Abstract—
Oxygen isotope composition was studied in 33 monomineralic fractions of olivine from plagioclase lherzolite, dunite, troctolite, and olivine gabbronorite of the Yoko-Dovyren layered massif. The δ18O values of the least altered rocks not contaminated with crustal materials range within 5.8 ± 0.2‰ (n = 27). These values for the dunite contaminated with carbonate material are notably higher and average at 6.2 ± 0.3‰. This is similar to characteristics of the Bushveld and Jinchuan mineralized complexes. Using the COMAGMAT-5 model, the temperatures of equilibrium of 98% crystals with late portions of the residual melts were evaluated at 1131–1266°C (1176 ± 34°C on average). These estimates are viewed as the closing temperatures of the cumulate systems with respect to the efficient exchange of 18O and 16O isotopes between olivine and mobile melt/fluid. For the uncontaminated systems, the δ18O values of the parental melt calculated using the modeled temperatures are 6.6 ± 0.2‰, and are 7.1 ± 0.3 ‰ for melts with signatures of crustal contamination. Such relations are consistent with insignificant (no more than a few percent) contamination of the parental magmas with carbonate materials from the host rocks.
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Notes
The LOI values were corrected by the formula (Lechler and Desilets, 1987) LOI* = LOI (original) + 0.11FeO, where the original value corresponds to the analytical values, and FeO is the total Fe concentration in the rock. It is therewith assumed that the oxidized Fe fraction in cumulates (particularly in an adcumulus rock) is low, and Fe2+ is completely oxidized in the process of annealing.
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ACKNOWLEDGMENTS
The authors thank V.B. Polyakov (Institute of Experimental Mineralogy, Russian Academy of Sciences) for valuable comments on the manuscript and O.A. Lukanin (Vernadsky Institute of Geochemistry and Analytical Chemistry, Russian Academy of Sciences).
Funding
This study was supported by the Russian Science Foundation, project no. 16-17-10129. The oxygen isotope composition of olivine was studied under government-financed research project 0136-2019-0013 for the Institute of Geology of Ore Deposits, Petrography, Mineralogy and Geochemistry (IGEM), Russian Academy of Sciences. Olivine samples for this research were prepared under government-financed research project for the Vernadsky Institute of Geochemistry and Analytical Chemistry (GEOKhI), Russian Academy of Sciences.
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Ariskin, A.A., Fomin, I.S., Dubinina, E.O. et al. Oxygen Isotope Composition in Olivine and Melts from Cumulates of the Yoko-Dovyren Layered Massif, Northern Transbaikalia, Russia. Geochem. Int. 59, 156–170 (2021). https://doi.org/10.1134/S0016702921020026
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DOI: https://doi.org/10.1134/S0016702921020026