Abstract
The role and conditions of liquid immiscibility or crystallization of sulfide phase during evolution of subduction-related magmas remains a debated topic, which bears relevance to the genesis of porphyry copper deposits and evolution of the continental crust. We studied rare volcanic rocks with inclusions of magmatic sulfides in olivine—the basalts of Medvezhya Mount in the Avachinsky group of volcanoes. The rocks belong to primitive (Mg# = 66 mol %) middle-K island-arc olivine basalts. Olivine with normal zoning predominates (~98%) among phenocrysts. The olivine compositions are typical for Kamchatka basalts, except for an unusual trend of increase of MnO content from 0.20 to 0.55 wt % and decrease of Fe/Mn from 60 to 35 with a change of olivine composition from Fo87.8 to Fo78.2. Olivine of this group contains numerous inclusions of spinel-group minerals varying in composition from chromium spinel to magnesian magnetite. Olivine phenocrysts with sulfide inclusions are characterized by the absence of or weak reverse zoning and reduced contents of Ca, Ni, Mn, Cr, and Al. The estimated crystallization temperatures are 1036–1241°C for olivine of the prevailing type and 1010–1062°C for sulfide-bearing olivine. The data suggest that crystallization of the main olivine population occurred under relatively shallow conditions and was accompanied by strong magma oxidation. On the contrary, the zoning pattern and compositional features of sulfide-bearing olivine suggest its xenogenic origin and the probable crystallization under deep-crustal conditions from low-temperature water-rich and/or low-Ca magmas. The results obtained confirm the possibility of saturation of oxidized island-arc magmas with sulfide phase at lower crustal conditions, but show that this process is rare and not typical for low-pressure crystallization stage.
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Notes
Supplementary materials to the Russian and English on-line versions can be found on sites https://elibrary.ru/ and http://link.springer.com/, respectively, and include: ESM_1.xlsx—Composition of studied samples; ESM_2.xlsx—High-precision WDS-analysis of olivine from the studied samples (Moscow State University); ESM_3.xlsx—WDS measurement of secondary olivine standard; ESM_4.xlsx—High-precision WDS-analysis of olivine from the studied samples; ESM_5.xlsx—Composition of spinel inclusions in olivine and high-precision WDS-analysis of host olivine; ESM_6.xlsx—WDS-analysis of spinel phenocrysts from the studied samples; ESM_7.xlsx—SEM analysis of sulfide inclusions in olivine; ESM_8.xlsx—WDS-analysis of clinopyroxenes; ESM_9.xlsx—WDS-analysis of plagioclase; ESM_10.xlsx—WDS-analysis of groundmass ore minerals.
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ACKNOWLEDGMENTS
We are grateful to N.A. Nekrylov for his valuable advices and help with the paper. A.A. Ariskin and M.L. Tolstykh are thanked for detailed reviewing, which helped us to revise obtained results.
Funding
This work was supported by the Russian Science Foundation no. 22-27-00029 and was made in the framework of the government-financed program no. 0282-2019-0004 of the Institute of Volcanology and Seismology FEB RAS.
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Savelyev, D.P., Gorbach, N.V., Portnyagin, M.V. et al. The Origin of Olivine Basalts from Medvezhya Mount (Avachinsky Group of Volcanoes, Kamchatka): The Evidence for Assimilation of Sulfide-Bearing Cumulates. Petrology 31, 263–278 (2023). https://doi.org/10.1134/S0869591123030074
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DOI: https://doi.org/10.1134/S0869591123030074