Chemická variabilita granitu typu Černá kočka čisteckého masivu

Pages 42-46
Bulletin mineralogicko-petrologického oddělení Národního muzea v Praze | 2011/19/1

The Černá kočka muscovite alkali feldspar granite, occurring on the SE border of the Čistá granitoide massif, has been hitherto chemically characterized by a single analysis only. The present contribution, using 46 new unpublished chemical analyses from a technological report, offers in a series of diagrams a comprehensive petrochemical characteristic of this rather exceptional. rock and compares it with the previous published analysis. The Černá kočka granite differs markedly from the main granitoid types of the Čistá-Jesenice Pluton (the Tis granite, Petrohrad granodiorite, Čistá central and Čistá peripheral granodiorite) by its specific geochemistry (namely high-K character, higher SiO2 and alkalis and extremely low TiO2, Fe2O3 tot , MgO and CaO contents), by its mineralogy (especially by the absence of biotite and the presence of albite and ± tourmaline) and by its autonomous geological setting and by the supposed younger age of the emplacement.

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