ИЗОТОПНЫЕ (SM-ND, PB-PB И ?34S) И ГЕОХИМИЧЕСКИЕ ХАРАКТЕРИСТИКИ МЕТАОСАДОЧНЫХ ПОРОД Байкало-Патомского ПОЯСА (СЕВЕРНОЕ ЗАБАЙКАЛЬЕ) И ЭВОЛЮЦИЯ ОСАДОЧНОГО БАССЕЙНА В НЕОПРОТЕРОЗОЙСКОЕ ВРЕМЯ, "Петрология"

Чугаев, А.В.; Будяк, А.Е.; Чернышев, И.В.; Дубинина, Е.О.; Гареев, Б. И.; Шатагин, К.Н.; Тарасова, Ю. И.; Горячев, Н.А.; Скузоватов, С.Ю.

doi:10.7868/s0869590318030019

Cited by 4 publications

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“…Среднее значение δ 34 S меняется: от -4.3 в ранних пиритах (Py-1 и Py-2) и -4.6‰ в раннем пирротине (Po-1) → с незначительным утяжелением в высокосернистом Po-2 (δ 34 S = -3.5 ‰) и Py-3 (δ 34 S = -2.9 ‰) и с значительным облегчением значений в Py-4 (δ 34 S = -7.9 ‰). Разброс значений δ 34 S в пирите из безрудных отложений аунакитской свиты превышает 6‰ (-7.9 --1.2 ‰) [45,73]. Как видно, полученные локальным методом значения δ 34…”

Section: изотопно-геохимические данныеunclassified

“…В.П (au 1-3 ) -вмещающие породы аунакитской свиты отобранные за пределами рудной зоны месторождения Угахан. S tot -общая сера, определенная валовым методом[45,73] Таблица 4. Результаты изучения изотопного состава Pb, а также содержаний микропримесей U, Th и Pb в сульфидах золоторудной минерализации месторождения Ыкан.…”

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Gold Mineralization Coincident With Amphibolite Facies Metamorphism: Ykan Deposit (Baikal-Patom Belt)

Budyak,

Tarasova,

Chugaev

et al. 2024

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Black shale deposits whose metamorphic grade exceeds greenschist-facies of regional metamorphosed rocks are considered by most researchers exclusively from the point of view of the potential to mine alluvial gold. The article presents the results of the study on the Ykan deposit located within the epidote-amphibolite facies zone and its comparison with previously studied deposits localized in the greenschist facies alteration zone. It was found that the Ykan gold deposit is lithologically and stratigraphically confined to the contact between carbonaceous phyllite shales and sandstones of the Aunakit Formation in the anticlinal limb, which is one of the main factors controlling ore localization. The ore mineralization of the deposit is represented by the change of the early diathagenetic pyrite (py-I, py-II) → metamorphogenic pyrrhotite (po, cpy, asp) → metamorphogenic-metasomatic pyrite-polymetallic (cpy, asp, py-III, gln, sph, pn, mrc) → post-ore pyrite (py-IV) associations. The ore stage is characterized by the highest possible TP parameters in the early ore metamorphic phase and their decrease in the ore-productive phase. Data on variations in the isotopic composition of sulfur and lead indicate that they were transported into the ore fluid from the host meta-sedimentary strata of the Aunakit Formation. Comparison of the obtained parameters of the Ykan deposit with the previously studied deposits of Sukhoi Log, Golets the Highest, Ugakhan and Krasnyi made it possible to conclude that we are correct in assigning the Ykan deposit to the group of deposits of the Sukholozhsky genetic type.

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Section: изотопно-геохимические данныеunclassified

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Gold Mineralization Coincident With Amphibolite Facies Metamorphism: Ykan Deposit (Baikal-Patom Belt)

Budyak,

Tarasova,

Chugaev

et al. 2024

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Sources and evolution of miocene-pleistocene alkaline magmatism in the north-east part of the arabian plate (data from Sr–Nd–Pb isotopic systematics and K–Ar geochronometry)

Chugaev,

Parfenov,

Lebedev

et al. 2024

Geohimiâ

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A geochronological and isotope-geochemical study of alkaline basalts from three areas of young magmatism within the northeastern part of the Arabian Plate (Southeastern Turkey), Batman, Kurtalan and Alemdağ, was carried out. The obtained isotope data have indicated that the volcanism in the studied region developed over 5 mln years from the end of Miocene to the mid of Pleistocene during four pulses separated by breaks in magmatic activity: 6.1-4.9 Ma (Batman area, hawaiites), ~3.0 Ma (Alemdağ plateau, phase I, basalts), 2.0-1.9 Ma (Alemdağ plateau, phase II, tephrites), and 1.5-1.3 Ma (Alemdağ plateau, phase III, basalts; Kurtalan area, basalts). A comparison of spatial-temporal regularities of magmatic activity evolution in the studied part of the Arabian Plate and within the largest basalt plateau of Arabian foreland, Karacadağ plateau, located to the west, was carried out. The results of Sr-Nd-Pb isotope-geochemical studies show that the development of young basalt volcanism within the northern part of the Arabian Plate was characterized at different time by participation of various mantle sources in magma generation under this region. Initial pulses of magmatic activity are associated with melting of Arabian subcontinental lithospheric mantle (SCLM). The processes of fractional crystallization combined with crustal assimilation (AFC) have played an important role in the petrogenesis of lavas as well. In the subsequent time, a deep mantle source (PREMA) with a depleted isotopic composition of Sr and Pb played a leading role in the formation of basaltic magmas of increased alkalinity. The melts generated by this source were mixed with the SCLM material in various proportions at different stages of magmatism with a limited participation of AFC processes in the petrogenesis of the rocks. It was concluded that young basalt volcanism of elevated alkalinity in the northeast of the Arabian Plate is not related to the collision of the Eurasian and Arabian plates genetically, but presumably manifested here as a result of the migration of the initial rift geodynamic set from the Red Sea basin to the north along Levantine and East Anatolian transform faults with associated convective wave flows in the lower part of mantle under this part of the Earth.

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Orogenic gold deposits of the Northern Transbaikalia (Russia): geology, age, sources and genesis

Chugaev

2024

Geohimiâ

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The results of long-term geochronological and isotope-geochemical studies of mesothermal gold deposits of orogenic type in the world’s largest Lena metallogenic province are summarized, and the evaluation of existing conceptions of their genesis is given. On the basis of geochronological data the presence of three ore-forming events manifested in the region in the Paleozoic time is proved. The early Late Ordovician-Early Silurian (450-430 Ma) event is associated with large-scale vein-embedded gold-sulfide mineralization in Neoproterozoic carbonaceous terrigenous-carbonate rocks of the Baikal-Patom fold belt (BPB). In terms of time, ore formation coincides with the development of metamorphic processes in the region. The reactivation of hydrothermal action in the BPP, which led to the formation of vein gold-quartz mineralization, occurred in the Middle Carboniferous (340-330 Ma) and was produced by post-collisional granitoid magmatism. The most recent ore-forming event occurred in the Early Permian (290-280 Ma) and was manifested exclusively in the Precambrian structures of the Baikal-Muya fold belt (BMP). It was synchronous with the development of intraplate alkaline and subalkaline magmatism in the region. Isotopic-geochemical data (87Sr/86Sr, 143Nd/144Nd, Pb-Pb, and δ34S) indicate that the mesothermal ore-forming systems of the Northern Transbaikalia were heterogeneous in their isotopic characteristics, which distinguishes them from ore-magmatic (intrusion related type) systems. Comparison of Sr, Nd and Pb isotopic composition of ores and rocks of the region, including magmatic rocks of the same age as gold mineralization, proves the leading role of the Precambrian continental crust in the supply of mineral-forming components to the hydrothermal systems of gold deposits. The contribution of the magmatic source of matter in the genesis of orogenic gold mineralization was limited and is established only for the Early Permian ore-forming systems of the BMP, for which the input of metals from alkaline melts of basite composition is assumed.

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Cited by 4 publications

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Gold Mineralization Coincident With Amphibolite Facies Metamorphism: Ykan Deposit (Baikal-Patom Belt)

Gold Mineralization Coincident With Amphibolite Facies Metamorphism: Ykan Deposit (Baikal-Patom Belt)

Sources and evolution of miocene-pleistocene alkaline magmatism in the north-east part of the arabian plate (data from Sr–Nd–Pb isotopic systematics and K–Ar geochronometry)

Orogenic gold deposits of the Northern Transbaikalia (Russia): geology, age, sources and genesis

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