Pub Date : 2024-09-04DOI: 10.1134/s1028334x24603262
D. A. Lopatina, O. G. Zanina, A. V. Lopatin
Abstract
The existence of vegetation of open environments with a predominance of grass–forb meadow associations and the participation of pine–oak forests was reconstructed on the basis of study of microphytofossils from the Lower Pleistocene deposits of the Taurida cave in central Crimea. These results are consistent with data on the composition of land vertebrates from the Taurida locality. The studied spectrum demonstrates similarity with the spore–pollen assemblage of the Berezan horizon of Ukraine with a maximum age of about 1.8 Ma. Based on the abundance of trichomes and plant fibers similar to those of Ficus carica Linnaeus, 1753 in the coprolites, it is assumed that the extinct hyenas Pachycrocuta brevirostris (Gervais, 1850) ate fig fruits in certain seasons.
{"title":"Early Pleistocene Vegetation and Environments near Taurida Cave (Central Crimea) on the Basis of Microphytofossil Data","authors":"D. A. Lopatina, O. G. Zanina, A. V. Lopatin","doi":"10.1134/s1028334x24603262","DOIUrl":"https://doi.org/10.1134/s1028334x24603262","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>The existence of vegetation of open environments with a predominance of grass–forb meadow associations and the participation of pine–oak forests was reconstructed on the basis of study of microphytofossils from the Lower Pleistocene deposits of the Taurida cave in central Crimea. These results are consistent with data on the composition of land vertebrates from the Taurida locality. The studied spectrum demonstrates similarity with the spore–pollen assemblage of the Berezan horizon of Ukraine with a maximum age of about 1.8 Ma. Based on the abundance of trichomes and plant fibers similar to those of <i>Ficus carica</i> Linnaeus, 1753 in the coprolites, it is assumed that the extinct hyenas <i>Pachycrocuta brevirostris</i> (Gervais, 1850) ate fig fruits in certain seasons.</p>","PeriodicalId":11352,"journal":{"name":"Doklady Earth Sciences","volume":"9 1","pages":""},"PeriodicalIF":0.9,"publicationDate":"2024-09-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142189632","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-09-04DOI: 10.1134/s1028334x2460275x
V. V. Abashev, D. V. Metelkin, A. A. Eliseev, V. A. Vernikovsky, N. E. Mikhaltsov, E. V. Vinogradov
Abstract
Data on the absolute value of the geomagnetic field intensity at the beginning of the Cretaceous Normal Superchron (C34n) was obtained from basalts of Hooker Island of the Franz Josef Land archipelago (FJL). These basalts are considered as one of the manifestations of the High Arctic Large Igneous Province. The record of the ancient geomagnetic field in the studied Early Cretaceous basalts was preserved well due to the presence of pseudo-single domain grains of primary magmatic titanomagnetite. The paleointensity, obtained by the Thellier–Coe method, satisfies the generally accepted reliability criteria, taking into consideration other necessary evidence. This information indicates that 125 Ma, during the formation of the FJL traps, the intensity of the geomagnetic field was four times lower than today. Our estimates show that the mean value of the virtual dipole moment was 1.7 × 1022 Am2. These results support the views about the low paleointensity at the Barremian–Aptian boundary and indicate a correlation between the intensity of the geomagnetic field, the frequency of reversals, and the formation of mantle plumes.
{"title":"The Early Cretaceous Absolute Geomagnetic Paleointensity Based on Results for Traps of the Franz Josef Land Archipelago","authors":"V. V. Abashev, D. V. Metelkin, A. A. Eliseev, V. A. Vernikovsky, N. E. Mikhaltsov, E. V. Vinogradov","doi":"10.1134/s1028334x2460275x","DOIUrl":"https://doi.org/10.1134/s1028334x2460275x","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>Data on the absolute value of the geomagnetic field intensity at the beginning of the Cretaceous Normal Superchron (C34n) was obtained from basalts of Hooker Island of the Franz Josef Land archipelago (FJL). These basalts are considered as one of the manifestations of the High Arctic Large Igneous Province. The record of the ancient geomagnetic field in the studied Early Cretaceous basalts was preserved well due to the presence of pseudo-single domain grains of primary magmatic titanomagnetite. The paleointensity, obtained by the Thellier–Coe method, satisfies the generally accepted reliability criteria, taking into consideration other necessary evidence. This information indicates that 125 Ma, during the formation of the FJL traps, the intensity of the geomagnetic field was four times lower than today. Our estimates show that the mean value of the virtual dipole moment was 1.7 × 10<sup>22</sup> Am<sup>2</sup>. These results support the views about the low paleointensity at the Barremian–Aptian boundary and indicate a correlation between the intensity of the geomagnetic field, the frequency of reversals, and the formation of mantle plumes.</p>","PeriodicalId":11352,"journal":{"name":"Doklady Earth Sciences","volume":"10 1","pages":""},"PeriodicalIF":0.9,"publicationDate":"2024-09-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142189627","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-09-04DOI: 10.1134/s1028334x24603535
G. A. Palyanova, S. N. Rychagov, E. N. Svetova, T. N. Moroz, Yu. V. Seryotkin, E. I. Sandimirova, N. S. Bortnikov
Abstract
Samples of siliceous rocks of the Southern Kambalny Central Thermal Field (SKC) containing a unique ore mineralization were studied. Optical microscopy, scanning electron microscopy, X-ray microanalysis, X-ray diffraction, ICP-MS, and Raman spectroscopy were used in this study. High concentrations and a wide range of rare and rare-earth elements were found in siliceous rocks. Silicates (quartz, moganite, and opal-crystobalite/tridymite opal), oxides (hematite and anatase), hydroxides (goethite), carbonates (calcite with Fe and Mn impurities), sulfates (barite with Sr impurity and gypsum), sulfides (pyrite, marcasite, chalcopyrite, and chalcocite), phosphates (xenotime-Y, YPO4 with impurities of lanthanides, S, Ca, and As; berlinite, AlPO4 with the V impurity), and apatite were identified. Structures of anatase replacement by quartz often in association with pyrite were identified. The mineralization of SKC siliceous rocks reflects the physicochemical specificity of deep metal-bearing solutions.
摘要 对含有独特矿化物的南坎巴尔尼中央热田硅质岩样本进行了研究。研究中使用了光学显微镜、扫描电子显微镜、X 射线显微分析、X 射线衍射、ICP-MS 和拉曼光谱。在硅质岩中发现了高浓度和多种稀有稀土元素。硅酸盐（石英、莫甘石和蛋白石-闪长石/翠榴石蛋白石）、氧化物（赤铁矿和锐钛矿）、氢氧化物（网纹石）、碳酸盐（含铁和锰杂质的方解石）、硫酸盐（含 Sr 杂质的重晶石和石膏）、硫化物（黄铁矿、闪锌矿、黄铜矿和白钨矿）、磷酸盐（氙Y、含镧系元素、S、Ca 和 As 杂质的 YPO4；和磷灰石。发现了锐钛矿被石英置换的结构，通常与黄铁矿伴生。SKC 硅质岩的矿化反映了深层含金属溶液的物理化学特异性。
{"title":"Unusual Ore Mineralization of Siliceous Rocks in the Southern Kambalny Central Thermal Field (Kamchatka)","authors":"G. A. Palyanova, S. N. Rychagov, E. N. Svetova, T. N. Moroz, Yu. V. Seryotkin, E. I. Sandimirova, N. S. Bortnikov","doi":"10.1134/s1028334x24603535","DOIUrl":"https://doi.org/10.1134/s1028334x24603535","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>Samples of siliceous rocks of the Southern Kambalny Central Thermal Field (SKC) containing a unique ore mineralization were studied. Optical microscopy, scanning electron microscopy, X-ray microanalysis, X-ray diffraction, ICP-MS, and Raman spectroscopy were used in this study. High concentrations and a wide range of rare and rare-earth elements were found in siliceous rocks. Silicates (quartz, moganite, and opal-crystobalite/tridymite opal), oxides (hematite and anatase), hydroxides (goethite), carbonates (calcite with Fe and Mn impurities), sulfates (barite with Sr impurity and gypsum), sulfides (pyrite, marcasite, chalcopyrite, and chalcocite), phosphates (xenotime-Y, YPO<sub>4</sub> with impurities of lanthanides, S, Ca, and As; berlinite, AlPO<sub>4</sub> with the V impurity), and apatite were identified. Structures of anatase replacement by quartz often in association with pyrite were identified. The mineralization of SKC siliceous rocks reflects the physicochemical specificity of deep metal-bearing solutions.</p>","PeriodicalId":11352,"journal":{"name":"Doklady Earth Sciences","volume":"30 1","pages":""},"PeriodicalIF":0.9,"publicationDate":"2024-09-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142189629","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-09-04DOI: 10.1134/s1028334x24603213
V. V. Adushkin, A. N. Besedina, G. G. Kocharyan, I. E. Semenova, S. A. Zhukova, O. G. Zhuravleva
Abstract
It is proposed in this paper to use the focal characteristics of small seismic events, in particular, the scaled energy and the rupture propagation velocity, as indicators of possible dynamic movements along a fault. The two sites selected for analysis underwent microseismic events induced by mining operations. The first site, the Korobkovskoe iron ore deposit of the Kursk Magnetic Anomaly, is located in the aseismic region. The second site, the apatite–nepheline deposit of the Khibiny massif, is characterized by relatively intensive natural and human-triggered seismicity. Based on the results of the analysis, the values of the scaled seismic energy and the rupture propagation velocity are drastically different at the deposits under consideration. At the apatite–nepheline ore deposit, the parameter values are close to the range of values characteristic for “normal” earthquakes. At the KMA deposit, the obtained anomalously low values of the scaled energy and the rupture propagation velocity correspond to “slow” earthquakes. The results obtained are indicative of the prospects for using the selected parameters as indicators of possible large dynamic events at the studied site of the fault zone.
{"title":"A New Approach to Hazard Control of Human-Triggered Earthquakes near Mining Facilities","authors":"V. V. Adushkin, A. N. Besedina, G. G. Kocharyan, I. E. Semenova, S. A. Zhukova, O. G. Zhuravleva","doi":"10.1134/s1028334x24603213","DOIUrl":"https://doi.org/10.1134/s1028334x24603213","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>It is proposed in this paper to use the focal characteristics of small seismic events, in particular, the scaled energy and the rupture propagation velocity, as indicators of possible dynamic movements along a fault. The two sites selected for analysis underwent microseismic events induced by mining operations. The first site, the Korobkovskoe iron ore deposit of the Kursk Magnetic Anomaly, is located in the aseismic region. The second site, the apatite–nepheline deposit of the Khibiny massif, is characterized by relatively intensive natural and human-triggered seismicity. Based on the results of the analysis, the values of the scaled seismic energy and the rupture propagation velocity are drastically different at the deposits under consideration. At the apatite–nepheline ore deposit, the parameter values are close to the range of values characteristic for “normal” earthquakes. At the KMA deposit, the obtained anomalously low values of the scaled energy and the rupture propagation velocity correspond to “slow” earthquakes. The results obtained are indicative of the prospects for using the selected parameters as indicators of possible large dynamic events at the studied site of the fault zone.</p>","PeriodicalId":11352,"journal":{"name":"Doklady Earth Sciences","volume":"65 1","pages":""},"PeriodicalIF":0.9,"publicationDate":"2024-09-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142189630","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-08-11DOI: 10.1134/s1028334x24601536
Maryam Moshgelgosha, Ahmad Zamani, Vahid Ahmadi, Kouros Yazdjerdi
Abstract
The Zagros Fold and Thrust Belt (ZFB) in southwestern Iran emerges as a geological marvel, defined by series of compact anticlines and synclines that the NW–SE trending structures of the Zagros belt. This unique configuration designates the ZFB as the dynamic boundary of the Arabian platform, shaped by the forces of nature. Over time, sedimentation in the expansive basin led to a gradual transformation, with folds originally oriented differently nowfolds axial line inclining southwestward, revealing a progressive shift in fold axial planes. This article presents a pioneering tectono-stratigraphic examination of Miocene Formations in the Fars and Bandar Abbas Hinterland, Southern Iran. The study meticulously explores five locations—Bastak, Taghdis-e Bahar, Dasht-e Arzhan, Saedi Mountain, and Yasuj—analyzing stratigraphic sections of the Miocene Formation. The Isopach map exposes variations in Miocene Formation thicknesses across these sites. In the Arjan plain, significant facies change unfolds, transitioning from Gachsaran Formation’s evaporitic sedimentary rocks to Rzak Formation’s marine sedimentary rocks and Asmari Formation’s calcareous rocks along a northwest–southwest border. These facies change correlates intricately with subtle movements of fault zones—Kareh–Bas, Sabzpooshan, Sarvestan, and Kazerun. The tectono-stratigraphic journey unveils a profound connection between changes in sedimentary basin depth and nuanced alterations in sedimentary rocks’ facies, orchestrated by the interplay of various basement faults, some following the Arabian trend, others aligning with the majestic Zagros trend—a symphony of geological forces shaping the Miocene narrative in the Fars and Bandar Abbas Hinterland.
{"title":"A Comprehensive Analysis of Basement Faults in Miocene Deposits: Fars and Bandar Abbas Perspectives","authors":"Maryam Moshgelgosha, Ahmad Zamani, Vahid Ahmadi, Kouros Yazdjerdi","doi":"10.1134/s1028334x24601536","DOIUrl":"https://doi.org/10.1134/s1028334x24601536","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>The Zagros Fold and Thrust Belt (ZFB) in southwestern Iran emerges as a geological marvel, defined by series of compact anticlines and synclines that the NW–SE trending structures of the Zagros belt. This unique configuration designates the ZFB as the dynamic boundary of the Arabian platform, shaped by the forces of nature. Over time, sedimentation in the expansive basin led to a gradual transformation, with folds originally oriented differently nowfolds axial line inclining southwestward, revealing a progressive shift in fold axial planes. This article presents a pioneering tectono-stratigraphic examination of Miocene Formations in the Fars and Bandar Abbas Hinterland, Southern Iran. The study meticulously explores five locations—Bastak, Taghdis-e Bahar, Dasht-e Arzhan, Saedi Mountain, and Yasuj—analyzing stratigraphic sections of the Miocene Formation. The Isopach map exposes variations in Miocene Formation thicknesses across these sites. In the Arjan plain, significant facies change unfolds, transitioning from Gachsaran Formation’s evaporitic sedimentary rocks to Rzak Formation’s marine sedimentary rocks and Asmari Formation’s calcareous rocks along a northwest–southwest border. These facies change correlates intricately with subtle movements of fault zones—Kareh–Bas, Sabzpooshan, Sarvestan, and Kazerun. The tectono-stratigraphic journey unveils a profound connection between changes in sedimentary basin depth and nuanced alterations in sedimentary rocks’ facies, orchestrated by the interplay of various basement faults, some following the Arabian trend, others aligning with the majestic Zagros trend—a symphony of geological forces shaping the Miocene narrative in the Fars and Bandar Abbas Hinterland.</p>","PeriodicalId":11352,"journal":{"name":"Doklady Earth Sciences","volume":"56 1","pages":""},"PeriodicalIF":0.9,"publicationDate":"2024-08-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141948947","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-08-11DOI: 10.1134/s1028334x24602840
V. A. Rumyantsev, J. V. Puhalsky, S. I. Loskutov, A. I. Shaposhnikov, O. A. Rumyantseva, Yu. V. Kosulnikov, A. I. Kovalchuk, L. A. Gorodnova, G. V. Nikiticheva, A. S. Mityukov
Abstract
The biochemical composition of sapropels from Maloe Simaginskoe Lake, which were studied using modern methods of atomic emission spectrometry (ICP-AE) and high-performance liquid chromatography (HPLC), is presented. This source of organic matter is now the least in demand in the country; many deposits have been abandoned. However, such organic colloids and their humic extracts are not inferior in their spectrum of action to extracts from peat or coal. The predominance of the proportion of potassium and sodium in the gross composition of macroelements is shown. Among microelements, both in bulk and in mobile forms, iron and manganese ions dominated. Apparently, the Fe cation is bound in polyligand forms with carboxylic acids. The ratio of these two elements in the samples averaged 10 : 1—Fe : Mn. The content of heavy metals was within the limits acceptable for sapropel fertilizers according to GOST R 54000-2010. The results obtained during this study can be used further in the biotechnology of intensive crop production, when growing crops in a hydroponic environment while minimizing the use of synthetic fertilizers. In addition, since carbohydrates were found in all samples of the raw materials studied, the extracts can be used to develop modified nutrient media in agricultural microbiology to stabilize the titer of beneficial rhizobacteria.
{"title":"Biochemical Assessment of Humate-Sapropel Raw Materials of Maloe Simaginskoe Lake","authors":"V. A. Rumyantsev, J. V. Puhalsky, S. I. Loskutov, A. I. Shaposhnikov, O. A. Rumyantseva, Yu. V. Kosulnikov, A. I. Kovalchuk, L. A. Gorodnova, G. V. Nikiticheva, A. S. Mityukov","doi":"10.1134/s1028334x24602840","DOIUrl":"https://doi.org/10.1134/s1028334x24602840","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>The biochemical composition of sapropels from Maloe Simaginskoe Lake, which were studied using modern methods of atomic emission spectrometry (ICP-AE) and high-performance liquid chromatography (HPLC), is presented. This source of organic matter is now the least in demand in the country; many deposits have been abandoned. However, such organic colloids and their humic extracts are not inferior in their spectrum of action to extracts from peat or coal. The predominance of the proportion of potassium and sodium in the gross composition of macroelements is shown. Among microelements, both in bulk and in mobile forms, iron and manganese ions dominated. Apparently, the Fe cation is bound in polyligand forms with carboxylic acids. The ratio of these two elements in the samples averaged 10 : 1—Fe : Mn. The content of heavy metals was within the limits acceptable for sapropel fertilizers according to GOST R 54000-2010. The results obtained during this study can be used further in the biotechnology of intensive crop production, when growing crops in a hydroponic environment while minimizing the use of synthetic fertilizers. In addition, since carbohydrates were found in all samples of the raw materials studied, the extracts can be used to develop modified nutrient media in agricultural microbiology to stabilize the titer of beneficial rhizobacteria.</p>","PeriodicalId":11352,"journal":{"name":"Doklady Earth Sciences","volume":"4 1","pages":""},"PeriodicalIF":0.9,"publicationDate":"2024-08-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141969828","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-08-11DOI: 10.1134/s1028334x24601846
Ruonan Zhao, A. V. Zhabko, Weijie Liu, Chuang Chen
Abstract
Accurate monitoring of mining three-dimensional deformation plays an important role in analyzing the subsidence mechanism and assessing potential geological hazards in the mining area. This paper combines TerraSAR-X and RADARSAT-2 heterogeneous SAR images employing MSBAS technology to obtain the three-dimensional time-series of deformation of the 132 610 working face in the Fengfeng mine from December 2015 to February 2016. The monitoring results show that the maximum surface subsidence and the subsidence rate during the monitoring period were –243 mm and 4.42 mm/day, and the maximum east-west horizontal movement was –80~30 mm. The surface subsidence basin is in the active stage, which is prone to pose a threat to the safety of the surrounding structures. Comparison with the leveling data shows that the root-mean-square deviation of the vertical deformation obtained by MSBAS technology is 10.7 mm, and the accuracy can reach the centimeter level. Meanwhile, based on the vertical deformation obtained by MSBAS technology, combined with the proportionality relationship between horizontal movement and tilt, the north-south horizontal movement was estimated as –80~70 mm, which provided a solution for obtaining the north-south horizontal movement of the mining area by InSAR. Analysis of the three-dimensional time-series of the surface deformation at the main sections shows that the surface deformation features during the mining process of the 132610 working face match well with the general model of mining subsidence, but the working face inclination angle has an influence on the surface deformation.
{"title":"Monitoring and Analysis of Surface Three-dimensional Deformation of Mining Area based on MSBAS Technology and Mining Subsidence Model","authors":"Ruonan Zhao, A. V. Zhabko, Weijie Liu, Chuang Chen","doi":"10.1134/s1028334x24601846","DOIUrl":"https://doi.org/10.1134/s1028334x24601846","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>Accurate monitoring of mining three-dimensional deformation plays an important role in analyzing the subsidence mechanism and assessing potential geological hazards in the mining area. This paper combines TerraSAR-X and RADARSAT-2 heterogeneous SAR images employing MSBAS technology to obtain the three-dimensional time-series of deformation of the 132 610 working face in the Fengfeng mine from December 2015 to February 2016. The monitoring results show that the maximum surface subsidence and the subsidence rate during the monitoring period were –243 mm and 4.42 mm/day, and the maximum east-west horizontal movement was –80~30 mm. The surface subsidence basin is in the active stage, which is prone to pose a threat to the safety of the surrounding structures. Comparison with the leveling data shows that the root-mean-square deviation of the vertical deformation obtained by MSBAS technology is 10.7 mm, and the accuracy can reach the centimeter level. Meanwhile, based on the vertical deformation obtained by MSBAS technology, combined with the proportionality relationship between horizontal movement and tilt, the north-south horizontal movement was estimated as –80~70 mm, which provided a solution for obtaining the north-south horizontal movement of the mining area by InSAR. Analysis of the three-dimensional time-series of the surface deformation at the main sections shows that the surface deformation features during the mining process of the 132610 working face match well with the general model of mining subsidence, but the working face inclination angle has an influence on the surface deformation.</p>","PeriodicalId":11352,"journal":{"name":"Doklady Earth Sciences","volume":"6 1","pages":""},"PeriodicalIF":0.9,"publicationDate":"2024-08-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141948940","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-08-11DOI: 10.1134/s1028334x24602815
Yu. N. Morgunov, A. A. Golov
Abstract
The results of an experiment conducted in the Sea of Japan in August 2023 on an acoustic path with a length of 144.4 km under summer–fall hydrological conditions are discussed. The case of the propagation of pseudorandom pulse signals from an extended shelf into the deep sea upon reception at depths of 69, 126, 680, and 914 m is examined. The analysis of the experimentally obtained pulse characteristics has shown that a group of ray arrivals with a duration of approximately 0.5 s, with the maximum in the center, is recorded at all depths. The experiment on reception of broadband pulse signals with a central frequency of 400 Hz has been conducted at a distance of 144.4 km from the source of navigation signals (SNSs) located on the shelf at a depth of 30 m and a sea depth of 45 m. Signal information has been received using a system equipped with hydrophones distributed up to a depth of 1000 m, enabling long-term signal recording at fixed depths or during submersion. The experimental findings have made it possible to study pulse characteristics of the acoustic waveguide, to calculate the effective propagation velocities of signals received at different depths, and to conclude about the potential of using measuring autonomous underwater vehicles (AUVs) at depths up to 1000 m to solve the problems of climate monitoring of marine areas.
{"title":"Propagation Features of Pseudorandom Pulse Signals from an Extended Shelf into the Deep Sea upon Reception at Different Depths","authors":"Yu. N. Morgunov, A. A. Golov","doi":"10.1134/s1028334x24602815","DOIUrl":"https://doi.org/10.1134/s1028334x24602815","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>The results of an experiment conducted in the Sea of Japan in August 2023 on an acoustic path with a length of 144.4 km under summer–fall hydrological conditions are discussed. The case of the propagation of pseudorandom pulse signals from an extended shelf into the deep sea upon reception at depths of 69, 126, 680, and 914 m is examined. The analysis of the experimentally obtained pulse characteristics has shown that a group of ray arrivals with a duration of approximately 0.5 s, with the maximum in the center, is recorded at all depths. The experiment on reception of broadband pulse signals with a central frequency of 400 Hz has been conducted at a distance of 144.4 km from the source of navigation signals (SNSs) located on the shelf at a depth of 30 m and a sea depth of 45 m. Signal information has been received using a system equipped with hydrophones distributed up to a depth of 1000 m, enabling long-term signal recording at fixed depths or during submersion. The experimental findings have made it possible to study pulse characteristics of the acoustic waveguide, to calculate the effective propagation velocities of signals received at different depths, and to conclude about the potential of using measuring autonomous underwater vehicles (AUVs) at depths up to 1000 m to solve the problems of climate monitoring of marine areas.</p>","PeriodicalId":11352,"journal":{"name":"Doklady Earth Sciences","volume":"73 1","pages":""},"PeriodicalIF":0.9,"publicationDate":"2024-08-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141948948","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-08-11DOI: 10.1134/s1028334x24602542
A. V. Kolesnikov, V. A. Pan’kova, V. N. Pan’kov, V. D. Desiatkin, I. V. Latysheva, A. V. Shatsillo, N. B. Kuznetsov, T. V. Romanyuk
Abstract
The complex body-trace fossils of Vendian soft-bodied biota have been found for the first time in the Central Urals during the study of the Vilukha and Sinii Kamen members of the Chernyi Kamen Formation of the Upper Vendian Sylvitsa Group (Kos’va River area, Perm Krai of Russia). These sedimentary sequences were exposed along the valley of the Shirokovskii Reservoir. Among the fossils, the chuariomorpha-like species Beltanelliformis konovalovi, previously described from the Konovalovka Member of the Chernyi Kamen Formation, was identified. However, the morphological analysis of the new fossil material revealed a number of principal differences from representatives of the genus Beltanelliformis Menner, 1974. It was shown that the taxon B. konovalovi, most likely, does not belong to this genus and probably needs further revision, and, in turn, the fossil locality at the Shirokovskii Reservoir allows us to establish a new area with fossils of the Precambrian mobile organisms.
摘 要 在对上文登西尔维察组切尔尼卡门地层（Chernyi Kamen Formation of the Upper Vendian Sylvitsa Group，俄罗斯彼尔姆边疆区科斯瓦河地区）的维卢卡和西尼卡门层（Vilukha and Sinii Kamen member）进行研究期间，首次在中乌拉尔地区发现了文登软体生物群的复杂体迹化石。这些沉积层沿希罗科夫斯基水库河谷出露。在这些化石中，发现了之前在切尔尼卡门地层 Konovalovka 组中描述过的蝶形目 Beltanelliformis konovalovi。然而，对新化石材料的形态分析表明，它与门纳（Menner）1974 年发现的 Beltanelliformis 属的代表物种存在许多主要差异。结果表明，B. konovalovi 分类群很可能不属于该属，可能需要进一步修订，而 Shirokovskii 水库的化石地点则使我们能够建立一个拥有前寒武纪移动生物化石的新区域。
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Pub Date : 2024-08-11DOI: 10.1134/s1028334x24601998
S. G. Soloviev, S. G. Kryazhev, D. V. Semenova, Y. A. Kalinin, N. S. Bortnikov
Abstract
The paper presents first data on isotopic U–Pb study (LA-ICP-MS method) of zircon from intrusive rocks of the Kensu pluton situated in the eastern part of the deep-seated fault system of the “Nikolaev Line.” This pluton of high-potassic (shoshonitic series) rocks is accompanied by the Kensu deposit and other occurrences of skarn and porphyry W–Mo–Cu–Au mineralization. Together with the other Au, W, and Cu deposits and occurrences, they are parts of the extended metallogenic belt of Tien Shan. The concordant isotopic U–Pb age data for zircon autocrysts from the rocks of the consecutive intrusive phases span over the interval of approximately 325 to 302 Ma. This interval comprised the crystallization of monzogabbro (321 ± 4 Ma), monzonite (319 ± 4 Ma), camptonite (306 ± 4 Ma), syenite (307 ± 6 Ma), quartz syenite (305.5 ± 2 Ma), and quartz monzonite (305 ± 3 Ma). Zircon antecrysts dated at 316–325 Ma to 335–345 Ma have also been identified. The age data obtained are consistent with the age of subduction processes defined for the western part of the Middle Tien Shan. However, both geochemical characteristics of the rocks from the Kensu pluton and a distinct W–Mo mineralization related to this pluton contradict the subduction-related setting of the pluton emplacement but, instead, point out the post-collisional setting of the intrusion emplacement. This discrepancy can be explained by a “scissor-like” (from east to west) closure of the Turkestan paleoocean that has resulted in the post-collisional regime in the eastern part of the “Nikolaev Line,” whereas subduction continued in its western part. The rocks also contain zircon xenocrysts with a much older age (in to order of 1.9 Gb) that probably represents the age of the Tarim craton basement rocks; this indicates an involvement of the ancient material in the magma generation.
{"title":"Post-collisional W‒Mo‒Cu‒Au Mineralization in the Middle Tien Shan: First Data on U–Pb Isotope Dating (LA-ICP-MS) of Zircon from Intrusive Rocks of the Kensu Pluton (Eastern Kyrgyzstan)","authors":"S. G. Soloviev, S. G. Kryazhev, D. V. Semenova, Y. A. Kalinin, N. S. Bortnikov","doi":"10.1134/s1028334x24601998","DOIUrl":"https://doi.org/10.1134/s1028334x24601998","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>The paper presents first data on isotopic U–Pb study (LA-ICP-MS method) of zircon from intrusive rocks of the Kensu pluton situated in the eastern part of the deep-seated fault system of the “Nikolaev Line.” This pluton of high-potassic (shoshonitic series) rocks is accompanied by the Kensu deposit and other occurrences of skarn and porphyry W–Mo–Cu–Au mineralization. Together with the other Au, W, and Cu deposits and occurrences, they are parts of the extended metallogenic belt of Tien Shan. The concordant isotopic U–Pb age data for zircon autocrysts from the rocks of the consecutive intrusive phases span over the interval of approximately 325 to 302 Ma. This interval comprised the crystallization of monzogabbro (321 ± 4 Ma), monzonite (319 ± 4 Ma), camptonite (306 ± 4 Ma), syenite (307 ± 6 Ma), quartz syenite (305.5 ± 2 Ma), and quartz monzonite (305 ± 3 Ma). Zircon antecrysts dated at 316–325 Ma to 335–345 Ma have also been identified. The age data obtained are consistent with the age of subduction processes defined for the western part of the Middle Tien Shan. However, both geochemical characteristics of the rocks from the Kensu pluton and a distinct W–Mo mineralization related to this pluton contradict the subduction-related setting of the pluton emplacement but, instead, point out the post-collisional setting of the intrusion emplacement. This discrepancy can be explained by a “scissor-like” (from east to west) closure of the Turkestan paleoocean that has resulted in the post-collisional regime in the eastern part of the “Nikolaev Line,” whereas subduction continued in its western part. The rocks also contain zircon xenocrysts with a much older age (in to order of 1.9 Gb) that probably represents the age of the Tarim craton basement rocks; this indicates an involvement of the ancient material in the magma generation. </p>","PeriodicalId":11352,"journal":{"name":"Doklady Earth Sciences","volume":"73 1","pages":""},"PeriodicalIF":0.9,"publicationDate":"2024-08-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141948938","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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