Potassium metasomatism in the neighbourhood of Mátraszentistván (W-Mátra mountains)
In the W-Mátra Mountains, S from Mátraszentistván the Lower-Tortonian andesite series underwent potassium metasomatism to a considerable extent. Theplagioclase feldspar of the sometimes compact, sometimes porous but owing to the marked silicification always resistant rock has been replaced by sanidi...
Elmentve itt :
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| Dokumentumtípus: | Cikk |
| Megjelent: |
University of Szeged, Department of Mineralogy, Geochemistry and Petrology
Szeged
1968
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| Sorozat: | Acta mineralogica-petrographica
18 No. 2 |
| Kulcsszavak: | Kőzettan, Ásványtan, Földtan |
| Tárgyszavak: | |
| Online Access: | http://acta.bibl.u-szeged.hu/24495 |
| Tartalmi kivonat: | In the W-Mátra Mountains, S from Mátraszentistván the Lower-Tortonian andesite series underwent potassium metasomatism to a considerable extent. Theplagioclase feldspar of the sometimes compact, sometimes porous but owing to the marked silicification always resistant rock has been replaced by sanidine, easily identified by X-ray investigations. In the course of metasomatism the extent o f silicification is so marked that in certain places instead of feldspar even quartz varieties are to be found. The cavities are covered by quartz and chalcedony, rarely by tridymite. On the N parts of Mátra peaks the medial dacite tuff, appearing on the HelvetianTortonian boundary, is missing, here probably the andesite series is also settled immediately upon the Helvetian marly aleurite, thus likely the Burdigalian acidic detrital vulcanic substance may serve as a potassium source for the endometamagmatic potassium metasomatism. |
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| Terjedelem/Fizikai jellemzők: | 99-107 |
| ISSN: | 0365-8066 |