Origin of the oxygen isotope heterogeneity for alkaline and subalkaline basalts in the Northern Minusa depression, Southern Siberia | Geosphere Research. 2022. № 4. DOI: 10.17223/25421379/25/2

Origin of the oxygen isotope heterogeneity for alkaline and subalkaline basalts in the Northern Minusa depression, Southern Siberia

In the Minusa trough of the Altai-Sayan paleorift area, basalt magmatism of different ages is manifested. In the northern part of the trough (the Northern Minusa Depression), Early Devonian subalkaline basalts predominate among its products, small intrusions of Permian-Triassic dolerites and diatremes of Late Cretaceous basanites are less common. The oxygen isotopic composition in whole-rock basaltoids was studied by the laser ablation method with preliminary laser-fluorination. The 3¹⁸O_V-SMOW ratio variations from +5.4 to +7.6 % in basanites and dolerites are partially comparable with the MORB parameters and do not go beyond the range of intraplate oceanic and continental basalts. Apparently, this indicates the mantle origin of the primary melt and the presence of a sublithospheric plume substance in it. The values of 3¹⁸O > +6 %o in mafic rocks (up to © Врублевский В.В., Котельников А.Д., Казенова Ф., Кремер И.О., Тишин П.А., 2022 + 8.8 % in subalkaline basalts) may indicate crustal contamination of magma, but in most samples the equilibrium with "normal-magmatic" water is maintained. For some dolerites with a value of #Mg < 45, an isotopic inversion with 3¹⁸O from -0.7 to +4 % is recorded, due to the probable participation of meteoric waters in a low-temperature hydrothermal fluid. According to the totality of data on isotopic composition and distribution of HFS elements in rocks, we assume that, unlike basalt eruptions in the Early Devonian, dolerite and especially basanite melts are derivatives of deeper and enriched reservoirs. Heterogeneity of magmatic sources was associated with the processes of plume-lithospheric interaction and decompression melting of the modified upper mantle.

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Keywords

subalkaline basalt, dolerite, basanite, oxygen isotopes, mantle, contamination, Minusa trough

Authors

Name	Organization	E-mail
Vrublevskii Vassily V.	National Research Tomsk State University	vasvr@yandex.ru
Kotelnikov Alexey D.	National Research Tomsk State University	geokart@ggf.tsu.ru
Kazenova Feride	National Research Tomsk State University	feride.kazenova@mail.ru
Kremer Ivan O.	National Research Tomsk State University	kremer.ivan.1992@mail.ru
Tishin Platon A.	National Research Tomsk State University	tishin_pa@mail.ru

Всего: 5

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