Ján SPIŠIAK¹, Anna VOZÁROVÁ², Jozef VOZÁR³, Štefan FERENC¹, Tomáš MIKUŠ³ & Viera ŠIMONOVÁ^1
1Faculty of Natural Sciences, Matej Bel University, Tajovského 40, 974 01 Banská Bystrica, Slovakia; jan.spisiak@umb.sk
²Faculty of Natural Sciences, Comenius University, Ilkovičova 6, 842 15 Bratislava, Slovakia; vozarova@fns.uniba.sk
³Earth Science Institute, Slovak Academy of Sciences, Dúbravská cesta 9, P.O Box 106, 840 05 Bratislava, Slovakia; jozef.vozar@savba.sk

Fe³⁺ - RICH KATOITE FROM PERMIAN BASALTS (HRONICUM, WESTERN CARPATHIANS, SLOVAKIA): COMPOSITION AND ORIGIN

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The study of Permian basalts (rift-related continental tholeiites) from the Nízke Tatry Mts., Hronicum Superunit, Western Carpathians (Slovakia) has shown the presence of an assemblage containing hydrated andradite-grossular garnet. The primary minerals of basalts in this assemblage are plagioclase, clinopyroxene, magnesio-hornblende, biotite and fine-grained matrix. This association is partly altered and hydrated garnets together with chlorites formed by replacement of primary clinopyroxenes. Other secondary minerals are albite, actinolite and rarely pumpellyite-prehnite. The hydrated garnet is characteristic for high contents of Ca, Fe and Al, increased contents of Ti and very low contents of Mn, and Mg. The presence of OH in the garnet was confirmed in Raman spectroscopy. According to the new nomenclature of garnets (IMA), this garnet corresponds to kenogarnet (katoite).