Leonid Shumlyanskyy | Taras Shevchenko National University of Kyiv (original) (raw)

Papers by Leonid Shumlyanskyy

Mineralogical Journal

Small-scale layered intrusions of mafic composition enriched in ilmenite, magnetite and apatite a... more Small-scale layered intrusions of mafic composition enriched in ilmenite, magnetite and apatite are known in association with the rocks of the anorthositic series of the Korosten pluton. Two Fe-Ti-P deposits have been explored in the most well studied Fedorivka and Stremyhorod intrusions. The geological setting, mineral and chemical composition of mafic intrusions is similar. They are considered to be typical layered intrusions, with gradual accumulation of ore minerals in the upper part of the layered series. This review examines some mineralogical and geochemical features of ores of the Stremyhorod intrusion. Ores are represented by olivine (melano-) gabbro with peridotitic layers. Olivine (Fa46—55), augite, plagioclase (An45—56) and biotite are the main rock-forming minerals. Among the ore minerals, the most common are homogeneous ilmenite (Hem4—6), while magnetite (Uspl2—39) with lamellae's of ilmenite, and apatite occur in a subordinate amount. Apatite is enriched in LREE (...

Mìneralogìčnij žurnal, 2024

Reports of the National Academy of Sciences of Ukraine, Jul 11, 2023

Th e age of detrital zircon from metasedimentary rocks of the Ternuvate strata (West Azov block o... more Th e age of detrital zircon from metasedimentary rocks of the Ternuvate strata (West Azov block of the Ukrainian Shield) Presented by Academician of the NAS of Ukraine O.M. Ponomarenko Th e Ternuvate strata comprise metamorphic rocks that make up the Haichur arcuate structure, which is about 72 km long. Its western part lies within the Andriivka fault zone, which separates the Vovcha and Huliaipole blocks, while the eastern part is located within the Ternuvate fault zone, traced on the Remivka block. Th e rocks composing the Haichur structure have irregular and laterally variable composition, changeable thickness, and exhibit dynamometamorphic structures of boudinage and schistosity. Th e upper part of the Ternuvate strata mainly consists of metasedimentary rocks, including gneisses, biotite schists, garnet-biotite, magnetite-amphibole, and feldspar quartzites. Th e lower part comprises volcanogenic rocks such as amphibolites, metaultrabasites, and biotite-amphibole gneisses. Using the LA-ICP-MS method, 38 zircon crystals from muscovite-biotite gneisses in the upper part of the Ternuvate strata were analyzed. Based on the geochemical data, these zircons are metamorphosed graywackes. Th e zircon crystals belong to several age populations (3.65-3.45 and 3.3-2.95 Ga), corresponding to the major stages of Archean crust formation in the West Azov domain, including the formation of the oldest basement and granite-greenstone complexes of the Paleoarchean and Mesoarchean ages. Identical populations of detrital zircon were found in the early Precambrian metaterrigenous rocks of the Krutobalka Formation in the Sorokyne greenstone structure. Th e correspondence between the Paleoarchean crust (3.45-3.65 Ga) of the West Azov block of the Ukrainian Shield and the Kursk-Besedine granulitegneiss area of the Kursk Magnetic Anomaly block is evident, while the Paleoarchean and Mesoarchean complexes (2.9-3.3 Ga) correspond to the Mykhailivka and Orel-Tim granite-greenstone area of the Kursk Magnetic Anomaly block. Th e Archean complexes of Sarmatia are of the same age as similar formations in the Kaapvaal craton in South Africa, Bastar craton in India, North China Craton, Slave craton in Canada, and others, which formed during the Eoarchaean.

Geohìmìâ ta rudoutvorennâ, 2012

Geologìčnij žurnal, Apr 16, 2021

The Azov Domain occurs as a part of a larger Mesoarchean (3.2-3.0 Ga) craton, fragments of which ... more The Azov Domain occurs as a part of a larger Mesoarchean (3.2-3.0 Ga) craton, fragments of which are preserved in the eastern part of the Ukrainian Shield and as a block of the Kursk Magnetic Anomaly (KMA). In the Neoarchean-Palaeoproterozoic time, it was fragmented into several tectonic blocks: Vovcha, Remivka, Huliaipole, Bilotserkivka, and Saltych. The northern part of the Huliaipole Block is composed of tonalite-trondhjemite-granodiorite (TTG) rock association, that hosts the Kosivtsevo greenstone structure. It is composed of metamorphosed rocks of the jaspilite-komatiite-tholeiite association (the Kosivtsevo unit), which corresponds to the Sura Suite of the Konka Series of the Middle Dnieper Domain. The Neoarchean-Paleoproterozoic formations are represented by volcano-sedimentary rocks of the Huliaipole Suite and granitoids of the Dobropillya and Anadol complexes. Granitoids of the Dobropillya complex host numerous pyroxenite, gneiss, and plagioclase granite xenoliths. The U-Pb zircon age of granitoids of the Dobropillya Complex is 2040 Ma and inherited zircon has an age up to 3400 Ma. Small intrusions of two-feldspar granites of the Anadol Complex are widespread in the Ternuvate structure. Their U-Pb monazite age is 2190 Ma. In the central part of the Huliaipole Block, the NW-striking Huliaipole syncline (3.5 × 9 km) occurs. This structure is composed of volcano-sedimentary rocks of the Huliaipole Suite, which unconformably overlie Archean TTG. Felsic and intermediate metavolcanics are confined mainly to ferruginous quartzites of the middle Subsuites. To a limited extent, meta-andesites and felsic metavolcanics are also found in the lower and upper Huliaipole Subsuites. Zircons from meta-andesites and felsic metavolcanics of the Huliaipole Suite are very heterogeneous, indicating their crustal derivation. The U-Pb age of zircon populations from metadacite of the Huliaipole Suite was determined using the LA-ICP-MS method at 3085-2850 and 3700-3360 Ma. In addition, the age of the two crystals exceeded 3800 Ma. According to geological and geochronological data, the Huliaipole Block, 30 × 50 km in size, is composed of rocks and relicts of the Hadean, Archean, and Palaeoproterozoic eons. The oldest nucleoid of the Azov Domain

Petrology, Nov 1, 2019

The paper is dedicated to the study of the Devonian magmatic association of the Eastern Azov regi... more The paper is dedicated to the study of the Devonian magmatic association of the Eastern Azov region, which is a part of the Pripyat-Dnieper-Donets rift zone. The association includes gabbros, peridotites, pyroxenites, and lamprophyre dikes of the Pokrovo-Kireevsky massif (PKM) and picrites, picrobasalts, and basalts of the Anton-Taram Formation (ATF). Analysis of clinopyroxenes of different generations from the PKM micaceous gabbro and the ATF alkaline picrite provided insight into the mantle source of these rocks and the evolution of melts, which determined the close spatiotemporal association of kimberlites, basites, ultramafic rocks, including alkaline varieties. Clinopyroxenes from the micaceous gabbro are composed of Cpx1 (Mg # = 0.87-0.88) or Сpx2 (Mg # = 0.80-0.81) cores and Cpx3 external zones (Mg # = 0.70-0.76). Clinopyroxenes from alkaline picrite are composed of Сpx2 cores (Mg # = 0.80-0.84) and external Cpx3 zones (Mg # = 0.71-0.78). Clinopyroxenes in general have an upward concave multielement pattern, with enrichment in LREE, depletion in Ba, Nb, and HREE, Zr-Hf negative anomaly, and, additionally, negative Sr-anomaly in Cpx2 and Cpx3. The calculated equilibrium melts for Сpx2 from the micaceous gabbro are very close in composition to this gabbro, and those for Cpx2 from the alkaline picrite coincide in composition with this picrite, and in general are close to ATF picritic lavas. The high Mg# and Cr content in cores Cpx1 indicate that this mineral was derived from the earliest weakly differentiated magma close to the primary melt. The presence of a negative Zr-Hf anomaly in Cpx1 geochemical patterns at Zr PM <Hf РМ suggests that their equilibrium melts were derived through melting of metasomatized, possibly carbonated garnet-bearing peridotites. Cores Cpx1 are likely relics of phenocrysts that crystallized from the earliest melt during the formation of the PKM and accompanying ATF volcanic rocks. An important feature of the Eastern Azov rocks is the very high Ti content (up to 7.3 wt.% TiO 2) in the highest Mg (Mg# 0.48-0.65) and deepest seated (CaO/Al 2 O 3 > 0.8) melts, which generated picrobasalts and lamprophyres. The geochemical similarity of the early Cpx1 cores with clinopyroxenes from ilmenite-bearing mantle metasomatites is consistent with the assumption that ultrahigh-Ti primary melts of the Eastern Azov lamprophyres were derived from carbonated ilmenite-bearing, and likely, phlogopite-bearing (PIC) peridotites.

Geohìmìâ ta rudoutvorennâ, 2017

Mìneralogìčnij žurnal, 2023

We used LA-ICP-MS U-Pb data for detrital zircon to constrain the Maximum Depositional Age (MDA) a... more We used LA-ICP-MS U-Pb data for detrital zircon to constrain the Maximum Depositional Age (MDA) and provenance of clastic sedimentary rocks of the Volyn-Orsha sedimentary basin, which filled an elongated (~625×250 km) depression in SW Baltica and attained ~900 m in thickness. Eighty-six zircons out of one hundred and three yielded concordant dates, with most of them (86 %) falling in the time interval between 1655 ± 3 and 1044 ± 16 Ma and clustering in two peaks at ca. 1630 and 1230 Ma. The remaining zircons yielded dates older than 1800 Ma. The MDA is defined by a tight group of three zircons with a weighted average age of 1079 ± 8 Ma. This age corresponds to the time of a clockwise ~90° rotation of Baltica and the formation of the Grenvillian – Sveconorwegian – Sunsas orogenic belts. Subsidence was facilitated by the presence of eclogites derived from subducted oceanic crust. The sediments of the Orsha sub-basin in the northeastern part of the basin were derived from the local crystalline basement, whereas the sediments in the Volyn sub-basin, extending to the margin of Baltica, were transported from the orogen between Laurentia, Baltica, and Amazonia.

Mìneralogìčnij žurnal, 2021

Results of a study of U-Pb and Hf isotope systematics and trace element concentrations in five zi... more Results of a study of U-Pb and Hf isotope systematics and trace element concentrations in five zircon crystals separated from the Devonian Petrivske kimberlite are reported in the paper. Four zircons have yielded Paleoproterozoic and Archean ages, while one zircon grain gave a Devonian age of 383.6±4.4 Ma (weighted mean 206Pb/238U age). The Precambrian zircons have been derived from terrigenous rocks of the Mykolaivka Suite that is cut by kimberlite, or directly from the Precambrian rock complexes that constitute continental crust in the East Azov. The Devonian zircon crystal has the U-Pb age that corresponds to the age of kimberlite emplacement. It is 14 m.y. younger than zircon megacrysts found in the Novolaspa kimberlite pipe in the same area. In addition, Petrivske zircon is richer in trace elements than its counterparts from the Novolaspa pipe. Petrivske and Novolaspa zircons crystallized from two different proto-kimberlite melts, whereas the process of kimberlite formation was very complex and possibly included several episodes of formation of proto-kimberlite melts, separated by extended (over 10 M.y.) periods of time.

Geosciences, May 22, 2023

This article is an open access article distributed under the terms and conditions of the Creative... more This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY

Geologìčnij žurnal, Jun 16, 2020

Geohìmìâ ta rudoutvorennâ, 2018

Geohìmìâ ta rudoutvorennâ, 2017

Mìneralogìčnij žurnal, 2015

Geohìmìâ ta rudoutvorennâ, 2015

large anorthosite-mangerite-charnockite granite (AMCG) plutonic complexes – Korosten (KPC) and Ko... more large anorthosite-mangerite-charnockite granite (AMCG) plutonic complexes – Korosten (KPC) and Korsun-Novomyrgorod (KNPC). The Korosten plutonic complex is located in the north-western region of the Ukrainian shield while the Korsun-Novomyrgorod complex – is in the central part, in the Kirovograd region. Basement of both regions is Paleoproterozoic in age and formed during a 2.1–2.05 Ga orogenic event that resulted in the formation of thick metavolcanic and metaterrigenous sequences and numerous granitic intrusions. Both regions can be considered as parts of a single active continental margin (or its Paleoproterozoic equivalent) that rimmed the Archaean Dniester (Podolian)-Bug craton. The northwestern margin of Sarmatia was also affected by an important crust-forming process that took place at 2.0–1.95 Ga and resulted in formation of the OsnitskMikashevychi igneous belt. The KPC is one of the largest and most typical examples of an AMCG complex in the world. It occupies an area of about 12 000 km and appears as a multiphase anorogenic intrusive complex formed in the Paleoproterozoic. About 75 % of the Korosten complex is composed of rapakivi granite while the rest belongs to various basic rock types. The KPC is predominantly bimodal and composed of a variety of granitic rocks generally regarded as rapakivi and rapakivilike granites, and a family of basic rocks that includes predominant anorthosite and leucogabbro and subordinate gabbroic rocks. Other rock types include syenites, monzonitic syenites, etc. and are minor in abundance. The basic rocks occur predominantly as sheet-like bodies varying in thickness from a few kilometers to a few hundreds of meters. On the basis of detailed field investigations it was shown that basic rocks of the large gabbro-anorthosite massif were intruded in several pulses (represented by sub-phases). Each of such subphases corresponds to specific rock assemblages ter© Shumlyanskyy L., Ernst R., Billström K., 2015 UDC 550.93 (477.42) Геохімія і петрологія процесів породота рудоутворення

Mineralogical Journal

Small-scale layered intrusions of mafic composition enriched in ilmenite, magnetite and apatite a... more Small-scale layered intrusions of mafic composition enriched in ilmenite, magnetite and apatite are known in association with the rocks of the anorthositic series of the Korosten pluton. Two Fe-Ti-P deposits have been explored in the most well studied Fedorivka and Stremyhorod intrusions. The geological setting, mineral and chemical composition of mafic intrusions is similar. They are considered to be typical layered intrusions, with gradual accumulation of ore minerals in the upper part of the layered series. This review examines some mineralogical and geochemical features of ores of the Stremyhorod intrusion. Ores are represented by olivine (melano-) gabbro with peridotitic layers. Olivine (Fa46—55), augite, plagioclase (An45—56) and biotite are the main rock-forming minerals. Among the ore minerals, the most common are homogeneous ilmenite (Hem4—6), while magnetite (Uspl2—39) with lamellae's of ilmenite, and apatite occur in a subordinate amount. Apatite is enriched in LREE (...

Mìneralogìčnij žurnal, 2024

Reports of the National Academy of Sciences of Ukraine, Jul 11, 2023

Th e age of detrital zircon from metasedimentary rocks of the Ternuvate strata (West Azov block o... more Th e age of detrital zircon from metasedimentary rocks of the Ternuvate strata (West Azov block of the Ukrainian Shield) Presented by Academician of the NAS of Ukraine O.M. Ponomarenko Th e Ternuvate strata comprise metamorphic rocks that make up the Haichur arcuate structure, which is about 72 km long. Its western part lies within the Andriivka fault zone, which separates the Vovcha and Huliaipole blocks, while the eastern part is located within the Ternuvate fault zone, traced on the Remivka block. Th e rocks composing the Haichur structure have irregular and laterally variable composition, changeable thickness, and exhibit dynamometamorphic structures of boudinage and schistosity. Th e upper part of the Ternuvate strata mainly consists of metasedimentary rocks, including gneisses, biotite schists, garnet-biotite, magnetite-amphibole, and feldspar quartzites. Th e lower part comprises volcanogenic rocks such as amphibolites, metaultrabasites, and biotite-amphibole gneisses. Using the LA-ICP-MS method, 38 zircon crystals from muscovite-biotite gneisses in the upper part of the Ternuvate strata were analyzed. Based on the geochemical data, these zircons are metamorphosed graywackes. Th e zircon crystals belong to several age populations (3.65-3.45 and 3.3-2.95 Ga), corresponding to the major stages of Archean crust formation in the West Azov domain, including the formation of the oldest basement and granite-greenstone complexes of the Paleoarchean and Mesoarchean ages. Identical populations of detrital zircon were found in the early Precambrian metaterrigenous rocks of the Krutobalka Formation in the Sorokyne greenstone structure. Th e correspondence between the Paleoarchean crust (3.45-3.65 Ga) of the West Azov block of the Ukrainian Shield and the Kursk-Besedine granulitegneiss area of the Kursk Magnetic Anomaly block is evident, while the Paleoarchean and Mesoarchean complexes (2.9-3.3 Ga) correspond to the Mykhailivka and Orel-Tim granite-greenstone area of the Kursk Magnetic Anomaly block. Th e Archean complexes of Sarmatia are of the same age as similar formations in the Kaapvaal craton in South Africa, Bastar craton in India, North China Craton, Slave craton in Canada, and others, which formed during the Eoarchaean.

Geohìmìâ ta rudoutvorennâ, 2012

Geologìčnij žurnal, Apr 16, 2021

The Azov Domain occurs as a part of a larger Mesoarchean (3.2-3.0 Ga) craton, fragments of which ... more The Azov Domain occurs as a part of a larger Mesoarchean (3.2-3.0 Ga) craton, fragments of which are preserved in the eastern part of the Ukrainian Shield and as a block of the Kursk Magnetic Anomaly (KMA). In the Neoarchean-Palaeoproterozoic time, it was fragmented into several tectonic blocks: Vovcha, Remivka, Huliaipole, Bilotserkivka, and Saltych. The northern part of the Huliaipole Block is composed of tonalite-trondhjemite-granodiorite (TTG) rock association, that hosts the Kosivtsevo greenstone structure. It is composed of metamorphosed rocks of the jaspilite-komatiite-tholeiite association (the Kosivtsevo unit), which corresponds to the Sura Suite of the Konka Series of the Middle Dnieper Domain. The Neoarchean-Paleoproterozoic formations are represented by volcano-sedimentary rocks of the Huliaipole Suite and granitoids of the Dobropillya and Anadol complexes. Granitoids of the Dobropillya complex host numerous pyroxenite, gneiss, and plagioclase granite xenoliths. The U-Pb zircon age of granitoids of the Dobropillya Complex is 2040 Ma and inherited zircon has an age up to 3400 Ma. Small intrusions of two-feldspar granites of the Anadol Complex are widespread in the Ternuvate structure. Their U-Pb monazite age is 2190 Ma. In the central part of the Huliaipole Block, the NW-striking Huliaipole syncline (3.5 × 9 km) occurs. This structure is composed of volcano-sedimentary rocks of the Huliaipole Suite, which unconformably overlie Archean TTG. Felsic and intermediate metavolcanics are confined mainly to ferruginous quartzites of the middle Subsuites. To a limited extent, meta-andesites and felsic metavolcanics are also found in the lower and upper Huliaipole Subsuites. Zircons from meta-andesites and felsic metavolcanics of the Huliaipole Suite are very heterogeneous, indicating their crustal derivation. The U-Pb age of zircon populations from metadacite of the Huliaipole Suite was determined using the LA-ICP-MS method at 3085-2850 and 3700-3360 Ma. In addition, the age of the two crystals exceeded 3800 Ma. According to geological and geochronological data, the Huliaipole Block, 30 × 50 km in size, is composed of rocks and relicts of the Hadean, Archean, and Palaeoproterozoic eons. The oldest nucleoid of the Azov Domain

Petrology, Nov 1, 2019

The paper is dedicated to the study of the Devonian magmatic association of the Eastern Azov regi... more The paper is dedicated to the study of the Devonian magmatic association of the Eastern Azov region, which is a part of the Pripyat-Dnieper-Donets rift zone. The association includes gabbros, peridotites, pyroxenites, and lamprophyre dikes of the Pokrovo-Kireevsky massif (PKM) and picrites, picrobasalts, and basalts of the Anton-Taram Formation (ATF). Analysis of clinopyroxenes of different generations from the PKM micaceous gabbro and the ATF alkaline picrite provided insight into the mantle source of these rocks and the evolution of melts, which determined the close spatiotemporal association of kimberlites, basites, ultramafic rocks, including alkaline varieties. Clinopyroxenes from the micaceous gabbro are composed of Cpx1 (Mg # = 0.87-0.88) or Сpx2 (Mg # = 0.80-0.81) cores and Cpx3 external zones (Mg # = 0.70-0.76). Clinopyroxenes from alkaline picrite are composed of Сpx2 cores (Mg # = 0.80-0.84) and external Cpx3 zones (Mg # = 0.71-0.78). Clinopyroxenes in general have an upward concave multielement pattern, with enrichment in LREE, depletion in Ba, Nb, and HREE, Zr-Hf negative anomaly, and, additionally, negative Sr-anomaly in Cpx2 and Cpx3. The calculated equilibrium melts for Сpx2 from the micaceous gabbro are very close in composition to this gabbro, and those for Cpx2 from the alkaline picrite coincide in composition with this picrite, and in general are close to ATF picritic lavas. The high Mg# and Cr content in cores Cpx1 indicate that this mineral was derived from the earliest weakly differentiated magma close to the primary melt. The presence of a negative Zr-Hf anomaly in Cpx1 geochemical patterns at Zr PM <Hf РМ suggests that their equilibrium melts were derived through melting of metasomatized, possibly carbonated garnet-bearing peridotites. Cores Cpx1 are likely relics of phenocrysts that crystallized from the earliest melt during the formation of the PKM and accompanying ATF volcanic rocks. An important feature of the Eastern Azov rocks is the very high Ti content (up to 7.3 wt.% TiO 2) in the highest Mg (Mg# 0.48-0.65) and deepest seated (CaO/Al 2 O 3 > 0.8) melts, which generated picrobasalts and lamprophyres. The geochemical similarity of the early Cpx1 cores with clinopyroxenes from ilmenite-bearing mantle metasomatites is consistent with the assumption that ultrahigh-Ti primary melts of the Eastern Azov lamprophyres were derived from carbonated ilmenite-bearing, and likely, phlogopite-bearing (PIC) peridotites.

Geohìmìâ ta rudoutvorennâ, 2017

Mìneralogìčnij žurnal, 2023

We used LA-ICP-MS U-Pb data for detrital zircon to constrain the Maximum Depositional Age (MDA) a... more We used LA-ICP-MS U-Pb data for detrital zircon to constrain the Maximum Depositional Age (MDA) and provenance of clastic sedimentary rocks of the Volyn-Orsha sedimentary basin, which filled an elongated (~625×250 km) depression in SW Baltica and attained ~900 m in thickness. Eighty-six zircons out of one hundred and three yielded concordant dates, with most of them (86 %) falling in the time interval between 1655 ± 3 and 1044 ± 16 Ma and clustering in two peaks at ca. 1630 and 1230 Ma. The remaining zircons yielded dates older than 1800 Ma. The MDA is defined by a tight group of three zircons with a weighted average age of 1079 ± 8 Ma. This age corresponds to the time of a clockwise ~90° rotation of Baltica and the formation of the Grenvillian – Sveconorwegian – Sunsas orogenic belts. Subsidence was facilitated by the presence of eclogites derived from subducted oceanic crust. The sediments of the Orsha sub-basin in the northeastern part of the basin were derived from the local crystalline basement, whereas the sediments in the Volyn sub-basin, extending to the margin of Baltica, were transported from the orogen between Laurentia, Baltica, and Amazonia.

Mìneralogìčnij žurnal, 2021

Results of a study of U-Pb and Hf isotope systematics and trace element concentrations in five zi... more Results of a study of U-Pb and Hf isotope systematics and trace element concentrations in five zircon crystals separated from the Devonian Petrivske kimberlite are reported in the paper. Four zircons have yielded Paleoproterozoic and Archean ages, while one zircon grain gave a Devonian age of 383.6±4.4 Ma (weighted mean 206Pb/238U age). The Precambrian zircons have been derived from terrigenous rocks of the Mykolaivka Suite that is cut by kimberlite, or directly from the Precambrian rock complexes that constitute continental crust in the East Azov. The Devonian zircon crystal has the U-Pb age that corresponds to the age of kimberlite emplacement. It is 14 m.y. younger than zircon megacrysts found in the Novolaspa kimberlite pipe in the same area. In addition, Petrivske zircon is richer in trace elements than its counterparts from the Novolaspa pipe. Petrivske and Novolaspa zircons crystallized from two different proto-kimberlite melts, whereas the process of kimberlite formation was very complex and possibly included several episodes of formation of proto-kimberlite melts, separated by extended (over 10 M.y.) periods of time.

Geosciences, May 22, 2023

This article is an open access article distributed under the terms and conditions of the Creative... more This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY

Geologìčnij žurnal, Jun 16, 2020

Geohìmìâ ta rudoutvorennâ, 2018

Geohìmìâ ta rudoutvorennâ, 2017

Mìneralogìčnij žurnal, 2015

Geohìmìâ ta rudoutvorennâ, 2015

large anorthosite-mangerite-charnockite granite (AMCG) plutonic complexes – Korosten (KPC) and Ko... more large anorthosite-mangerite-charnockite granite (AMCG) plutonic complexes – Korosten (KPC) and Korsun-Novomyrgorod (KNPC). The Korosten plutonic complex is located in the north-western region of the Ukrainian shield while the Korsun-Novomyrgorod complex – is in the central part, in the Kirovograd region. Basement of both regions is Paleoproterozoic in age and formed during a 2.1–2.05 Ga orogenic event that resulted in the formation of thick metavolcanic and metaterrigenous sequences and numerous granitic intrusions. Both regions can be considered as parts of a single active continental margin (or its Paleoproterozoic equivalent) that rimmed the Archaean Dniester (Podolian)-Bug craton. The northwestern margin of Sarmatia was also affected by an important crust-forming process that took place at 2.0–1.95 Ga and resulted in formation of the OsnitskMikashevychi igneous belt. The KPC is one of the largest and most typical examples of an AMCG complex in the world. It occupies an area of about 12 000 km and appears as a multiphase anorogenic intrusive complex formed in the Paleoproterozoic. About 75 % of the Korosten complex is composed of rapakivi granite while the rest belongs to various basic rock types. The KPC is predominantly bimodal and composed of a variety of granitic rocks generally regarded as rapakivi and rapakivilike granites, and a family of basic rocks that includes predominant anorthosite and leucogabbro and subordinate gabbroic rocks. Other rock types include syenites, monzonitic syenites, etc. and are minor in abundance. The basic rocks occur predominantly as sheet-like bodies varying in thickness from a few kilometers to a few hundreds of meters. On the basis of detailed field investigations it was shown that basic rocks of the large gabbro-anorthosite massif were intruded in several pulses (represented by sub-phases). Each of such subphases corresponds to specific rock assemblages ter© Shumlyanskyy L., Ernst R., Billström K., 2015 UDC 550.93 (477.42) Геохімія і петрологія процесів породота рудоутворення