Pub Date : 2021-01-01DOI: 10.30730/gtrz.2021.5.4.346-353
S. Elokhina, T.S. Myznikova, A. Khudyakov
13 genetic types of dangerous exogenous geological processes (EGP) have been developed on the territory of the Ural Federal District (UFD). This work aims to illustrate the system of accounting and accumulating information on the manifestations of dangerous EGPs of each genetic type. When conducting the state monitoring of the subsurface state (SMSS), the information about the EGP manifestations is accumulated in the structured data arrays (SDAs), which are organized for each subject of the Russian Federation within the UFD. The sources of information are the results of areal regular and one-time engineering and geological surveys, materials from official open and stock sources. On the basis of accumulated data, we have concluded that the most common genetic types of dangerous EGPs in the UFD territory are gully erosion (28.4 %) and karst-suffusion process (21.5 %), which make up about half of the total number of all recorded manifestations. The operation of the information and analytical base of the SMSS EGP allows to perform accounting, analytical (including the identification of patterns of EGP development for a selected time interval), reporting and statistical functions, increases the reliability of seasonal and annual forecasts.
{"title":"State of the information and analytic database of exogenous geological processes on the territory of the Ural Federal District","authors":"S. Elokhina, T.S. Myznikova, A. Khudyakov","doi":"10.30730/gtrz.2021.5.4.346-353","DOIUrl":"https://doi.org/10.30730/gtrz.2021.5.4.346-353","url":null,"abstract":"13 genetic types of dangerous exogenous geological processes (EGP) have been developed on the territory of the Ural Federal District (UFD). This work aims to illustrate the system of accounting and accumulating information on the manifestations of dangerous EGPs of each genetic type. When conducting the state monitoring of the subsurface state (SMSS), the information about the EGP manifestations is accumulated in the structured data arrays (SDAs), which are organized for each subject of the Russian Federation within the UFD. The sources of information are the results of areal regular and one-time engineering and geological surveys, materials from official open and stock sources. On the basis of accumulated data, we have concluded that the most common genetic types of dangerous EGPs in the UFD territory are gully erosion (28.4 %) and karst-suffusion process (21.5 %), which make up about half of the total number of all recorded manifestations. The operation of the information and analytical base of the SMSS EGP allows to perform accounting, analytical (including the identification of patterns of EGP development for a selected time interval), reporting and statistical functions, increases the reliability of seasonal and annual forecasts.","PeriodicalId":34500,"journal":{"name":"Geosistemy perekhodnykh zon","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"69578855","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 : 2021-01-01DOI: 10.30730/gtrz.2021.5.4.354-360
A. Degterev, M. Chibisova, R. Zharkov
This communication, based on satellite data and the results of visual observations, considers the main features of the activity of Chirinkotan and Sarychev Peak volcanoes in 2021. In the period from August 8 to 23, 2021, a moderate explosive eruption of Chirinkotan volcano took place. During this time, 11 volcanic explosions were recorded at an altitude of 1.5 to 4.5 km a.s.l. The parameters of the 2021 eruption were similar to previous eruptions in 2013–2015, 2016, 2017. At Sarychev Peak volcano on June 29, July 1, August 6 and November 26 of 2021 single relatively weak ejections to an altitude of about 2.2–3 km a.s.l. were recorded. Current activity of the volcano is associated with a recent effusive eruption that has taken place from December 2020 to February 2021, in which result a crater and mouth of the volcano turned out to be sealed with lava.
{"title":"Activity of Chirinkotan and Sarychev Peak volcanoes in 2021 (Kuril Islands)","authors":"A. Degterev, M. Chibisova, R. Zharkov","doi":"10.30730/gtrz.2021.5.4.354-360","DOIUrl":"https://doi.org/10.30730/gtrz.2021.5.4.354-360","url":null,"abstract":"This communication, based on satellite data and the results of visual observations, considers the main features of the activity of Chirinkotan and Sarychev Peak volcanoes in 2021. In the period from August 8 to 23, 2021, a moderate explosive eruption of Chirinkotan volcano took place. During this time, 11 volcanic explosions were recorded at an altitude of 1.5 to 4.5 km a.s.l. The parameters of the 2021 eruption were similar to previous eruptions in 2013–2015, 2016, 2017. At Sarychev Peak volcano on June 29, July 1, August 6 and November 26 of 2021 single relatively weak ejections to an altitude of about 2.2–3 km a.s.l. were recorded. Current activity of the volcano is associated with a recent effusive eruption that has taken place from December 2020 to February 2021, in which result a crater and mouth of the volcano turned out to be sealed with lava.","PeriodicalId":34500,"journal":{"name":"Geosistemy perekhodnykh zon","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"69578864","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 : 2021-01-01DOI: 10.30730/gtrz.2021.5.2.138-145.145-152
L. Bogomolov, V. Sychev
Seismic activation in the period of foreshocks (prior to the mainshock) described by the model of self-developing processes (SDP) is possibly a manifestation of explosive instability of low frequency straining waves in metastable medium. To highlight so nontrivial relationship of continuous wave motions and discrete seismic events flow is a goal of this narrative. Thus, the rationale of the SDP model (the equation, in reality) has been modified, which is of importance in relevance with the article by the Malyshevs in the current issue (A.I. Malyshev, L.K. Malysheva. Precedent-extrapolation estimate of the seismic hazard in the Sakhalin and South Kurils region) which is to improve the seismic hazard estimates by means of this model. A new way to reveal the very beginning of blow-up regime after quasi-stationary one is proposed.
{"title":"Fundamental for self-developing processes model and problems of its application to earthquakes prediction in the Far East region","authors":"L. Bogomolov, V. Sychev","doi":"10.30730/gtrz.2021.5.2.138-145.145-152","DOIUrl":"https://doi.org/10.30730/gtrz.2021.5.2.138-145.145-152","url":null,"abstract":"Seismic activation in the period of foreshocks (prior to the mainshock) described by the model of self-developing processes (SDP) is possibly a manifestation of explosive instability of low frequency straining waves in metastable medium. To highlight so nontrivial relationship of continuous wave motions and discrete seismic events flow is a goal of this narrative. Thus, the rationale of the SDP model (the equation, in reality) has been modified, which is of importance in relevance with the article by the Malyshevs in the current issue (A.I. Malyshev, L.K. Malysheva. Precedent-extrapolation estimate of the seismic hazard in the Sakhalin and South Kurils region) which is to improve the seismic hazard estimates by means of this model. A new way to reveal the very beginning of blow-up regime after quasi-stationary one is proposed.","PeriodicalId":34500,"journal":{"name":"Geosistemy perekhodnykh zon","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"69578511","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 : 2021-01-01DOI: 10.30730/gtrz.2021.5.3.275-286
V. V. Zhigulev, D. Jsc, A. V. Zhigulev
The model of geological evolution of an interarc basin, which is the north-east ending of Mid Kuril trough located on the continental slope of Kuril-Kamchatka trench, was constructed. Seismic facies analysis was first applied to define sedimentation conditions in a deep water trench. The analysis was based on the 2D CDP reflection seismic data obtained by Dalmorneftegeophysica JSC in 2014. According to the modeling results, the basin began to form in the Late Cretaceous and passed several stages. Initial subsidence of a local crust area of the incipient basin changed over to its further separation from the adjacent waters of the Sea of Okhotsk and Pacific Ocean by various volcanic formations framing its contour. The basin waters and the Pacific Ocean waters merged as a result of subsidence and submersion of volcanic structures on the east basin framing at the final stage during the Oligocene-Middle Miocene. This subsidence is directly related to the global processes associated with Kuril-Kamchatka ocean trench appearance such as inherent crust subsidence along valley bottom line accompanied by increase in inclination angle of its flanks. It was concluded that the trench origination time approximately corresponds to the Oligocene-Middle Miocene boundary.
{"title":"Geological evolution of the northern Mid Kuril trough based on seismic facies analysis","authors":"V. V. Zhigulev, D. Jsc, A. V. Zhigulev","doi":"10.30730/gtrz.2021.5.3.275-286","DOIUrl":"https://doi.org/10.30730/gtrz.2021.5.3.275-286","url":null,"abstract":"The model of geological evolution of an interarc basin, which is the north-east ending of Mid Kuril trough located on the continental slope of Kuril-Kamchatka trench, was constructed. Seismic facies analysis was first applied to define sedimentation conditions in a deep water trench. The analysis was based on the 2D CDP reflection seismic data obtained by Dalmorneftegeophysica JSC in 2014. According to the modeling results, the basin began to form in the Late Cretaceous and passed several stages. Initial subsidence of a local crust area of the incipient basin changed over to its further separation from the adjacent waters of the Sea of Okhotsk and Pacific Ocean by various volcanic formations framing its contour. The basin waters and the Pacific Ocean waters merged as a result of subsidence and submersion of volcanic structures on the east basin framing at the final stage during the Oligocene-Middle Miocene. This subsidence is directly related to the global processes associated with Kuril-Kamchatka ocean trench appearance such as inherent crust subsidence along valley bottom line accompanied by increase in inclination angle of its flanks. It was concluded that the trench origination time approximately corresponds to the Oligocene-Middle Miocene boundary.","PeriodicalId":34500,"journal":{"name":"Geosistemy perekhodnykh zon","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"69578740","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 : 2021-01-01DOI: 10.30730/gtrz.2021.5.2.128-132.133-137
M. Rodkin
Not so many issues, that have such a divergence of view, as on the existence and nature of foreshock activation. The range here is from public admission, that the previously described effect of foreshock avalanche-like activation is nothing more than the result of (though unconscious) data fitting, to the cases of incredibly accurate predictions of the time of strong earthquakes (though retrospective). The article by A.I. Malyshev and L.K. Malysheva, published in the current issue, gave a reason to return to these disagreements again and to offer a possible explanation for them.
{"title":"On the foreshock cascade and extraordinary forecasts in connection with the article by A.I. Malyshev and L.K. Malysheva “Precedent-extrapolation estimate of the seismic hazard in the Sakhalin and the Southern Kurils region”","authors":"M. Rodkin","doi":"10.30730/gtrz.2021.5.2.128-132.133-137","DOIUrl":"https://doi.org/10.30730/gtrz.2021.5.2.128-132.133-137","url":null,"abstract":"Not so many issues, that have such a divergence of view, as on the existence and nature of foreshock activation. The range here is from public admission, that the previously described effect of foreshock avalanche-like activation is nothing more than the result of (though unconscious) data fitting, to the cases of incredibly accurate predictions of the time of strong earthquakes (though retrospective). The article by A.I. Malyshev and L.K. Malysheva, published in the current issue, gave a reason to return to these disagreements again and to offer a possible explanation for them.","PeriodicalId":34500,"journal":{"name":"Geosistemy perekhodnykh zon","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"69578453","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 : 2021-01-01DOI: 10.30730/gtrz.2021.5.4.428-438
V. Kaganov, A. V. Kordyukov, A. K. Ezhkin
The results of research of epiphytic lichens as bioindicators of the atmosphere pollution in Yuzhno-Sakhalinsk city and its suburbs are reported. Populus maximowiczii was chosen as the most common tree species in the plantings of the city as a lichen substrate. Control sites was chosen in natural habitats of Populus maximowiczii in surroundings of the city. In total, 47 lichen species were registered on bark of Populus maximowiczii on all sites. Three clusters of anthropogenic influence on lichens were defined by the results of the cluster analysis of 15 stations where species composition and occurrence frequency were registered. Four groups of lichen sensitivity to anthropogenic influence were identified according to confinement to these three clusters. The analysis of species distribution by the degree of sensitivity was made for each site.
{"title":"Distribution features of epiphytic lichens on Populus maximowiczii in Yuzhno-Sakhalinsk city and its suburbs","authors":"V. Kaganov, A. V. Kordyukov, A. K. Ezhkin","doi":"10.30730/gtrz.2021.5.4.428-438","DOIUrl":"https://doi.org/10.30730/gtrz.2021.5.4.428-438","url":null,"abstract":"The results of research of epiphytic lichens as bioindicators of the atmosphere pollution in Yuzhno-Sakhalinsk city and its suburbs are reported. Populus maximowiczii was chosen as the most common tree species in the plantings of the city as a lichen substrate. Control sites was chosen in natural habitats of Populus maximowiczii in surroundings of the city. In total, 47 lichen species were registered on bark of Populus maximowiczii on all sites. Three clusters of anthropogenic influence on lichens were defined by the results of the cluster analysis of 15 stations where species composition and occurrence frequency were registered. Four groups of lichen sensitivity to anthropogenic influence were identified according to confinement to these three clusters. The analysis of species distribution by the degree of sensitivity was made for each site.","PeriodicalId":34500,"journal":{"name":"Geosistemy perekhodnykh zon","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"69578470","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 : 2021-01-01DOI: 10.30730/gtrz.2021.5.2.167-171
A. Degterev
This publication, based on remote sensing data, examines the features of the effusive eruption of the Sarychev Peak volcano (Matua Isl., the Central Kuril Islands), which took place from December 2020 till February 2021. On the basis of the analysis of the Sentinel satellite data, it was established that starting from December 2020, the crater of the Sarychev Peak volcano began to fill with lava. As of January 18, 2021, it was completely filled, then lava outpouring through a fissure in the north-northwest part began. A lava flow (length 2 km, width 80–90 m) descended along the bottom of the valley, which cuts the northwestern slope of the volcanic cone. The outpouring of lava was completed by February 7, 2021. The effusive eruption of the Sarychev Peak volcano in 2020–2021 is atypical for the modern stage of eruptive history, characterized mainly by explosive and explosive-effusive type of eruptions.
{"title":"Activation of the Sarychev Peak volcano in 2020–2021 (Matua Isl., the Central Kuril Islands)","authors":"A. Degterev","doi":"10.30730/gtrz.2021.5.2.167-171","DOIUrl":"https://doi.org/10.30730/gtrz.2021.5.2.167-171","url":null,"abstract":"This publication, based on remote sensing data, examines the features of the effusive eruption of the Sarychev Peak volcano (Matua Isl., the Central Kuril Islands), which took place from December 2020 till February 2021. On the basis of the analysis of the Sentinel satellite data, it was established that starting from December 2020, the crater of the Sarychev Peak volcano began to fill with lava. As of January 18, 2021, it was completely filled, then lava outpouring through a fissure in the north-northwest part began. A lava flow (length 2 km, width 80–90 m) descended along the bottom of the valley, which cuts the northwestern slope of the volcanic cone. The outpouring of lava was completed by February 7, 2021. The effusive eruption of the Sarychev Peak volcano in 2020–2021 is atypical for the modern stage of eruptive history, characterized mainly by explosive and explosive-effusive type of eruptions.","PeriodicalId":34500,"journal":{"name":"Geosistemy perekhodnykh zon","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"69578554","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 : 2021-01-01DOI: 10.30730/gtrz.2021.5.1.067-071
V. S. Nikonov
An algorithm was developed to automate processing of large datasets of Earth remote sensing. The algorithm was developed and implemented in the form of an M-Processor program in the Python programming language using the modules of the ArcGIS Desktop 10.2 software, which allows complex calculations without spending additional time on programming and reduces the number of manipulations for calculating separate desired characteristics. The implementation of the developed algorithm is considered on the example of calculating the numerical characteristics of the ice area in the Sea of Okhotsk according to the data of the Multisensor Analyzed Sea Ice Extent – Northern Hemisphere (MASIE-NH) with a spatial resolution of 1 and 4 km and an ice-cover zoning mask.
{"title":"An algorithm for processing ice areas by Earth remote sensing data (by the example of MASIE-NH data)","authors":"V. S. Nikonov","doi":"10.30730/gtrz.2021.5.1.067-071","DOIUrl":"https://doi.org/10.30730/gtrz.2021.5.1.067-071","url":null,"abstract":"An algorithm was developed to automate processing of large datasets of Earth remote sensing. The algorithm was developed and implemented in the form of an M-Processor program in the Python programming language using the modules of the ArcGIS Desktop 10.2 software, which allows complex calculations without spending additional time on programming and reduces the number of manipulations for calculating separate desired characteristics. The implementation of the developed algorithm is considered on the example of calculating the numerical characteristics of the ice area in the Sea of Okhotsk according to the data of the Multisensor Analyzed Sea Ice Extent – Northern Hemisphere (MASIE-NH) with a spatial resolution of 1 and 4 km and an ice-cover zoning mask.","PeriodicalId":34500,"journal":{"name":"Geosistemy perekhodnykh zon","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"69578430","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 : 2021-01-01DOI: 10.30730/gtrz.2021.5.4.439-447
I. Krasnyuk, A. Zabolotin
A "single-phase" model of melt crystallization in the Penrose–Fife representation for temperature distributions under non-isothermal conditions is considered. The boundary conditions are assumed to be nonlinear and dynamic, i.e. they characterize the relaxation rate of the surface order parameter. In this case, the boundary conditions depend on the frequency of new phase nucleation and the rate of a melt crystallization in the (near-)surface layers of the mold. A method is proposed for predicting the appearance of ordered spatiotemporal (quasi-)crystalline structures of the fractal type of the crystalline phase in a liquid melt. The surface order parameter determines the mechanical and deformation properties of the sample depending on the temperature of the solid.
{"title":"Deterministic and stochastic oscillations of fractal type during cooling of the melt","authors":"I. Krasnyuk, A. Zabolotin","doi":"10.30730/gtrz.2021.5.4.439-447","DOIUrl":"https://doi.org/10.30730/gtrz.2021.5.4.439-447","url":null,"abstract":"A \"single-phase\" model of melt crystallization in the Penrose–Fife representation for temperature distributions under non-isothermal conditions is considered. The boundary conditions are assumed to be nonlinear and dynamic, i.e. they characterize the relaxation rate of the surface order parameter. In this case, the boundary conditions depend on the frequency of new phase nucleation and the rate of a melt crystallization in the (near-)surface layers of the mold. A method is proposed for predicting the appearance of ordered spatiotemporal (quasi-)crystalline structures of the fractal type of the crystalline phase in a liquid melt. The surface order parameter determines the mechanical and deformation properties of the sample depending on the temperature of the solid.","PeriodicalId":34500,"journal":{"name":"Geosistemy perekhodnykh zon","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"69578480","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 : 2021-01-01DOI: 10.30730/gtrz.2021.5.3.255-274
S. Rasskazov, A. V. Rybin, A. Degterev, I. Chuvashova, T. Yasnygina, E. Saranina
Adakite-like geochemical signature (high Sr/Y ratio at a low Y concentration) is recognized in andesites and dacites, associated with intraplate basalts in the Orlov volcanic field of Sakhalin Island. These rocks denote the final (Pliocene) accent of intraplate volcanism in the Lesogorsk zone, which began in the Middle Miocene in an area of its junction with the Chekhov zone of the preceded (Oligocene-Early Miocene) suprasubduction one. The adakite-like accent was related to the Sakhalin folding phase that accompanied the general structural reorganization in the back-side region in the Japan arc system. Such a geological environment differed from the one of classical adakites generation resulted from melting of a young slab in the Aleutian island arc. It is supposed, that the Sakhalin adakite-like magmas were produced in deep-seated sources of the crust-mantle transition displayed in the Sakhalin-Hokkaido-Japan Sea zone of hot transtension due to drastic change of tectonic deformations from the thin crust of the South Tatar Basin to the thicker one of its northeastern extremity.
{"title":"Pliocene adakite-like accent of andesites and dacites from the Orlov volcanic field (Sakhalin Island)","authors":"S. Rasskazov, A. V. Rybin, A. Degterev, I. Chuvashova, T. Yasnygina, E. Saranina","doi":"10.30730/gtrz.2021.5.3.255-274","DOIUrl":"https://doi.org/10.30730/gtrz.2021.5.3.255-274","url":null,"abstract":"Adakite-like geochemical signature (high Sr/Y ratio at a low Y concentration) is recognized in andesites and dacites, associated with intraplate basalts in the Orlov volcanic field of Sakhalin Island. These rocks denote the final (Pliocene) accent of intraplate volcanism in the Lesogorsk zone, which began in the Middle Miocene in an area of its junction with the Chekhov zone of the preceded (Oligocene-Early Miocene) suprasubduction one. The adakite-like accent was related to the Sakhalin folding phase that accompanied the general structural reorganization in the back-side region in the Japan arc system. Such a geological environment differed from the one of classical adakites generation resulted from melting of a young slab in the Aleutian island arc. It is supposed, that the Sakhalin adakite-like magmas were produced in deep-seated sources of the crust-mantle transition displayed in the Sakhalin-Hokkaido-Japan Sea zone of hot transtension due to drastic change of tectonic deformations from the thin crust of the South Tatar Basin to the thicker one of its northeastern extremity.","PeriodicalId":34500,"journal":{"name":"Geosistemy perekhodnykh zon","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"69578706","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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