| Autor: |
Кривдік, С. Г., Цимбал, О. Ю. |
| Předmět: |
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| Zdroj: |
Mineralogicheskiya Zhurnal; 2024, Vol. 46 Issue 2, p67-73, 7p |
| Abstrakt: |
Ferry-kaersutite as a rare mineral have been found in North-Western part of the Ukrainian Shield where alkalineultrabasic 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 ferrykaersutites 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. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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