MINERALS OF RARE ELEMENTS IN JUVITES OF THE POKROVO-KYRIYIVO MASSIF (АZOV SEA AREA, UKRAINE)

https://doi.org/10.15407/mineraljournal.40.02.003

UDC 549.552.33 (477)

V.V. Sharygin (1,2), S.G. Kryvdik (3)
(1) Sobolev Institute of Geology and Mineralogy, Siberian Branch of the RAS
3, Acad. Koptyuga Ave., Novosibirsk, Russia, 630090
(2) Novosibirsk State University
1, Pirogova Str., Novosibirsk, Russia, 630090
E-mail: sharygin@igm.nsc.ru
(3) M.P. Semenenko Institute Geochemistry, Mineralogy and Ore Formation of the NAS of Ukraine
34, Acad. Palladin Ave., Kyiv, Ukraine, 03142
E-mail: kryvdik@ukr.net
Language: Ukrainian
Mineralogical journal 2018, 40 (2): 3-16

MINERALS OF RARE ELEMENTS IN JUVITES OF THE POKROVO-KYRIYIVO MASSIF (АZOV SEA AREA, UKRAINE)

Abstract: Accessory minerals have been studied in detail in juvites of the Pokrovo-Kyriyivo Massif (Аzov Sea area, Ukraine). The chemical composition was outlined for trace element (Sr, REE, Zr, Nb) minerals such as burbankite, strontianite, bastnesite-(La), bastnaesite-(Ce), hilairite, cerite-(La), Sr-rich fluorapatite (9-16 wt. % SrO), Nb-rich pyrophanite (up to 9.6 wt. % Nb2O5) and other phases with high Nb and REE content (titanite, goetzenite). Exsolution in the solid state and/or mosaic zonality occasionally occur in Sr-fluorapatite and pyrophanite. Chemical inhomogeneity (mosaicism or exsolution) is clearly fixed in Sr-rich fluorapatite by the SrO content: 9-10 and near 16 wt. %. Pyrophanite contains exsolution hematite. Some differences in composition of same accessory minerals are revealed for juvites and related malignites of the Pokrovo-Kyriyivo Massif. In REE-containing minerals from juvites (burbankite, ancylite, bastnaesite, fluorapatite, cerite) La more often predominates over Ce, whereas the same minerals from malignites show a reverse pattern. Burbankite from juvites and malignites has high content of Sr and Na, and low Ba, but burbankite in juvites is less enriched in REE. There are two varieties of strontianite in the CaO concentration: up to 11 wt. % and up to 2.7 wt. %. The first variety forms large individual crystals, commonly with inclusions of burbankite), and the second type occurs as small inclusions in large burbankite grains. In general, the accessory mineralization in juvites and malignites of the Pokrovo-Kyriyivo Massif is quite similar to that in the agpaitic feldspathoid syenites of the large alkaline complexes around the world.

Keywords: Pokrovo-Kyriyivo Massif, accessory minerals of rare elements, burbankite, strontianite, bastnaesite, cerite-(La), Sr-fluorapatite, hilairite, Nb-pyrophanite.

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