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Sedimentation Environments of the Lower Cretaceous Deposits of the North Caspian 北里海下白垩统矿床的沉积环境
IF 0.4
Moscow University Geology Bulletin Pub Date : 2024-07-17 DOI: 10.3103/s0145875224700273
V. V. Churkina, Yu. A. Kotochkova, G. A. Kalmykov
{"title":"Sedimentation Environments of the Lower Cretaceous Deposits of the North Caspian","authors":"V. V. Churkina, Yu. A. Kotochkova, G. A. Kalmykov","doi":"10.3103/s0145875224700273","DOIUrl":"https://doi.org/10.3103/s0145875224700273","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>The article describes the sedimentation environments of Lower Cretaceous (Aptian–Albian) terrigenous deposits in the North Caspian. These rocks are oil and gas reservoirs and are characterized by an uneven distribution of the pelitic and silty fractions, which leads to a high content of residual water, low permeability, and poor consistency of the filtration-capacity properties with each other. A detailed lithological and facies analysis of the rocks was carried out for correct interpretation of geophysical data. The following marine environments predominated in the studied area in the Early Cretaceous: coastal, shallow marine, relatively shallow shelf with active hydrodynamics; relatively deep-water shelf with low hydrodynamics. The sections show a change from shallow to deeper facies and vice versa, which allows us to conclude periodic fluctuations in sea level. The results of lithological analysis clearly indicate the predominance of shallow marine and coastal sediments in the Aptian and deeper, shelf sediments in the Albian. Thus, we can suggest a sea transgression at the end of the Early Cretaceous and detect signs of it in the sections of Aptian–Albian deposits in the North Caspian.</p>","PeriodicalId":44391,"journal":{"name":"Moscow University Geology Bulletin","volume":"52 1","pages":""},"PeriodicalIF":0.4,"publicationDate":"2024-07-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141739728","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
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":"58 1","pages":""},"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
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":"15 1","pages":""},"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":"61 1","pages":""},"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":"230 1","pages":""},"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
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":"41 1","pages":""},"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
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":"41 1","pages":""},"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":"32 1","pages":""},"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
High-Precision Cyclic Correlation as a Basis for Detailed Paleoclimatic Reconstructions for Crimean–Caucasian Region in the Jurassic 高精度周期相关性是侏罗纪克里米亚-高加索地区详细古气候重建的基础
IF 0.4
Moscow University Geology Bulletin Pub Date : 2024-06-05 DOI: 10.3103/s0145875224700029
R. R. Gabdullin, K. V. Syromyatnikov, E. V. Karpova, M. D. Kazurov, A. Yu. Puzik, I. V. Badyanova, K. P. Kazymov, S. I. Merenkova, N. V. Badulina, A. V. Ivanov, I. R. Migranov
{"title":"High-Precision Cyclic Correlation as a Basis for Detailed Paleoclimatic Reconstructions for Crimean–Caucasian Region in the Jurassic","authors":"R. R. Gabdullin, K. V. Syromyatnikov, E. V. Karpova, M. D. Kazurov, A. Yu. Puzik, I. V. Badyanova, K. P. Kazymov, S. I. Merenkova, N. V. Badulina, A. V. Ivanov, I. R. Migranov","doi":"10.3103/s0145875224700029","DOIUrl":"https://doi.org/10.3103/s0145875224700029","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>Astrochronological (cyclostratigraphic) referencing of the lithological and geochemical characteristics of Jurassic deposits of the Crimea Mountains and the Caucasus to the eccentricity cycles of Earth’s orbit is performed, the relationship of the determined variations in climate and paleotemperature with the times of coincidence of different orders of eccentricity cycles is analyzed, and their paleoclimatic description is given. New data on paleotemperatures of the Southern Demerdzhi Mountain section are presented.</p>","PeriodicalId":44391,"journal":{"name":"Moscow University Geology Bulletin","volume":"13 1","pages":""},"PeriodicalIF":0.4,"publicationDate":"2024-06-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141253174","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
Carboniferous Strata in Maloyaroslavets (Kaluga Region) and Its Biostratigraphy Based on Foraminifers and Conodonts 马洛亚罗斯拉维茨（卡卢加地区）石炭纪地层及其基于有孔虫和锥齿动物的生物地层学
IF 0.4
Moscow University Geology Bulletin Pub Date : 2024-06-05 DOI: 10.3103/s0145875224700170
A. S. Alekseev, N. B. Gibshman, N. V. Goreva, K. V. Sakhnenko
{"title":"Carboniferous Strata in Maloyaroslavets (Kaluga Region) and Its Biostratigraphy Based on Foraminifers and Conodonts","authors":"A. S. Alekseev, N. B. Gibshman, N. V. Goreva, K. V. Sakhnenko","doi":"10.3103/s0145875224700170","DOIUrl":"https://doi.org/10.3103/s0145875224700170","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>The study of a core of borehole 8 drilled in the town of Maloyaroslavets to a depth of 94 m has made it possible to obtain the biostratigraphic characteristics of the Tarusian and Protvian regional substages of the Serpukhovian Stage and lower part of the Vereian Regional Substage of the Moscovian Stage based on foraminifers and conodonts. The Tarusian Regional Substage is attributed to the <i>Neoarchaediscus postrugosus</i> Zone. The <i>Eostaffellina paraprotvae</i> Zone has been established in the Protvian Regional Substage, and a deep-water conodont assemblage of the <i>Gnathodus bollandensis</i> Zone has been found in its upper part (6.8–12.0 m above the base). The generalization of all data on conodonts of the Protvian Regional Substage of the Moscow Syneclise has shown that it contains at least four transgressive–regressive cyclites. The type locality of the species <i>Eostaffellina protvaeensis</i> has been specified in the Tetyuevo section in the Rzhev Volga region. A rich assemblage of conodonts from the Vereian Alyutovo Formation of the Moscovian Stage belongs to the <i>Declinognathodus donetzianus</i> Zone.</p>","PeriodicalId":44391,"journal":{"name":"Moscow University Geology Bulletin","volume":"52 1","pages":""},"PeriodicalIF":0.4,"publicationDate":"2024-06-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141253330","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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