Genesis of garnets in some magmatic rocks from Hungary |
| |
| Authors: | Dr A Embey-Isztin Dr Gabriella Noske-Fazekas Doc Dr G Kurat Dr F Brandstätter |
| |
| Institution: | (1) Present address: Mineralogical and Petrological Department, Hungarian Natural History Museum, Muzeum krt. 14-16, H-1088 Budapest, Hungary;(2) Present address: Mineralogisch-Petrographische Abteilung, Naturhistorisches Museum, Postfach 417, A-1014 Wien, Austria |
| |
| Abstract: | Summary Garnets from Miocene di-normative, medium-K andesites as well as from a Mesozoic fine-grained albite granite have been petrologically investigated. The chemical compositions of the garnets from the andesites as determined by electron microprobe (alm 57–65,pyr 14–22,gross 10–24,spess 2–5, -all in mol.-%) are compatible with the garnets being high pressure megacrysts. Garnets from the granite (alm 71–74,pyr 12–18,gross 3.5–5.5,spess 5.6–11) apparently crystallized in a low pressure environment. They are believed to have formed in an autometasomatic event.
Die Genese von Granaten in einigen magmatischen Gesteinen Ungarns Zusammenfassung Granate aus miozänen di-normativen, medium-K Andesiten und aus einem mesozoischen feinkörnigen Albit-Granit wurden petrologisch untersucht. Die chemische Zusammensetzung der Granate, (Alm 57–65,Pyr 14–22,Gross 10–24,Spess 2–5 Mol.-%), gemessen mittels Elektronenstrahl-Mikrosonde, macht es wahrscheinlich, daß diese Granate Hochdruck-Megakristalle sind. Die Granate im Granit (Alm 71–74,Pyr 12–18,Gross 3,5–5,5,Spess 5,6–11) kristallisierten bei niedrigen Drücken und sind wahrscheinlich das Produkt autometasomatischer Vorgänge.
With 7 Figures |
| |
| Keywords: | |
| 本文献已被 SpringerLink 等数据库收录！ |
|
