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Variational Algorithms of Deep Kinematic Migration in Two-Dimensional Media with a Horizontal Velocity Gradient 具有水平速度梯度的二维介质中深层运动迁移的变量算法
IF 0.4
Moscow University Geology Bulletin Pub Date : 2024-07-17 DOI: 10.3103/s0145875224700327
P. Yu. Stepanov, Yu. A. Gomanyuk
{"title":"Variational Algorithms of Deep Kinematic Migration in Two-Dimensional Media with a Horizontal Velocity Gradient","authors":"P. Yu. Stepanov, Yu. A. Gomanyuk","doi":"10.3103/s0145875224700327","DOIUrl":"https://doi.org/10.3103/s0145875224700327","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>The paper considers three algorithms of kinematic migration (conversion of time fields of normal rays into reflecting boundaries) based on the variational theory of ray tracing developed by T.I. Oblogina, prof. of the Department of Seismometry and Geoacoustics, Faculty of Geology, Moscow State University. Numerical experiments with theoretical models of layered media of varying complexity have revealed significant drawbacks of the “classical” variational algorithm for solving the inverse kinematic problem. Two modifications of the classical variational algorithm are suggested in terms of calculating the starting angle of the ray departure from the Earth’s surface, leaving unchanged the principle of taking into account the curvature of seismic rays and refraction at intermediate boundaries: a variational algorithm which uses “image rays” and a kinematic migration algorithm for layered media with variable reservoir velocities, which takes into account the slope of each boundary. The results obtained for theoretical models of complex media show high efficiency of the modified kinematic migration algorithm which takes into account the slope of each boundary when solving the inverse kinematic problem.</p>","PeriodicalId":44391,"journal":{"name":"Moscow University Geology Bulletin","volume":null,"pages":null},"PeriodicalIF":0.4,"publicationDate":"2024-07-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141745978","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}
引用次数: 0
Experimental Evaluation of the Peatification Effect on the Phase Composition of Water in Frozen Soils of with Different Grain Size Distributions 泥炭化效应对不同粒度分布冻土中水相组成的实验评估
IF 0.4
Moscow University Geology Bulletin Pub Date : 2024-07-17 DOI: 10.3103/s0145875224700303
R. G. Motenko, R. R. Davletova, E. S. Grechishcheva, A. G. Alekseev
{"title":"Experimental Evaluation of the Peatification Effect on the Phase Composition of Water in Frozen Soils of with Different Grain Size Distributions","authors":"R. G. Motenko, R. R. Davletova, E. S. Grechishcheva, A. G. Alekseev","doi":"10.3103/s0145875224700303","DOIUrl":"https://doi.org/10.3103/s0145875224700303","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>The article presents the results of experimental studies of the unfrozen water content (<i>W</i><sub>w</sub>) in frozen soils with different grain size distributions with a degree of peatification from 3 to 100% (in increments of 10%). The obtained patterns <i>W</i><sub>w</sub> = <i>f</i>(<i>t</i> °C) are discussed. The role of the organic matter content in the formation of the phase composition of moisture in the temperature range from 0 to –18°C is estimated. The study primarily considers the patterns of moisture changes due to unfrozen water with a degree of peatification above 50%, when soils are referred to peat according to GOST 25 100–2020. The patterns of the change in <i>W</i><sub>w</sub> from the degree of peatification at fixed temperatures are given.</p>","PeriodicalId":44391,"journal":{"name":"Moscow University Geology Bulletin","volume":null,"pages":null},"PeriodicalIF":0.4,"publicationDate":"2024-07-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141739449","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}
引用次数: 0
Assessment of Transmissivity of the Weathered Upper Part of Horizontally Layered Bedrock 水平层状基岩风化上部透射率评估
IF 0.4
Moscow University Geology Bulletin Pub Date : 2024-07-17 DOI: 10.3103/s0145875224700297
A. V. Lekhov
{"title":"Assessment of Transmissivity of the Weathered Upper Part of Horizontally Layered Bedrock","authors":"A. V. Lekhov","doi":"10.3103/s0145875224700297","DOIUrl":"https://doi.org/10.3103/s0145875224700297","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>The results of flowmeter tests of wells in the upper part of a layered rock massif indicate a model of the permeability medium in the form of separate horizontal thin fracture zones, separated by layers with a thickness of several meters. Pumping was studied with a model in cylindrical coordinates for two thin aquifers. The upper one works with a constant pressure in pumping a well, determined by the position of the zone, and a decreasing rate, and the lower, with an increasing rate, is additional to the pump rate. The filter intervals of the central and the only observation well are the same. Processing of the pumping results with the commonly used Jacob method showed the main features: strong differences in transmissivity in different variants of well locations, unrealistically large values of the storage coefficient, and an ultrasmall calculated radius of the pumping well.</p>","PeriodicalId":44391,"journal":{"name":"Moscow University Geology Bulletin","volume":null,"pages":null},"PeriodicalIF":0.4,"publicationDate":"2024-07-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141739447","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}
引用次数: 0
Paleoclimatic and Paleogeographic Reconstructions of Sedimentation Conditions in the Fushun Basin Using Methods of Mathematical Statistics 用数理统计方法重建抚顺盆地的古气候和古地理沉积条件
IF 0.4
Moscow University Geology Bulletin Pub Date : 2024-07-17 DOI: 10.3103/s014587522470025x
K. V. Syromyatnikov, M. A. Levitan, R. R. Gabdullin
{"title":"Paleoclimatic and Paleogeographic Reconstructions of Sedimentation Conditions in the Fushun Basin Using Methods of Mathematical Statistics","authors":"K. V. Syromyatnikov, M. A. Levitan, R. R. Gabdullin","doi":"10.3103/s014587522470025x","DOIUrl":"https://doi.org/10.3103/s014587522470025x","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>The relationship between climate changes and sedimentation conditions for four accumulation stages of the Fuxing and Shahai coal-bearing formations of the Fushun coal basin in the Aptian–Albian has been established using mathematical statistical methods. As a result, it has been revealed that the increase in climate humidity coincided with the widespread anoxic oceanic Paquie event (Paquie, OAE1b) in the Early Albian. In addition, a significant effect of facies conditions on the intensity of accumulation of peat and coal of the Fuxing and Shahai coal-bearing formations has been revealed. The activation of peat accumulation and coal formation processes was promoted by an increase in climate humidity, an activation of input of clastic material, and a decrease in water level in freshwater reservoirs of the Fuxing basin.</p>","PeriodicalId":44391,"journal":{"name":"Moscow University Geology Bulletin","volume":null,"pages":null},"PeriodicalIF":0.4,"publicationDate":"2024-07-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141739724","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}
引用次数: 0
Radioactivity of Surface Marine Sediments of Chaun Bay: Analysis of Natural and Anthropogenic Factors 潮安湾表层海洋沉积物的放射性：自然和人为因素分析
IF 0.4
Moscow University Geology Bulletin Pub Date : 2024-06-05 DOI: 10.3103/s0145875224700078
A. S. Ulyantsev, S. I. Ivannikov, S. Yu. Bratskaya, A. N. Charkin
{"title":"Radioactivity of Surface Marine Sediments of Chaun Bay: Analysis of Natural and Anthropogenic Factors","authors":"A. S. Ulyantsev, S. I. Ivannikov, S. Yu. Bratskaya, A. N. Charkin","doi":"10.3103/s0145875224700078","DOIUrl":"https://doi.org/10.3103/s0145875224700078","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>The paper presents data on the spatial distribution of the active concentration of natural (<sup>232</sup>Th, <sup>226</sup>Ra, and <sup>40</sup>K) and anthropogenic (<sup>137</sup>Cs) radionuclides in the surface layer of bottom sediments in Chaun Bay of the East Siberian Sea. The measured active concentration of <sup>232</sup>Th and <sup>226</sup>Ra was typical of bottom sediments of the Arctic coastal shelf zone and corresponded to the global level. The level of <sup>137</sup>Cs activity in bottom sediments showed the absence of local sources of anthropogenic pollution in Chaun Bay, while the mean <sup>40</sup>K activity concentration was 1.8 times higher than the global. The results of statistical analysis of the data obtained showed that the dynamics of river runoff, thermal abrasion, and currents, as well as aeolian and ice transport of sedimentary matter, were the main factors that determined the differences in the behavior of the studied radionuclides in the surface bottom sediments of Chaun Bay.</p>","PeriodicalId":44391,"journal":{"name":"Moscow University Geology Bulletin","volume":null,"pages":null},"PeriodicalIF":0.4,"publicationDate":"2024-06-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141253183","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}
引用次数: 0
Mineral Composition and Stratigraphic Position of Interior Jewelry Ammonites from the Middle Aptian of the Republic of North Ossetia-Alania 北奥塞梯-阿拉尼亚共和国中古生代内部珠宝鲑鱼的矿物成分和地层位置
IF 0.4
Moscow University Geology Bulletin Pub Date : 2024-06-05 DOI: 10.3103/s0145875224700182
E. Yu. Baraboshkin, D. A. Petrochenkov
{"title":"Mineral Composition and Stratigraphic Position of Interior Jewelry Ammonites from the Middle Aptian of the Republic of North Ossetia-Alania","authors":"E. Yu. Baraboshkin, D. A. Petrochenkov","doi":"10.3103/s0145875224700182","DOIUrl":"https://doi.org/10.3103/s0145875224700182","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>The stratigraphic position and mineral composition of ammonite shells of interior and jewelry quality from the Republic of North Ossetia-Alania have been studied for the first time. Ammonites were collected from the middle reaches of the Urukh River and originated from middle Aptian sediments accumulated in anoxic environments. The set of ammonite studies included determination of microhardness, density, luminescence; optical–petrographic analysis; quantitative determination of chemical and mineral composition; and electron probe studies. Ammonites consist mainly of calcite, pyrite, and aragonite. The walls and septa of the shells retained the original aragonite composition. The residential and destroyed hydrostatic chambers of the shells are composed of marl. Micron inclusions of ankerite and apatite have been found from accessory minerals. Sr and Ni have been identified as impurities. The mineralization of the shells began with the formation of pyrite layers. The mineral composition of the ammonites is calcite–pyrite.</p>","PeriodicalId":44391,"journal":{"name":"Moscow University Geology Bulletin","volume":null,"pages":null},"PeriodicalIF":0.4,"publicationDate":"2024-06-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141253327","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}
引用次数: 0
Quantitative Parameters of Diagenetic Transformations in Eocene–Pleistocene Sediments of the Vøring Plateau (Norwegian Sea) Depending on Their Sedimentation Conditions 沃林高原（挪威海）始新世-始新世沉积物中二基因转化的定量参数取决于其沉积条件
IF 0.4
Moscow University Geology Bulletin Pub Date : 2024-06-05 DOI: 10.3103/s014587522470008x
K. V. Syromyatnikov, R. R. Gabdullin, M. A. Levitan
{"title":"Quantitative Parameters of Diagenetic Transformations in Eocene–Pleistocene Sediments of the Vøring Plateau (Norwegian Sea) Depending on Their Sedimentation Conditions","authors":"K. V. Syromyatnikov, R. R. Gabdullin, M. A. Levitan","doi":"10.3103/s014587522470008x","DOIUrl":"https://doi.org/10.3103/s014587522470008x","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>The degree of intensity of diagenetic transformations was studied using one-dimensional regressive analysis of the distribution of Fe, Mn, and C<sub>org</sub> contents, as well as the density of marine sediments along depth in the sections of the studied boreholes drilled on the Vøring Plateau. As a result, we estimated the qualitative parameters of diagenetic processes in the Eocene–Pleistocene sediments. On the basis of one-factor dispersion analysis, we also studied the degree of intensity of diagenetic processes for the main lithological types of sediments of the Vøring Plateau. It is established that, in addition to hiatuses and the influence of bottom currents and turbidites, the degree of diagenetic transformations in the Eocene–Pleistocene depended on the following main factors: sedimentation conditions, lithological composition of sediments, and the amount of organic carbon in composition of the Eocene–Pleistocene sediments of the Vøring Plateau.</p>","PeriodicalId":44391,"journal":{"name":"Moscow University Geology Bulletin","volume":null,"pages":null},"PeriodicalIF":0.4,"publicationDate":"2024-06-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141253335","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}
引用次数: 0
Diamonds of the Pionerskaya Pipe: Morphology, Spectroscopy, and Prospects 皮奥内尔斯卡娅管道的钻石：形态、光谱和前景
IF 0.4
Moscow University Geology Bulletin Pub Date : 2024-06-05 DOI: 10.3103/s0145875224700091
G. Yu. Kriulina, S. V. Vyatkin, L. D. Bardukhinov, E. M. Sedykh, M. B. Kopchikov, V. K. Garanin
{"title":"Diamonds of the Pionerskaya Pipe: Morphology, Spectroscopy, and Prospects","authors":"G. Yu. Kriulina, S. V. Vyatkin, L. D. Bardukhinov, E. M. Sedykh, M. B. Kopchikov, V. K. Garanin","doi":"10.3103/s0145875224700091","DOIUrl":"https://doi.org/10.3103/s0145875224700091","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>Compared to diamonds from the Arkhangelskaya and Karpinsky-1 pipes, diamonds from the Pionerskaya pipe formed at higher temperatures and were exposed to such conditions for a longer time (the underwent high-temperature annealing). The Pionerskaya pipe has a slightly lower productivity, but the quality of diamonds is higher, especially in large size classes. In addition, it has a higher proportion of octahedra and highly transparent crystals that were not subjected to accessory etching.</p>","PeriodicalId":44391,"journal":{"name":"Moscow University Geology Bulletin","volume":null,"pages":null},"PeriodicalIF":0.4,"publicationDate":"2024-06-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141253048","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}
引用次数: 0
The Upper Maastrichtian Reference Section of Mt. Klementyev, Southeastern Crimea 克里米亚东南部克莱门特耶夫山的上元古代参考剖面
IF 0.4
Moscow University Geology Bulletin Pub Date : 2024-06-05 DOI: 10.3103/s0145875224700030
L. F. Kopaevich, E. V. Yakovishina, N. O. Mitrofanova, A. M. Nikishin, S. I. Bordunov
{"title":"The Upper Maastrichtian Reference Section of Mt. Klementyev, Southeastern Crimea","authors":"L. F. Kopaevich, E. V. Yakovishina, N. O. Mitrofanova, A. M. Nikishin, S. I. Bordunov","doi":"10.3103/s0145875224700030","DOIUrl":"https://doi.org/10.3103/s0145875224700030","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>The results of a comprehensive study of an Upper Maastrichtian reference Mt. Klementyev section (Southeastern Crimea), consisting of a terrigenous–carbonate sequence, are presented. It is established that sedimentation occurred in relatively deep-sea conditions. Biostratigraphic analysis of assemblages of benthic and planktonic foraminifers made it possible to recognize the foraminiferal zones in the section and to confirm deep-sea sedimentation during this period.</p>","PeriodicalId":44391,"journal":{"name":"Moscow University Geology Bulletin","volume":null,"pages":null},"PeriodicalIF":0.4,"publicationDate":"2024-06-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141253076","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}
引用次数: 0
Platinum Group Minerals of the Baimka Gold Placer Cluster, Western Chukotka: New Data 楚科奇西部拜姆卡金矿床群的铂族矿物：新数据
IF 0.4
Moscow University Geology Bulletin Pub Date : 2024-06-05 DOI: 10.3103/s0145875224700108
E. A. Vlasov, A. G. Mochalov, M. F. Vigasina, V. D. Shcherbakov, P. Yu. Plechov
{"title":"Platinum Group Minerals of the Baimka Gold Placer Cluster, Western Chukotka: New Data","authors":"E. A. Vlasov, A. G. Mochalov, M. F. Vigasina, V. D. Shcherbakov, P. Yu. Plechov","doi":"10.3103/s0145875224700108","DOIUrl":"https://doi.org/10.3103/s0145875224700108","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>The results of the study of the platinum group minerals of the Baimka gold placer cluster, Western Chukotka, Russia, are presented. Platinum group minerals belong to the iridium–platinum and platinum mineralogical-geochemical types with the Late Jurassic cumulative pyroxenite-gabbro complexes as a probable source. Platinum group minerals came to alluvial gold placers primarily from intermediate reservoirs, which is the Volgian volcanic-sedimentary sequence J<sub>3</sub>v<sub>2–3</sub>. Rounded silicate glass inclusions are a specific feature of platinum minerals from the Baimka placer cluster.</p>","PeriodicalId":44391,"journal":{"name":"Moscow University Geology Bulletin","volume":null,"pages":null},"PeriodicalIF":0.4,"publicationDate":"2024-06-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141253072","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}
引用次数: 0
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