Email this article HELIUM ISOTOPIC COMPOSITION IN ALKALINE INTRUSIONS OF THE HOVSGOL AREA, NORTHWESTERN MONGOLIA
- Authors: Vrublevskii V.V.1, Kozlov E.N.2, Fomina E.N.2, Gertner I.F.1, Vishnevskii A.V.3,4, Shelepaev R.A.3,4, Semiryakov A.S.1, Sidorov M.Y.2, Gudkov A.V.2, Petlina A.A.1, Udoratina O.V.5
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Affiliations:
- National Research Tomsk State University
- Geological Institute of Kola Science Centre of Russian Academy of Sciences
- Sobolev Institute of Geology and Mineralogy, Siberian branch of Russian Academy of Sciences
- National Research Novosibirsk State University
- Institute of Geology Komi, Ural branch of Russian Academy of Sciences
- Issue: Vol 512, No 2 (2023)
- Pages: 207-211
- Section: ГЕОХИМИЯ
- URL: https://journals.rcsi.science/2686-7397/article/view/140409
- DOI: https://doi.org/10.31857/S2686739723600315
- EDN: https://elibrary.ru/MTDLPQ
- ID: 140409
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Abstract
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.
About the authors
V. V. Vrublevskii
National Research Tomsk State University
Author for correspondence.
Email: vasvr@yandex.ru
Russian, Tomsk
E. N. Kozlov
Geological Institute of Kola Science Centre of Russian Academy of Sciences
Email: vasvr@yandex.ru
Russian, Apatity
E. N. Fomina
Geological Institute of Kola Science Centre of Russian Academy of Sciences
Email: vasvr@yandex.ru
Russian, Apatity
I. F. Gertner
National Research Tomsk State University
Email: vasvr@yandex.ru
Russian, Tomsk
A. V. Vishnevskii
Sobolev Institute of Geology and Mineralogy, Siberian branch of Russian Academy of Sciences; National Research Novosibirsk State University
Email: vasvr@yandex.ru
Russian, Novosibirsk; Russian, Novosibirsk
R. A. Shelepaev
Sobolev Institute of Geology and Mineralogy, Siberian branch of Russian Academy of Sciences; National Research Novosibirsk State University
Email: vasvr@yandex.ru
Russian, Novosibirsk; Russian, Novosibirsk
A. S. Semiryakov
National Research Tomsk State University
Email: vasvr@yandex.ru
Russian, Tomsk
M. Yu. Sidorov
Geological Institute of Kola Science Centre of Russian Academy of Sciences
Email: vasvr@yandex.ru
Russian, Apatity
A. V. Gudkov
Geological Institute of Kola Science Centre of Russian Academy of Sciences
Email: vasvr@yandex.ru
Russian, Apatity
A. A. Petlina
National Research Tomsk State University
Email: vasvr@yandex.ru
Russian, Tomsk
O. V. Udoratina
Institute of Geology Komi, Ural branch of Russian Academy of Sciences
Email: vasvr@yandex.ru
Russian, Syktyvkar
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