<sup>190</sup>Pt–<sup>4</sup>He-ВОЗРАСТ ПЛАТИНОМЕТАЛЬНЫХ РУДОПРОЯВЛЕНИЙ ЩЕЛОЧНО-УЛЬТРАОСНОВНОГО МАССИВА КОНДЁР (ХАБАРОВСКИЙ КРАЙ, РОССИЯ)

Мочалов, А. Г.; Якубович, О.В.; Бортников, Н.С.

doi:10.7868/s0869565216230183

Cited by 3 publications

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“…Для детальной разработки нового 190 Pt- 4 He метода использовались минералы платиновой группы россыпного месторождения Кондер с коренным источником в одноименном щелочноультраосновном массиве (Хабаровский край, Россия) [3]. 190 Pt- 4 He возраст изоферроплатины месторождения составил 129 ± 6 млн лет [5], что полностью соответствует возрасту платиноносных дунитов и их производных [18]. Значения 190 Pt- 4 He возраста, полученные для МПГ известных россыпных месторождений платиновых металлов Дальнего Востока (Кондер, Чад, Инагли, Гальмоэнан), совпали с возрастом продуцирующих их массивов [19].…”

Section: метод материалы и результаты исследованияunclassified

Isotopic Age of Native Platinum From Andesitic Fluidolites of the Poperechnoye Deposit (Malyi Khingan, Russia)

Khanchuk¹,

Mochalov²,

Rasskazov³

et al. 2020

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Поступила в редакцию 25 марта 2019 г. The 190 Pt-4 He age of the isoferroplatinum from andesitic  uid-explosive breccias ( uidolites, a new type of platinum-bearing rocks) of the Poperechnoye deposit (Malyi Khingan, Russia) estimated as 125 ± 21 Ma correlates well with the peak magmatic activity in the Bureya massif and East Asia caused by upwelling of slab-window asthenosphere in a transform continental margin setting following the cessation of subduction of the Izanagi Plate under the composite Jiamusi-Bureya-Khanka terrane in Jurassic times.

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Section: метод материалы и результаты исследованияunclassified

Isotopic Age of Native Platinum From Andesitic Fluidolites of the Poperechnoye Deposit (Malyi Khingan, Russia)

Khanchuk¹,

Mochalov²,

Rasskazov³

et al. 2020

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“…Датировки приведены в координатах возраст -температура закрытия соответствующей изотопной системы; 1-8 -изотопные датировки: 1 -U/Pb мономинеральные (циркон, бадделеит); 2 -Sm/Nd изохронные (вал+минералы), 3-6 -40 Ar/ 39 Ar мономинеральные: 3 -по амфиболам, 4 -по слюдам, 5 -по полевым шпатам, 6 -по редким минералам чароититов (токкоит, тинаксит, франкаменит); 7 -190 Pt/ 4 He -по минералам группы платины; 8 -Re/Os изохронные, по сульфидам; 9 -графики распределения плотностей вероятности возрастов: а -магматитов, б -рудных образований, метасоматитов и/или чароититов. Раннемеловые «датировки» дунитов, щёлочно-земельных клинопироксенитов (кроме косьвитов) и платиновой минерализации массивов Кондёр (ККЮМП) и Инагли (ЦАМП), по [7,8,16,19,20,30,35,37,45,48] -условные, поскольку отражают, согласно представлениям [8; 11-13, 19-21, 29, 41 и др. ], к которым мы присоединяемся, время не их первичной кристаллизации, а протекания этапов посткристаллизационной активизации, т.е.…”

Section: рис 3 геологическая схема рудопроявления виктория (по [6] с ...unclassified

The Age of Gold Mineralization in the Ketkap-Yuna Igneous Province, Formational Types of Gold-Bearing Complexes, and Time Differences in the Occurrence of Late Mesozoic Magmatism in Different Parts of the Aldan Shield

Polin¹,

Zvereva²,

Travin³

et al. 2022

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The first 40Ar/39Ar isotopic age data for hydrothermal vein gold mineralization in the late Mesozoic Ketkap-Yuna igneous province of the Aldan shield confirm the correlation between this style of mineralization and the Early Cretaceous sub-alkali magmatism, which was established by geological observations. The combination of geological characteristics and U-Pb data on magmatites enabled us to indirectly determine the age of the highly productive bimetasomatic «massif-skarn» type of mineralization associated with sub-alkali magmatogenic formations of the province. The isotopic dating of magmatites and gold mineralization in the Ketkap-Yuna igneous province and other late Mesozoic igneous provinces of the Aldan shield shows consistency in the ages of ore-bearing magmatites and associated ores. The delay in time of the Late Mesozoic magmatism manifestations in the Ketkap-Yuna igneous province and the associated gold mineralization relative to the intensification of tectonomagmatic processes in the Western and Central Aldan, as well as differences in the correlations of different types of igneous formations in the provinces, are explained by the characteristics of the regional tectonic structure and, as a consequence, the specific nature of the Late Mesozoic magmatism development in different parts of the Aldan shield. Two large areas of the late Mesozoic intensification of tectonomagmatic processes are identified in the Aldan shield that differ both in the time of the onset of polyformational magmatism and the accompanying different-type mineralization, and in the dominant formational type of magmatites: West-Central Aldan, on the one hand, and East Aldan, on the other. The former is characterized by continuous magmatic activity from the Berriasian to the early Albian (≈ 30 Ma) and predominance of the leucitite–alkali-(foid)-syenite formation, and the latter by manifestations of magmatism over a timeframe half of the above period (≈ 15 Ma) and predominance of the subalkaline diorite-granodiorite-granite formation. The termination of the late Mesozoic magmatism in both areas was subsynchronous. A «set» of magmatogenic formations in them is also similar: leucite-alkaline-(foid)-syenite with alkali granites, monzonite (shonkinite)-syenite and subalkaline diorite-granodiorite-granite. The Coniacian–Santonian outbreak of alkali volcano-plutonism during the intensification of tectonomagmatic processes is characteristic of the East Aldan region, which manifested itself in the Ketkap-Yuna igneous province after a long (about 30 Ma) period of amagmatism.

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“…Дуниты неоднородны по составу (в них варьируют содержания Fе, Са, Ni и др.) и зернистости оливина, распределению и составу хромшпинелидов и степени метаморфогенной рекристаллизации и метасоматической перекристаллизации (сохранности первичных кумулятивных структур) (Косыгин и Приходько, 1994;Мочалов, 2019;Некрасов и др., 1994;. Их фациальная неоднородность выражена в зональности первого порядка, обусловленной сменой краевых эндоконтактовых мелкозернистых дунитов мелко-, средне-и крупнозернистыми дунитами к центру.…”

Section: геологическая характеристика массива кондёрunclassified

New geochemical and isotopic (Rb-Sr and Sm-Nd) data for the rocks of the alkali-ultrabasic massif Kondyor of the Aldan Shield (Khabarovsk Territory, Russia)

Саватенков¹,

Mochalov²

2022

Vestnik SPbSU. Earth Sciences

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The chemical composition and Rb-Sr and Sm-Nd isotope characteristics of various rocks that make up the alkali-ultramafic Kondyor massif of the Aldan Shield were studied: dunites, clinopyroxenites, gabbro, kosvites, alkaline syenites. Ultrabasic rocks of the early stage (dunites, clinopyroxenites) have a significant metasomatic alteration associated with the intrusion of a dike complex of alkaline rocks. The petrochemical features of dunites and clinopyroxenites indicate that these rocks are cumulative phases that successively crystallized from picritic melt at an early stage of the formation of the massif. Gabbro and kosvites of the marginal series were formed from the residual melt after the crystallization of dunites and clinopyroxenites. The Rb-Sr and Sm-Nd isotopic characteristics in the rocks of the early intrusion stage (dunites, clinopyroxenites, gabbro) indicate that these rocks were formed with the participation of the host rock contamination processes. The isotope-geochemical characteristics of the rocks of the dike complex (kosvites and alkaline rocks of the dunite core) indicate that these rocks crystallized from a deep melt that was not significantly contaminated by the continental crust. Differences in isotopic characteristics between ultramafic rocks and rocks of the dike complex of the dunite "core" - kosvites and alkaline rocks, suggest at least two sources of melts that participated in the formation of the Konder massif: (1) an early, deep-seated melt that formed ultrabasic rocks at the upper level, and also kosvites, plagioclase pyroxenites and gabbro of the outer “ring” with a significant degree of contamination; (2) late, differentiated (monzonite and alkaline-syenite) deep-seated melt (far from the contaminant) that became the source of kosvite and alkaline rock dikes in the central part of the Konder massif.

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¹⁹⁰Pt–⁴He-ВОЗРАСТ ПЛАТИНОМЕТАЛЬНЫХ РУДОПРОЯВЛЕНИЙ ЩЕЛОЧНО-УЛЬТРАОСНОВНОГО МАССИВА КОНДЁР (ХАБАРОВСКИЙ КРАЙ, РОССИЯ)

Cited by 3 publications

References 0 publications

Isotopic Age of Native Platinum From Andesitic Fluidolites of the Poperechnoye Deposit (Malyi Khingan, Russia)

Isotopic Age of Native Platinum From Andesitic Fluidolites of the Poperechnoye Deposit (Malyi Khingan, Russia)

The Age of Gold Mineralization in the Ketkap-Yuna Igneous Province, Formational Types of Gold-Bearing Complexes, and Time Differences in the Occurrence of Late Mesozoic Magmatism in Different Parts of the Aldan Shield

New geochemical and isotopic (Rb-Sr and Sm-Nd) data for the rocks of the alkali-ultrabasic massif Kondyor of the Aldan Shield (Khabarovsk Territory, Russia)

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190Pt–4He-ВОЗРАСТ ПЛАТИНОМЕТАЛЬНЫХ РУДОПРОЯВЛЕНИЙ ЩЕЛОЧНО-УЛЬТРАОСНОВНОГО МАССИВА КОНДЁР (ХАБАРОВСКИЙ КРАЙ, РОССИЯ)

Cited by 3 publications

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Isotopic Age of Native Platinum From Andesitic Fluidolites of the Poperechnoye Deposit (Malyi Khingan, Russia)

Isotopic Age of Native Platinum From Andesitic Fluidolites of the Poperechnoye Deposit (Malyi Khingan, Russia)

The Age of Gold Mineralization in the Ketkap-Yuna Igneous Province, Formational Types of Gold-Bearing Complexes, and Time Differences in the Occurrence of Late Mesozoic Magmatism in Different Parts of the Aldan Shield

New geochemical and isotopic (Rb-Sr and Sm-Nd) data for the rocks of the alkali-ultrabasic massif Kondyor of the Aldan Shield (Khabarovsk Territory, Russia)

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¹⁹⁰Pt–⁴He-ВОЗРАСТ ПЛАТИНОМЕТАЛЬНЫХ РУДОПРОЯВЛЕНИЙ ЩЕЛОЧНО-УЛЬТРАОСНОВНОГО МАССИВА КОНДЁР (ХАБАРОВСКИЙ КРАЙ, РОССИЯ)