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Przeobrażenia amfiboli w porfirach ryodacytowych z Zalasu koło Krakowa

Marszałek M., Czerny J.

Geologia / Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie

2009

T. 35, z. 2/1

159-166

The study was aimed at alteration of amphibole phenocrysts in the porphyries from Zalas. The alteration processes took place at the magmatic stage: development of orthopyroxenes and biotitization, and at the postmagmatic one: chloritization followed by argillitization and formation of feldspars, carbonate minerals, quartz, ilmenite, magnetite and hematite. Post-magmatic alteration resulted from hydrothermal processes of the metasomatic character.

K-Ar dating of amphiboles from andesite of complex dyke in Dubie (Southern Poland)

Lewandowska A., Banaś M., Zygoń K.

Geochronometria

2007

Vol. 27

11-15

This study presents the results of radiometric K-Ar measurements on separated amphiboles from the andesite of the Dubie complex dyke. The data obtained cover the period of (291.3 ± 6.4) Ma, which corresponds to Carboniferous-Permian transition. The age is contemporaneous to the rhyodacitic and basaltoid volcanism of the Kraków region.