, Crassicollaria, Calpionella, Remaniella, Borzaiella and Lorenziella have been recorded. Eight microfacies, two of which in the Gintsi Formation, and six microfacies in the Glozhene Formation have been distinguished, all being wackestones and mudstones, characteristic of open-marine pelagic deposits and differing from each other in the prevailing bioclasts. The Tithonian/Berriasian boundary was tentatively drawn at the Crassicollaria/Calpionella boundary.
{"title":"Calpionellid biostratigraphy and microfacies across the Tithonian/Berriasian boundary interval in the Western Fore-Balkan, Bulgaria","authors":"S. Petrova, P. Andreeva, I. Lakova","doi":"10.52215/rev.bgs.2023.84.3.193","DOIUrl":"https://doi.org/10.52215/rev.bgs.2023.84.3.193","url":null,"abstract":"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 Calpionella zones, further divided into subzones. The stratigraphical ranges of 22 chitinoidellid (the genera Almajella, Borziella, Carpathella, Chitinoidella, Daciella, Dobeniella, Longicollaria, and Praetintinnopsella) and 26 calpionellid species of the genera Tintinnopsella, Crassicollaria, Calpionella, Remaniella, Borzaiella and Lorenziella have been recorded. Eight microfacies, two of which in the Gintsi Formation, and six microfacies in the Glozhene Formation have been distinguished, all being wackestones and mudstones, characteristic of open-marine pelagic deposits and differing from each other in the prevailing bioclasts. The Tithonian/Berriasian boundary was tentatively drawn at the Crassicollaria/Calpionella boundary.","PeriodicalId":509487,"journal":{"name":"Review of the Bulgarian Geological Society","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139193378","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.2023.84.3.81
P. Filipov
New findings of monzogabbro and gabbro-monzodiorite dykes aged 62 Ma reveal the existence of magmatism in the gap between termination of the Late Cretaceous subduction-related and start of the early–middle Eocene post-collisional magmatic stages in the Rhodope Massif. Their geochemical compositions strongly resemble adakitic signature as well as hornblende and epidote geobarometers predicted lower crustal conditions (20–30 km depth) of crystallization. Detailed studies on U-Pb geochronology of zircon populations and Sr-Nd-Hf isotopic compositions point to significant assimilation of the local basement and mixing of mantle-crust sources in the regime of a thickened crust.
年龄为 62 Ma 的单斜辉长岩和辉长岩-单斜辉长岩岩体的新发现揭示了罗多彼山丘在晚白垩世俯冲相关阶段结束与早中新世碰撞后岩浆阶段开始之间的岩浆活动。它们的地球化学成分与阿达克特特征以及角闪石和榍石测地仪预测的低地壳结晶条件（20-30 千米深度）十分相似。对锆石群的 U-Pb 地球年代学和 Sr-Nd-Hf 同位素组成的详细研究表明，在地壳增厚的情况下，当地基底和地幔-地壳源混合的同化作用显著。
{"title":"Mafic adakite-like magmatism at the Cretaceous–Paleogene boundary from the Northwest Rhodopes, Bulgaria","authors":"P. Filipov","doi":"10.52215/rev.bgs.2023.84.3.81","DOIUrl":"https://doi.org/10.52215/rev.bgs.2023.84.3.81","url":null,"abstract":"New findings of monzogabbro and gabbro-monzodiorite dykes aged 62 Ma reveal the existence of magmatism in the gap between termination of the Late Cretaceous subduction-related and start of the early–middle Eocene post-collisional magmatic stages in the Rhodope Massif. Their geochemical compositions strongly resemble adakitic signature as well as hornblende and epidote geobarometers predicted lower crustal conditions (20–30 km depth) of crystallization. Detailed studies on U-Pb geochronology of zircon populations and Sr-Nd-Hf isotopic compositions point to significant assimilation of the local basement and mixing of mantle-crust sources in the regime of a thickened crust.","PeriodicalId":509487,"journal":{"name":"Review of the Bulgarian Geological Society","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139195002","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":null,"pages":null},"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":null,"pages":null},"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":null,"pages":null},"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":null,"pages":null},"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":null,"pages":null},"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":null,"pages":null},"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":null,"pages":null},"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.
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