Age and petrogenesis of scapolite gabbro from the Bambuy intrusion (Vitim plateau, Russia) and their tectonic significance

Избродин, И. А.; Doroshkevich, A. G.; Рампилов, М. О.; Ласточкин, Е. И.; Саватенков, В. М.; Посохов, В. Ф.; Хубанов, В. Б.; Redina, Anna A.

doi:10.1007/s00531-022-02202-4

Cited by 3 publications

(2 citation statements)

References 74 publications

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“…Схема размещения массивов палеозойских -раннемезозойских щелочных пород Западного Забайкалья (а); сводные гистограммы распределения геохронологических данных для пород массива Бурпала в сравнении с щелочными, основными и кислыми породами Западного Забайкалья (б). Возрастные параметры взяты из работы[Izbrodin et al, 2020[Izbrodin et al, , 2022.…”

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GEOCHRONOLOGY OF ALKALINE ROCKS FROM THE BURPALA MASSIF (NORTHERN PRIBAIKALYE): NEW U-Pb DATA

Izbrodin,

Doroshkevich,

Malyutina

et al. 2024

Geodin. tektonofiz.

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Geochronological studies have been made on the main types of rocks from the Burpala alkaline massif and two gabbro and gabbro-diorite dikes located nearby. U-Pb LA-SF-ICP-MS zircon geochronology for the Burpala massif yielded a date of 294±2 Ma for gabbro crystallization, 607±4 Ma for diorite crystallization, 298±2 and 296±2 Ma for melanocratic alkaline and nepheline syenite crustallization, 291±2 and 293±3 for quartz and quartz-containing syenite crystallization, and 293±3 Ma for alkaline granite crystallization. The stage of formation of the massif rocks (298–291 Ma) coincides with the formation period of alkaline rocks from the Synnyr pluton and some alkaline complexes of the Vitim segment of Transbaikalia and confirms a widespread occurrence of post-collisional alkaline magmatism in Western Transbaikalia.

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“…Scheme of location of the Paleozoic -Early Mesozoic alkaline rocks of Western Transbaikalia (a); cumulative histograms of the distribution of geochronological data for the rocks of the Burpala massif in comparison with alkaline, basic, and acidic rocks of Western Transbaikalia (б). Age parameters are taken from[Izbrodin et al, 2020[Izbrodin et al, , 2022.…”

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GEOCHRONOLOGY OF ALKALINE ROCKS FROM THE BURPALA MASSIF (NORTHERN PRIBAIKALYE): NEW U-Pb DATA

Izbrodin,

Doroshkevich,

Malyutina

et al. 2024

Geodin. tektonofiz.

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He Isotopic Composition of Alkaline Intrusions of the Hovsgol Area, Northwestern Mongolia

Vrublevskii,

Petlina,

Gudkov

et al. 2023

Dokl. Earth Sc.

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The He isotopic composition of fluid inclusions in magnetite of alkaline and subalkaline intrusion of the Hovsgol region, Northwestern Mongolia, is studied. The measured 4He content varies from 6.6 × 10–7 to 114 × 10–7 cm3/g. The 3He/4He isotope ratio of most samples is 0.23–0.59 Ra indicating the presence of He from different sources in magmatic fluid. The maximum of mantle He (2.51 Ra) is observed in magnetite of subalkali gabbro. The mantle He component was ~40–60% during the generation of parental magma with possible involvement of subcontinental lithospheric mantle material or a plume-like reservoir less enriched in 3He. The mantle He component did not exceed 10–15% during the evolution of the foidoitic and alkali-syenitic melts because of mixing with crustal radiogenic He. We suggest the interaction of intrusions with fragments of the Precambrian accretionary–collision complexes of the Tuva–Mongolian Terrane. This mixing of He isotopes in melts and fluids can serve as indirect evidence of the development of mantle magmatism at the active continental margin.

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Helium Isotopic Composition in Alkaline Intrusions of the Hovsgol Area, Northwestern Mongolia

Vrublevskii,

Petlina,

Gudkov

et al. 2023

Doklady Rossijskoj akademii nauk. Nauki o Zemle

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The helium isotope composition of fluid inclusions has been studied in magnetite from alkaline and subalkaline intrusions of the Hovsgol area in NW Mongolia. The measured content of 4He is in the range from 6.6 × 10–7 to 114 × 10–7 см3/г. The 3He/4He isotopic ratio of most samples varies within 0.23–0.59 Ra and may indicate the presence of helium from different sources in the magmatogenic fluid. The largest amount of mantle He (2.51 Ra) is hosted by the magnetite of the subalkaline gabbro. During the generation of primary magma, which probably involved either SCLM-type material or a plume-like reservoir less enriched in 3He, the mantle component accounted for approximately 40–60%. In the evolution of foid and alkali-syenite melts, its share did not exceed ~10–15% due to mixing with crustal radiogenic He. We assume that the intrusions interacted with fragments of Precambrian accretionary-collisional complexes of the Tuva-Mongolian terrane. Such mixing of He isotopes in melts and fluids may be regarded as circumstantial evidence supporting the development of mantle magmatism at the active continental margin.

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Age and petrogenesis of scapolite gabbro from the Bambuy intrusion (Vitim plateau, Russia) and their tectonic significance

Cited by 3 publications

References 74 publications

GEOCHRONOLOGY OF ALKALINE ROCKS FROM THE BURPALA MASSIF (NORTHERN PRIBAIKALYE): NEW U-Pb DATA

GEOCHRONOLOGY OF ALKALINE ROCKS FROM THE BURPALA MASSIF (NORTHERN PRIBAIKALYE): NEW U-Pb DATA

He Isotopic Composition of Alkaline Intrusions of the Hovsgol Area, Northwestern Mongolia

Helium Isotopic Composition in Alkaline Intrusions of the Hovsgol Area, Northwestern Mongolia

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