Silicate Liquid Immiscibility as a Result of Fenner-Type Crystal Fractionation of Wangtian’e Tholeiitic Melts, Northeast China

Andreeva, O. A.; Andreeva, I. A.; Yarmolyuk, V. V.; Ji, Jianqing; Zhou, Xiwen; Borisovskii, S. E.

doi:10.1134/s0869591120040025

Cited by 6 publications

(13 citation statements)

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“…This higher content in transition metal oxides is likely to be responsible for the stronger tendency of Mt. Etna trachybasalt toward nanocrystallization: although these components can be assumed to be homogeneously distributed in the stable melt, their solubility in the undercooled liquid is strongly temperaturedependent and is additionally affected by changes in oxygen fugacity [156][157][158][159][160][161][162] . A sufficiently long dwell at medium-to-deep undercooling can therefore induce nucleation and growth of Fe-Ti-oxide crystals simply due to their melt oversaturation, which will ultimately be more pronounced in a FeO-and TiO 2 -richer melt.…”

Section: Resultsmentioning

confidence: 99%

A chemical threshold controls nanocrystallization and degassing behaviour in basalt magmas

Scarani

Zandonà

Fiore

et al. 2022

Commun Earth Environ

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An increasing number of studies are being presented demonstrating that volcanic glasses can be heterogeneous at the nanoscale. These nano-heterogeneities can develop both during viscosity measurements in the laboratory and during magma eruptions. Our multifaceted study identifies here total transition metal oxide content as a crucial compositional factor governing the tendency of basalt melts and glasses towards nanolitization: at both anhydrous and hydrous conditions, an undercooled trachybasalt melt from Mt. Etna readily develops nanocrystals whose formation also hampers viscosity measurements, while a similar but FeO- and TiO2-poorer basalt melt from Stromboli proves far more stable at similar conditions. We therefore outline a procedure to reliably derive pure liquid viscosity without the effect of nanocrystals, additionally discussing how subtle compositional differences may contribute to the different eruptive styles of Mt. Etna and Stromboli.

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Section: Resultsmentioning

confidence: 99%

A chemical threshold controls nanocrystallization and degassing behaviour in basalt magmas

Scarani

Zandonà

Fiore

et al. 2022

Commun Earth Environ

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“…The basalt (sample B-19) from the upper part of the section of the shield volcano contains some isolated resorbed subphenocrysts of olivine (Fo = 74), which represent xenogenic phases out of equilibrium with the basaltic magma. It has been shown (Andreeva et al, 2020) that plagioclase is the first liquidus phase in the studied basalts. The groundmass minerals are represented by plagioclase, olivine (Fo = 43.2-56.4), titanaugite (#Mg = 0.64-0.70), ilmenite, titanomagnetite, fluorapatite and ferrocarbonate.…”

Section: Geochemical Characteristics Of Tholeiitic Basaltsmentioning

confidence: 89%

“…The Changbaishan volcanic field (Figure 1) is spatially constrained to the northern margin of the Archean-Proterozoic Sino-Korean craton at the Chinese-North Korean border, at the intersection of the northeast-trending Tanlu rift system and the northwest-trending Paektusan faults (Andreeva et al, 2014;Andreeva et al, 2020). Two large stratovolcanoes are located within this volcanic field: Changbaishan and Wangtian'e.…”

Section: Introductionmentioning

confidence: 99%

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Mechanism of carbonate assimilation by intraplate basaltic magma and liquid immiscibility: example of Wangtian’e volcano (Changbaishan volcanic area, NE China)

Andreeva,

Dubinina,

Andreeva

et al. 2023

Front. Earth Sci.

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The balance of CO2 during abundant basaltic magma production is an important factor of volcanic hazards and climate. In particular, this can be explored based on CO2-rich mantle-derived magmas or carbonate assimilation by basaltic melts. To reconstruct the origin of Fe-rich carbonates hosted by Cenozoic basalts from Wangtian’e volcano (northeast China), we studied elemental compositions of melt, crystalline and fluid inclusions in magmatic minerals as well as the oxygen and carbon isotope compositions of the plagioclase and carbonates from basalts. The crystallization of basaltic magmas occurred in shallow chamber (∼4 km) at temperatures of 1,180°C–1,200°C and a pressure of 0.1 ± 0.01 GPa. Stable Fe-rich carbonates occur in the Wangtian’e tholeiite basalts as groundmass minerals, crystalline inclusions in plagioclase and globules in melt inclusions, which suggests that they crystallized from a ferrocarbonate melt. The values of δ18О and δ13С in the minerals analyzed by laser fluorination method are in line with the sedimentary source of Fe-rich carbonates, indicating assimilation and partial decomposition of carbonate phases. The parent ferrocarbonate melt could be produced during interactions between the basaltic magma and the crustal marbles. The phase diagram and thermodynamic calculations show that the ferrocarbonate melt is stable at a temperature of 1,200°C and a pressure of 0.1 GPa. Our thermodynamic calculations show that carbonate melt containing 73 wt% FeCO3, 24 wt% MgCO3 and 3 wt% CaCO3 is in thermodynamic equilibrium with silicate melt in agreement with our natural observations. The proposed mechanism is crustal carbonate sediment assimilation by the intraplate basaltic magma resulting in the melt immiscibility, production of the ferrocarbonate melt and the following Fe-rich carbonate mineral crystallization during magma residence and cooling.

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“…Two accepted origins for these granophyres are based on opensystem magmatic processes, either combining crystal fractionation and variable crustal assimilation [14] or by partial melting of the crust induced by the high thermal energy of gabbroic intrusions [13]. Nevertheless, the formation of granophyres in tholeiitic magmas linked to a closed-system magmatic evolution involving extreme crystal fractionation (e.g., [16]) or melt immiscibility has also been proposed in tholeiitic bodies (e.g., [15,17,18]).…”

Section: Introductionmentioning

confidence: 99%

Petrology and Geochemistry of Highly Differentiated Tholeiitic Magmas: Granophyres in the Messejana–Plasencia Great Dyke (Central Iberia)

Orejana,

Villaseca,

Losantos

et al. 2024

Minerals

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The Messejana–Plasencia great dyke (MPGD) is a Late Triassic tholeiitic gabbro intrusion related to the Central Atlantic Magmatic Province. Its large outcrop extent (~530 km), combined with its prolongation below the Duero basin (additional 100 km), makes it one of the world’s largest dykes known. We have studied felsic granophyric bodies appearing in its northernmost segment at different scales, from mm-sized (interstitial micrographic pockets) to felsic dykes of up to 10 m thick and 1.5 km long, intruding within the gabbros. Significant differences exist in the mineral and whole-rock composition of gabbros and granophyres, including the Sr–Nd isotopic ratios. The chemical variation in the gabbros is coherent with fractionation of olivine, clinopyroxene and plagioclase at depth. However, the presence of a compositional gap between gabbros and granophyres (absence of intermediate compositions) and the formation of these late-stage intergranular felsic melts within the gabbro mesostasis suggest that they could be derived by liquid immiscibility. The Sr–Nd isotopic heterogeneity in the MPGD gabbros and the presence of zircons with Variscan ages (~286 Ma), inherited from granulitic rocks, indicate that the mafic magmas experienced some degree of lower crust assimilation during fractionation close to the Moho depth. On the contrary, the scarce xenocrystic Variscan zircon crystals found in a granophyric dyke within the MPGD gabbro display similar textures and ages (~299 Ma) to those of the country rock granites and point to contamination at a different crustal level.

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Silicate Liquid Immiscibility as a Result of Fenner-Type Crystal Fractionation of Wangtian’e Tholeiitic Melts, Northeast China

Cited by 6 publications

References 50 publications

A chemical threshold controls nanocrystallization and degassing behaviour in basalt magmas

A chemical threshold controls nanocrystallization and degassing behaviour in basalt magmas

Mechanism of carbonate assimilation by intraplate basaltic magma and liquid immiscibility: example of Wangtian’e volcano (Changbaishan volcanic area, NE China)

Petrology and Geochemistry of Highly Differentiated Tholeiitic Magmas: Granophyres in the Messejana–Plasencia Great Dyke (Central Iberia)

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