UDC 552.3:551.14 + 550.93
https://doi.org/10.26516/2541-9641.2026.2.66
EDN: AUSBYE
Review of the Isotope Systematics of Noble Gases in Global Core-Mantle Boundary Inhomogeneity in Southern Pacific and Africa: Prospects of the Equivalent Systematics in Asia
S.V. Rasskazov1,2, I.S. Chuvashova1,2, T.A. Yasnygina1
1Institute of the Earth's Crust SB RAS, Irkutsk, Russia
2Irkutsk State University, Irkutsk, Russia
Abstract. In the paper, the feasibility of testing the hypothesis of global heterogeneities in the South Pacific (SOPITA), Africa (AFITA), and Asia (ASITA) based on the noble gas isotopic compositions of volcanic rocks and their deep xenoliths is estimated. To date, systematic studies of noble gases have covered ocean island basalts (OIB) of the first two anomalies, characterized by low seismic velocities at the base of the mantle and low ε182W values, indicating the formation of source material during the separation of the Earth's core in the first 30–60 million years after the CIA event of the Solar System. The formation of a component with high 3He/4He, high 20Ne/22Ne, low 21Ne/22Ne, and low 129Xe/130Xe is associated with the primary differentiation of core–mantle boundary material. Ne isotope ratios are preserved in the OIB sources of the SOPITA and AFITA hotspots, with a decrease in 3He/4He to the value of mid-ocean ridge basalts (MORB). The most ancient protoliths of volcanic rock sources with OIB-like signatures and uranogenic Pb geochrons in the Hadean range of 4.54–4.44 Ga are compared with the time range of primary differentiation of SOPITA and AFITA in ASITA. Olivine phenocrysts from volcanic rocks and volcanic glasses in the Dariganga, Abaga-Dalinuoer, Udokan, Kunlun, Jeju, and South Gobi volcanic fields are promising for obtaining key isotopic indicators of noble gases in the early Earth protoliths in ASITA, equivalent to those of the early Earth SOPITA and AFITA. OIB-like signatures have been determined for these rocks, and Pb isotope ages have been obtained for the protoliths of Hadean mantle sources.
Keywords: 3He/4He, 120Ne/122Ne, 121Ne/122Ne, Asia, latest geodynamic stage
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Rasskazov Sergei Vasilevich,
doctor of geological and mineralogical sciences, professor,
664025, Irkutsk, st. Lenina, 3,
Irkutsk State University, Faculty of Geology,
Head of Dynamic Geology Char,
664033 Irkutsk, st. Lermontova, 128,
Institute of the Earth's Crust SB RAS,
Head of the Laboratory for Isotopic and Geochronological Studies,
tel.: (3952) 51–16–59,
еmail: rassk@crust.irk.ru
Chuvashova Irina Sergeevna,
candidate of geological and mineralogical sciences
664033, Irkutsk, st. Lermontova, 128,
Institute of the Earth's Crust SB RAS,
Senior Researcher,
664025, Irkutsk, st. Lenina, 3,
Irkutsk State University, Faculty of Geology,
Associate Professor of Dynamic Geology Char,
еmail: chuvashova@crust.irk.ru
Yasnygina Tatyana Alexandrovna,
candidate of geological and mineralogical sciences,
664033, Irkutsk, st. Lermontova, 128,
Institute of the Earth's Crust SB RAS,
Senior Researcher,
еmail: ty@crust.irk.ru
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Article received: 10.07.2026; corrected: 13.07.2026; accepted: 17.03.2026.
FOR CITATION: Rasskazov S.V., Chuvashova I.S., Yasnygina T.A. Review of the isotope systematics of noble gases in Global Core-Mantle boundary inhomogeneity in Southern Pacific and Africa: Prospects of the equivalent systematics in Asia // Geology and Environment. 2026. Vol. 6, No. 2. P. 66–115. DOI 10.26516/2541-9641.2026.2.66. EDN: AUSBYE
