S.G. Kryvdik, AMPHIBOLE OF KAERSUTITE SERIES FROM ALKALINE ROCKS IN NORTH-WESTERN PART OF THE UKRAINIAN SHIELD
https://doi.org/10.15407/mineraljournal.46.02.067
UDC 549.643.(477)
AMPHIBOLE OF KAERSUTITE SERIES FROM ALKALINE ROCKS
IN NORTH-WESTERN PART OF THE UKRAINIAN SHIELD
S.G. Kryvdik, DrSc (Geology, Mineralogy), Prof.
E-mail: kryvdik@ukr.net; orcid: 0000-0002-8356-1115
O.Yu. Tsymbal, PhD student
E-mail: tsymlbaloleksandra1@gmail.com; orcid: 0000-0002-8800-9899
M.P. Semenenko Institute of Geochemistry, Mineralogy and Ore Formation of the NAS of Ukraine
34, Acad. Palladin Ave., Kyiv, Ukraine, 03142
Language: Ukrainian
Mineralogical journal 2024, 46 (2): 67-73
Abstract: Ferry-kaersutite as a rare mineral have been found in North-Western part of the Ukrainian Shield where alkaline-ultrabasic rocks of jacupirangite-melteigite series are widespread. Ferry-kaersutite occurs in essexite that form thin veins and apophyses from dikes of porphyry-like alkaline-ultrabasic rocks. By results of microprobe analyses ferry-kaersutites are of such composition (%): 39—40 SiO2; 4.6—5.07 TiO2; 14.6—14.9 Al2O3; 16.9—18.4 FeOtot; 7.95—8.09 MgO; 10.5—11.0 CaO; 2.4—2.9 Na2O; 2.7—2.9 K2O. In alkaline-ultrabasic rocks of this region different more magnesian amphiboles (pargasites, richterites, magnesio-riebeckite, katophorite and other intermediate varieties) are present. Some of these amphiboles are enriched in TiO2 (to 2.9—3.2%). It is assumed that studied ferry-kaersutite has formed at quick crystallization and partly contamination of alkaline-ultrabasic melts in veins and apophyses among country granitoids.
Keywords: ferry-kaersutite, alkaline-ultrabasic rocks, essexites.
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