Pub Date : 2021-01-01DOI: 10.15407/mineraljournal.43.04.063
G. Artemenko, L. Stepanyuk, I. Samborska, B. Borodynya, I. Shvaika, K. Gogolev, L. Proskurka
In the Saltych anticlinorium of the West Azov, small intrusions of rocks of basic and ultrabasic composition are known in the middle reaches of the Obitochna, Kiltychiya and Burtychiya rivers and in the upper reaches of the Obitochna river. They are composed from amphibolized peridotites, pyroxenites, actinolithites, tremolithites, hornblendites, amphibole and other shales. These intrusions are considered "fractured intrusions", which are rooted in the already deployed rocks of the Archean age. In the stratigraphic scheme they are referred to the Novoselytske association. Intrusions break through the veins of syenites, pegmatites and aplite-like granites. Metaultrabasites, according to I.S. Usenko and G.L. Kravchenko, these are ultrabasic rocks of the normal series, which were formed, probably, because of differentiation of basaltic magma. The main and ultrabasic rocks of these intrusions have not been studied enough yet — their age, geodynamic conditions of formation have not been determined, the potential for minerals has not been fully revealed. For this purpose, we determined the microelement composition of meta-ultrabasites, metabasites and acid rocks by the ICP MS method and determined the age of monazite from veins of aplite-like granites that break through the metapyroxenites of the Kamyshuvatka intrusion. According to the obtained geochemical and mineralogical data, the vein rocks of medium and acid composition, which break through the intrusions of the ultrabasite-basite composition at the Saltych anticlinorium, have a core genesis. Zircon in them is relict, and syngenetic monazite was found only in the veins of aplite-like granites that break through the metapyroxenites of the Kamyshuvatka intrusion. According to the dating of this monazite, it has been determined that the upper age limit for the formation of intrusions of the ultrabasite-basite composition of the Novoselytske association is 2051.8±3.8 Ma. Peridotites and pyroxenites of these intrusions could be formed from melts of the depleted upper mantle, which were fractionated in intermediate magmatic chambers. In peridotites (#mg = 0.74-0.86) of the Kamyshuvatka intrusion and intrusion near the Reva farm, the Ni content (510-826 ppm) is lower than that of Clark for ultrabasic rocks, and the chromium content at the level of Clark and below it is Cr — 1250-2260 ppm. Positive anomalies of Ti and Eu indicate the processes of fractionation of the original magma of pyroxenites. The formation of intrusions of the ultrabasite-basite composition of the Saltych anticlinorium of the Azov megablock is probably connected with the activation of the Earth’s mantle about 2050 million years ago.
{"title":"Age and Geochemistry of Basite-Ultrabasite Intrusions of Saltych Anticlinorium (West Azov)","authors":"G. Artemenko, L. Stepanyuk, I. Samborska, B. Borodynya, I. Shvaika, K. Gogolev, L. Proskurka","doi":"10.15407/mineraljournal.43.04.063","DOIUrl":"https://doi.org/10.15407/mineraljournal.43.04.063","url":null,"abstract":"In the Saltych anticlinorium of the West Azov, small intrusions of rocks of basic and ultrabasic composition are known in the middle reaches of the Obitochna, Kiltychiya and Burtychiya rivers and in the upper reaches of the Obitochna river. They are composed from amphibolized peridotites, pyroxenites, actinolithites, tremolithites, hornblendites, amphibole and other shales. These intrusions are considered \"fractured intrusions\", which are rooted in the already deployed rocks of the Archean age. In the stratigraphic scheme they are referred to the Novoselytske association. Intrusions break through the veins of syenites, pegmatites and aplite-like granites. Metaultrabasites, according to I.S. Usenko and G.L. Kravchenko, these are ultrabasic rocks of the normal series, which were formed, probably, because of differentiation of basaltic magma. The main and ultrabasic rocks of these intrusions have not been studied enough yet — their age, geodynamic conditions of formation have not been determined, the potential for minerals has not been fully revealed. For this purpose, we determined the microelement composition of meta-ultrabasites, metabasites and acid rocks by the ICP MS method and determined the age of monazite from veins of aplite-like granites that break through the metapyroxenites of the Kamyshuvatka intrusion. According to the obtained geochemical and mineralogical data, the vein rocks of medium and acid composition, which break through the intrusions of the ultrabasite-basite composition at the Saltych anticlinorium, have a core genesis. Zircon in them is relict, and syngenetic monazite was found only in the veins of aplite-like granites that break through the metapyroxenites of the Kamyshuvatka intrusion. According to the dating of this monazite, it has been determined that the upper age limit for the formation of intrusions of the ultrabasite-basite composition of the Novoselytske association is 2051.8±3.8 Ma. Peridotites and pyroxenites of these intrusions could be formed from melts of the depleted upper mantle, which were fractionated in intermediate magmatic chambers. In peridotites (#mg = 0.74-0.86) of the Kamyshuvatka intrusion and intrusion near the Reva farm, the Ni content (510-826 ppm) is lower than that of Clark for ultrabasic rocks, and the chromium content at the level of Clark and below it is Cr — 1250-2260 ppm. Positive anomalies of Ti and Eu indicate the processes of fractionation of the original magma of pyroxenites. The formation of intrusions of the ultrabasite-basite composition of the Saltych anticlinorium of the Azov megablock is probably connected with the activation of the Earth’s mantle about 2050 million years ago.","PeriodicalId":53834,"journal":{"name":"Mineralogical Journal-Ukraine","volume":null,"pages":null},"PeriodicalIF":0.2,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67126842","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: 10.15407/mineraljournal.43.04.073
V. Ishkov, Ye.S. Kozii
The aim of the research is to establish the characteristics of the As and Hg distribution, which belong to the main toxic elements of coal, in the coal seam k5 of the minefield Kapitalna (Krasnoarmiiskyi geological and industrial area of Donbas) and their main genetic factors. The applied methods include sampling coal from mine workings and from core-samples duplicates of wells from 1981 to 2014; identification of the inorganic part of the coal seam, macroscopically diagnosed by standard mineralogical methods as sulfide, silicate and carbonate fractions. According to textural and structural features, they are divided into groups of syngenetic and epigenetic origin; the mineral composition of these two groups was determined by optical microscopy using MIN-8 and MBS-9 microscopes and by X-ray diffraction analysis. Fractional analysis of the density of coal from duplicates of the original samples was carried out to identify the substance of the inorganic part of the coal seam; Arsenic and Hg contents were determined by atomic absorption analysis in the substance of all initial and final samples; normalization of all values of Hg and As concentrations and technological parameters of coal; statistical processing of all geochemical information using Excel 2016 and Statistica 11.0, which included correlation and regression analysis; calculation of the coefficients of affinity of Hg and As with organic matter, the coefficients of the reduced concentration of the investigated elements, the coefficients of the reduced extraction of these elements in the fraction of different densities; construction of maps of normalized isoconcentrates; changes in the regional component of normalized content and gradient of normalized content were performed using the program Surfer 11. We found a genetic link between high concentrations of As and Hg in the coal seam k5 of the minefield Kapitalna with tectonic features, the Central overthrust and associated zones of increased fracturing. The accumulation of As and Hg in the coal seam k5 of the minefield Kapitalna, bound to the organic component of the coal seam, is epigenetic. The practical significance of the work is that their high concentration in the high-density fractions of coal will lead to their gravitational accumulation in the waste.
{"title":"Distribution of Arsene and Mercury in the Coal Seam k5 of the Kapitalna Mine, Donbas","authors":"V. Ishkov, Ye.S. Kozii","doi":"10.15407/mineraljournal.43.04.073","DOIUrl":"https://doi.org/10.15407/mineraljournal.43.04.073","url":null,"abstract":"The aim of the research is to establish the characteristics of the As and Hg distribution, which belong to the main toxic elements of coal, in the coal seam k5 of the minefield Kapitalna (Krasnoarmiiskyi geological and industrial area of Donbas) and their main genetic factors. The applied methods include sampling coal from mine workings and from core-samples duplicates of wells from 1981 to 2014; identification of the inorganic part of the coal seam, macroscopically diagnosed by standard mineralogical methods as sulfide, silicate and carbonate fractions. According to textural and structural features, they are divided into groups of syngenetic and epigenetic origin; the mineral composition of these two groups was determined by optical microscopy using MIN-8 and MBS-9 microscopes and by X-ray diffraction analysis. Fractional analysis of the density of coal from duplicates of the original samples was carried out to identify the substance of the inorganic part of the coal seam; Arsenic and Hg contents were determined by atomic absorption analysis in the substance of all initial and final samples; normalization of all values of Hg and As concentrations and technological parameters of coal; statistical processing of all geochemical information using Excel 2016 and Statistica 11.0, which included correlation and regression analysis; calculation of the coefficients of affinity of Hg and As with organic matter, the coefficients of the reduced concentration of the investigated elements, the coefficients of the reduced extraction of these elements in the fraction of different densities; construction of maps of normalized isoconcentrates; changes in the regional component of normalized content and gradient of normalized content were performed using the program Surfer 11. We found a genetic link between high concentrations of As and Hg in the coal seam k5 of the minefield Kapitalna with tectonic features, the Central overthrust and associated zones of increased fracturing. The accumulation of As and Hg in the coal seam k5 of the minefield Kapitalna, bound to the organic component of the coal seam, is epigenetic. The practical significance of the work is that their high concentration in the high-density fractions of coal will lead to their gravitational accumulation in the waste.","PeriodicalId":53834,"journal":{"name":"Mineralogical Journal-Ukraine","volume":null,"pages":null},"PeriodicalIF":0.2,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67126853","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 : 2020-11-12DOI: 10.1093/wentk/9780197532102.003.0001
S. Yekelchyk
Why did Ukraine become a key reference point of American political struggles? In recent years, Ukraine has emerged as the most prominent test case of American support for democracy and liberal economic reforms worldwide. A combination of several factors has made Ukraine and the...
{"title":"Why Ukraine?","authors":"S. Yekelchyk","doi":"10.1093/wentk/9780197532102.003.0001","DOIUrl":"https://doi.org/10.1093/wentk/9780197532102.003.0001","url":null,"abstract":"Why did Ukraine become a key reference point of American political struggles?\u0000 In recent years, Ukraine has emerged as the most prominent test case of American support for democracy and liberal economic reforms worldwide. A combination of several factors has made Ukraine and the...","PeriodicalId":53834,"journal":{"name":"Mineralogical Journal-Ukraine","volume":null,"pages":null},"PeriodicalIF":0.2,"publicationDate":"2020-11-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80004569","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 : 2020-11-12DOI: 10.1093/wentk/9780197532102.003.0002
S. Yekelchyk
What is Ukraine’s geographical location, and what natural resources and industry does it possess? Ukraine is located in southeastern Europe. Its longest land border, in the east and north, is with Russia; another northern neighbor is Belarus, a post-Soviet state and Russia’s close ally....
{"title":"The Land and the People","authors":"S. Yekelchyk","doi":"10.1093/wentk/9780197532102.003.0002","DOIUrl":"https://doi.org/10.1093/wentk/9780197532102.003.0002","url":null,"abstract":"What is Ukraine’s geographical location, and what natural resources and industry does it possess?\u0000 Ukraine is located in southeastern Europe. Its longest land border, in the east and north, is with Russia; another northern neighbor is Belarus, a post-Soviet state and Russia’s close ally....","PeriodicalId":53834,"journal":{"name":"Mineralogical Journal-Ukraine","volume":null,"pages":null},"PeriodicalIF":0.2,"publicationDate":"2020-11-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76373795","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 : 2020-01-01DOI: 10.15407/mineraljournal.42.01.076
V. Pryvalov, O. Panova, A. Pryvalov
Цитування: квасниця в.м. Імпактні алмази з неогенового розсипу самоткань (середнє Придніпров’я). Міне рал. журн. 2020. 42, No 1. с. 00—00. https://doi.org/10.15407/mineraljournal.41.04.003 : Pryvalov V.O., Panova O.A., Pryvalov а.V. Geology in Environmental Management Issues of the Donbas Within the Context of Its Forthcoming Restorat on. Mineral. Jour . (Ukrai e), 42, No. 1, Kyiv, UA, pp. 76-85. https:// doi.org/10.15407/mineraljournal.42.01.076 https://doi.org/10.15407/mineraljournal.42.01.076 uDC 658.56: 622.8.012.2:519.71 V.O. Pryvalov, DrSc (Geology), Prof., Leading Researcher M.P. Semenenko Institute of Geochemistry, Mineralogy and Ore Formation of the NAS of ukraine 34, Acad. Palladin Ave., kyiv, ukraine, 03142 E-mail: vitaliy.privalov@gmail.com http://orcid.org/0000-0002-1429-6960 O.A. Panova, PhD (Geology & Mineralogy), Senior Research Fellow, Leading Researcher. M.P. Semenenko Institute of Geochemistry, Mineralogy and Ore Formation of the NAS of ukraine 34, Acad. Palladin Ave., kyiv, ukraine, 03142 E-mail: olena.panova@gmail.com http://orcid.org/0000-0002-3813-5125 А.V. Pryvalov, BSc (Environmental Geosciences), MSc student Czech university of Life Sciences kamýcká 129, 165 00 Praha-Suchdol E-mail: andriy.privalov@gmail.com https://orcid.org/0000-0002-3045-7111
引文：Kvasnitsia V.M.从新基因染色自织物（中间）中提取的钻石。我不知道。新闻。2020. 42, No 1. C.国际合作00—00. https://doi.org/10.15407/mineraljournal.41.04.003：Pryvalov V.O.，Panova O.A.，Pryvalov A.V.Geology in Environmental Management Issues of the Donbas within the context of its forthcoming restorat on mineral.Jour . (Ukrai e), 42, No. 1, Kyiv, UA, pp. 76-85. https:// doi.org/10.15407/mineraljournal.42.01.076 https://doi.org/10.15407/mineraljournal.42.01.076 uDC 658.56: 622.8.012.2:519.71 V.O. Pryvalov, DrSc (Geology), Prof., Leading Researcher M.P. Semenenko Institute of Geochemistry, Mineralogy and Ore Formation of the NAS of ukraine 34, Acad. Palladin Ave., kyiv, ukraine, 03142 E-mail: vitaliy.privalov@gmail.com http://orcid.org/0000-0002-1429-6960 O.A. Panova, PhD (Geology & Mineralogy), Senior Research Fellow, Leading Researcher. M.P. Semenenko Institute of Geochemistry, Mineralogy and Ore Formation of the NAS of ukraine 34, Acad. Palladin Ave., kyiv, ukraine, 03142 E-mail: olena.panova@gmail.com http://orcid.org/0000-0002-3813-5125A.V.Pryvalov，BSC（Environmental Geosciences），MSC Student Czech University of Life Sciences Kamýcká129，165 00 Praha-Suchdol e-mail:andriy.privalov@gmail.com https://orcid.org/0000-0002-3045-7111
{"title":"GEOLOGY IN ENVIRONMENTAL MANAGEMENT ISSUES OF THE DONBAS WITHIN THE CONTEXT OF ITS FORTHCOMING RESTORATION","authors":"V. Pryvalov, O. Panova, A. Pryvalov","doi":"10.15407/mineraljournal.42.01.076","DOIUrl":"https://doi.org/10.15407/mineraljournal.42.01.076","url":null,"abstract":"Цитування: квасниця в.м. Імпактні алмази з неогенового розсипу самоткань (середнє Придніпров’я). Міне рал. журн. 2020. 42, No 1. с. 00—00. https://doi.org/10.15407/mineraljournal.41.04.003 : Pryvalov V.O., Panova O.A., Pryvalov а.V. Geology in Environmental Management Issues of the Donbas Within the Context of Its Forthcoming Restorat on. Mineral. Jour . (Ukrai e), 42, No. 1, Kyiv, UA, pp. 76-85. https:// doi.org/10.15407/mineraljournal.42.01.076 https://doi.org/10.15407/mineraljournal.42.01.076 uDC 658.56: 622.8.012.2:519.71 V.O. Pryvalov, DrSc (Geology), Prof., Leading Researcher M.P. Semenenko Institute of Geochemistry, Mineralogy and Ore Formation of the NAS of ukraine 34, Acad. Palladin Ave., kyiv, ukraine, 03142 E-mail: vitaliy.privalov@gmail.com http://orcid.org/0000-0002-1429-6960 O.A. Panova, PhD (Geology & Mineralogy), Senior Research Fellow, Leading Researcher. M.P. Semenenko Institute of Geochemistry, Mineralogy and Ore Formation of the NAS of ukraine 34, Acad. Palladin Ave., kyiv, ukraine, 03142 E-mail: olena.panova@gmail.com http://orcid.org/0000-0002-3813-5125 А.V. Pryvalov, BSc (Environmental Geosciences), MSc student Czech university of Life Sciences kamýcká 129, 165 00 Praha-Suchdol E-mail: andriy.privalov@gmail.com https://orcid.org/0000-0002-3045-7111","PeriodicalId":53834,"journal":{"name":"Mineralogical Journal-Ukraine","volume":null,"pages":null},"PeriodicalIF":0.2,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67124265","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 : 2020-01-01DOI: 10.15407/mineraljournal.42.03.003
V. Kvasnytsya
{"title":"Diamonds from Terrigenous Deposits of Dniester and Southern Bug River Basins","authors":"V. Kvasnytsya","doi":"10.15407/mineraljournal.42.03.003","DOIUrl":"https://doi.org/10.15407/mineraljournal.42.03.003","url":null,"abstract":"","PeriodicalId":53834,"journal":{"name":"Mineralogical Journal-Ukraine","volume":null,"pages":null},"PeriodicalIF":0.2,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67124588","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 : 2020-01-01DOI: 10.15407/mineraljournal.42.02.014
L. F. Mametova, A. Mirek, Ye.S. Kozii
{"title":"Pyritization of the Middle Carboniferous Sandstones of the Donbas","authors":"L. F. Mametova, A. Mirek, Ye.S. Kozii","doi":"10.15407/mineraljournal.42.02.014","DOIUrl":"https://doi.org/10.15407/mineraljournal.42.02.014","url":null,"abstract":"","PeriodicalId":53834,"journal":{"name":"Mineralogical Journal-Ukraine","volume":null,"pages":null},"PeriodicalIF":0.2,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67124332","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 : 2020-01-01DOI: 10.15407/mineraljournal.42.01.024
D. Voznyak, V. Syomka, V. Belskyi
{"title":"NEW ASPECTS OF FLUID INCLUSIONS application for reconstruction OF MINERAL formation PT-CONDITIONS","authors":"D. Voznyak, V. Syomka, V. Belskyi","doi":"10.15407/mineraljournal.42.01.024","DOIUrl":"https://doi.org/10.15407/mineraljournal.42.01.024","url":null,"abstract":"","PeriodicalId":53834,"journal":{"name":"Mineralogical Journal-Ukraine","volume":null,"pages":null},"PeriodicalIF":0.2,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67124160","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 : 2020-01-01DOI: 10.15407/mineraljournal.42.01.066
L. Stepanyuk, O. Vysotsky, T. Dovbush, O. Bilan, N. A. Kovalenko
{"title":"GEOCHRONOLOGY OF MAGMATIC ROCKS OF OSNITSK BLOCK (UKRAINIAN SHIELD) ON ZIRCON AND TITANITE","authors":"L. Stepanyuk, O. Vysotsky, T. Dovbush, O. Bilan, N. A. Kovalenko","doi":"10.15407/mineraljournal.42.01.066","DOIUrl":"https://doi.org/10.15407/mineraljournal.42.01.066","url":null,"abstract":"","PeriodicalId":53834,"journal":{"name":"Mineralogical Journal-Ukraine","volume":null,"pages":null},"PeriodicalIF":0.2,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67124221","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 : 2020-01-01DOI: 10.15407/mineraljournal.42.04.069
O. Mytrokhyn, V. Bakhmutov, A. Aleksieienko, T. Mytrokhina
The Anagram Islands are located near the Graham Coast of West Antarctica not far from the Ukrainian Antarctic Station "Akademik Vernadsky". Gabbroids that are probably Cretaceous in age predominate in the geological structure of the Anagram Islands. New data on the mode of occurrence of the Anagram gabbroids and their layering were obtained during the seasonal field works of the Ukrainian Antarctic Expeditions in 2017, 2019-2020 years. Samples of the gabbroids were examined by optical microscopy, electron microscopy and microprobe analysis as well as by measuring of anisotropy of magnetic susceptibility of rocks. The goal of the research was to clarify the geological position and petrographic features of the Anagram gabbroids, to determine the typomorphic features of rock-forming minerals, and to clarify the origin of the layering in gabbroids. It was determined that the bottom part of a large layered gabbroid intrusion is fragmentarily exposed on the Anagram Islands. The continuation of the intrusion is expected in the northeastern and southeastern directions. It was established that primary magmatic textures and mineral composition are preserved in the gabbroids despite the development of metamorphic amphibolization. The gabbroids show typical cumulative textures of magmatic origin. The main cumulative phases are plagioclase (An70-95), clinopyroxene (Wo41-49En34-47), orthopyroxene (Wo2-4En49-71), olivine (Fo67-69), Ti-magnetite and ilmenite. It is proved that the fine rhythmic-gradational layering in the gabbroids was formed by gravitational precipitation of the cumulative minerals on the bottom of the magma chamber and their further sorting by specific gravity due to convection currents. Cryptic layering is firstly discovered in the Anagram gabbroids and is explained by the processes of crystallization differentiation. The latter caused the accumulation of the most calcium plagioclases and the most magnesian mafic minerals in the layered gabbroids forming the bottom part of the intrusion. The present subvertical position of layering is explained by tectonic deformation that resulted in the tilting of the investigated section of the Anagram gabbroid intrusion. This confirmed by the studying of magnetic texture of the gabbroids (by the anisotropy of magnetic susceptibility data).
{"title":"The Petrology of Gabbroids of the Anagram Islands (Wilhelm Archipelago, West Antarctica)","authors":"O. Mytrokhyn, V. Bakhmutov, A. Aleksieienko, T. Mytrokhina","doi":"10.15407/mineraljournal.42.04.069","DOIUrl":"https://doi.org/10.15407/mineraljournal.42.04.069","url":null,"abstract":"The Anagram Islands are located near the Graham Coast of West Antarctica not far from the Ukrainian Antarctic Station \"Akademik Vernadsky\". Gabbroids that are probably Cretaceous in age predominate in the geological structure of the Anagram Islands. New data on the mode of occurrence of the Anagram gabbroids and their layering were obtained during the seasonal field works of the Ukrainian Antarctic Expeditions in 2017, 2019-2020 years. Samples of the gabbroids were examined by optical microscopy, electron microscopy and microprobe analysis as well as by measuring of anisotropy of magnetic susceptibility of rocks. The goal of the research was to clarify the geological position and petrographic features of the Anagram gabbroids, to determine the typomorphic features of rock-forming minerals, and to clarify the origin of the layering in gabbroids. It was determined that the bottom part of a large layered gabbroid intrusion is fragmentarily exposed on the Anagram Islands. The continuation of the intrusion is expected in the northeastern and southeastern directions. It was established that primary magmatic textures and mineral composition are preserved in the gabbroids despite the development of metamorphic amphibolization. The gabbroids show typical cumulative textures of magmatic origin. The main cumulative phases are plagioclase (An70-95), clinopyroxene (Wo41-49En34-47), orthopyroxene (Wo2-4En49-71), olivine (Fo67-69), Ti-magnetite and ilmenite. It is proved that the fine rhythmic-gradational layering in the gabbroids was formed by gravitational precipitation of the cumulative minerals on the bottom of the magma chamber and their further sorting by specific gravity due to convection currents. Cryptic layering is firstly discovered in the Anagram gabbroids and is explained by the processes of crystallization differentiation. The latter caused the accumulation of the most calcium plagioclases and the most magnesian mafic minerals in the layered gabbroids forming the bottom part of the intrusion. The present subvertical position of layering is explained by tectonic deformation that resulted in the tilting of the investigated section of the Anagram gabbroid intrusion. This confirmed by the studying of magnetic texture of the gabbroids (by the anisotropy of magnetic susceptibility data).","PeriodicalId":53834,"journal":{"name":"Mineralogical Journal-Ukraine","volume":null,"pages":null},"PeriodicalIF":0.2,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67125903","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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