Petrographical study of subvolcanic rocks surrounding of Mórágy and Ófalu (SE-Transdanube, Hungary)

Rock types described as bostonites by MAURJTZ and CSAIÁGHY (1952), JANTSKY (1972) are characterized in this paper. They can be subdivided into two groups: (I) Light-reddish, brownish-coloured, fine-grained rock characterized by trachytic texture with potassium feldspar microlites in the groundmass s...

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Bibliographic Details
Main Author: Szabados Cs
Format: Article
Published: University of Szeged, Department of Mineralogy, Geochemistry and Petrology Szeged 1995
Series:Acta mineralogica-petrographica 36
Kulcsszavak:Kőzettan, Ásványtan, Földtan
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Online Access:http://acta.bibl.u-szeged.hu/24828
Description
Summary:Rock types described as bostonites by MAURJTZ and CSAIÁGHY (1952), JANTSKY (1972) are characterized in this paper. They can be subdivided into two groups: (I) Light-reddish, brownish-coloured, fine-grained rock characterized by trachytic texture with potassium feldspar microlites in the groundmass showing a subparallel arrangement among K-feldspar phenochrysts forming by flow parallely with the wall-rock. This type occurs only in dykes which penetrate the granite mass. On the basis of petrographical examinations this group is classified as alkalitrachyte. (2) Greenish, greyish-coloured, fine-grained rock characterized by a microholocrystalline. porphyritic texture. It forms a small laccolith-like subvolcanic body in the quarry of Kismórágy No. 5. and like a centre, dykes run from here to every directions. On the basis of petrographical examinations this group is classified as trachyandesite (or latite).
Physical Description:129-142
ISSN:0365-8066