Pub Date : 2019-12-19DOI: 10.30695/zrmo/2019.1486.05
M. Morozov, Морозов Михаил Владимирович
{"title":"Report on the Russian Mineralogical Society activities in 2018","authors":"M. Morozov, Морозов Михаил Владимирович","doi":"10.30695/zrmo/2019.1486.05","DOIUrl":"https://doi.org/10.30695/zrmo/2019.1486.05","url":null,"abstract":"","PeriodicalId":36969,"journal":{"name":"Zapiski Rossiiskogo Mineralogicheskogo Obshchestva","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-12-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43123818","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 : 2019-12-19DOI: 10.30695/zrmo/2019.1486.00
A. Askhabov, Асхабов Асхаб Магомедович
Peculiarities of the non-classical mechanism of the crystal nucleation, associated with the formation of stable prenucleus intermediate phase clusters in a crystal-forming medium, are considered. These clusters (quatarons) represent primary protomineral particles for which crystallization is one of the possible evolutionary scenarios. Conditions of the quataron formation and their characteristic properties are discussed. The relevance of experiments on direct observation of prenucleus clusters and other objects of the protomineral world is presented.
{"title":"Pre-nucleation clusters and non-classical crystal formation","authors":"A. Askhabov, Асхабов Асхаб Магомедович","doi":"10.30695/zrmo/2019.1486.00","DOIUrl":"https://doi.org/10.30695/zrmo/2019.1486.00","url":null,"abstract":"Peculiarities of the non-classical mechanism of the crystal nucleation, associated with the formation of stable prenucleus intermediate phase clusters in a crystal-forming medium, are considered. These clusters (quatarons) represent primary protomineral particles for which crystallization is one of the possible evolutionary scenarios. Conditions of the quataron formation and their characteristic properties are discussed. The relevance of experiments on direct observation of prenucleus clusters and other objects of the protomineral world is presented.","PeriodicalId":36969,"journal":{"name":"Zapiski Rossiiskogo Mineralogicheskogo Obshchestva","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-12-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46291159","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 : 2019-12-19DOI: 10.30695/zrmo/2019.1486.01
Valeriy R. Vetrin, Ветрин Валерий Романович, E. Belousova, А Белоусова Елена
This study examines zircon from the alkaline and nepheline syenites of the Sakharjok massif magmatic (2.645 ± 7 Ma), hydrothermal (1.832 ± 7 Ma) and metamorphic (1.784 ± 22 Ma) stages. Zircon from the alkaline syenites shows lower ɛHf and ɛNd values compared to that from ocean island basalts (OIB) suggesting their mantle-derived prololiths, are close to the CHUR in terms of isotopic composition. It is assumed that the formation of the Neoarchean alkaline Keivy province resulted from the plume-lithospheric interaction triggered by the uplift of a Neoarchean plume that stipulated the processes of metasomatic alterations and subsequent partial melting of the subcratonic lithospheric mantle and crustal rocks. The initial melts of the Sakharjok massif could probably form during the reactivation of the plume activity that occurred 20—30 million years after the emplacement of alkaline granites of the province by selective melting of the metasomatized lithospheric mantle rocks.
{"title":"PDF (RUS) Lu-Hf isotope composition of zircon from syenites of the Sakharjok alkaline massif, Kola Peninsula","authors":"Valeriy R. Vetrin, Ветрин Валерий Романович, E. Belousova, А Белоусова Елена","doi":"10.30695/zrmo/2019.1486.01","DOIUrl":"https://doi.org/10.30695/zrmo/2019.1486.01","url":null,"abstract":"This study examines zircon from the alkaline and nepheline syenites of the Sakharjok massif magmatic (2.645 ± 7 Ma), hydrothermal (1.832 ± 7 Ma) and metamorphic (1.784 ± 22 Ma) stages. Zircon from the alkaline syenites shows lower ɛHf and ɛNd values compared to that from ocean island basalts (OIB) suggesting their mantle-derived prololiths, are close to the CHUR in terms of isotopic composition. It is assumed that the formation of the Neoarchean alkaline Keivy province resulted from the plume-lithospheric interaction triggered by the uplift of a Neoarchean plume that stipulated the processes of metasomatic alterations and subsequent partial melting of the subcratonic lithospheric mantle and crustal rocks. The initial melts of the Sakharjok massif could probably form during the reactivation of the plume activity that occurred 20—30 million years after the emplacement of alkaline granites of the province by selective melting of the metasomatized lithospheric mantle rocks.","PeriodicalId":36969,"journal":{"name":"Zapiski Rossiiskogo Mineralogicheskogo Obshchestva","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-12-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47611413","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 : 2019-12-19DOI: 10.30695/zrmo/2019.1486.06
A. Askhabov, Асхабов Асхаб Магомедович, O. Kotova, Котова Ольга Борисовна
The article is devoted to the results of the 14th International Congress for Applied Mineralogy (IСАМ 2019) hosted at the V. G. Shukhov Belgorod State Technological University September 23-27, 2019, Belgorod. The Congress became an important milestone in the history of the Commission for Applied Mineralogy of the International Mineralogical Association (IMA-CAM), determined a vector for the development of priority scientific areas, effective links between science and business in the base of the innovative economies of the world's regions, consolidated position of Russia as one of the leading countries in the field of Applied Mineralogy.
本文致力于2019年9月23日至27日在别尔哥罗德的V. G. Shukhov别尔哥罗德国立技术大学举办的第14届国际应用矿物学大会(IСАМ 2019)的结果。大会成为国际矿物学协会(IMA-CAM)应用矿物学委员会历史上的一个重要里程碑，确定了优先科学领域发展的矢量，在世界各地区创新经济的基础上有效地联系了科学与商业，巩固了俄罗斯作为应用矿物学领域领先国家之一的地位。
{"title":"Horizons of applied mineralogy","authors":"A. Askhabov, Асхабов Асхаб Магомедович, O. Kotova, Котова Ольга Борисовна","doi":"10.30695/zrmo/2019.1486.06","DOIUrl":"https://doi.org/10.30695/zrmo/2019.1486.06","url":null,"abstract":"The article is devoted to the results of the 14th International Congress for Applied Mineralogy (IСАМ 2019) hosted at the V. G. Shukhov Belgorod State Technological University September 23-27, 2019, Belgorod. The Congress became an important milestone in the history of the Commission for Applied Mineralogy of the International Mineralogical Association (IMA-CAM), determined a vector for the development of priority scientific areas, effective links between science and business in the base of the innovative economies of the world's regions, consolidated position of Russia as one of the leading countries in the field of Applied Mineralogy.","PeriodicalId":36969,"journal":{"name":"Zapiski Rossiiskogo Mineralogicheskogo Obshchestva","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-12-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46461615","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 : 2019-12-19DOI: 10.30695/zrmo/2019.1486.04
Mariya N. Logunova, Логунова Мария Николаевна, Yu. L. Voytekhovsky, Ю Л Войтеховский, E. Kotova, Е Л Котова
The article is devoted to the 250 th anniversary of Alexander von Humboldt, Honorary Member of the Russian Mineralogical Society, and the 190 th anniversary of his travel to the Urals, Western Siberia and Altai. For the first time, the paper presents archival documents related to the visit of A. von Humboldt, G. Rose, and Ch. Ehrenberg to the Mining Cadet Corps in St. Petersburg and donating a mineralogical collection (252 samples) assembled during the expedition to Russia in 1829 to the Mining Museum. Scientific works, the discovery of new minerals, and the establishment of strong scientific and cultural ties between the oldest educational institutions in Berlin, Freiberg, and St. Petersburg were the important results of this trip. For several decades, the scientific results of the expedition were published in the journal of the Mining Cadet Corps — the Gornyi Zhurnal. The tradition of donation and exchange of collections connected the history of the Mining Museum and many natural science museums in Europe.
{"title":"On the 250th anniversary of A. von Humboldt and the 190th anniversary of his expedition to Russia","authors":"Mariya N. Logunova, Логунова Мария Николаевна, Yu. L. Voytekhovsky, Ю Л Войтеховский, E. Kotova, Е Л Котова","doi":"10.30695/zrmo/2019.1486.04","DOIUrl":"https://doi.org/10.30695/zrmo/2019.1486.04","url":null,"abstract":"The article is devoted to the 250 th anniversary of Alexander von Humboldt, Honorary Member of the Russian Mineralogical Society, and the 190 th anniversary of his travel to the Urals, Western Siberia and Altai. For the first time, the paper presents archival documents related to the visit of A. von Humboldt, G. Rose, and Ch. Ehrenberg to the Mining Cadet Corps in St. Petersburg and donating a mineralogical collection (252 samples) assembled during the expedition to Russia in 1829 to the Mining Museum. Scientific works, the discovery of new minerals, and the establishment of strong scientific and cultural ties between the oldest educational institutions in Berlin, Freiberg, and St. Petersburg were the important results of this trip. For several decades, the scientific results of the expedition were published in the journal of the Mining Cadet Corps — the Gornyi Zhurnal. The tradition of donation and exchange of collections connected the history of the Mining Museum and many natural science museums in Europe.","PeriodicalId":36969,"journal":{"name":"Zapiski Rossiiskogo Mineralogicheskogo Obshchestva","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-12-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44055593","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 : 2019-11-01DOI: 10.30695/zrmo/2019.1485.08
N. Chukanov, Чуканов Никита Владимирович, A. R. Kotel’nikov, Котельников Алексей Рэдович, I. Pekov, Пеков Игорь Викторович, K. Van, Ван Константин Владимирович
Aluminosilicates with a cancrinite-type structure compositionally related to cancrisilite and a Ca-free and CO 3 — deficient cancrinite analogue were synthesized and characterized by electron microprobe and HCN-analyses, IR spectroscopy, and powder X-ray diffraction. The empirical formulae of the compounds obtained are H 0.05 Na 6.13 [Al 4.36 Si 7.64 O 24 ](CO 3 ) 0.91 · 2.85H 2 O and H 0.07 Na 6.19 [Al 5.53 Si 6.47 O 24 ]· ·(CO 3 ) 0.365 · 3.915H 2 O, respectively. The latter compound is characterized by disordered chains (···Na···H 2 O) ∞ in the narrow channel and a high content of H 2 O in the wide channel. The conditions for the formation of cancrisilite and carbonate-deficient cancrinite varieties in nature are discussed. It was concluded that supercritical conditions and ultra-agpitic environment contribute to crystallization of cancrisilite.
合成了一种与癌辉石和一种无ca和缺乏CO 3的癌辉石类似物结构相似的铝硅酸盐，并用电子探针、hcn分析、红外光谱和粉末x射线衍射对其进行了表征。所得化合物的实验式分别为:h0.05 Na 6.13 [Al 4.36 Si 7.64 O 24](CO 3) 0.91·2.85 h2o和h0.07 Na 6.19 [Al 5.53 Si 6.47 O 24]··(CO 3) 0.365·3.915 h2o。后一种化合物的特点是在窄通道中具有无序链(··Na···h2o)∞，在宽通道中具有高h2o含量。讨论了自然界中癌辉岩和缺碳酸盐癌辉岩的形成条件。结论认为，超临界条件和超湿化环境有助于癌辉石的结晶。
{"title":"On the conditions of the formation of cancrisilite Na7(Al5Si7O24)(CO3) · 3H2O and «hydroxycancrinite» Na6(Al6Si6O24) · 4H2O (on the basis of data on synthesis)","authors":"N. Chukanov, Чуканов Никита Владимирович, A. R. Kotel’nikov, Котельников Алексей Рэдович, I. Pekov, Пеков Игорь Викторович, K. Van, Ван Константин Владимирович","doi":"10.30695/zrmo/2019.1485.08","DOIUrl":"https://doi.org/10.30695/zrmo/2019.1485.08","url":null,"abstract":"Aluminosilicates with a cancrinite-type structure compositionally related to cancrisilite and a Ca-free and CO 3 — deficient cancrinite analogue were synthesized and characterized by electron microprobe and HCN-analyses, IR spectroscopy, and powder X-ray diffraction. The empirical formulae of the compounds obtained are H 0.05 Na 6.13 [Al 4.36 Si 7.64 O 24 ](CO 3 ) 0.91 · 2.85H 2 O and H 0.07 Na 6.19 [Al 5.53 Si 6.47 O 24 ]· ·(CO 3 ) 0.365 · 3.915H 2 O, respectively. The latter compound is characterized by disordered chains (···Na···H 2 O) ∞ in the narrow channel and a high content of H 2 O in the wide channel. The conditions for the formation of cancrisilite and carbonate-deficient cancrinite varieties in nature are discussed. It was concluded that supercritical conditions and ultra-agpitic environment contribute to crystallization of cancrisilite.","PeriodicalId":36969,"journal":{"name":"Zapiski Rossiiskogo Mineralogicheskogo Obshchestva","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43955152","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 : 2019-11-01DOI: 10.30695/zrmo/2019.1485.04
A. Kompanchenko, Компанченко Алёна Аркадьевна, A. Voloshin, Волошин Анатолий Васильевич, A. Bazai, Базай Айя Валериевна
Many occurrences and deposits of massive sulfide ores in the Kola Region are connected with the Paleoproterozoic Pechenga—Imandra—Varzuga Rift Belt (2.5—1.7 Ga). They are placed in volcanogenic-sedimentary complexes of South Pechenga (Bragino occurrence) and western part of Imandra-Varzugskaya structural zones (Pyrrhotite Ravine deposit, Tahtarvumchorr occurrence, etc.). The age of massive sulfide ore formation is expected to be about 1.9 Ga. The ores and their host complexes were metamorphosed under conditions close to the amphibolite facies. High degree of metamorphism of massive sulfide ores of the Kola region determined the features of their mineral composition, which are considered on the example of the Bragino occurrence. The article displays ore types, their mineral assemblages, and data on main minerals of ores: pyrrhotite, pyrite, sphalerite, marcasite, etc.
{"title":"Mineral composition of Paleoproterozoic metamorphosed massive sulfide ore in the Kola Region (a case study of the Bragino Occurrence, South Pechenga)","authors":"A. Kompanchenko, Компанченко Алёна Аркадьевна, A. Voloshin, Волошин Анатолий Васильевич, A. Bazai, Базай Айя Валериевна","doi":"10.30695/zrmo/2019.1485.04","DOIUrl":"https://doi.org/10.30695/zrmo/2019.1485.04","url":null,"abstract":"Many occurrences and deposits of massive sulfide ores in the Kola Region are connected with the Paleoproterozoic Pechenga—Imandra—Varzuga Rift Belt (2.5—1.7 Ga). They are placed in volcanogenic-sedimentary complexes of South Pechenga (Bragino occurrence) and western part of Imandra-Varzugskaya structural zones (Pyrrhotite Ravine deposit, Tahtarvumchorr occurrence, etc.). The age of massive sulfide ore formation is expected to be about 1.9 Ga. The ores and their host complexes were metamorphosed under conditions close to the amphibolite facies. High degree of metamorphism of massive sulfide ores of the Kola region determined the features of their mineral composition, which are considered on the example of the Bragino occurrence. The article displays ore types, their mineral assemblages, and data on main minerals of ores: pyrrhotite, pyrite, sphalerite, marcasite, etc.","PeriodicalId":36969,"journal":{"name":"Zapiski Rossiiskogo Mineralogicheskogo Obshchestva","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44004865","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 : 2019-09-09DOI: 10.30695/zrmo/2019.1484.06
S. Svetov, Светов Сергей Анатольевич, S. Chazhengina, Чаженгина Светлана Юрьевна, Vinod K. Singh, Сингх Винод, Zoya Rybnikova, Рыбникова Зоя Павловна, Sumit Mishra, Мишра Самит
SEM and LA-ICP-MS analyses were used for the study of accessory chromite in Archean (3.0—2.8 Ga) komatiites from the most representative greenstone belts of the Karelian Craton. Zoned chromite, subjected to varying degrees of metamorphic alteration, was identified in the komatiites. Two types of zoned chromite, differing in the composition of their cores, were recognized. Al-rich zoned chromite of type I shows the low extent of metamorphic alteration and has cores with Cr# 0.70—0.86, Mg# 0.03—0.12, and Fe# 0.06—0.23. It is enriched in Zn, Co, and Mn but strongly depleted in Ga, Ni, and V. The study reveals that the primary magmatic distribution of minor and trace elements in the cores was strongly redisturbed during prograde metamorphism of greenschist to low amphibolite facies. Zoned chromite with the low Al 2 O 3 content of type II has cores with higher Fe# (0.42—0.49), Cr# (0.88—1), and lower Mg# (0—0.04) as compared to cores of Al-rich chromite, that corresponds to the more intensive metamorphic alteration. Since the primary composition of studied zoned chromite was significantly obliterated during metamorphism, established patterns can be used as a guide for the reconstruction of metamorphic processes.
{"title":"Accessory zoned chromites from Archean komatiites of the Karelian craton, Russia: metamorphic fingerprints","authors":"S. Svetov, Светов Сергей Анатольевич, S. Chazhengina, Чаженгина Светлана Юрьевна, Vinod K. Singh, Сингх Винод, Zoya Rybnikova, Рыбникова Зоя Павловна, Sumit Mishra, Мишра Самит","doi":"10.30695/zrmo/2019.1484.06","DOIUrl":"https://doi.org/10.30695/zrmo/2019.1484.06","url":null,"abstract":"SEM and LA-ICP-MS analyses were used for the study of accessory chromite in Archean (3.0—2.8 Ga) komatiites from the most representative greenstone belts of the Karelian Craton. Zoned chromite, subjected to varying degrees of metamorphic alteration, was identified in the komatiites. Two types of zoned chromite, differing in the composition of their cores, were recognized. Al-rich zoned chromite of type I shows the low extent of metamorphic alteration and has cores with Cr# 0.70—0.86, Mg# 0.03—0.12, and Fe# 0.06—0.23. It is enriched in Zn, Co, and Mn but strongly depleted in Ga, Ni, and V. The study reveals that the primary magmatic distribution of minor and trace elements in the cores was strongly redisturbed during prograde metamorphism of greenschist to low amphibolite facies. Zoned chromite with the low Al 2 O 3 content of type II has cores with higher Fe# (0.42—0.49), Cr# (0.88—1), and lower Mg# (0—0.04) as compared to cores of Al-rich chromite, that corresponds to the more intensive metamorphic alteration. Since the primary composition of studied zoned chromite was significantly obliterated during metamorphism, established patterns can be used as a guide for the reconstruction of metamorphic processes.","PeriodicalId":36969,"journal":{"name":"Zapiski Rossiiskogo Mineralogicheskogo Obshchestva","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-09-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45929437","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 : 2019-09-09DOI: 10.30695/zrmo/2019.1484.00
Semen M. Beskin, Бескин Семен Матвеевич, Y. Marin, Марин Юрий Борисович
There are usually two generations of granitic pegmatites revealed in most of rare-metal pegmatite fields: beryl-bearing ones, often with tantalum-niobate, muscovite, inseparable from vein-shaped granite leucogranite complex, and sodium-lithium (Li, Ta, Cs, Be, Sn) pegmatites (or LCT-pegmatites), which are subdivided into «complex rare-metal» ones, with the pegmatite zonation and the major mineralization (large crystals of spodumene, tantalates, beryl, cassiterite, pollucite, petalite, amblygonite) in central parts of their body (Koktogay, Bernick Lake, Bikita, Karibib, Varutresk, Vishnyakovskoye, etc.), and «albite-spodumene» ones, composing numerous extensive pegmatite dykes without zoning, grouping in their fields as long as up to 10—15 km and more (Kings Mountain, Zavitinskoye, Goltsovoye, Kolmozero, Polmos Tundras, Tastygskoye, etc.). In some cases (Zavitinskoye, Vasin-Mylk, Shuckbjul), there are established complex rare-metal pegmatites occurring in «heads» of conveying dykes of «albite-spodumene pegmatites». The search of «parent granites» for «albite-spodumene pegmatites» is meaningless, because they are not pegmatites, but granites, although special ones (in fact, they are spodumene granites of the alakhinsky type). The terminological, as it seems to be, readjustment: «granite, not pegmatite», has its scientific ( a ) and prognostic ( b ) consequences. Firstly, there is resolving ( a ) the problem of parent granites, objections to the pegmatite status of «albite-spodumene pegmatites» become removed. This type of pegmatites occupies in history of magmatism over some pegmatite-bearing areas its independent, spodumene-rare-metal-granite stage, concluded by formation of their own — true — complex pegmatites. And secondly ( b ): it may be assumed that under such complex pegmatite fields as Koktogay, Bernick Lake, Bikita, Karibib, Vishnyakovskoye, there are occurring series of dikes of spodumene-rare-metal granites (i. e., Li ore deposits), which are differentiates of complex pegmatites.
{"title":"Pecularites of granite sistems including rare-metal pegmatites","authors":"Semen M. Beskin, Бескин Семен Матвеевич, Y. Marin, Марин Юрий Борисович","doi":"10.30695/zrmo/2019.1484.00","DOIUrl":"https://doi.org/10.30695/zrmo/2019.1484.00","url":null,"abstract":"There are usually two generations of granitic pegmatites revealed in most of rare-metal pegmatite fields: beryl-bearing ones, often with tantalum-niobate, muscovite, inseparable from vein-shaped granite leucogranite complex, and sodium-lithium (Li, Ta, Cs, Be, Sn) pegmatites (or LCT-pegmatites), which are subdivided into «complex rare-metal» ones, with the pegmatite zonation and the major mineralization (large crystals of spodumene, tantalates, beryl, cassiterite, pollucite, petalite, amblygonite) in central parts of their body (Koktogay, Bernick Lake, Bikita, Karibib, Varutresk, Vishnyakovskoye, etc.), and «albite-spodumene» ones, composing numerous extensive pegmatite dykes without zoning, grouping in their fields as long as up to 10—15 km and more (Kings Mountain, Zavitinskoye, Goltsovoye, Kolmozero, Polmos Tundras, Tastygskoye, etc.). In some cases (Zavitinskoye, Vasin-Mylk, Shuckbjul), there are established complex rare-metal pegmatites occurring in «heads» of conveying dykes of «albite-spodumene pegmatites». The search of «parent granites» for «albite-spodumene pegmatites» is meaningless, because they are not pegmatites, but granites, although special ones (in fact, they are spodumene granites of the alakhinsky type). The terminological, as it seems to be, readjustment: «granite, not pegmatite», has its scientific ( a ) and prognostic ( b ) consequences. Firstly, there is resolving ( a ) the problem of parent granites, objections to the pegmatite status of «albite-spodumene pegmatites» become removed. This type of pegmatites occupies in history of magmatism over some pegmatite-bearing areas its independent, spodumene-rare-metal-granite stage, concluded by formation of their own — true — complex pegmatites. And secondly ( b ): it may be assumed that under such complex pegmatite fields as Koktogay, Bernick Lake, Bikita, Karibib, Vishnyakovskoye, there are occurring series of dikes of spodumene-rare-metal granites (i. e., Li ore deposits), which are differentiates of complex pegmatites.","PeriodicalId":36969,"journal":{"name":"Zapiski Rossiiskogo Mineralogicheskogo Obshchestva","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-09-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"69567656","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 : 2019-09-09DOI: 10.30695/zrmo/2019.1484.08
Vladimir S. Shkodzinskiy, Шкодзинский Владимир Степанович, Viktor V. Beskrovanov, Бескрованов Виктор Васильевич
The one-way evolution of inclusions in diamonds and its ultra-long duration (more than 2.8 Ga) provide evidence that the crystallization of diamonds took place from the fractionated peridotitic layer in the global magmatic ocean. Diamonds were formed as a result of accumulation of carbon in residual kimberlitic melts. The increment of SiO 2 concentration in the melts caused increase in its viscosity, decrease of diffusion velocity and degree of carbon oversaturation. These resulted that the layered diamond crystallization mode was changed by the radial one, diamond octahedrons transformed into rhombic dodecahedrons and cubes, varied sculptures were created on diamond crystals faces.
{"title":"Nature of diversity of diamonds in kimberlites","authors":"Vladimir S. Shkodzinskiy, Шкодзинский Владимир Степанович, Viktor V. Beskrovanov, Бескрованов Виктор Васильевич","doi":"10.30695/zrmo/2019.1484.08","DOIUrl":"https://doi.org/10.30695/zrmo/2019.1484.08","url":null,"abstract":"The one-way evolution of inclusions in diamonds and its ultra-long duration (more than 2.8 Ga) provide evidence that the crystallization of diamonds took place from the fractionated peridotitic layer in the global magmatic ocean. Diamonds were formed as a result of accumulation of carbon in residual kimberlitic melts. The increment of SiO 2 concentration in the melts caused increase in its viscosity, decrease of diffusion velocity and degree of carbon oversaturation. These resulted that the layered diamond crystallization mode was changed by the radial one, diamond octahedrons transformed into rhombic dodecahedrons and cubes, varied sculptures were created on diamond crystals faces.","PeriodicalId":36969,"journal":{"name":"Zapiski Rossiiskogo Mineralogicheskogo Obshchestva","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-09-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43857831","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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