Moscow University Geology Bulletin最新文献

{"title":"The Possibilities of On-Board Gravimetric and Hydromagnetic Surveys in Solving Engineering-Geological Problems on the Shelf","authors":"M. V. Kochetov, A. A. Shepelev, S. V. Chelyshev","doi":"10.3103/s0145875223040087","DOIUrl":"https://doi.org/10.3103/s0145875223040087","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>The possibilities of using on-board gravimetry and hydromagnetometry together with high-resolution seismic surveying in the framework of engineering-geological surveying in the Arctic shelf area of the Russian Federation are considered. The surveys were carried out in the southern part of the Kara Sea shelf in a study area of 25 km² in order to identify potentially hazardous zones for setting up a floating drilling rig. The studies were carried out using a regular survey grid, consisting of 51 row and 26 secant profiles. The length of each profile was 5 km. The gravity surveys were performed with a Chekan-AM marine on-board gravimeter. The magnetometer surveys were conducted using SeaSPY 2 towed marine magnetometers. The dense survey grid, high-precision equipment, and field work procedure made it possible to obtain high accuracy of surveys: 0.14 mGal and 1.12 nT. The depth of research in engineering-geological surveying by the presented set of methods varied from the first hundred meters to 1 km. The long-term experience in engineering-geological surveys in the Arctic shelf area by personnel of Marine Arctic Exploration Expedition JSC shows that paleoincisons and paleovalleys are common hazards of a geological nature in this region. These structures are conventionally filled with weakly consolidated, often gas-saturated, sediments with inclusions of large-rock fragments. Paleoincisions clearly manifest themselves in the high-frequency component of the magnetic field; the local component of the anomalous magnetic field was calculated to detect them. As a result of complex interpretation of gravity field anomalies and magnetic survey data, a curved linear zone intersecting the entire study area has been localized. The identified anomalous zone is confined to the boundaries of the paleoincision, which was originally discovered according to the data of seismoacoustic studies. Based on the results of interpreting the magnetometer surveys, an area of negative magnetic anomalies was found in the eastern part of the study area. According to the materials of seismoacoustic studies, paleoincisions of a complex spatial and deep configuration are traced in this zone. It is noteworthy that these structures do not occur in the magnetic field. Based on the obtained values of the gravity field and seismoacoustic data, a seismic-density section of meridional strike was constructed across the entire area. As a result of 2D seismo-density modeling, the densities for the undercut paleoincision were selected and two decompacted areas were found at a depth of 200 m. The decompacted areas can be caused by the gas saturation of the sedimentary stratum and need to be considered in installing a floating drilling rig. The interpretation of the anomalous gravity field in the specified complex of geophysical methods with a priori geological information allows the prediction of the density structure of the study","PeriodicalId":44391,"journal":{"name":"Moscow University Geology Bulletin","volume":null,"pages":null},"PeriodicalIF":0.4,"publicationDate":"2023-11-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138540874","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}

{"title":"Disjunctive Dislocations in Upper Cretaceous Rocks on the Northeastern Slope of the Chufut-Kale Plateau (Bakhchisarai District, Crimea)","authors":"P. A. Fokin","doi":"10.3103/s0145875223040063","DOIUrl":"https://doi.org/10.3103/s0145875223040063","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>This paper describes fracture and low-amplitude fault systems in Upper Cretaceous deposits in the vicinity of the Chufut-Kale “cave town.” Analysis of the orientations and kinematics of the faults and fracture parageneses has made it possible to reconstruct stress-fields of the Alpine tectonic stage and their rough order. An assumption on the appearance of sublatitudinal compression in Mountainous Crimea has been made.</p>","PeriodicalId":44391,"journal":{"name":"Moscow University Geology Bulletin","volume":null,"pages":null},"PeriodicalIF":0.4,"publicationDate":"2023-11-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138540882","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}

{"title":"The Causes of Tectonic and Seismic Activity of the Liskin Fault Zone (the Southeastern Voronezh Uplift, the East European Platform)","authors":"T. V. Sukhanova, N. V. Makarova, A. N. Stafeev, L. I. Nadezhka, A. I. Tregub, I. T. Ezhova, A. E. Semenov","doi":"10.3103/s0145875223040129","DOIUrl":"https://doi.org/10.3103/s0145875223040129","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>The Liskin fault zone located in the southeastern part of the East European Platform at the boundary between two large neotectonic structures, that is, the Voronezh Uplift and the Oka–Don basin, is considered. Earthquake epicenters are concentrated in the fault zone and the adjacent territory. The neotectonic structures of the territory, topography, structure of the multi-depth and age horizons of the sedimentary cover, basement, crust, Moho surface are investigated, and the causes of neotectonic and seismic activity of the zone are determined. At present, the Liskin fault develops as a thrust fault with a dextral strike-slip component under the conditions of submeridional compression and the adjacent territory is under the influence of multidirectional tectonic compression stresses: from the north, from the Oka–Don basin and from the south, from the Caucasian segment of the Alpine collision belt. This is reflected in the morphology and structure of the neotectonic structures. The deformation of multi-depth horizons as well as the Earth’s surface and the activation of seismicity are associated with the submeridional compression. The deep material and structural inhomogeneities of the Earth’s crust are of great importance. The collision zone between two oncoming submeridional stresses that led to active seismicity has been identified in the neotectonic structure of the south-eastern part of the East European Platform for the first time.</p>","PeriodicalId":44391,"journal":{"name":"Moscow University Geology Bulletin","volume":null,"pages":null},"PeriodicalIF":0.4,"publicationDate":"2023-11-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138540880","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}

{"title":"Chromian Tourmaline and Cr–Sb–W-Bearing Rutile of the Kamennoozerskoe Chromitite Occurrence, Central Urals, Russia","authors":"I. A. Baksheev, Yu. V. Erokhin, I. A. Ekimenkova, A. V. Zakharov, V. V. Grigoriev, V. O. Yapaskurt, N. N. Koshlyakova","doi":"10.3103/s0145875223040038","DOIUrl":"https://doi.org/10.3103/s0145875223040038","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>Tourmaline, rutile, and associated minerals from veinlets cutting chromitites are characteristic of the Kamennoozerskoe occurrence belonging to the Shabrovskii district in the Central Urals. Tourmaline belongs to the dravite–oxy-dravite series and contains Cr (0.52–2.06 apfu), Ni (up to 0.03 apfu), and V (up to 0.02 apfu). Raman spectroscopy indicates Fe³⁺ in tourmaline. Rutile associated with tourmaline contains, wt %: Sb₂O₅ 4.68–11.69, Cr₂O₃ 2.00–8.02, and WO₃ 0.88–1.14. It is suggested that tourmaline and associated minerals were formed under oxidizing conditions.</p>","PeriodicalId":44391,"journal":{"name":"Moscow University Geology Bulletin","volume":null,"pages":null},"PeriodicalIF":0.4,"publicationDate":"2023-11-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138540894","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}

{"title":"A Model of a Shear Landslide Wedge with Subsequent Hydraulic Rupture as an Explanation for the Formation of an Anomalous Section of the Bazhenov Formation in the North of Western Siberia. Part 2. Description of the Mesostructural Complexes in the Core and the Model of the Anomalous Formation of the Section","authors":"P. A. Fokin, M. R. Latypova, A. G. Fedyaevskiy, A. G. Kalmykov, G. A. Kalmykov, N. A. Shadchnev, A. S. Butkeev, I. B. Soklakov, Yu. A. Gatovsky, J. A. Kotochkova","doi":"10.3103/s0145875223040075","DOIUrl":"https://doi.org/10.3103/s0145875223040075","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>A new anomalous section of the Bazhenov Formation has been described on the territory of the Urengoy deposit in the northern part of Western Siberia. This article describes mesostructural complexes in the core, which have served as a basis for the suggestion of a new model for the formation of the anomalous section of the Bazhenov Formation. It has been found that the mesostructural complexes were formed at different landslide stages and during the movement of the landslide body along the uneven surface of the detachment. The main role in the formation of large injection “sand veins” in the studied section was probably played by the landslide-induced grain flow from the coastal shallow water area. The penetration of its sandy material into the rocks of the Bazhenov Formation and, to a lesser extent, the Achimov Formation was determined by the energy of a hydraulic shock and hydraulic fracturing along layer-by-layer and secant fractures.</p>","PeriodicalId":44391,"journal":{"name":"Moscow University Geology Bulletin","volume":null,"pages":null},"PeriodicalIF":0.4,"publicationDate":"2023-11-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138540920","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}

{"title":"The Effect of Bioturbation on the Petrophysical Characteristics of the Lower Cretaceous Rocks of Oil and Gas Reservoirs in the Northern Caspian Sea Region","authors":"V. V. Churkina, A. S. Mozgovoy, J. A. Kotochkova, D. V. Klyazhnikov, A. D. Egorova, T. G. Isakova, T. F. Dyakonova, G. A. Kalmykov, S. A. Taldykin, E. E. Kristya","doi":"10.3103/s014587522304004x","DOIUrl":"https://doi.org/10.3103/s014587522304004x","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>The Caspian Sea is one of the most perspective areas for oil and gas exploration. Significant hydrocarbon reserves are contained in polymictic sand reservoirs of the Lower Cretaceous (Aptian–Albian) deposits of the North Caspian fields, which are characterized by an irregular distribution of pelitic and silty fractions. This results in high residual water content and low permeability and poor consistency between filtration and capacity properties. This determines the high heterogeneity of reservoirs in hydrocarbon accumulations and unusually low specific electrical resistivities when producing water-free hydrocarbon inflows. As our studies have shown, the most important reason for the complex structure is the intense bioturbation of deposits virtually throughout the productive section, which actively affects the redistribution of clay material in the reservoir rocks and ultimately leads to a decrease in the resistivity of reservoirs to the point where they can be classified as low resistivity ones.</p>","PeriodicalId":44391,"journal":{"name":"Moscow University Geology Bulletin","volume":null,"pages":null},"PeriodicalIF":0.4,"publicationDate":"2023-11-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138540877","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}

{"title":"Traces of Strong Earthquakes in Ruins of the Afrasiab Archeological Site (Samarkand, Uzbekistan)","authors":"","doi":"10.3103/s0145875223050034","DOIUrl":"https://doi.org/10.3103/s0145875223050034","url":null,"abstract":"<span> <h3>Abstract</h3> <p>We revealed traces of two earthquakes of the 10th and 12th centuries at six objects of the Afrasiab archaeological site. These traces include numerous ruptures and fractures that form a “flower” structure, a subsided graben, and the slopes and turns of fragments of fortress walls. The type of the deformation indicates that the epicenter of the earthquake of the 10th century was located to the west-southwest of the ancient city; the epicenter of the earthquake of the 12th century was to the south-southwest of it. The intensity of both events was VIII–IX points on the MSK-64 scale.</p> </span>","PeriodicalId":44391,"journal":{"name":"Moscow University Geology Bulletin","volume":null,"pages":null},"PeriodicalIF":0.4,"publicationDate":"2023-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139766426","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}

{"title":"New Data on the Conditions of Localization and Composition of Cu–Ni Sulfide Ores in the Western Part of the Oktyabr’skoe Deposit, Norilsk District","authors":"I. O. Krylov, I. I. Nikulin","doi":"10.3103/S0145875223040105","DOIUrl":"https://doi.org/10.3103/S0145875223040105","url":null,"abstract":"","PeriodicalId":44391,"journal":{"name":"Moscow University Geology Bulletin","volume":null,"pages":null},"PeriodicalIF":0.4,"publicationDate":"2023-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139352360","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}

{"title":"A Model of a Shear Landslide Wedge with Subsequent Hydraulic Rupture as an Explanation for an Anomalous Section of the Bazhenov Formation in the North of West Siberia. Article 1. Section Description, Lithology, and Palynology","authors":"P. A. Fokin, M. R. Latypova, A. G. Fedyaevskiy, Y. A. Gatovsky, A. G. Kalmykov, G. A. Kalmykov, N. A. Shadchnev, A. S. Butkeev, I. B. Soklakov","doi":"10.3103/s0145875223030055","DOIUrl":"https://doi.org/10.3103/s0145875223030055","url":null,"abstract":"","PeriodicalId":44391,"journal":{"name":"Moscow University Geology Bulletin","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135145962","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}

{"title":"The Composition and Element’s Speciation in the Spring Waters of the Southern Part of the Balashikha Urban District (Moscow Region)","authors":"O. A. Lipatnikova, T. N. Lubkova, D. A. Yablonskaya, O. R. Filatova, L. A. Dmitrieva","doi":"10.3103/s0145875223030110","DOIUrl":"https://doi.org/10.3103/s0145875223030110","url":null,"abstract":"","PeriodicalId":44391,"journal":{"name":"Moscow University Geology Bulletin","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135145958","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}