Acta Geologica Hungarica
Volume/Issue:
Volume 45: Issue 4
Silicate melt inclusions in ignimbrites, Bükkalja Volcanic Field, Northern Hungary - texture and geochemistry
Authors:
Réka Lukács Department of Petrology and Geochemistry, Eötvös University H-1117 Budapest, Pázmány Péter sétány 1/c, Hungary

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György Czuppon Department of Petrology and Geochemistry, Eötvös University H-1117 Budapest, Pázmány Péter sétány 1/c, Hungary

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Szabolcs Harangi Department of Petrology and Geochemistry, Eötvös University H-1117 Budapest, Pázmány Péter sétány 1/c, Hungary

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Csaba Szabó Department of Petrology & Geochemistry Lithosphere Fluid Research Labor (LRG), Eötvös University H-1117 Budapest, Pázmány Péter sétány 1/c, Hungary

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Theodor Ntaflos University of Vienna, Geozentrum, Institute of Petrology, Vienna Althanstrasse 14, A-1090 Vienna, Austria

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Friedrich Koller Department of Geological Sciences, University of Vienna A-1090 Vienna, Althanstrasse 14, Austria

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Pages:
341–358
Online Publication Date:
22 Jul 2005
Publication Date:
01 Nov 2002
Article Category:
Research Article
DOI:
https://doi.org/10.1556/ageol.45.2002.4.2
Keywords:
geochemistry; geochemistry; geochemistry; Pannonian Basin; silicate melt inclusions; ignimbrite; Bükkalja
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Silicate melt inclusions are frequent in the phenocryst phases (quartz, plagioclase, orthopyroxene, ilmenite and accessory minerals) of the Miocene silicic pyroclastic rocks of the Bükkalja Volcanic Field, Northern Hungary. These melt inclusions were trapped at different stages of magma evolution; therefore, they provide important information on the petrogenetic processes. The melt inclusions in the Bükkalja pyroclastic rocks show various textures such as (1) wholly enclosed type; (2) hourglass inclusions and (3) reentrant or embayment glass. Among the wholly enclosed type melt inclusions further textural subgroups can be distinguished based on their shape: negative crystal, rounded, elongated and irregular shaped. These various textures reflect differences in the time of entrapment prior to eruption and in the post-entrapment condition in the magma chamber. The largest textural variation was found in the quartz-hosted melt inclusions. However, the major element compositions of these melt inclusions do not differ from one another in the same unit. In general, compositions of the melt inclusions are similar to the chemistry of the glass shards. Comparing the composition of the quartz-hosted melt inclusions from three main ignimbrite units (Lower, Middle and Harsány Ignimbrite Units), slight differences have been recognized, suggesting distinct erupted host magmas. Melt inclusions from the andesitic lithic clast of the Lower Ignimbrite Unit could represent heterogeneous interstitial melt in the crystal mush zone at the magma chamber wall. The largest geochemical variation was found in the melt inclusion of the Middle Ignimbrite Unit, even in single samples. This compositional variation overlaps that of the rhyolitic juvenile clasts, but does not match that of the glasses of scoria clasts. We suggest that syn-eruptive magma mixing (mingling) occurred in a compositionally heterogeneous magma chamber of the Middle Ignimbrite Unit.

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Cover Acta Geologica Hungarica
Acta Geologica Hungarica
Print ISSN:
0236-5278
Online ISSN:
1588-2594

Acta Geologica Hungarica
Language English
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