@article{MTMT:33608092,
	title = {Thermodynamic model of the deep origin of oil and its phase "freezing"},
	url = {https://m2.mtmt.hu/api/publication/33608092},
	author = {Marakushev, S.A. and Belonogova, O.V.},
	journal-iso = {RUSS J EARTH SCI},
	journal = {RUSSIAN JOURNAL OF EARTH SCIENCES},
	volume = {22},
	unique-id = {33608092},
	issn = {1681-1208},
	year = {2023},
	eissn = {1681-1178},
	pages = {1-26}
}

@article{MTMT:34617164,
	title = {VARIATION OF TOTAL ELECTRON CONTENT OVER NEPAL DURING GEOMAGNETIC STORMS: GPS OBSERVATIONS},
	url = {https://m2.mtmt.hu/api/publication/34617164},
	author = {Silwal, A. and Gautam, S. P. and Poudel, P. and Karki, M. and Chapagain, N. P. and Adhikari, B.},
	doi = {10.2205/2023es000833},
	journal-iso = {RUSS J EARTH SCI},
	journal = {RUSSIAN JOURNAL OF EARTH SCIENCES},
	volume = {23},
	unique-id = {34617164},
	issn = {1681-1208},
	abstract = {Geomagnetic storms have very profound effects on the Total Electron Content (TEC) of the ionosphere. In order to investigate the equatorial and low-latitude ionospheric response to the geomagnetic storms of varying intensities, a detailed study of vertical TEC (VTEC) variations resulting from Global Positioning System (GPS) data acquired at four GPS stations in Nepal along 80 degrees-90 degrees E longitude and 26 degrees-30 degrees N latitude sector has been carried out in the present work. The results were analyzed with other favorable inducing factors (solar wind parameters and geomagnetic indices) affecting TEC to constrain the causative factor. We observed a positive enhancement during all three events studied. During the severe geomagnetic storm event, the deviation was -18 TECU, while it was recorded -12 TECU and -8 TECU during moderate and minor geomagnetic activity, respectively. The Detrended Cross-Correlation Analysis (DXA) illustrates that the hourly averaged VTEC of the BESI station was found to have a strong positive correlation with other stations in three storm events, indicating a similar response of all stations towards the geomagnetic storm. In addition, the correlation of VTEC with solar wind parameters and geomagnetic indices illustrated that the VTEC shows a good positive association with solar wind velocity (Vsw) in all three geomagnetic events. In contrast, the correlation of plasma density (Nsw), interplanetary magnetic field (IMF Bz), the symmetric horizontal component of geomagnetic field (SYM-H), and Geomagnetic Auroral Electrojet (AE) index with VTEC vary with the intensity of the storm. Overall results of the study have revealed the characteristic features of TEC variation over Nepal regions during magnetic storms, which validates earlier research on ionospheric responses to geomagnetic storms and theoretical assumptions.},
	keywords = {GPS; CROSS-CORRELATION; geomagnetic storm; Total Electron Content (TEC); solar wind parameters},
	year = {2023},
	eissn = {1681-1178}
}

@article{MTMT:34316040,
	title = {SECONDARY MINERALS OF FE, PB, CU IN SULFIDE-CONTAINING TAILINGS: SEQUENCE OF FORMATION, ELECTROCHEMICAL REACTIONS AND PHYSICOCHEMICAL MODEL (TALMOVSKIE SANDS, SALAIRE, RUSSIA)},
	url = {https://m2.mtmt.hu/api/publication/34316040},
	author = {Khusainova, A. Sh. and Bortnikova, S. B. and Gaskova, O. L. and Volynkin, S. S. and Kalinin, Yu. A.},
	doi = {10.2205/2023ES000810},
	journal-iso = {RUSS J EARTH SCI},
	journal = {RUSSIAN JOURNAL OF EARTH SCIENCES},
	volume = {23},
	unique-id = {34316040},
	issn = {1681-1208},
	abstract = {The paper presents the results of studies of the composition of secondary Fe, Pb, Cu minerals, formed in contrasting physico-chemical conditions of the stockpiled tailings from the enrichment of Salair barite-polymetallic ores (West Siberia, Russia). The complex mineral composition of ores containing pyrite, chalcopyrite, sphalerite, galena, fahlore, and long-term chemical weathering contributed to the formation of monomineral and zonal secondary rims and fillings of the intergranular space, which were identified using modern research methods. Plumbojarosite, anglesite, cerussite, and iron hydroxides are predominant among them; pyromorphite, hinsdalite, and covellite are less abundant. Thermodynamic modeling was used to solve the inverse problem of restoring the composition of solutions that led to a sequence change in associations of secondary minerals. The observed processes are determined not only by chemical interaction, but also by electrochemical reactions in the systems under consideration, where various mineral components act as galvanic couples. These two processes, combined with the physicochemical parameters of the environment (pH, Eh, ionic composition of solutions), lead to stepwise or incomplete oxidation of the original minerals, followed by selective deposition of the secondary compounds.},
	keywords = {Electrochemical reactions; secondary minerals; Sulfide tailings; physico-chemical model},
	year = {2023},
	eissn = {1681-1178}
}

@article{MTMT:33961859,
	title = {THERMODYNAMIC MODEL OF DEEP OIL ORIGIN AND ITS PHASE "FREEZING"},
	url = {https://m2.mtmt.hu/api/publication/33961859},
	author = {Marakushev, S. A. and Belonogova, O. V.},
	doi = {10.2205/2022ES000807},
	journal-iso = {RUSS J EARTH SCI},
	journal = {RUSSIAN JOURNAL OF EARTH SCIENCES},
	volume = {22},
	unique-id = {33961859},
	issn = {1681-1208},
	abstract = {In most modern studies of lithospheric (petrogenic) carbonreservoirs in the earth's crust, it is assumed that crude oil and natural gas (petroleum) are thermal generation products from the relics of biological organic matter accumulated in sedimentary rocks during geological time and deeply buried in a region of high pressure and temperature. In this sedimentary-migration ("biogenic") concept of the origin of oil, the direction of the proposed evolutionary process of carbon transformation was determined: buried biological material. kerogen. oil. gas as a manifestation of progressive metamorphism (pressure and temperature increase). However, the discovery of kerogen in the meteorite's composition does not allow us to suggest a biological source of carbon for the formation of this polymeric "organic" substance, but in turn allows us to suggest inorganic sources of kerogen, namely "oil" and "gas"non methane hydrocarbons (HCs), originated in the depths of their parent bodies (icy planetesimals). The genetic relationship of oil, natural gas and carbon matter of black shale formations (kerogen) on Earth is also beyond doubt, and therefore, in this paper, the evolution of petrogenic carbon reservoirs, including oil shale rocks in the lithosphere, is considered on the basis of a deep inorganic concept, in which the direction of the carbon transformation process is the opposite of the biogenic concept and is represented as HCs. gas. oil. kerogen. The analysis of phase diagrams and experimental data made it possible to determine two trends in the evolution of non-methane hydrocarbons in the Earth's interior. In the upper mantle, the "metastability" of heavy (with a lower H/C ratio) HCs increases with depth. However, at temperatures and pressures corresponding to the surface mantle-crustal hydrothermal conditions, the "relative metastability" of heavy hydrocarbons increases with approach to the surface. When deep HCs fluids rise to the surface, petrogenic oil reservoirs are formed as a result of the decreases in hydrogen fugacity and a phase transition: gas HCs. liquid oil. At the physical and chemical conditions of an oil reservoir, metastable reversible phase equilibria are established between liquid oiland H2O, gas HCs and CO2, and solid (pseudocrystalline) "mature" and "immature" kerogens of "oil source" rocks. A decrease in hydrogen pressure and temperature leads to a stoichiometric phase transition ("freezing") of liquid oil into solid kerogens. This occurs as a result of oil dehydrogenation in the processes of high-temperature CO2 fixation and low-temperature hydration of oil hydrocarbons, which are the main geochemical pathways for its transformation into kerogen. Thus, the formation of carbon matter in petrogenic reservoirs is the result of regressive (retrograde) metamorphism of deep hydrocarbon fluids, natural gas, liquid oil, and naphthide accumulations.},
	keywords = {FLUIDS; HYDROCARBONS; HYDRATION; OIL; Phase diagrams; Chemical potentials; CO2 fixation; Black shales; Metastable equilibria; Kerogen; petrogenic carbon reservoirs; naphthide genesis; regressive metamorphism},
	year = {2022},
	eissn = {1681-1178}
}

@article{MTMT:33760893,
	title = {Anomalous porosity preservation in the Lower Cretaceous Nahr Umr sandstone, Southern Iraq},
	url = {https://m2.mtmt.hu/api/publication/33760893},
	author = {Mohammed, Abbas Kareem Abdulsahib},
	doi = {10.2205/2020ES000739},
	journal-iso = {RUSS J EARTH SCI},
	journal = {RUSSIAN JOURNAL OF EARTH SCIENCES},
	volume = {21},
	unique-id = {33760893},
	issn = {1681-1208},
	abstract = {Core description, well logs data, petrographic analysis and scanning electron microscope technique were conducted to unravel factors controlling the preservation of high porosity up to 25% in deeply-buried sandstones > 4 km of the Lower Cretaceous Nahr Umr reservoir, southern Iraq. The Nahr Umr Formation composed of sandstone interbedded with shale, minor siltstones and streaks of limestone. The sandstones are arenites and range from fine to coarse, and poor to moderate sorted. Parallel lamination, planer cross-bedded and lenticular bedding are common sedimentary structures found in the formation, suggesting that the Nahr Umr deposited in fluvial-deltaic to the shallow-marine environment. Cementation by syntaxial quartz overgrowth was retarded by the presence of illite coats, which was formed by the illitization of the infiltrated smectite that formed during the deposition around the quartz grains. Microquartz coats in the form of quartz crystals probably further prevented the quartz overgrowths. Thus, the porosity of Nahr Umr preserved by the illite coats and microquartz crystals, whereas, the process of K-feldspar dissolution has created secondary porosity. The stylolite formation and the quartz-calcite replacement are the main sources of silica for the precipitation of quartz overgrowth.},
	year = {2021},
	eissn = {1681-1178},
	orcid-numbers = {Mohammed, Abbas Kareem Abdulsahib/0000-0003-4813-369X}
}

@article{MTMT:31948470,
	title = {Evaluation of heat and salt transports by mesoscale eddies in the Lofoten Basin},
	url = {https://m2.mtmt.hu/api/publication/31948470},
	author = {Belonenko, T. and Zinchenko, V. and Gordeeva, S. and Raj, R.P.},
	doi = {10.2205/2020es000720},
	journal-iso = {RUSS J EARTH SCI},
	journal = {RUSSIAN JOURNAL OF EARTH SCIENCES},
	volume = {20},
	unique-id = {31948470},
	issn = {1681-1208},
	year = {2020},
	eissn = {1681-1178}
}

@article{MTMT:31442639,
	title = {Geochemistry and petrology of two kimberlites at Krishtipadu from Gooty cluster, Andhra Pradesh, southern India - evidence of kimberlite magmatism and a possible carbonatite association within Palaeoproterozoic lower Cuddapah basin},
	url = {https://m2.mtmt.hu/api/publication/31442639},
	author = {Phani, PRC and Sengupta, P and Basu, S},
	doi = {10.2205/2020ES000666},
	journal-iso = {RUSS J EARTH SCI},
	journal = {RUSSIAN JOURNAL OF EARTH SCIENCES},
	volume = {20},
	unique-id = {31442639},
	issn = {1681-1208},
	abstract = {This paper addresses geochemical and petrological aspects of two outcropping kimberlites (5023 and 5119) of the Gooty cluster, emplaced in carbonate sediments of Vempalli Formation of lower Cuddapah basin at Krishtipadu, Anantapur district, Andhra Pradesh, southern India. These pipes were discovered by the Rio Tinto Exploration Group in the recent past. The 5023 kimberlite is enriched in olivine and serpentine while the 5119 pipe possesses haematitised olivine pseudomorphs. The field, textural characteristics and whole rock geochemistry qualify both the pipes for hypabyssal kimberlite breccias of Group-I type similar to world's classical occurrences. The carbon and oxygen stable isotope data, aided with field and petrological studies, indicates existence of possible carbonatite (sovite) phase associated with the 5119 kimberlite. The two kimberlites appear to be originated from a low degree of partial melting ranging from 0.5 to 2.5%. Enrichment of LREE with a high LREE/HREE ratio indicates fractionation at the mantle source region. Whole rock geochemistry supports their diamondiferous nature. Presence of crustal xenoliths post-dates subsequent emplacement of the two pipes to lower Cuddapah sedimentation (2.4 Ga), manifesting kimberlite magmatism. These pipes are the only known Group-I kimberlites from the Proterozoic Cuddapah Basin and therefore warrant detailed investigations.},
	keywords = {Stable Isotope; Carbonatite; Kimberlite; palaeoproterozoic; archetypal Group-I; Gooty Kimberlite Cluster; lower Cuddapah basin},
	year = {2020},
	eissn = {1681-1178}
}

@article{MTMT:31421277,
	title = {Development and testing of a portable "noise-meter" for areal magnetic noise survey},
	url = {https://m2.mtmt.hu/api/publication/31421277},
	author = {Kudin, D. V and Uchaikin, E. O. and Gvozdarev, A. Yu and Kudryavtsev, N. G. and Krasnoperov, R. I and Szollosy, J. and Hegymegi, L.},
	doi = {10.2205/2020ES000713},
	journal-iso = {RUSS J EARTH SCI},
	journal = {RUSSIAN JOURNAL OF EARTH SCIENCES},
	volume = {20},
	unique-id = {31421277},
	issn = {1681-1208},
	abstract = {Installation of modern highly sensitive magnetometric equipment at geophysical observatories requires location of places with a low level of magnetic noise. It is also required to perform regular control of noise environment at observatory instrument installation points. This work is aimed at testing one of the prototypes of magnetic noise measuring instruments, capable of performing fast areal measurements. The key features of this prototype are high sensitivity and linearity and capability of registration of magnetic noise in different frequency bands.},
	keywords = {Magnetic observatory; magnetic data; ground-based monitoring},
	year = {2020},
	eissn = {1681-1178}
}

@article{MTMT:31038158,
	title = {Radionuclide distribution in components of the Sarbalyk limnetic system (Baraba lowland, Western Siberia)},
	url = {https://m2.mtmt.hu/api/publication/31038158},
	author = {Ovdina, E.A. and Vera, D. and Zarubina, E.Y. and Yermolov, Y.V.},
	doi = {10.2205/2019ES000681},
	journal-iso = {RUSS J EARTH SCI},
	journal = {RUSSIAN JOURNAL OF EARTH SCIENCES},
	volume = {19},
	unique-id = {31038158},
	issn = {1681-1208},
	year = {2019},
	eissn = {1681-1178}
}

@article{MTMT:33879527,
	title = {Poroelastic response to rapid decarbonatisation as a mechanism of the diamonds formation in the mantle wedge of Kamchatka},
	url = {https://m2.mtmt.hu/api/publication/33879527},
	author = {Simakin, A. G.},
	doi = {10.2205/2019ES000677},
	journal-iso = {RUSS J EARTH SCI},
	journal = {RUSSIAN JOURNAL OF EARTH SCIENCES},
	volume = {19},
	unique-id = {33879527},
	issn = {1681-1208},
	abstract = {Various geodynamic mechanisms can lead to the penetration of siliceous carbonates into the mantle wedge. Their thermal decomposition in the "mantle olivine autoclave" can be a mechanism for the formation of diamond erupted in subduction zone of Kamchatka. Using the theory of poroelasticity, we showed that rapid heating of a mixture of sideritic dolomite and silica on 150-200 degrees C in the closed system conditions can temporarily lead to an increase in the fluid pressure by 2-3 GPa. With the initial parameters P = 2 GPa and T = 830 degrees C, the carbonic fluid produced during the reaction would get into the PT stability field of the diamond. The growth of diamond at the fluid decomposition in the PT field of metastable graphite can be enhanced by microparticles of native Ni and Mn formed by the thermal decomposition of gaseous metals carbonyls. The corresponding abundant micro-inclusions of Ni and Mn were found in Kamchatka diamonds.},
	keywords = {FLUID; EQUILIBRIUM; carbon monoxide; magmas; garnet; Diamond; CO2; INCLUSIONS; coesite; Mantle wedge; GPA; Diopside; Poro-elasticity; decarbonatisation},
	year = {2019},
	eissn = {1681-1178}
}