Раннемеловые Коллизионные Гранитоиды Древнестанового Комплекса Селенгино-Станового Супертеррейна Центрально-Азиатского Подвижного Пояса

Котов, А. Б.; Ларин, А. М.; Сальникова, Е. Б.; Великославинский, С. Д.; Глебовицкий, В. А.; Сорокин, А. А.; Яковлева, С. З.; Анисимова, И. В.

doi:10.7868/s0869565214160233

Cited by 3 publications

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“…Вопросы геологического строения и история развития Джугджуро-Становой складчатой области, расположенной в северо-восточной части Центрально-Азиатского супертеррейна, рассматриваются в ряде работ [1,3,7,12,15].…”

Section: краткая характеристика положения ларбинского блока в структу...unclassified

“…ков, из которых формировались протолиты парагнейсов. Следует добавить, что пока нет однозначного решения этого вопроса: в большей степени в литературе приводятся [2,3,5,7,11,15,44] Моделирование метаморфического минералообразования производилось на основе петрологической программы THERIAK-DOMINO [31,32] с использованием модифицированной (http://titan.minpet. unibas.ch/) термодинамической базы данных минералов [26,27] и твердых растворов [28,29]…”

Section: краткая характеристика положения ларбинского блока в структу...unclassified

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Mineralogical Composition, Metamorphic Parameters and Protoliths of Granulites From the Larba Block of the Dzhugdzhur-Stanovoy Fold Area

Yurchenko,

Baltybaev,

Volkova

et al. 2024

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The article focuses on the issues related to the primary nature and metamorphism of gneisses from the Larba block of the Dzhugdzhur-Stanovoy fold area, which are based on the study of the mineralogical composition of supracrustal rocks. PT-parameters for the highest temperature and pressure metamorphic transformations of rocks of the Larba block are estimated as P = 6.5–8.5 kbar and T > 800°C. Relatively low-temperature garnet-biotite, garnet-biotite-chlorite mineral parageneses were formed at the regressive stage of metamorphism at ~4–6 kbar and temperatures up to 500–600°C. Wide variations in paragneiss compositions indicate that protoliths of the studied gneisses differed in composition. Overall, Larba metasedimentary rocks had weakly and moderately weathered source areas. Most of the compositions of paragneisses are localized in the field of chlorite-montmorillonite, montmorillonite-kaolinite-hydromica and chlorite clays formed from the mafic substrate. Low alkalinity in combination with a high MgO content indicates the presence of rock erosion products with a significant admixture of basic volcanic material in the detrital material. Migmatization of rocks is the most significant factor distorting the reconstruction of the original rock composition.

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Section: краткая характеристика положения ларбинского блока в структу...unclassified

Mineralogical Composition, Metamorphic Parameters and Protoliths of Granulites From the Larba Block of the Dzhugdzhur-Stanovoy Fold Area

Yurchenko,

Baltybaev,

Volkova

et al. 2024

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“…В современном структурном плане он представляет собой сложный коллаж палеозойских и раннемезозойских комплексов, зажатых между крупными континентальными блоками Восточной Азии -Северо-Азиатским кратоном и Амурским супертеррейном, и часто описывается как шовная зона или сутура [3,24,25].Возраст окончательного формирования Монголо-Охотского пояса как складчатой структуры на месте ранее существовавшего океана является предметом дискуссий. Большинство исследователей [8,16,17,19,20,28,41] на основе анализа мезозойского магматизма и метаморфизма к югу и северу от складчатого пояса полагают, что пик коллизионных процессов…”

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“…Возраст окончательного формирования Монголо-Охотского пояса как складчатой структуры на месте ранее существовавшего океана является предметом дискуссий. Большинство исследователей [8,16,17,19,20,28,41] на основе анализа мезозойского магматизма и метаморфизма к югу и северу от складчатого пояса полагают, что пик коллизионных процессов…”

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The Age of Gold Mineralization at the Elga Deposit (Mongol-Okhotsk Fold Belt): 40ar/39ar Geochronological Constraints

Kadashnikova¹,

Sorokin²,

Travin³

et al. 2022

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In our 40Ar/39Ar geochronological study, the age of gold mineralization of the Elga deposit is determined. The Elga deposit is located in the eastern part of the Mongol-Okhotsk fold belt. The data obtained indicate that the age of ore metasomatites and hydrothermally and metasomatically altered carbon-bearing sericite-feldspar-quartz shales can be estimated at 139–137 Ma. It is impossible to link the ore mineralization of the Elga deposit with magmatic processes since the igneous complexes located within the study area are either younger or significantly older than mineralization. The sericite from the Talyma Formation shales outside the ore zone is found to be almost of the identical age, that is, 139 Ma. Thus, the final stage of regional metamorphism and deformation is coeval with the formation of ore metasomatites. We suggest that the main factors in the mobilization, redistribution of the ore matter and the formation of the Elga deposit were post-collisional dislocation processes accompanied by hydrothermal activity and metasomatism.

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Amudzhikan volcano-plutonic association of the eastern part of the West-Stanovoy superterrane (Central Asian orogenic belt): age, sources, and tectonic setting

Larin,

Kotov,

Sal’nikova

et al. 2024

Petrologiâ

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Geochronological (U-Pb on zircons, ID-TIMS), isotope-geochemical (Nd, Sr, Pb), and geochemical studies of rocks of the Amanan and Amudzhikan intrusive complexes and volcanic rocks of the Ukurey Suite in the eastern part of the West Stanovoy superterrane of the Central Asian Fold Belt were performed. The belonging of granitoids of these complexes to high-potassium C-type adakites is substantiated. The cogeneticity of the studied rocks has been established, which makes it possible to unite them into one Amudzhikan volcano-plutonic association formed in the age range of 133±1–128±1 Ma. The igneous complexes of this association are part of the Stanovoy volcano-plutonic belt, which extends in the sublatitudinal direction from the Pacific Ocean deep into the North Asian continent for more than 1000 km subparallel to the Mongol-Okhotsk suture zone and stitches the tectonic structures of the Dzhugdzhur-Stanovoy and West-Stanovoy superterranes. The formation of the Stanovoy Belt is connected with the closure of the Mongolo-Okhotsk Ocean and the collision of the continental masses of the North Asian and Sino-Korean continents at the turn of ~140 Ma. The subsequent collapse of the collisional orogen, accompanied by large-scale lithospheric extension and delamination of the lower part of the continental lithosphere, led to upwelling of the asthenospheric mantle. This caused the melting of the lithospheric mantle and continental crust and, as a consequence, the formation of both mafic melts of the shoshonite type and anatectic crustal melts of the adakite type. The mixing of these melts led to the formation of the parent magmas of the Amudzhikan magmatic association. The crustal component in the source was of a heterogeneous nature and was finally formed as a result of the Early Cretaceous collision event. It is characterized by upper-crustal isotopic parameters: an increased Rb/Sr and U/Pb ratio and a decreased Sm/Nd ratio in the source. The mantle component is represented by the material of the enriched lithospheric mantle of the Central Asian fold belt, the formation of which is associated with subduction processes at the stage of closure of the Mongol-Okhotsk paleoocean. Metasomatic transformation of the mantle with the introduction of melts and fluids with isotopic parameters of an EMII-type source or upper crust occurred at this stage.

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Раннемеловые Коллизионные Гранитоиды Древнестанового Комплекса Селенгино-Станового Супертеррейна Центрально-Азиатского Подвижного Пояса

Cited by 3 publications

References 0 publications

Mineralogical Composition, Metamorphic Parameters and Protoliths of Granulites From the Larba Block of the Dzhugdzhur-Stanovoy Fold Area

Mineralogical Composition, Metamorphic Parameters and Protoliths of Granulites From the Larba Block of the Dzhugdzhur-Stanovoy Fold Area

The Age of Gold Mineralization at the Elga Deposit (Mongol-Okhotsk Fold Belt): 40ar/39ar Geochronological Constraints

Amudzhikan volcano-plutonic association of the eastern part of the West-Stanovoy superterrane (Central Asian orogenic belt): age, sources, and tectonic setting

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