MINERALOGICKÁ CHARAKTERISTIKA A DISTRIBUCE ILMENITU A TITANITU V ŽULOVSKÉM MASIVU

Vol.10,(2003)

Zdeněk Losos Magdalena Šimčíková

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Abstract
The Žulová massif is composed of Variscan granitoids. Accessory Ti-phases are represented by ilmenite and titanite in all types of these rocks. Rutile is very rare and arises as product of ilmenite alteration. The highest quantity of ilmenite contain tonalites. Granodiorites and granites contain lower quantities of ilmenite. Macroscopic ilmenites (up to 1 cm) occur in pegmatites and lowtemperature hydrothermal assemblages. Our results show the succession of Ti-minerals in granitic rocks of the ulová massif : 1.magmatic ilmenite (laths or skelets) and titanite (euhedral), 2. younger hypogenic titanite surrounds ilmenite I. with sharp borders, 3. secondary (hypergenic) titanite originated from ilmenite by alteration. Ilmenites contain portions of pyrophanite component (7-13 mol.%), highest amount of MnTiO3 was detected in ilmenite from hydrothermal assemblage from the Černá Voda quarry (18 mol.%). Žulová massif is classified as I-type (Losos et al. 1994, Jedlička 1997), our results (in agreement of Zachovalová et al. 2002 a,b), indicate uncommon ilmenite suite. No magnetite was found in rocks of the Žulová massif. Reduction conditions necessary for crystallization of ilmenite in studied granitic rocks are probably in connection with assimilation of big marble bodies of the surrounding metasediments.

Keywords:
Silesicum; Žulová massif; ilmenite; titanite
References

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