Возраст Гранодиорит-Порфиров И Березитов Дарасунского Золоторудного Поля (Восточное Забайкалье, Россия)

Чернышев, И. В.; Прокофьев, В.Ю.; Бортников, Н.С.; Чугаев, А В; Гольцман, Ю В; Lebedev, V.A.; Ларионова, Ю.О.; Зорина, Л.Д.

doi:10.7868/s0016777014010031

Cited by 3 publications

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“…Золоторудные месторождения Дарасунского узла МС, по данным Rb-Sr датирования, формировались в интервале 150-144 млн лет назад [33]. Несколько более древние возрасты (для Дарасунского месторождения -159.6 и вмещающих гранодиорит-порфиров -160.5 млн лет) приведены в работе [43].…”

Section: связь металлогении с окислительными условиямиunclassified

Postcollision Magmatism of Western Sector of the Mongol-Okhotsk Orogenic Belt: Oxidation Conditions and Metallogenic Zonality

Mishin¹,

Kirillova²,

Merkulova³

et al. 2019

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Поступила в редакцию 29 марта 2018 г. ВВЕДЕНИЕ За последние годы появились новые методы и подходы к изучению геологии и металлогении территорий. Одним из таких подходов является изучение влияния окислительных условий на геохимическую зональность и металлогеническую специализацию магматических пород. Нами данная проблема изучена в пределах западного сектора Моголо-Охотской сутурной зоны (рис. 1). При изменении окислительных условий большинство элементов, в особенности рудных, меняют свою валентность, а разновалентные формы по-разному участвуют в геохимических процессах [3]. Например, растворимость в силикатных расплавах двухвалентного олова на порядок выше растворимости четырехвалентной формы [30], поэтому на геохимической диаграмме валентные формы элементов занимают поля, как правило, резко различающиеся по геохимическим характеристикам [54]. Переход из одного валентного состояния в другое (redox реакция) при фиксированной температуре и давлении зависит от редокс пары, состава расплава и, главным образом, от летучести кислорода. При региональных исследованиях наиболее доступным показателем летучести кислорода является соотношение УДК 550.83:552.11 ОКИСЛИТЕЛЬНЫЕ УСЛОВИЯ ФОРМИРОВАНИЯ ПОСТКОЛЛИЗИОННОГО МАГМАТИЗМА И МЕТАЛЛОГЕНИИ ЗАПАДНОГО СЕКТОРА МОНГОЛО-ОХОТСКОГО ОРОГЕННОГО ПОЯСА Л. Ф. Мишин, Г.Л. Кириллова, Т.В. Меркулова, Е.А . КоноваловаЗабайкальский сектор Монголо-Охотского орогенного пояса имеет выдержанную геохимическую и металлогеническую зональности. Осевая зона пояса, контролируемая с севера Монголо-Охотской сутурной зоной, сложена восстановленными породами ильменитовой серии. К породам ильменитовой серии приурочены месторождения и проявления олова, вольфрама и редких металлов, выделенных ранее С.С. Смирновым как редкометалльный пояс. Восстановленные породы с севера и юга обрамляются окисленными породами магнетитовой серии с халькофильной минерализацией. Породам ильменитовой серии соответствуют аномалии с низкими значениями гравитационного и магнитного полей, а окисленным породам магнетитовой серии -аномалии с повышенными значениями.Ключевые слова: ильменитовая серия, магнетитовая серия, мезозой, Монголо-Охотский орогенный пояс, Забайкалье. Postcollision magmatism of western sector of the Mongol-Okhotsk orogenic belt: oxidation conditions and metallogenic zonalityThe Transbaikal sector of the Mongol-Okhotsk orogenic belt displays a well-consistent geochemical and metallogenic zonality. The axial zone of the belt which is controlled by the Mongol-Okhotsk suture zone from the north is composed of the recycled ilmenite-series rocks. Tin, tungsten, and rare metals deposits and occurrences previously distinguished by S.S. Smirnov as a rare metal belt are con ned to the ilmenite-series rocks. The recovered rocks are framed from the north and south with oxidized magnetite-series rocks with chalcophile mineralization. The distribution zones of the ilmenite-series rocks correspond to anomalies with low values of gravity and magnetic  elds, whereas the oxidized rocks of the magnetite-series correspond to the anomal...

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Section: связь металлогении с окислительными условиямиunclassified

Postcollision Magmatism of Western Sector of the Mongol-Okhotsk Orogenic Belt: Oxidation Conditions and Metallogenic Zonality

Mishin¹,

Kirillova²,

Merkulova³

et al. 2019

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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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Bismuthite from Au–Bi and Post-Gold Sb Mineralizations within the Darasun Deposit, Eastern Transbaikalya

Spiridonov,

Krivitskaya,

Brysgalov

et al. 2023

Zapiski Vserossijskogo mineralogičeskogo obŝestva

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The Late Jurassic late-orogenic volcanogenic-plutonogenic Darasun deposit of the gold-sulphide-quartz formation holds Au–Bi and post-gold Sb mineralizations. Carbonate-quartz-sulfide veins in Western part of the deposit are surrounded by listvenite rims. Their golden ores were formed under conditions of low activity of S2, they contain pyrrhotine, arsenopyrite, chalcopyrite, pyrite, bismuthate I (Bi1.89–1.98Sb0.11–0.02)2S3, galenobismuthite, nests of bismuth and ikunolite Bi4S3. There is observed exsolution of ikunolite mainly into the native bismuth (Bi0.98–1Sb0.02–0) and bismuthite-II; the composition of bismuthite-II in center of aggregates with the bismuth is (Bi1.96–1.97Sb0.04–0.03)2S3, whereas the composition on their periphery is an more antimonian one is (Bi1.91–1.92Sb0.09–0.08)2S3. While the high fineness gold (970–935 ‰) arose there by the action of gold-bearing hydrothermal solutions, the native bismuth has been partly replaced with maldonite. Jonassonite and Pb–Bi sulphosaults (mainly, cosalite Pb2Bi2S5) were formed later in these ores. The overlaying Sb mineralization has given formation not of antimonite (stibnite), but of Pb–Sb sulphosaults (moeloite Pb6Sb6S15, etc.), pseudomorphs of chalcostibite after chalcopyrite, as well as aurostibite AuSb2 after minerals of gold. The replacement of maldonite by aurostibite was resulted in appearance of bismuthate III. The probable replacement reaction is: 2Au2Bi + 6Sb solv. + + 3Sb2S3 solv. → 4AuSb2 + Bi2S3. Bismuthite III (Bi1.72–1.96Sb0.29–0.94)2(S2.98–3Se0–0.02)3, containing 1–7 wt % of Sb, is a product of the maldonite replacement by aurostibite. Moeloite and stibian bismuthate III arose by the Sb mineralization overlaying ores with cosalite. The probable replacement reaction is: 3Pb2Bi2S5 + 3Sb2S3 solv. → Pb6Sb6S15 + 3Bi2S3. Stibian bismuthite-III contains 4–17 wt % of Sb in its composition (Bi1.36–1.71Sb0.64–0.29)2S3. Appearance of bismuthite with the Sb mineralization where it was developed over ores with native bismuth, maldonite and Pb–Bi sulphosaults is the evidence of key role of the mass action law in mineral-forming processes.

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Возраст Гранодиорит-Порфиров И Березитов Дарасунского Золоторудного Поля (Восточное Забайкалье, Россия)

Cited by 3 publications

References 0 publications

Postcollision Magmatism of Western Sector of the Mongol-Okhotsk Orogenic Belt: Oxidation Conditions and Metallogenic Zonality

Postcollision Magmatism of Western Sector of the Mongol-Okhotsk Orogenic Belt: Oxidation Conditions and Metallogenic Zonality

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

Bismuthite from Au–Bi and Post-Gold Sb Mineralizations within the Darasun Deposit, Eastern Transbaikalya

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