Silicate melt inclusions in ignimbrites, Bükkalja Volcanic Field, Northern Hungary - Texture and geochemistry

Réka Lukács, György Czuppon, S. Harangi, Csaba Szabó, Theodor Ntaflos, Friedrich Koller

Research output: Contribution to journalArticle

8 Citations (Scopus)

Abstract

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, composition of the 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.

Original languageEnglish
Pages (from-to)341-358
Number of pages18
JournalActa Geologica Hungarica
Volume45
Issue number4
DOIs
Publication statusPublished - 2002

Fingerprint

melt inclusion
silicate melt
ignimbrite
texture
geochemistry
magma chamber
clast
glass
quartz
magma
crystal
phenocryst
accessory mineral
ilmenite
orthopyroxene
rock
plagioclase
volcanic eruption
Miocene
melt

Keywords

  • Bükkalja
  • Geochemistry
  • Ignimbrite
  • Pannonian Basin
  • Silicate melt inclusions

ASJC Scopus subject areas

  • Geology

Cite this

Silicate melt inclusions in ignimbrites, Bükkalja Volcanic Field, Northern Hungary - Texture and geochemistry. / Lukács, Réka; Czuppon, György; Harangi, S.; Szabó, Csaba; Ntaflos, Theodor; Koller, Friedrich.

In: Acta Geologica Hungarica, Vol. 45, No. 4, 2002, p. 341-358.

Research output: Contribution to journalArticle

Lukács, Réka ; Czuppon, György ; Harangi, S. ; Szabó, Csaba ; Ntaflos, Theodor ; Koller, Friedrich. / Silicate melt inclusions in ignimbrites, Bükkalja Volcanic Field, Northern Hungary - Texture and geochemistry. In: Acta Geologica Hungarica. 2002 ; Vol. 45, No. 4. pp. 341-358.
@article{5e0c5efc27d946d78a989c2ab037f9ba,
title = "Silicate melt inclusions in ignimbrites, B{\"u}kkalja Volcanic Field, Northern Hungary - Texture and geochemistry",
abstract = "Silicate melt inclusions are frequent in the phenocryst phases (quartz, plagioclase, orthopyroxene, ilmenite and accessory minerals) of the Miocene silicic pyroclastic rocks of the B{\"u}kkalja 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 B{\"u}kkalja 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, composition of the 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 Hars{\'a}ny 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.",
keywords = "B{\"u}kkalja, Geochemistry, Ignimbrite, Pannonian Basin, Silicate melt inclusions",
author = "R{\'e}ka Luk{\'a}cs and Gy{\"o}rgy Czuppon and S. Harangi and Csaba Szab{\'o} and Theodor Ntaflos and Friedrich Koller",
year = "2002",
doi = "10.1556/AGeol.45.2002.4.2",
language = "English",
volume = "45",
pages = "341--358",
journal = "Central European Geology",
issn = "1788-2281",
publisher = "Akademiai Kiado",
number = "4",

}

TY - JOUR

T1 - Silicate melt inclusions in ignimbrites, Bükkalja Volcanic Field, Northern Hungary - Texture and geochemistry

AU - Lukács, Réka

AU - Czuppon, György

AU - Harangi, S.

AU - Szabó, Csaba

AU - Ntaflos, Theodor

AU - Koller, Friedrich

PY - 2002

Y1 - 2002

N2 - 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, composition of the 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.

AB - 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, composition of the 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.

KW - Bükkalja

KW - Geochemistry

KW - Ignimbrite

KW - Pannonian Basin

KW - Silicate melt inclusions

UR - http://www.scopus.com/inward/record.url?scp=0036916713&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0036916713&partnerID=8YFLogxK

U2 - 10.1556/AGeol.45.2002.4.2

DO - 10.1556/AGeol.45.2002.4.2

M3 - Article

VL - 45

SP - 341

EP - 358

JO - Central European Geology

JF - Central European Geology

SN - 1788-2281

IS - 4

ER -