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

O. A. Andreeva; Андреева О. А.; I. A. Andreeva; Андреева И. А.; A. I. Usoltseva; Усольцева А. И.; V. V. Yarmolyuk; Ярмолюк В. В.; E. V. Kovalchuk; Ковальчук Е. В.; A. A. Averin; Аверин А. А.; J.-Q. Ji; Ji J.-Q.; X. Zhou; Zhou X.

doi:10.31857/S2686739723601850

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

Authors: Andreeva O.A.¹, Andreeva I.A.¹, Usoltseva A.I.², Yarmolyuk V.V.¹, Kovalchuk E.V.¹, Averin A.A.³, Ji J.⁴, Zhou X.⁴
Affiliations:
1. Institute of Geology of Ore Deposits, Petrography, Mineralogy and Geochemistry Russian Academy of Sciences
2. Lomonosov Moscow State University
3. Frumkin Institute Of Physical Chemistry And Electrochemistry RAS
4. School of Earth and Space Sciences Peking University
Issue: Vol 513, No 2 (2023)
Pages: 196-205
Section: PETROLOGY
Submitted: 30.12.2023
Published: 01.12.2023
URL: https://bakhtiniada.ru/2686-7397/article/view/247158
DOI: https://doi.org/10.31857/S2686739723601850
EDN: https://elibrary.ru/XOLAKF
ID: 247158

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Abstract

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.

Keywords

Cenozoic volcanism, bimodal magmatism, trachytes, crystal fractionation, silicate-silicate liquid immiscibility, silicate-carbonate liquid immiscibility, melt inclusions, fluid inclusions

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