Pub Date : 2024-04-19DOI: 10.1134/s1028334x24601603
G. A. Alexandrov, A. S. Ginzburg, M. L. Gitarsky, A. V. Chernokulsky, V. A. Semenov
Abstract
Predictive estimates of changes in the climatological boundary of the permafrost zone as a function of the average annual air temperature in the Bolshezemelskaya tundra under various global economy scenarios until the middle of the XXI century have been obtained. The permafrost climatological boundary shift in the northeasterly direction observed in the period from 1950 to 2010 was determined from the threshold average annual air temperature. According to the adjusted scenario forecasts obtained using the climate model, it will continue in the coming decades under any global economy scenario and is an inevitable consequence of the anthropogenic influence on the climate. The study results are important for assessing the prospects and development of a long-term observation network created to monitor the permafrost state and greenhouse gas fluxes in the Russian Federation.
{"title":"Permafrost Boundary Change in the Bolshezemelskaya Tundra under Different Climate Change Scenarios in the XXI Century","authors":"G. A. Alexandrov, A. S. Ginzburg, M. L. Gitarsky, A. V. Chernokulsky, V. A. Semenov","doi":"10.1134/s1028334x24601603","DOIUrl":"https://doi.org/10.1134/s1028334x24601603","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>Predictive estimates of changes in the climatological boundary of the permafrost zone as a function of the average annual air temperature in the Bolshezemelskaya tundra under various global economy scenarios until the middle of the XXI century have been obtained. The permafrost climatological boundary shift in the northeasterly direction observed in the period from 1950 to 2010 was determined from the threshold average annual air temperature. According to the adjusted scenario forecasts obtained using the climate model, it will continue in the coming decades under any global economy scenario and is an inevitable consequence of the anthropogenic influence on the climate. The study results are important for assessing the prospects and development of a long-term observation network created to monitor the permafrost state and greenhouse gas fluxes in the Russian Federation.</p>","PeriodicalId":11352,"journal":{"name":"Doklady Earth Sciences","volume":null,"pages":null},"PeriodicalIF":0.9,"publicationDate":"2024-04-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140625848","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-04-19DOI: 10.1134/s1028334x2460172x
M. N. Rimskaya-Korsakova, A. V. Dubinin
Abstract
Data on the vertical distribution of thiosulfate and sulfite by derivatization with monobromobimane in the water column of the Black Sea were obtained for the first time. Thiosulfate and sulfite appeared in detectable quantities below the redox interface along with the appearance of hydrogen sulfide. On the continental slope, the concentration of sulfite reaches 1.12 µM, and that of thiosulfate 0.53 µM in sea water with a potential density of 16.40–16.80 kg/m3. In the deep part of the sea at a depth of 400 m (potential density 16.96 kg/m3), the concentrations of sulfite and thiosulfate reach their maximum values of 1.74 and 0.98 µM, respectively. The comparison of data on thiosulfate obtained after filtration and without filtration showed that in the upper part of the anaerobic layer, up to 100% of thiosulfate is associated with bacterioplankton; its proportion gradually decreases to a depth of 600 m. These data and the correlation with sulfite and particulate organic carbon suggest that, in the upper part of the anaerobic zone, thiosulfate and sulfite obtained as a result of activity of chemoautotrophic bacteria are dominant.
{"title":"Vertical Distribution of Thiosulfate and Sulfite in the Black Sea","authors":"M. N. Rimskaya-Korsakova, A. V. Dubinin","doi":"10.1134/s1028334x2460172x","DOIUrl":"https://doi.org/10.1134/s1028334x2460172x","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>Data on the vertical distribution of thiosulfate and sulfite by derivatization with monobromobimane in the water column of the Black Sea were obtained for the first time. Thiosulfate and sulfite appeared in detectable quantities below the redox interface along with the appearance of hydrogen sulfide. On the continental slope, the concentration of sulfite reaches 1.12 µM, and that of thiosulfate 0.53 µM in sea water with a potential density of 16.40–16.80 kg/m<sup>3</sup>. In the deep part of the sea at a depth of 400 m (potential density 16.96 kg/m<sup>3</sup>), the concentrations of sulfite and thiosulfate reach their maximum values of 1.74 and 0.98 µM, respectively. The comparison of data on thiosulfate obtained after filtration and without filtration showed that in the upper part of the anaerobic layer, up to 100% of thiosulfate is associated with bacterioplankton; its proportion gradually decreases to a depth of 600 m. These data and the correlation with sulfite and particulate organic carbon suggest that, in the upper part of the anaerobic zone, thiosulfate and sulfite obtained as a result of activity of chemoautotrophic bacteria are dominant.</p>","PeriodicalId":11352,"journal":{"name":"Doklady Earth Sciences","volume":null,"pages":null},"PeriodicalIF":0.9,"publicationDate":"2024-04-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140625740","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-04-19DOI: 10.1134/s1028334x24601639
A. M. Panichev, N. V. Baranovskaya, I. Yu. Chekrizhov, V. V. Ivanov, A. N. Tsatska
Abstract
Several places were discovered in the mountains of the Kodar Ridge in Transbaikalia that are regularly visited by snow sheep (Ovis nivicola) for the purpose of consuming coal (Chepa Formation, Jurassic). It was registered by trap cameras that an adult ram eats from tens to hundreds of grams of coal gruss and dust at one time. The “eatable” coals were studied comprehensively, including their geochemistry. The content and balance of mobile forms of trace elements, including rare earth elements (REEs), were determined. It has been established that the sum of REEs in coal varies from 0.19 to 0.27 kg/t, which is 3.5–4 times higher than the clarke value. Elements of the light subgroup (LREEs) predominate in the REE composition. Monazite, xenotime, and rhabdophane were revealed in the consumed coals by analytical scanning electron microscopy. Acid (HCl, pH-1) extract showed that among the elements released from the coal, only a few trace elements, including LREEs, are likely to be significant to the animals. The data that we obtained from the previous landscape-geochemical studies in the areas of mass geophagy in Sikhote-Alin and Gorny Altai and on Olkhon Island (Baikal) suggest that snow sheep on the Kodar Ridge regularly consume coal due to the intention of the animals to restore a disturbed REE balance in the body.
{"title":"An Unusual Variety of Geophagy: Coal Consumption by Snow Sheep in the Transbaikalia Mountains","authors":"A. M. Panichev, N. V. Baranovskaya, I. Yu. Chekrizhov, V. V. Ivanov, A. N. Tsatska","doi":"10.1134/s1028334x24601639","DOIUrl":"https://doi.org/10.1134/s1028334x24601639","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>Several places were discovered in the mountains of the Kodar Ridge in Transbaikalia that are regularly visited by snow sheep (<i>Ovis nivicola</i>) for the purpose of consuming coal (Chepa Formation, Jurassic). It was registered by trap cameras that an adult ram eats from tens to hundreds of grams of coal gruss and dust at one time. The “eatable” coals were studied comprehensively, including their geochemistry. The content and balance of mobile forms of trace elements, including rare earth elements (REEs), were determined. It has been established that the sum of REEs in coal varies from 0.19 to 0.27 kg/t, which is 3.5–4 times higher than the clarke value. Elements of the light subgroup (LREEs) predominate in the REE composition. Monazite, xenotime, and rhabdophane were revealed in the consumed coals by analytical scanning electron microscopy. Acid (HCl, pH-1) extract showed that among the elements released from the coal, only a few trace elements, including LREEs, are likely to be significant to the animals. The data that we obtained from the previous landscape-geochemical studies in the areas of mass geophagy in Sikhote-Alin and Gorny Altai and on Olkhon Island (Baikal) suggest that snow sheep on the Kodar Ridge regularly consume coal due to the intention of the animals to restore a disturbed REE balance in the body.</p>","PeriodicalId":11352,"journal":{"name":"Doklady Earth Sciences","volume":null,"pages":null},"PeriodicalIF":0.9,"publicationDate":"2024-04-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140631131","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-04-19DOI: 10.1134/s1028334x24601688
K. E. Muryshev, A. V. Eliseev, I. I. Mokhov, A. V. Timazhev, G. P. Klimovich
Abstract
The phase shifts between the global surface temperature T and the carbon dioxide content in the atmosphere q obtained in numerical experiments with models of the Earth’s climate system under the CMIP6 project (Coupled Models Intercomparison Project, phase 6) for the period of 1850–2014 have been analyzed. According to the study results, the sign of the phase shift between q and T depends not only on the time interval analyzed, but also on the processing method of the initial series. The initial q series (with a filtered annual cycle) is ahead in phase with the corresponding T series for most models and time intervals. The first differences (inter-monthly increments) of the q series lag in phase behind the corresponding first differences of the T series by about ten months with an adequate reproduction of the results obtained by analyzing the observation data over recent decades. It means that such a delay should not be an argument against the generally accepted global warming theory related to the current increase in temperature to the dominant influence of anthropogenic greenhouse gas emissions into the atmosphere.
摘要 分析了在 CMIP6 项目（耦合模式相互比较项目，第 6 阶段）下的地球气候系统模式数值实验中获得的 1850-2014 年期间全球地表温度 T 与大气中二氧化碳含量 q 之间的相移。研究结果表明，q 和 T 之间相移的符号不仅取决于分析的时间间隔，还取决于初始序列的处理方法。在大多数模式和时间区间内，初始 q 序列（具有滤波年周期）与相应的 T 序列相位超前。q 序列的初差（月间增量）在相位上滞后于相应的 T 序列初差约 10 个月，充分再现了通过分析近几十年的观测数据所获得的结果。这意味着，这种滞后不应该成为反对普遍接受的全球变暖理论的论据，该理论认为目前的气温上升与人为温室气体排放到大气中的主要影响有关。
{"title":"The Phase Shift between the Global Surface Temperature and the CO2 Content in the Atmosphere According to Simulations with the Ensemble of CMIP6 Models","authors":"K. E. Muryshev, A. V. Eliseev, I. I. Mokhov, A. V. Timazhev, G. P. Klimovich","doi":"10.1134/s1028334x24601688","DOIUrl":"https://doi.org/10.1134/s1028334x24601688","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>The phase shifts between the global surface temperature <i>T</i> and the carbon dioxide content in the atmosphere <i>q</i> obtained in numerical experiments with models of the Earth’s climate system under the CMIP6 project (Coupled Models Intercomparison Project, phase 6) for the period of 1850–2014 have been analyzed. According to the study results, the sign of the phase shift between <i>q</i> and <i>T</i> depends not only on the time interval analyzed, but also on the processing method of the initial series. The initial <i>q</i> series (with a filtered annual cycle) is ahead in phase with the corresponding <i>T</i> series for most models and time intervals. The first differences (inter-monthly increments) of the <i>q</i> series lag in phase behind the corresponding first differences of the <i>T</i> series by about ten months with an adequate reproduction of the results obtained by analyzing the observation data over recent decades. It means that such a delay should not be an argument against the generally accepted global warming theory related to the current increase in temperature to the dominant influence of anthropogenic greenhouse gas emissions into the atmosphere.</p>","PeriodicalId":11352,"journal":{"name":"Doklady Earth Sciences","volume":null,"pages":null},"PeriodicalIF":0.9,"publicationDate":"2024-04-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140624045","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-04-19DOI: 10.1134/s1028334x24601664
I. R. Rakhimov, E. V. Pushkarev, V. S. Chervyakovskiy, S. A. Dyakova
Abstract
The first U–Pb isotope data of detrital zircon from chromite sandstones of the Middle Permian Sabantuy paleoplacer, Southern Pre-Urals, has been obtained. The distribution of U–Pb dates is unimodal with a peak at 420–400 Ma. Two-thirds of all ages are Devonian, and more than half of them correspond to the Early Devonian, during which supra-subduction ophiolitic and accompanying high-pressure metamorphic complexes were formed in the Southern Urals and ultramafic-mafic magmatism occurred. These spatially combined geological bodies, exposed in the melange zone of the Main Uralian Fault or tectonically moved to the west as ophiolite allochthons, are the main sources of detrital chromite and zircon in the Sabantuy paleoplacer.
{"title":"U–Pb Age of Detrital Zircons from the Middle Permian Sabantuy Chromite Paleoplacer (Southern Pre-Urals)","authors":"I. R. Rakhimov, E. V. Pushkarev, V. S. Chervyakovskiy, S. A. Dyakova","doi":"10.1134/s1028334x24601664","DOIUrl":"https://doi.org/10.1134/s1028334x24601664","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>The first U–Pb isotope data of detrital zircon from chromite sandstones of the Middle Permian Sabantuy paleoplacer, Southern Pre-Urals, has been obtained. The distribution of U–Pb dates is unimodal with a peak at 420–400 Ma. Two-thirds of all ages are Devonian, and more than half of them correspond to the Early Devonian, during which supra-subduction ophiolitic and accompanying high-pressure metamorphic complexes were formed in the Southern Urals and ultramafic-mafic magmatism occurred. These spatially combined geological bodies, exposed in the melange zone of the Main Uralian Fault or tectonically moved to the west as ophiolite allochthons, are the main sources of detrital chromite and zircon in the Sabantuy paleoplacer.</p>","PeriodicalId":11352,"journal":{"name":"Doklady Earth Sciences","volume":null,"pages":null},"PeriodicalIF":0.9,"publicationDate":"2024-04-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140629836","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-04-19DOI: 10.1134/s1028334x24601494
S. M. Zhmodik, A. Yu. Rozanov, E. V. Lazareva, P. O. Ivanov, D. K. Belyanin, N. S. Karmanov, V. A. Ponomarchuk, B. Yu. Saryg-ool, E. A. Zhegallo, O. S. Samylina, T. N. Moroz
Abstract
Data indicating the important role of microorganisms in the formation of nodular monazite (NM) (kularite) of the Kular Range, Republic of Sakha (Yakutia), are presented. The NM contains microorganisms (cyanobacteria) replaced by REE-bearing phosphate (monazite) in the form of stromatolitic microedifices, as well as framboidal Fe sulfides in monazite. The Corg isotopic composition of kularite corresponds to biogenic carbon: the δ13С values vary from –22.2 to –22.3‰.
{"title":"Signatures of the Involvement of Microorganisms in the Formation of Nodular Monazite (Kularite), Republic of Sakha (Yakutia), Russia","authors":"S. M. Zhmodik, A. Yu. Rozanov, E. V. Lazareva, P. O. Ivanov, D. K. Belyanin, N. S. Karmanov, V. A. Ponomarchuk, B. Yu. Saryg-ool, E. A. Zhegallo, O. S. Samylina, T. N. Moroz","doi":"10.1134/s1028334x24601494","DOIUrl":"https://doi.org/10.1134/s1028334x24601494","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>Data indicating the important role of microorganisms in the formation of nodular monazite (NM) (kularite) of the Kular Range, Republic of Sakha (Yakutia), are presented. The NM contains microorganisms (cyanobacteria) replaced by REE-bearing phosphate (monazite) in the form of stromatolitic microedifices, as well as framboidal Fe sulfides in monazite. The <i>C</i><sub>org</sub> isotopic composition of kularite corresponds to biogenic carbon: the δ<sup>13</sup>С values vary from –22.2 to –22.3‰.</p>","PeriodicalId":11352,"journal":{"name":"Doklady Earth Sciences","volume":null,"pages":null},"PeriodicalIF":0.9,"publicationDate":"2024-04-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140624043","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-04-19DOI: 10.1134/s1028334x24601317
A. V. Korsakov, D. S. Mikhailenko, A. O. Serebryannikov, A. M. Logvinova, D. P. Gladkochub
Abstract
Diamond crystals with numerous mineral inclusions from the Guanamo placer deposit (Venezuela) were studied in detail. The inclusions in the studied diamonds are represented by a set of minerals typical of eclogite paragenesis indicators—omphacite, garnet, kyanite, coesite and rutile. Besides single mineral inclusions, multiphase inclusions were also identified. Mineral associations of multiphase inclusions adjacent within less than 100 microns of each other within the same growth zone can vary considerably. For example, in one of the diamond crystals examined, multiphase inclusions are represented by the following associations: sanidine-dolomite-anatase and magnetite-rutile-dolomite-apatite-kokchetavite-graphite. Note that this is the first discovery of kokchetavite as an inclusion in kimberlite diamond crystals. Until now, this hexagonal polymorphic modification of KAlSi3O8 has only been diagnosed in minerals from rocks of the continental crust that were formed under conditions of high or ultra-high pressure metamorphism. Thus, the subduction of continental crustal material into the mantle and its important role in the metasomatic alteration of upper mantle rocks in Venezuela can be inferred from the presence of kokchetavite as inclusions in kimberlite diamond crystals.
{"title":"Inclusion of Kokchetavite in a Diamond Crystal from Venezuela: Evidence of Subduction of the Continental Crust","authors":"A. V. Korsakov, D. S. Mikhailenko, A. O. Serebryannikov, A. M. Logvinova, D. P. Gladkochub","doi":"10.1134/s1028334x24601317","DOIUrl":"https://doi.org/10.1134/s1028334x24601317","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>Diamond crystals with numerous mineral inclusions from the Guanamo placer deposit (Venezuela) were studied in detail. The inclusions in the studied diamonds are represented by a set of minerals typical of eclogite paragenesis indicators—omphacite, garnet, kyanite, coesite and rutile. Besides single mineral inclusions, multiphase inclusions were also identified. Mineral associations of multiphase inclusions adjacent within less than 100 microns of each other within the same growth zone can vary considerably. For example, in one of the diamond crystals examined, multiphase inclusions are represented by the following associations: sanidine-dolomite-anatase and magnetite-rutile-dolomite-apatite-kokchetavite-graphite. Note that this is the first discovery of kokchetavite as an inclusion in kimberlite diamond crystals. Until now, this hexagonal polymorphic modification of KAlSi<sub>3</sub>O<sub>8</sub> has only been diagnosed in minerals from rocks of the continental crust that were formed under conditions of high or ultra-high pressure metamorphism. Thus, the subduction of continental crustal material into the mantle and its important role in the metasomatic alteration of upper mantle rocks in Venezuela can be inferred from the presence of kokchetavite as inclusions in kimberlite diamond crystals.</p>","PeriodicalId":11352,"journal":{"name":"Doklady Earth Sciences","volume":null,"pages":null},"PeriodicalIF":0.9,"publicationDate":"2024-04-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140629805","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-04-10DOI: 10.1134/s1028334x24601391
M. M. Ramazanov, N. S. Bulgakova, L. I. Lobkovsky, E. M. Chuvilin, D. A. Davletshina, N. E. Shakhova
Abstract
The results of mathematical and experimental modeling of dissociation of pore methane hydrate in ice- and gas-bearing sediments with a decrease in the external pressure below equilibrium are presented. The described model of pore gas hydrate dissociation at negative temperatures, along with the experiment, makes it possible to calculate the kinetics of this process. A comparative analysis of the results is conducted. The proposed mathematical model confirms the trend of decreasing hydrate saturation of frozen soil in the form of ({{S}_{h}}sim A{{tau }^{{ - n}}}) obtained previously in experiments. These experiments have made it possible to calculate the coefficients A and n, while the mathematical modeling shows how these coefficients depend on the problem parameters. The theoretically estimated properties of the coefficient fully confirm the experimental data. The results of experimental and mathematical modeling have implications for key factors that determine the self-preservation of pore methane hydrates in frozen sediments.
{"title":"Dissociation Kinetics of Methane Hydrate in Frozen Rocks under Decreasing External Pressure: Mathematical and Experimental Modeling","authors":"M. M. Ramazanov, N. S. Bulgakova, L. I. Lobkovsky, E. M. Chuvilin, D. A. Davletshina, N. E. Shakhova","doi":"10.1134/s1028334x24601391","DOIUrl":"https://doi.org/10.1134/s1028334x24601391","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>The results of mathematical and experimental modeling of dissociation of pore methane hydrate in ice- and gas-bearing sediments with a decrease in the external pressure below equilibrium are presented. The described model of pore gas hydrate dissociation at negative temperatures, along with the experiment, makes it possible to calculate the kinetics of this process. A comparative analysis of the results is conducted. The proposed mathematical model confirms the trend of decreasing hydrate saturation of frozen soil in the form of <span>({{S}_{h}}sim A{{tau }^{{ - n}}})</span> obtained previously in experiments. These experiments have made it possible to calculate the coefficients <i>A</i> and <i>n</i>, while the mathematical modeling shows how these coefficients depend on the problem parameters. The theoretically estimated properties of the coefficient fully confirm the experimental data. The results of experimental and mathematical modeling have implications for key factors that determine the self-preservation of pore methane hydrates in frozen sediments.</p>","PeriodicalId":11352,"journal":{"name":"Doklady Earth Sciences","volume":null,"pages":null},"PeriodicalIF":0.9,"publicationDate":"2024-04-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140602546","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-04-10DOI: 10.1134/s1028334x2460141x
O. V. Bergal-Kuvikas, E. I. Gordeev, I. Yu. Koulakov
Abstract
The origin of volcanism along the Kuril–Kamchatka Island Arc (KKIA) was analyzed. Geophysical observations show variations in the slab parameters. Different widths of the volcanic belt in the northern and southern parts of the KKIA are caused by changes in the slab dip angle. The rift system of the Bussol Strait may be generated by significant changes in the slab velocity in the central segment of the KKIA. We proposed that the back-arc basin plays a predominant role in the formation of various parameters of the slab and manifestations of volcanism along the KKIA.
{"title":"The Role of the Back-arc Basin in the Formation of Slab Heterogeneity and the Origin of Volcanism in the Kuril–Kamchatka Island Arc","authors":"O. V. Bergal-Kuvikas, E. I. Gordeev, I. Yu. Koulakov","doi":"10.1134/s1028334x2460141x","DOIUrl":"https://doi.org/10.1134/s1028334x2460141x","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>The origin of volcanism along the Kuril–Kamchatka Island Arc (KKIA) was analyzed. Geophysical observations show variations in the slab parameters. Different widths of the volcanic belt in the northern and southern parts of the KKIA are caused by changes in the slab dip angle. The rift system of the Bussol Strait may be generated by significant changes in the slab velocity in the central segment of the KKIA. We proposed that the back-arc basin plays a predominant role in the formation of various parameters of the slab and manifestations of volcanism along the KKIA.</p>","PeriodicalId":11352,"journal":{"name":"Doklady Earth Sciences","volume":null,"pages":null},"PeriodicalIF":0.9,"publicationDate":"2024-04-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140578435","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-04-10DOI: 10.1134/s1028334x24601445
G. I. Dolgikh, M. A. Bolsunovskii
Abstract
By processing satellite data on the total electron content on a track between GLONASS, GPS, and ground receiving stations located in Primorsky Krai of Russia, disturbances of an electron layer with periods from 5 to 45 min, which are caused by natural atmospheric fluctuations, were identified. They affect the sea surface and are responsible for aquatic fluctuations with periods from 5 to 40 min.
{"title":"Loading Effect of the Atmosphere on the Hydrosphere","authors":"G. I. Dolgikh, M. A. Bolsunovskii","doi":"10.1134/s1028334x24601445","DOIUrl":"https://doi.org/10.1134/s1028334x24601445","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>By processing satellite data on the total electron content on a track between GLONASS, GPS, and ground receiving stations located in Primorsky Krai of Russia, disturbances of an electron layer with periods from 5 to 45 min, which are caused by natural atmospheric fluctuations, were identified. They affect the sea surface and are responsible for aquatic fluctuations with periods from 5 to 40 min.</p>","PeriodicalId":11352,"journal":{"name":"Doklady Earth Sciences","volume":null,"pages":null},"PeriodicalIF":0.9,"publicationDate":"2024-04-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140578431","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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