H.O. Kulchytska, MINERALOGICAL AND THERMOBAROMETRIC MELT LIQUATION SINGS IN HYPERSOLVUS SYENITES (UKRAINIAN SHIELD)

https://doi.org/10.15407/mineraljournal.42.01.036

UDC549.02+552.111(477)

MINERALOGICAL AND THERMOBAROMETRIC MELT LIQUATION SINGS IN HYPERSOLVUS SYENITES (UKRAINIAN SHIELD)

H.O. Kulchytska, DrSc (Geology), Chief Research Fellow. https://orcid.org/0000-0002-7206-4797

M.P. Semenenko Institute of Geochemistry, Mineralogy and Ore Formation of the NAS of Ukraine

34, Acad. Palladin Ave., Kyiv, Ukraine, 03142

E-mail: kulchechanna@gmail.com

D.S. Chernysh, PhD (Geology), Head of Department. https://orcid.org/0000-0001-5390-2591

M.P. Semenenko Institute of Geochemistry, Mineralogy and Ore Formation of the NAS of Ukraine

34, Acad. Palladin Ave., Kyiv, Ukraine, 03142

E-mail: chernysh@nas.gov.ua

I.M. Herasymets, PhD (Geology), Junior Research Fellow. https://orcid.org/0000-0003-4670-0216

M.P. Semenenko Institute of Geochemistry, Mineralogy and Ore Formation of the NAS of Ukraine

34, Acad. Palladin Ave., Kyiv, Ukraine, 03142

E-mail: herasimets@i.ua

Language: Ukrainian

Mineralogical journal 2020, 42 (1): 36-48

Abstract: Liquation processes in geology have not been given due attention for a long time. Interest increased after the experiments that have shown the important role of liquation for concentration of rare elements in natural conditions. Based on the collected literature data mainly the results of experiments a number mineralogical and thermobarogeochemical features that indicate on liquation processes in mineral formation environment were systematized. In crystalline rocks signs of liquation are registered very rarely since crystallization usually erases or obscures them. Nevertheless, a number of mineralogical and thermobarometry signs of liquation were found in four hypersolvus syenite massifs on the Ukrainian Shield. These are the Azov, Velyka Vyska, Yastrebetsky and Davydky massifs that are interpreted as layered intrusions with Zr-REE mineralization. The globular and dumbbell-shaped form of minerals and the same form of melt inclusions in crystals, syngenetic melts inclusions with contrasting composition, the meniscus boundary between the mineral phases inside the inclusions, emulsion textures of one mineral in the matrix of another, the case-shaped crystals and other zonal formations with diverse compositions сan indicate on liquation in syenite magma. Each of the identified signs cannot serve as proof of the liquation; however, together they become convincing confirmation of the immiscibility in a magmatic environment. The evidence about repeated separation was obtained for syenite magma of hypersolvus syenite, first on the femic and salic melts. The salic melt subsequently separated into silicate and salt components. In two cases, it was possible to fix evidences of the salt melt separation into fluoride and carbonate components. It is assumed that the liquation signs were preserved in hypersolvous syenites due to the fact that at the beginning of crystallization there was a supercooling of the magmatic melt or a decrease in fluid pressure and an increase in the melt viscosity which led to the hardening of the liquation texture. Especially such hardening took place in Velyka Vyska small bodies. It was noted that the genetic interpretation of many mineralogical data can differ significantly when considering the probability of liquatiuon processes in a magmatic source.

Keywords: stratification, immiscibility, liquation, globule, Zr-REE mineralization, salt melt.

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