Experimental modeling of the interaction of fluorine-containing granite melt and calcite marble

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Abstract

At 750°C and a pressure of 1 kbar, an experiment was carried out simulating the contact-reaction interaction of calcite and a deeply differentiated fluorine-containing granite melt. The water content in the system did not exceed 10% of the dry charge mass. The possibility of interaction of magmatic melt with calcite is shown. The experimental products contain a zoned column composed of liquid phases along with crystalline minerals. In the apocarbonate part, the newly formed phases are represented by cuspidine, quartz, wollastonite, grossular and the non-crystalline carbonate-fluoride phase LCF. Phase parageneses in the zones of the apocarbonate part of the column vary depending on the ratio of CO2 and HF activities. In the silicate part, aluminosilicate glass, alkali feldspar, and plagioclase of variable composition were found. Silicon and fluorine are intensively transferred from the silicate to the carbonate part, and calcium in a small amount is transferred in the opposite direction.

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About the authors

Iana O. Alferova

Lomonosov Moscow State University

Email: YanaAlf@bk.ru

Faculty of Geology

Russian Federation, Moscow

Anna S. Novikova

Institute of Experimental Mineralogy, Russian Academy of Sciences

Email: novikova-a-s@yandex.ru
Russian Federation, Chernogolovka, Moscow region

Evgeniy N. Gramenitskiy

Institute of Experimental Mineralogy, Russian Academy of Sciences

Author for correspondence.
Email: YanaAlf@bk.ru
Russian Federation, Chernogolovka, Moscow region

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Supplementary files

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2. Fig. 1. The apocarbonate (left) and silicate (right) parts of the sample. The general view and boundaries of the zones. Cal – calcite, Cls – celsian, Csp – cuspidine, Flu – fluorite, Grt – garnet of grossular composition, Kfs – alkaline feldspar, L – aluminosilicate glass, LCF – carbonate-fluoride phase, Pl – plagioclase, Qz – quartz, Wo – wollastonite.

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3. Fig. 2. Boundary of zones 1 and 2: general view (a) and details of the structure of the first zone (b, c, d). The boundary is drawn by the appearance of wollastonite. Due to it, the second zone in the drawing looks lighter.

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4. Fig. 3. Mineral composition and structure: (a) zone 2; (b) zone 3; (c) zone 4; (d) contact area (zones 4, 5, 6, 7); ( e) zone 7; (e) fluorite-cuspidine-wollastonite aggregate in the zone 7. The boundary between zones 4 and 5 is defined by the appearance of wollastonite and the disappearance of the LCF phase. Zone 6 consists of plagioclase. Zone 7 is made of aluminosilicate glass and alkali feldspar.

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5. Fig. 4. Compositions of feldspars from zones 6 and 7.

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6. Fig. 5. The content of components in the sample at different distances from the contact. Plagioclase from zone 6 was taken as zero. Positive values along the abscissa axis correspond to the silicate part of the sample, negative values correspond to the carbonate part.

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7. Fig. 6. Diagram lgaCO2–lgaHF, which demonstrates the relative location of the fields of stability of mineral phases and their reaction lines depending on the activity of CO2 and HF in the CaO-SiO2 system. When moving to quantification, the size of the fields may change. The composition of the LCF phase was set on the assumption that the entire excess of negative charges is compensated by carbon.

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