Bimodal pumice populations in the 13.5 Ma Harsány ignimbrite, Bükkalja Volcanic Field, Northern Hungary

Syn-eruptive mingling of distinct rhyolitic magma batches?

Réka Lukács, S. Harangi, Paul Mason, Theodoros Ntaflos

Research output: Contribution to journalArticle

9 Citations (Scopus)

Abstract

The 13.5 Ma Harsány ignimbrite, in the eastern part of the Bükkalja volcanic field, eastern-central Europe, provides a rare example of mingled rhyolite. It consists of two distinct pumice populations ('A'- and 'B'-type) that can be recognized only by detailed geochemical work. The pumice and the host ignimbrite have a similar mineral assemblage involving quartz, plagioclase, biotite and sporadic Kfeldspar. Zircon, allanite, apatite and ilmenite occur as accessory minerals. The distinct pumice types are recognized by their different trace element compositions and the different CaO contents of their groundmass glasses. Plagioclase has an overlapping composition; however, biotite shows bimodal composition. Based on trace element and major element modeling, a derivation of 'A'-type rhyolite magma from the 'B'-type magma by fractional crystallization is excluded. Thus, the two pumice types represent two isolated rhyolite magma batches, possibly residing in the same crystal mush. Coeval remobilization of the felsic magmas might be initiated by intrusion of hot basaltic magma into the silicic magma reservoir The rapid ascent of the foaming rhyolite magmas enabled only a short-lived interaction and thus, a syn-eruptive mingling between the two magma batches.

Original languageEnglish
Pages (from-to)51-72
Number of pages22
JournalCentral European Geology
Volume52
Issue number1
DOIs
Publication statusPublished - Mar 1 2009

Fingerprint

pumice
ignimbrite
rhyolite
magma
biotite
plagioclase
trace element
allanite
accessory mineral
remobilization
ilmenite
fractional crystallization
magma chamber
apatite
zircon
glass
crystal
quartz
mineral
modeling

Keywords

  • Bükkalja volcanic field
  • Ignimbrite
  • Mingling
  • Pannonian Basin
  • Pumice
  • Rhyolite

ASJC Scopus subject areas

  • Geology

Cite this

Bimodal pumice populations in the 13.5 Ma Harsány ignimbrite, Bükkalja Volcanic Field, Northern Hungary : Syn-eruptive mingling of distinct rhyolitic magma batches? / Lukács, Réka; Harangi, S.; Mason, Paul; Ntaflos, Theodoros.

In: Central European Geology, Vol. 52, No. 1, 01.03.2009, p. 51-72.

Research output: Contribution to journalArticle

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abstract = "The 13.5 Ma Hars{\'a}ny ignimbrite, in the eastern part of the B{\"u}kkalja volcanic field, eastern-central Europe, provides a rare example of mingled rhyolite. It consists of two distinct pumice populations ('A'- and 'B'-type) that can be recognized only by detailed geochemical work. The pumice and the host ignimbrite have a similar mineral assemblage involving quartz, plagioclase, biotite and sporadic Kfeldspar. Zircon, allanite, apatite and ilmenite occur as accessory minerals. The distinct pumice types are recognized by their different trace element compositions and the different CaO contents of their groundmass glasses. Plagioclase has an overlapping composition; however, biotite shows bimodal composition. Based on trace element and major element modeling, a derivation of 'A'-type rhyolite magma from the 'B'-type magma by fractional crystallization is excluded. Thus, the two pumice types represent two isolated rhyolite magma batches, possibly residing in the same crystal mush. Coeval remobilization of the felsic magmas might be initiated by intrusion of hot basaltic magma into the silicic magma reservoir The rapid ascent of the foaming rhyolite magmas enabled only a short-lived interaction and thus, a syn-eruptive mingling between the two magma batches.",
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AB - The 13.5 Ma Harsány ignimbrite, in the eastern part of the Bükkalja volcanic field, eastern-central Europe, provides a rare example of mingled rhyolite. It consists of two distinct pumice populations ('A'- and 'B'-type) that can be recognized only by detailed geochemical work. The pumice and the host ignimbrite have a similar mineral assemblage involving quartz, plagioclase, biotite and sporadic Kfeldspar. Zircon, allanite, apatite and ilmenite occur as accessory minerals. The distinct pumice types are recognized by their different trace element compositions and the different CaO contents of their groundmass glasses. Plagioclase has an overlapping composition; however, biotite shows bimodal composition. Based on trace element and major element modeling, a derivation of 'A'-type rhyolite magma from the 'B'-type magma by fractional crystallization is excluded. Thus, the two pumice types represent two isolated rhyolite magma batches, possibly residing in the same crystal mush. Coeval remobilization of the felsic magmas might be initiated by intrusion of hot basaltic magma into the silicic magma reservoir The rapid ascent of the foaming rhyolite magmas enabled only a short-lived interaction and thus, a syn-eruptive mingling between the two magma batches.

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