A. I. Usoltseva

Lomonosov Moscow State University

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ОА

О. А. Андреева

Russian Academy of Sciences

ЕV

Е. V. Коvalchuk

Institute of Geology of Ore Deposits Petrography Mineralogy and Geochemistry

V. V. Yarmolyuk

Institute of Geology of Ore Deposits Petrography Mineralogy and Geochemistry

J.-Q. Ji

Peking University

I. A. Andreeva

Institute of Geology of Ore Deposits Petrography Mineralogy and Geochemistry

Xin Zhou

Peking University

АА

А. А. Аверин

Frumkin Institute of Physical Chemistry and Electrochemistry

Cooperative Institutions

Russian Academy of Sciences

Institute of Geology of Ore Deposits Petrography Mineralogy and Geochemistry

Peking University

Crimean Astrophysical Observatory

P.L. Kapitza Institute for Physical Problems

Special Astrophysical Observatory

Kurgan State Agricultural Academy by T S Maltsev

Institute of Macromolecular Compounds

Lomonosov Moscow State University

Moscow State University

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Formation of Trachytes from Wangtian’e Volcanic Neck of the Changbaishan Area (Northeast China) as a Result of Tholeiitic Magma Crystal Fractionation

Doklady Earth Sciences (2023)

О. А. Андреева I. A. Andreeva A. I. Usoltseva V. V. Yarmolyuk Е. V. Коvalchuk

Abstract Tholeiitic basalts and trachytes of the bimodal association of Wangtian’e volcano are studied. It is shown that trachytes formed with the leading role of crystal fractionation of the parental tholeiitic magma. It has been identified from the melt inclusion study that hedenbergite and plagioclase phenocrysts of trachytes from Wangtian'e volcanic neck crystallized in the temperature range of 1080–1100 and 1050–1060°C, respectively. After heating experiments with melt inclusions in plagioclase of trachytes, in some cases relics of carbonates and CO 2 were observed in the inclusions. The trachyte phenocrysts host water-bearing Fe-rich globules and CO 2 inclusions with carbonate phases. The Fe-rich silicate globules are often intergrown with titanomagnetite and are covered by amorphous carbon films. A model is suggested explaining the formation of water-bearing Fe-rich globules and CO 2 inclusions with carbonate relics as a result of silicate–silicate and silicate–carbonate liquid immiscibility, that was caused by the evolution of the parental basaltic melt. Upon the trachytic melt ascending to the surface, the ferrocarbonate liquid was decomposed on magnetite, carbon, and carbon dioxide.

Phenocryst

Trachyte

Melt inclusions

Magma chamber

10.1134/s1028334x23602201

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FORMATION OF TRACHYTES FROM WANGTIAN’E VOLCANIC NECK OF THE CHANGBAISHAN AREA (NORTHEAST CHINA) AS A RESULT OF THOLEIITIC MAGMA CRYSTAL FRACTIONATION

Доклады РОССИЙСКОЙ АКАДЕМИИ НАУК Науки о Земле (2023)

О. А. Андреева I. A. Andreeva A. I. Usoltseva V. V. Yarmolyuk Е. V. Коvalchuk

Tholeiitic basalts and trachytes of Wangtian’e bimodal association are studied. It is shown that trachytes were formed under the leading role of crystal fractionation of the initial tholeiitic magma. Based on the method of melt and fluid inclusion studies, it was determined that hedenbergite phenocrysts from Wangtian’e volcanic neck crystallized in the temperature range of 1080–1100°С, and plagioclase phenocrysts crystallized at temperatures of 1050–1060°С. After thermometric experiments with melt inclusions in plagioclase from trachytes, in some cases relics of carbonates and carbon dioxide were observed in the inclusions. Trachyte phenocrysts contain hydrous Fe-rich silicate globules and CO2 inclusions containing carbonate phases. Fe-rich silicate globules are often intergrown with titanomagnetite and covered with films of amorphous carbon. A model the appearance of hydrous Fe-rich globules and CO2 inclusions with carbonate relics is proposed. It results due to the silicate-silicate and silicate-carbonate liquid immiscibility processes, that are caused by the evolution of the initial basaltic melt. As the trachyte melt has been risen to the surface, the ferrocarbonate liquid decomposed into magnetite, carbon, and carbon dioxide.

Phenocryst

Trachyte

Melt inclusions

Magma chamber

10.31857/s2686739723601850

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Erratum to: Formation of Trachytes from Wangtian’e Volcanic Neck of the Changbaishan Area (Northeast China) as a Result of Tholeiitic Magma Crystal Fractionation

Doklady Earth Sciences (2023)

О. А. Андреева I. A. Andreeva A. I. Usoltseva V. V. Yarmolyuk Е. V. Коvalchuk

An Erratum to this paper has been published: https://doi.org/10.1134/S1028334X23060089

Magma chamber

Igneous differentiation

10.1134/s1028334x23060089

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