Pub Date : 2023-01-01DOI: 10.31431/1816-5524-2023-3-59-67-86
V.T. S'edin, S.P. Pletnev, T.E. Sedysheva
Five tectonic-magmatic stages are distinguished in the evolution of the guyots of the Magellan Seamounts: 1 — Late Jurassic-Early Cretaceous (earliest Cretaceous — ~160–140 (?) Ma); 2 — Early Cretaceous (Late Barremian(?)-Aptian-Albian — ~127–96 Ma); 3 — Late Cretaceous (Late Cenomanian (?)-Turonian-Early Campanian — ~95–76 Ma); 4 — Late Cretaceous (Late Campanian-Maastrichtian — ~74.5–66.0 Ma); 5 — Cenozoic — 66–0 Ma. Each of the tectonic-magmatic stages corresponds to a certain age complex of volcanic rocks of the Magellan Seamount. Tectonic-magmatic stages have different durations and played different roles in the evolution and formation of the modern structure of the guyots of the Magellanic Seamounts. Each of the tectono-magmatic stages characterizes a specific geomorphological space of guyots (base, main part of the edifice, small complicating superimposed structures of the 2-nd order). Each of the tectonic-magmatic stages characterizes a specific geomorphological space of guyots (base, main body, small complicating superimposed second-order structures). On the whole, the tectonic-magmatic stages of the evolution of the Magellan Seamounts are in good agreement with the evolution stages of some other regions of the Pacific Ocean and correspond to the previously established periods of their tectonic-magmatic activation.
{"title":"Volcanic complexes and tectonic-magmatic stages of the evolution of the Guyots of the Magellan Seamounts (Pacific Ocean). Communication 2: Tectono-magmatic stages","authors":"V.T. S'edin, S.P. Pletnev, T.E. Sedysheva","doi":"10.31431/1816-5524-2023-3-59-67-86","DOIUrl":"https://doi.org/10.31431/1816-5524-2023-3-59-67-86","url":null,"abstract":"Five tectonic-magmatic stages are distinguished in the evolution of the guyots of the Magellan Seamounts: 1 — Late Jurassic-Early Cretaceous (earliest Cretaceous — ~160–140 (?) Ma); 2 — Early Cretaceous (Late Barremian(?)-Aptian-Albian — ~127–96 Ma); 3 — Late Cretaceous (Late Cenomanian (?)-Turonian-Early Campanian — ~95–76 Ma); 4 — Late Cretaceous (Late Campanian-Maastrichtian — ~74.5–66.0 Ma); 5 — Cenozoic — 66–0 Ma. Each of the tectonic-magmatic stages corresponds to a certain age complex of volcanic rocks of the Magellan Seamount. Tectonic-magmatic stages have different durations and played different roles in the evolution and formation of the modern structure of the guyots of the Magellanic Seamounts. Each of the tectono-magmatic stages characterizes a specific geomorphological space of guyots (base, main part of the edifice, small complicating superimposed structures of the 2-nd order). Each of the tectonic-magmatic stages characterizes a specific geomorphological space of guyots (base, main body, small complicating superimposed second-order structures). On the whole, the tectonic-magmatic stages of the evolution of the Magellan Seamounts are in good agreement with the evolution stages of some other regions of the Pacific Ocean and correspond to the previously established periods of their tectonic-magmatic activation.","PeriodicalId":32821,"journal":{"name":"Vestnik Kamchatskoi regional''noi assotsiatsii Uchebnonauchnyi tsentr Seriia Nauki o Zemle","volume":"90 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135838453","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}
Pub Date : 2023-01-01DOI: 10.31431/1816-5524-2023-3-59-20-41
A.G. Nurmukhamedov, M.D. Sidorov
Since the eighties of the last century and up to the present time, a complex of geophysical methods including earthquake converted-waves method, magnetotelluric sounding, gravimetry, magnetometry and seismological have been implemented in southeast Kamchatka. Based on the complex interpretation of the data obtained, a geological and geophysical model of the Earth's crust and upper mantle along the bay profile of Khodutka Bay – Nikolaevka village was constructed. Genetic relationship between active areas of the Earth's crust and gold deposits was established. The hypothesis of division of the formerly unified xenoblock into two separate fragments under the impact of shear along the Nachikinskaya zone of transverse dislocations has been suggested. The southern fragment is represented by the Coastal terrane. To the west of the terrane is a permeable zone with modern volcanism. Intrusion of magma and high-temperature fluids enriched with noble metals into the upper crustal layers occurs along the magmatic channel formed in the paleosubduction zone.
{"title":"Structure of the lithosphere and its controlS on gold mineraliSation in Southeast Kamchatka","authors":"A.G. Nurmukhamedov, M.D. Sidorov","doi":"10.31431/1816-5524-2023-3-59-20-41","DOIUrl":"https://doi.org/10.31431/1816-5524-2023-3-59-20-41","url":null,"abstract":"Since the eighties of the last century and up to the present time, a complex of geophysical methods including earthquake converted-waves method, magnetotelluric sounding, gravimetry, magnetometry and seismological have been implemented in southeast Kamchatka. Based on the complex interpretation of the data obtained, a geological and geophysical model of the Earth's crust and upper mantle along the bay profile of Khodutka Bay – Nikolaevka village was constructed. Genetic relationship between active areas of the Earth's crust and gold deposits was established. The hypothesis of division of the formerly unified xenoblock into two separate fragments under the impact of shear along the Nachikinskaya zone of transverse dislocations has been suggested. The southern fragment is represented by the Coastal terrane. To the west of the terrane is a permeable zone with modern volcanism. Intrusion of magma and high-temperature fluids enriched with noble metals into the upper crustal layers occurs along the magmatic channel formed in the paleosubduction zone.","PeriodicalId":32821,"journal":{"name":"Vestnik Kamchatskoi regional''noi assotsiatsii Uchebnonauchnyi tsentr Seriia Nauki o Zemle","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135838438","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}
Pub Date : 2023-01-01DOI: 10.31431/1816-5524-2023-3-59-42-52
E.A. Matveenko, D.V. Chebrov
Estimation of the influence of anthropogenic factors on the seismic signal is an important problem in ensuring the quality of seismological data and, accordingly, the quality of scientific research. Due to the unprecedented situation associated with the introduction of measures to prevent the spread of COVID-19, non-working days were established in Russia from April 4 to April 30, 2020. It became possible to assess the impact of a notable decrease in anthropogenic activity on the seismic signal (noise) recorded by seismic instruments in the territory of the largest city of the Kamchatka, Petropavlovsk-Kamchatsky. We study seismic noise by standard technique, based on the analysis of the probability density function of the noise power spectral density obtained from the data of the digital archive of the noise spectra of seismic stations. A decrease in the seismic noise power level below the minimum values of the same periods of previous years was registered at stations installed in schools, residential buildings (boarding schools) or near public and office buildings. The minimal anthropogenic influence stations were selected. The obtained data can be used for determination the features of the work of both stations and individual channels, taking into account their direction and position, relative to the objects of human activity.
{"title":"ANOMALOUS REDUCTION IN THE LEVEL OF SEISMIC NOISE IN PETROPAVLOVSK-KAMCHATSKY IN APRIL 2020","authors":"E.A. Matveenko, D.V. Chebrov","doi":"10.31431/1816-5524-2023-3-59-42-52","DOIUrl":"https://doi.org/10.31431/1816-5524-2023-3-59-42-52","url":null,"abstract":"Estimation of the influence of anthropogenic factors on the seismic signal is an important problem in ensuring the quality of seismological data and, accordingly, the quality of scientific research. Due to the unprecedented situation associated with the introduction of measures to prevent the spread of COVID-19, non-working days were established in Russia from April 4 to April 30, 2020. It became possible to assess the impact of a notable decrease in anthropogenic activity on the seismic signal (noise) recorded by seismic instruments in the territory of the largest city of the Kamchatka, Petropavlovsk-Kamchatsky. We study seismic noise by standard technique, based on the analysis of the probability density function of the noise power spectral density obtained from the data of the digital archive of the noise spectra of seismic stations. A decrease in the seismic noise power level below the minimum values of the same periods of previous years was registered at stations installed in schools, residential buildings (boarding schools) or near public and office buildings. The minimal anthropogenic influence stations were selected. The obtained data can be used for determination the features of the work of both stations and individual channels, taking into account their direction and position, relative to the objects of human activity.","PeriodicalId":32821,"journal":{"name":"Vestnik Kamchatskoi regional''noi assotsiatsii Uchebnonauchnyi tsentr Seriia Nauki o Zemle","volume":"28 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135838450","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}
Pub Date : 2023-01-01DOI: 10.31431/1816-5524-2023-3-59-104-118
A.V. Mozherovsky
Authigenic minerals in Phanerozoic volcanogenic-sedimentary deposits in the northern part of the transition zone from the Asian continent to the Pacific Ocean have been studied. Сhlorite, mica, corrensite, rectorite, defective chlorite, kaolinite, smectite, calcite, barite, gypsum, epsomite, zeolites, cristobalite, quartz, and goethite were found. Corrensite, rectorite; associations: corrensite-laumontite, corrensite-epsomite-authigenic calcite and mica-kaolinite-quartz have significant indicative properties. Such a set of minerals indicates that the thickness of sediments in the studied basins could reach three to five kilometers, and the temperature of their formation could be more than 150°C. The mica-kaolinite association may indicate epicontinental sedimentation conditions associated with coal formation on nearby land, corrensite-chlorite association may indicate conditions favorable for the evaporation of sea water, and the presence of laumontite in it may indicate the periodic calcium supply to the sedimentation basin. Periods of mineral formation, possibly related to global climatic events — 113–120, 110–113, 105–110, 93–95, 72–83, 61–72, 56–61, 33–56 Ma, were identified, which can serve as reference for reconstructing the conditions of sedimentation and a basis for more reliable stratigraphic constructions.
{"title":"Authigenic Minerals in Phanerozoic Volcanogenic-Sedimentary deposits of the Northern Part of the Transition Zone from the Asian Continent to the Pacific Ocean","authors":"A.V. Mozherovsky","doi":"10.31431/1816-5524-2023-3-59-104-118","DOIUrl":"https://doi.org/10.31431/1816-5524-2023-3-59-104-118","url":null,"abstract":"Authigenic minerals in Phanerozoic volcanogenic-sedimentary deposits in the northern part of the transition zone from the Asian continent to the Pacific Ocean have been studied. Сhlorite, mica, corrensite, rectorite, defective chlorite, kaolinite, smectite, calcite, barite, gypsum, epsomite, zeolites, cristobalite, quartz, and goethite were found. Corrensite, rectorite; associations: corrensite-laumontite, corrensite-epsomite-authigenic calcite and mica-kaolinite-quartz have significant indicative properties. Such a set of minerals indicates that the thickness of sediments in the studied basins could reach three to five kilometers, and the temperature of their formation could be more than 150°C. The mica-kaolinite association may indicate epicontinental sedimentation conditions associated with coal formation on nearby land, corrensite-chlorite association may indicate conditions favorable for the evaporation of sea water, and the presence of laumontite in it may indicate the periodic calcium supply to the sedimentation basin. Periods of mineral formation, possibly related to global climatic events — 113–120, 110–113, 105–110, 93–95, 72–83, 61–72, 56–61, 33–56 Ma, were identified, which can serve as reference for reconstructing the conditions of sedimentation and a basis for more reliable stratigraphic constructions.","PeriodicalId":32821,"journal":{"name":"Vestnik Kamchatskoi regional''noi assotsiatsii Uchebnonauchnyi tsentr Seriia Nauki o Zemle","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135838443","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}
Pub Date : 2023-01-01DOI: 10.31431/1816-5524-2023-3-59-87-93
O.L. Savelyeva, D.P. Savelyev, O.A. Zobenko
When studying the material composition of sedimentary formations, the problem of identifying extraterrestrial matter arises, in particular, distinguishing cosmic spherules from technogenic and volcanogenic ones. Based on the results of study of a collection of 482 volumetric spherules separated from ferromanganese crusts from the Pacific Ocean floor, an additional feature of such identification based on relief forms on the surface of spherules is proposed. The article gives a detailed description of such relief forms arising during the passage by cosmic particles through the upper layers of the Earth’s atmosphere, isolation and separation of the Fe-Ni cores from the spherules. The presence of a round hemispherical cavity on the flattened side of the spherule, a depression with concentric circles, or a «button» structure, as well as the presence of a Fe-Ni core is a sufficient but not necessary sign to consider a spherule cosmogenic.
{"title":"Relief forms on the surface of cosmogenic spherules as a sign of their origin","authors":"O.L. Savelyeva, D.P. Savelyev, O.A. Zobenko","doi":"10.31431/1816-5524-2023-3-59-87-93","DOIUrl":"https://doi.org/10.31431/1816-5524-2023-3-59-87-93","url":null,"abstract":"When studying the material composition of sedimentary formations, the problem of identifying extraterrestrial matter arises, in particular, distinguishing cosmic spherules from technogenic and volcanogenic ones. Based on the results of study of a collection of 482 volumetric spherules separated from ferromanganese crusts from the Pacific Ocean floor, an additional feature of such identification based on relief forms on the surface of spherules is proposed. The article gives a detailed description of such relief forms arising during the passage by cosmic particles through the upper layers of the Earth’s atmosphere, isolation and separation of the Fe-Ni cores from the spherules. The presence of a round hemispherical cavity on the flattened side of the spherule, a depression with concentric circles, or a «button» structure, as well as the presence of a Fe-Ni core is a sufficient but not necessary sign to consider a spherule cosmogenic.","PeriodicalId":32821,"journal":{"name":"Vestnik Kamchatskoi regional''noi assotsiatsii Uchebnonauchnyi tsentr Seriia Nauki o Zemle","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135838440","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}
Pub Date : 2023-01-01DOI: 10.31431/1816-5524-2023-3-59-5-19
E.V. Lebedeva, S.S. Chernomorets
A map of debris flow activity of the Geysernaya river basin, where large-scale debris flow processes associated with the collapse of fragments of the left side of the valley have been observed three times over the past 40 years, was compiled. Three independent debris flow areas of the river basin have been identified and characterized: the upper reaches of the river — the Levaya Geysernaya basin, the middle river course — below the dammed lake formed in 2014, and the lower downstream part — below the dammed lake that existed in 2007–2014. It was found that debris flow processes are typical for most of the Geysernaya river tributaries. Moreover, in the left tributaries debris flows may have aseasonal character, because they are formed in conditions of constant heating and active gas-hydrothermal influence within the thermal fields. The landslide dam formed in 2014 is resistant to erosion, and an independent breakthrough of the dammed lake is unlikely. With further erosion of the 2007 dam and the expansion of the breach in the dam body, collapse of its sides and debris flow in the lower part of the Geysernaya river valley cannot be ruled out. Risks of rockfall, landslide and debris flow processes, the initiation of which is most likely on the left side of the valley, should be considered in planning the development of recreational facilities.
{"title":"Debris Flow activity and specificity of Debris Flow Formation in the Geysernaya river valley (KamchatKa)","authors":"E.V. Lebedeva, S.S. Chernomorets","doi":"10.31431/1816-5524-2023-3-59-5-19","DOIUrl":"https://doi.org/10.31431/1816-5524-2023-3-59-5-19","url":null,"abstract":"A map of debris flow activity of the Geysernaya river basin, where large-scale debris flow processes associated with the collapse of fragments of the left side of the valley have been observed three times over the past 40 years, was compiled. Three independent debris flow areas of the river basin have been identified and characterized: the upper reaches of the river — the Levaya Geysernaya basin, the middle river course — below the dammed lake formed in 2014, and the lower downstream part — below the dammed lake that existed in 2007–2014. It was found that debris flow processes are typical for most of the Geysernaya river tributaries. Moreover, in the left tributaries debris flows may have aseasonal character, because they are formed in conditions of constant heating and active gas-hydrothermal influence within the thermal fields. The landslide dam formed in 2014 is resistant to erosion, and an independent breakthrough of the dammed lake is unlikely. With further erosion of the 2007 dam and the expansion of the breach in the dam body, collapse of its sides and debris flow in the lower part of the Geysernaya river valley cannot be ruled out. Risks of rockfall, landslide and debris flow processes, the initiation of which is most likely on the left side of the valley, should be considered in planning the development of recreational facilities.","PeriodicalId":32821,"journal":{"name":"Vestnik Kamchatskoi regional''noi assotsiatsii Uchebnonauchnyi tsentr Seriia Nauki o Zemle","volume":"4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135838441","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}
Pub Date : 2023-01-01DOI: 10.31431/1816-5524-2023-3-59-94-103
L.V. Zakharikhina, A.K. Guts, P.I. Lesnikova
The peculiarities of the fractionation of rare earth elements (REE) were studied in three genetically similar types of soils in the territory of the humid subtropics of Russia. REE contents were determined by inductively coupled plasma mass spectrometry with full acid decomposition of samples. The following soils were studied: burozems formed on mudstones in the Mzymta river valley; burozems transformed to the state of abrozems formed on similar rocks in Sochi; and brown soils on carbonate rocks in the territory of the Utrish Reserve. Burozems formed in natural conditions on mudstones are characterized by REE fractionation with the predominance of their middle subgroup. In urban soils similar in genesis, an increase in the content of elements of the light subgroup is observed. These changes are due to their transformation as a result of urban load. Over the past 100 years, the soils of the city have undergone significant alkalinization, the index of pH in them increased by 2 units. The relationship between REE fractionation and soil acidity is confirmed by the REE distribution curve for the soils of the Utrish Reserve. The latter are distinguished by an even greater predominance of the light REE subgroup, due to the increased alkalinity of soils caused by the formation of soils on carbonate rocks.
{"title":"Time transformation of fractionation of rare-earth elements in soils under urban load in the humid subtropics of Russia","authors":"L.V. Zakharikhina, A.K. Guts, P.I. Lesnikova","doi":"10.31431/1816-5524-2023-3-59-94-103","DOIUrl":"https://doi.org/10.31431/1816-5524-2023-3-59-94-103","url":null,"abstract":"The peculiarities of the fractionation of rare earth elements (REE) were studied in three genetically similar types of soils in the territory of the humid subtropics of Russia. REE contents were determined by inductively coupled plasma mass spectrometry with full acid decomposition of samples. The following soils were studied: burozems formed on mudstones in the Mzymta river valley; burozems transformed to the state of abrozems formed on similar rocks in Sochi; and brown soils on carbonate rocks in the territory of the Utrish Reserve. Burozems formed in natural conditions on mudstones are characterized by REE fractionation with the predominance of their middle subgroup. In urban soils similar in genesis, an increase in the content of elements of the light subgroup is observed. These changes are due to their transformation as a result of urban load. Over the past 100 years, the soils of the city have undergone significant alkalinization, the index of pH in them increased by 2 units. The relationship between REE fractionation and soil acidity is confirmed by the REE distribution curve for the soils of the Utrish Reserve. The latter are distinguished by an even greater predominance of the light REE subgroup, due to the increased alkalinity of soils caused by the formation of soils on carbonate rocks.","PeriodicalId":32821,"journal":{"name":"Vestnik Kamchatskoi regional''noi assotsiatsii Uchebnonauchnyi tsentr Seriia Nauki o Zemle","volume":"40 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135838447","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}
Pub Date : 2023-01-01DOI: 10.31431/1816-5524-2023-3-59-53-66
A.A. Petrova, O.V. latysheva
In recent decades, the reduction in the area of Arctic ice and its thickness has accelerated. These phenomena are associated with global warming. But the ice cover is destroyed not only under the influence of external causes, but also under the influence of the deep fluid-dynamic factor of the lithosphere. The authors analyzed the satellite observations of ice thickness together with the interpretation of the anomalies of the geomagnetic field and the gravity field. The studies made it possible to put forward an assumption about the influence of thermofluid channels of faults on the formation of the ice cover due to a decrease in the thickness of the ice. The paper presents the results of studying the structure of the lithosphere of the Arctic Ocean in the zones of accelerated ice melting above the outlets of thermofluid channels to the bottom surface. The mechanism of influence of the endogenous factor on the processes of ice destruction is considered. It is noted that the nature of the horizontal layering of the earth's crust affects the process of ice formation. Taking into account the fluid dynamic factor and the layering of the earth's crust on the formation of the ice regime can be useful in determining the optimal transport and logistics routes for year-round navigation along the Northern Sea Route and safe navigation.
{"title":"Impact of the FluId dynamIc Factor on the FormatIon and changes oF the Ice cover In the ArctIc Ocean","authors":"A.A. Petrova, O.V. latysheva","doi":"10.31431/1816-5524-2023-3-59-53-66","DOIUrl":"https://doi.org/10.31431/1816-5524-2023-3-59-53-66","url":null,"abstract":"In recent decades, the reduction in the area of Arctic ice and its thickness has accelerated. These phenomena are associated with global warming. But the ice cover is destroyed not only under the influence of external causes, but also under the influence of the deep fluid-dynamic factor of the lithosphere. The authors analyzed the satellite observations of ice thickness together with the interpretation of the anomalies of the geomagnetic field and the gravity field. The studies made it possible to put forward an assumption about the influence of thermofluid channels of faults on the formation of the ice cover due to a decrease in the thickness of the ice. The paper presents the results of studying the structure of the lithosphere of the Arctic Ocean in the zones of accelerated ice melting above the outlets of thermofluid channels to the bottom surface. The mechanism of influence of the endogenous factor on the processes of ice destruction is considered. It is noted that the nature of the horizontal layering of the earth's crust affects the process of ice formation. Taking into account the fluid dynamic factor and the layering of the earth's crust on the formation of the ice regime can be useful in determining the optimal transport and logistics routes for year-round navigation along the Northern Sea Route and safe navigation.","PeriodicalId":32821,"journal":{"name":"Vestnik Kamchatskoi regional''noi assotsiatsii Uchebnonauchnyi tsentr Seriia Nauki o Zemle","volume":"51 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135838452","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}
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