Pub Date : 2023-12-01DOI: 10.52215/rev.bgs.2023.84.3.55
Tsveta Stanimirovа, G. Kirov
Hydroxyl sodalite and sulfate cancrinite were synthesized from fly ash from TPP Varna, Bulgaria. The interaction of the two feldspathoids with NH4NO3 solution at 90 °C was investigated. Because of the reaction, sodalite is dissolved and ammonium feldspar (buddingtonite) is formed, which is the first case of low-temperature synthesis of this mineral. The interaction of cancrinite with NH4NO3 induces ion exchange and the formation of cancrinite with composition (NH4)5.4Na3.6(NO3)1.45(SO4)0.25(OH)0.05[Al6Si6O24]·2H2O, suggesting potential for the use of this form as a slow-acting fertilizer.
{"title":"Interaction of sodalite and cancrinite with NH4NO3 solution. First case of low-temperature synthesis of buddingtonite","authors":"Tsveta Stanimirovа, G. Kirov","doi":"10.52215/rev.bgs.2023.84.3.55","DOIUrl":"https://doi.org/10.52215/rev.bgs.2023.84.3.55","url":null,"abstract":"Hydroxyl sodalite and sulfate cancrinite were synthesized from fly ash from TPP Varna, Bulgaria. The interaction of the two feldspathoids with NH4NO3 solution at 90 °C was investigated. Because of the reaction, sodalite is dissolved and ammonium feldspar (buddingtonite) is formed, which is the first case of low-temperature synthesis of this mineral. The interaction of cancrinite with NH4NO3 induces ion exchange and the formation of cancrinite with composition (NH4)5.4Na3.6(NO3)1.45(SO4)0.25(OH)0.05[Al6Si6O24]·2H2O, suggesting potential for the use of this form as a slow-acting fertilizer.","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":"139194607","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.2023.84.3.241
Mariya Georgieva, Rositsa Titorenkova, Stephan Kozhukharov
The recent brief work presents the results of attempts to simplify a procedure to detect dissolved Hg(II) compounds. It is based on the performance of a procedure, after the simplification of the prescription given in literature. The simplification was performed, to avoid the use of volatile organic compounds (VOC), such as the proposed in literature isoamyl alcohol. The present study aims to verify a simplified procedure, which does not require the use of mentioned VOC and detergents, like sodium dodecyl sulfate.
{"title":"A simplified spectrophotometric procedure for the detection of mercury ions","authors":"Mariya Georgieva, Rositsa Titorenkova, Stephan Kozhukharov","doi":"10.52215/rev.bgs.2023.84.3.241","DOIUrl":"https://doi.org/10.52215/rev.bgs.2023.84.3.241","url":null,"abstract":"The recent brief work presents the results of attempts to simplify a procedure to detect dissolved Hg(II) compounds. It is based on the performance of a procedure, after the simplification of the prescription given in literature. The simplification was performed, to avoid the use of volatile organic compounds (VOC), such as the proposed in literature isoamyl alcohol. The present study aims to verify a simplified procedure, which does not require the use of mentioned VOC and detergents, like sodium dodecyl sulfate.","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":"139195489","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.2023.84.3.307
D. Polomcic, Jelena Ratković, Vesna Ristić Vakanjac
With the creation of a hydrodynamic model, the need for it usually ceases until some next moment when the model needs to be updated and used for the set task for the necessary project documentation or dedicated studies. It is relatively rare that almost every year the model is improved and used for forecast calculations. The paper presents the basic characteristics and development of the hydrodynamic model of the open pit mine “Drmno” for 25 years. This open pit mine is the second-largest mine in Serbia. At the time the model was made (1998), it was the largest and most complex model that was made in the former Yugoslavia. Also, advanced model calibration techniques were used for the first time in Serbia
{"title":"History of the development of the hydrodynamic model of the open pit mine “Drmno”, Serbia","authors":"D. Polomcic, Jelena Ratković, Vesna Ristić Vakanjac","doi":"10.52215/rev.bgs.2023.84.3.307","DOIUrl":"https://doi.org/10.52215/rev.bgs.2023.84.3.307","url":null,"abstract":"With the creation of a hydrodynamic model, the need for it usually ceases until some next moment when the model needs to be updated and used for the set task for the necessary project documentation or dedicated studies. It is relatively rare that almost every year the model is improved and used for forecast calculations. The paper presents the basic characteristics and development of the hydrodynamic model of the open pit mine “Drmno” for 25 years. This open pit mine is the second-largest mine in Serbia. At the time the model was made (1998), it was the largest and most complex model that was made in the former Yugoslavia. Also, advanced model calibration techniques were used for the first time in Serbia","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":"139196084","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.2023.84.3.333
Nikolay Dimitrov, R. Nakov
The region of west Bulgaria and especially southwest Bulgaria is geodynamically active region due to the large number of active faults. The observation of geodynamic processes using GNSS measurements in the area has been going on for more than 26 years involving 38 stations. This article shows the latest results of the monitoring of modern crustal movements in the area. Presently, 26 points are measured, 10 of them newly added. GNSS data obtained from periodic campaign measurements between 1997 and 2023 are processed and analyzed to obtain the result of points movements geodynamic network and deformation accumulation. As a result of many years of periodic measurements, much more accurate and reliable results for point velocities are obtained. The velocity rates are between 1–2 mm/y in the north and 3–4 mm/y in the southernmost part of the area. The new results clearly confirm this as well as the extensive movement of southwestern Bulgaria to the south. The results obtained from the addition of 10 new points and the expansion of the network provide better and more detailed information and can be used for detailed geodynamic and geological research of the active tectonics in the area.
{"title":"Monitoring of recent crustal movements in the region of western Bulgaria. Results from 2023","authors":"Nikolay Dimitrov, R. Nakov","doi":"10.52215/rev.bgs.2023.84.3.333","DOIUrl":"https://doi.org/10.52215/rev.bgs.2023.84.3.333","url":null,"abstract":"The region of west Bulgaria and especially southwest Bulgaria is geodynamically active region due to the large number of active faults. The observation of geodynamic processes using GNSS measurements in the area has been going on for more than 26 years involving 38 stations. This article shows the latest results of the monitoring of modern crustal movements in the area. Presently, 26 points are measured, 10 of them newly added. GNSS data obtained from periodic campaign measurements between 1997 and 2023 are processed and analyzed to obtain the result of points movements geodynamic network and deformation accumulation. As a result of many years of periodic measurements, much more accurate and reliable results for point velocities are obtained. The velocity rates are between 1–2 mm/y in the north and 3–4 mm/y in the southernmost part of the area. The new results clearly confirm this as well as the extensive movement of southwestern Bulgaria to the south. The results obtained from the addition of 10 new points and the expansion of the network provide better and more detailed information and can be used for detailed geodynamic and geological research of the active tectonics in the area.","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":"139189122","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.2023.84.3.323
Tanya Vasileva, Vasil Petrov
The recent study presents main results of a re-evaluation of the mineral water and geothermal energy of the Devin hydro-mineral deposit, Smolyan region. The deposit occupies an area of about 16 km2, and coincids with the narrow valley of the Devinska River. Hydrochemical methods are applied and chloro-alkaline relations are determined to evaluate the ion exchange and the genesis of the mineral water. The reservoir occurred in a Paleogene tectonic graben filled with breccia-conglomerates, conglomerates, sandstones, and argillites. The mineral water has a composition expressed in equivalent units for cations: Na+ > Mg2+ > Ca2+ > K+, and for anions: (CO3–2+HCO3–) > SO42– > Cl–. The water is of NaHCO3– type, fluorine with a fluoride concentration of 3.7–7.0 mg/L and H2SO3 from 44.62 to 64 mg/L. The TDS content of 247 to 316 mg/l, isothermal to hyperthermal in depth. The regional resources are estimated at 21 l/s and the local resources are estimated at 17.23 l/s. The local geothermal energy of the Devin reservoir reaches 1.212 M J/s.
{"title":"Reassessment of the resources and hydrochemistry assessment of the Devin hydrothermal mineral deposit, Smolyan region","authors":"Tanya Vasileva, Vasil Petrov","doi":"10.52215/rev.bgs.2023.84.3.323","DOIUrl":"https://doi.org/10.52215/rev.bgs.2023.84.3.323","url":null,"abstract":"The recent study presents main results of a re-evaluation of the mineral water and geothermal energy of the Devin hydro-mineral deposit, Smolyan region. The deposit occupies an area of about 16 km2, and coincids with the narrow valley of the Devinska River. Hydrochemical methods are applied and chloro-alkaline relations are determined to evaluate the ion exchange and the genesis of the mineral water. The reservoir occurred in a Paleogene tectonic graben filled with breccia-conglomerates, conglomerates, sandstones, and argillites. The mineral water has a composition expressed in equivalent units for cations: Na+ > Mg2+ > Ca2+ > K+, and for anions: (CO3–2+HCO3–) > SO42– > Cl–. The water is of NaHCO3– type, fluorine with a fluoride concentration of 3.7–7.0 mg/L and H2SO3 from 44.62 to 64 mg/L. The TDS content of 247 to 316 mg/l, isothermal to hyperthermal in depth. The regional resources are estimated at 21 l/s and the local resources are estimated at 17.23 l/s. The local geothermal energy of the Devin reservoir reaches 1.212 M J/s.","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":"139190158","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.2023.84.3.151
Neven Georgiev
The short lasting compressional to transpressional tectonic event between the latest Oligocene and Middle Miocene is an important element of the Late Alpine evolution of the Balkan peninsula and the Aegean area. It is well recorded by the termination of the sedimentation in a relatively short period of 6–7 Ma (between 20.5 Ma and ~13 Ma). This crustal shortening represents a stage of the Late Alpine tectonic evolution of the area separating the late Paleogene extensional regime from the Aegean extension that took place from ~13 Ma on and finally shaped this branch of the orogen.
巴尔干半岛和爱琴海地区晚阿尔卑斯山演化过程中的一个重要因素，是在晚渐新世和中新世之间发生的从压缩到换位的短暂构造事件。在相对较短的 6-7 Ma 期间（20.5 Ma 至 ~13 Ma 之间），沉积作用终止，这很好地记录了这一事件。这种地壳缩短代表了该地区晚期阿尔卑斯构造演化的一个阶段，它将晚古新世的伸展机制与爱琴海的伸展机制分开，爱琴海的伸展始于约 13 Ma，并最终形成了这一造山分支。
{"title":"The short-lasted latest Oligocene–early Miocene “Circum Rhodope” compression and its relation to the main Late Alpine tectonic events on Balkan peninsula","authors":"Neven Georgiev","doi":"10.52215/rev.bgs.2023.84.3.151","DOIUrl":"https://doi.org/10.52215/rev.bgs.2023.84.3.151","url":null,"abstract":"The short lasting compressional to transpressional tectonic event between the latest Oligocene and Middle Miocene is an important element of the Late Alpine evolution of the Balkan peninsula and the Aegean area. It is well recorded by the termination of the sedimentation in a relatively short period of 6–7 Ma (between 20.5 Ma and ~13 Ma). This crustal shortening represents a stage of the Late Alpine tectonic evolution of the area separating the late Paleogene extensional regime from the Aegean extension that took place from ~13 Ma on and finally shaped this branch of the orogen.","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":"139191495","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.2023.84.3.351
A. Baltakova, R. Kenderova, Galina Samichkova, Vassil Nikolov
Archaeological excavations in the area of Gortalovo village, Pleven district (Middle Danube Lowland) found a cultural layer dated to 5000–4850 BC – the Late Neolithic period. The main practice of the agricultural and livestock breeding settlement established there was flint tools production. During the archaeological and interdisciplinary geomorphological field work buried sink-holes were found. Karstic landscape was covered with dark clayish soil, which was sampled for further sedimentological analysis. In the paper are presented the results from grain size analysis, which defines the characteristics of the top-layer and some indications of processes responsible for burying the karst features. The results showed that soil layer was developed on a karstified limestone, covered by loess sediments. The soil layer in the area is defined as heavy clayish chernozem and the middle soil profile responds to the filling of the dolines – darker and clayish.
{"title":"Buried karst landforms in the area of a Late Neolithic Settlement near Gortalovo village, Pleven district","authors":"A. Baltakova, R. Kenderova, Galina Samichkova, Vassil Nikolov","doi":"10.52215/rev.bgs.2023.84.3.351","DOIUrl":"https://doi.org/10.52215/rev.bgs.2023.84.3.351","url":null,"abstract":"Archaeological excavations in the area of Gortalovo village, Pleven district (Middle Danube Lowland) found a cultural layer dated to 5000–4850 BC – the Late Neolithic period. The main practice of the agricultural and livestock breeding settlement established there was flint tools production. During the archaeological and interdisciplinary geomorphological field work buried sink-holes were found. Karstic landscape was covered with dark clayish soil, which was sampled for further sedimentological analysis. In the paper are presented the results from grain size analysis, which defines the characteristics of the top-layer and some indications of processes responsible for burying the karst features. The results showed that soil layer was developed on a karstified limestone, covered by loess sediments. The soil layer in the area is defined as heavy clayish chernozem and the middle soil profile responds to the filling of the dolines – darker and clayish.","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":"139192290","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.2023.84.3.121
P. Marchev, Raya Raicheva, P. Filipov, R. Ivanova, Ioannis Baziotis
Volcanism during the Priabonian–Oligocene times (35–27 Ma) in the Rhodope Massif produced large volume of shoshonitic and calcalkaline lavas and three large volume silicic ignimbrites and fallout deposits. The youngest of these ignimbrites, named here as Perelik ignimbrite (PI), consists of three areas, previously described as three separate ignimbrite units, namely Bratsigovo-Dospat, Perelik and Kotili-Vitina. The ~300 m thick ignimbrites cover an area of 700 km2, 220 km2 and 350 km2, respectively. Our study demonstrates that these ignimbrites have identical ages of ~31.6 Ma and mineral and chemical compositions and are parts of a single large eruption. Based on these data, we suggest that the original areal coverage was much larger, possibly 3000 km2, with magma volume of ~1000 km3. These results classify the Perelik eruption as one of the largest European Oligocene supereruptions These ignimbrites have notably high phenocrystal content (40–50%) and are a relatively homogeneous chemical composition, which are characteristics features of the ‘monotonous intermediate’ ignimbrites. Here, we provide petrographic observations, and chemical and isotopic (Sr, Nd) analyses to explain the P-T conditions of crystallization of these ignimbrites.
{"title":"Petrology of the 31.6 Ma Central Rhodope Perelik monotonous intermediate ignimbrite eruption","authors":"P. Marchev, Raya Raicheva, P. Filipov, R. Ivanova, Ioannis Baziotis","doi":"10.52215/rev.bgs.2023.84.3.121","DOIUrl":"https://doi.org/10.52215/rev.bgs.2023.84.3.121","url":null,"abstract":"Volcanism during the Priabonian–Oligocene times (35–27 Ma) in the Rhodope Massif produced large volume of shoshonitic and calcalkaline lavas and three large volume silicic ignimbrites and fallout deposits. The youngest of these ignimbrites, named here as Perelik ignimbrite (PI), consists of three areas, previously described as three separate ignimbrite units, namely Bratsigovo-Dospat, Perelik and Kotili-Vitina. The ~300 m thick ignimbrites cover an area of 700 km2, 220 km2 and 350 km2, respectively. Our study demonstrates that these ignimbrites have identical ages of ~31.6 Ma and mineral and chemical compositions and are parts of a single large eruption. Based on these data, we suggest that the original areal coverage was much larger, possibly 3000 km2, with magma volume of ~1000 km3. These results classify the Perelik eruption as one of the largest European Oligocene supereruptions These ignimbrites have notably high phenocrystal content (40–50%) and are a relatively homogeneous chemical composition, which are characteristics features of the ‘monotonous intermediate’ ignimbrites. Here, we provide petrographic observations, and chemical and isotopic (Sr, Nd) analyses to explain the P-T conditions of crystallization of these ignimbrites.","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":"139192366","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.2023.84.3.109
R. Ivanova, D. Dimitrova, Ivanina Sergeeva, M. Yossifova, Alexander Vlahov
The contents of major and rare elements in 10 samples of altered (mainly zeolitized) pyroclastic rocks from the Eastern Rhodopes are investigated. The samples are selected to represent different secondary mineral associations specific to the area. The obtained results indicate that the diversity in secondary mineral associations has relatively little influence on the trace element geochemistry of zeolitized pyroclastic rocks in the Eastern Rhodopes. Regarding their trace and rare earth element composition, these rocks show the main characteristics seen in the acid lavas in the area.
{"title":"Trace element geochemistry of altered pyroclastic deposits from the Eastern Rhodopes (SE Bulgaria)","authors":"R. Ivanova, D. Dimitrova, Ivanina Sergeeva, M. Yossifova, Alexander Vlahov","doi":"10.52215/rev.bgs.2023.84.3.109","DOIUrl":"https://doi.org/10.52215/rev.bgs.2023.84.3.109","url":null,"abstract":"The contents of major and rare elements in 10 samples of altered (mainly zeolitized) pyroclastic rocks from the Eastern Rhodopes are investigated. The samples are selected to represent different secondary mineral associations specific to the area. The obtained results indicate that the diversity in secondary mineral associations has relatively little influence on the trace element geochemistry of zeolitized pyroclastic rocks in the Eastern Rhodopes. Regarding their trace and rare earth element composition, these rocks show the main characteristics seen in the acid lavas in the area.","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":"139193752","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.2023.84.3.117
P. Marchev, Raya Raicheva, P. Filipov, Brian Jicha, R. Spikings, R. Ivanova, Olivier Bachmann, M. Guillong, Aral Okay
Numerous Eocene and Oligocene volcanic tuff layers within the Eastern, Central and Southern Europe sedimentary basins attest to extensive volcanic activity. Tephra dispersal of these tuffs covers areas of more than 1 000 000 km2, and the volume of erupted material to 1000s of cubic kilometers. The sources of the eruptions, however, remain unknown. Using precise 40Ar/39Ar and U-Pb radiometric dating, we correlate some of these tuff layers to three silicic Rhodope Massif Rupelian (еarly Oligocene) supereruptions dated at 33.2 Ma, 32.8 Ma and 31.6 Ma and named Dazhdovnitsa, Borovitsa and Perelik. Hence, these tuff layers can now be used as regional stratigraphic isochronous marker horizons for correlating, dating and synchronizing deposits and events in geologic and paleoenvironmental studies.
{"title":"40Ar/39Ar and U-Pb age correlations of the large Rupelian Rhodope Massif eruptions with airfall tuffs in SE, S and Central Europe","authors":"P. Marchev, Raya Raicheva, P. Filipov, Brian Jicha, R. Spikings, R. Ivanova, Olivier Bachmann, M. Guillong, Aral Okay","doi":"10.52215/rev.bgs.2023.84.3.117","DOIUrl":"https://doi.org/10.52215/rev.bgs.2023.84.3.117","url":null,"abstract":"Numerous Eocene and Oligocene volcanic tuff layers within the Eastern, Central and Southern Europe sedimentary basins attest to extensive volcanic activity. Tephra dispersal of these tuffs covers areas of more than 1 000 000 km2, and the volume of erupted material to 1000s of cubic kilometers. The sources of the eruptions, however, remain unknown. Using precise 40Ar/39Ar and U-Pb radiometric dating, we correlate some of these tuff layers to three silicic Rhodope Massif Rupelian (еarly Oligocene) supereruptions dated at 33.2 Ma, 32.8 Ma and 31.6 Ma and named Dazhdovnitsa, Borovitsa and Perelik. Hence, these tuff layers can now be used as regional stratigraphic isochronous marker horizons for correlating, dating and synchronizing deposits and events in geologic and paleoenvironmental studies.","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":"139194206","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}
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