Tectonic and magmatic effects on amphibole chemistry in mylonitized amphibolites and amphibole-bearing enclaves associated with granitoid rocks, Mecsek Mountains, Hungary

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Abstract

Changes in mineral chemistry were determined in a mafic series represented by mylonitized amphibolite and amphibole-bearing gneiss enclaves in contact with or embedded in the Hercynian granitoid complex of the Mecsek Mts, The main trend of isomorphic substitutions in amphibole is intermediate between the tremolite ↔ tschermakite and tremolite ↔ pargasite, being the same both in the mylonitized amphibole and in the enclaves. Mineral associations and chemical changes in amphibolite and plagioclase suggest that mylonitization proceeded in prograde, amphibolite facies conditions. No signs of migmatite formation were found in the mylonitized complex. The variations in modal composition, amphibole chemistry and compositional zoning of porphyroclasts are explained by local differences in lithology, shear and metasomatic effects. -from Authors

Original languageEnglish
Pages (from-to)235-268
Number of pages34
JournalActa Geologica Hungarica
Volume37
Issue number3-4
Publication statusPublished - Jan 1 1994

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ASJC Scopus subject areas

  • Geology

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