Research output: Contribution to journal › Article › peer-review
He Isotopic Composition of Alkaline Intrusions of the Hovsgol Area, Northwestern Mongolia. / Vrublevskii, V. V.; Petlina, A. A.; Gudkov, A. V. et al.
In: Doklady Earth Sciences, Vol. 512, No. 2, 10.2023, p. 953-956.Research output: Contribution to journal › Article › peer-review
}
TY - JOUR
T1 - He Isotopic Composition of Alkaline Intrusions of the Hovsgol Area, Northwestern Mongolia
AU - Vrublevskii, V. V.
AU - Petlina, A. A.
AU - Gudkov, A. V.
AU - Sidorov, M. Yu
AU - Semiryuakov, A. S.
AU - Shelepaev, R. A.
AU - Vishnevskii, A. V.
AU - Gertner, I. F.
AU - Fomina, E. N.
AU - Kozlov, E. N.
AU - Udoratina, O. V.
N1 - This work was supported by the Russian Science Foundation, project no. 19–77–10039P (He isotopic analysis) and the Ministry of Science and Higher Education of the Russian Federation (state contract of National Research Tomsk State University, project no. 0721–2020–0041; geology of the plutons). We are grateful to colleagues from the National Research Tomsk State University and the Institute of Geology and Geochemistry, Ural Branch, Russian Academy of Sciences, for help in analytical studies. The reviews of A.I. Buikin (Institute of Geochemistry and Analytical Chemistry, Russian Academy of Sciences, Moscow) and O.V. Yakubovich (Institute of Precambrian Geology and Geochronology, Russian Academy of Sciences, St. Petersburg) are sincerely acknowledged. Публикация для корректировки.
PY - 2023/10
Y1 - 2023/10
N2 - 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.
AB - 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.
KW - He isotopes
KW - Hovsgol Trough
KW - Northwestern Mongolia
KW - alkaline and subalkaline magmatism
KW - mantle–crustal interaction
UR - https://www.scopus.com/record/display.uri?eid=2-s2.0-85168687541&origin=inward&txGid=640ed833d2b06c71f1c874a79886d6f1
UR - https://www.mendeley.com/catalogue/0bc961f3-cbd5-3258-b020-4bcef40cfb9a/
U2 - 10.1134/S1028334X23601372
DO - 10.1134/S1028334X23601372
M3 - Article
VL - 512
SP - 953
EP - 956
JO - Doklady Earth Sciences
JF - Doklady Earth Sciences
SN - 1028-334X
IS - 2
ER -
ID: 59548927