Új ásványtani adatok a mád környéki savanyú vulkanitokból (tokaji-hegység)

Translated title of the contribution: New mineralogical data concerning volcanites from the district of Mád, in North East Hungary (Tokaj Mts)

Adrienn Menyhárt, I. Dódony, Péter Pekker

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

This study presents new data on mordenite and clinoptilolite, rectorite, iron oxide, halloysite, smectite and SiO2 phases from quarries in hydrothermally altered rhyolite tuff, in the environs of Mád, Tokaj Mts., NE Hungary. X-ray powder diffraction (XRPD), scanning (SEM) and transmission electron microscopic (TEM, HRTEM, ATEM) techniques were used to identify minerals and gain more details about their occurrence. An unusual iron oxide/hydroxide phase (that had earlier been considered as haematite/hydrohaematite) was recognised at Király Hill. Although its XRPD diagram shows reflections which can be interpreted as haematite, according to TEM data neither its structure nor its chemical composition comply with that of haematite. Király Hill was identified as a new locality of halloysite. The X-ray powder diffraction study of a sample from the Bomboly area indicates rectorite (as was known earlier); however, TEM images show only separate illite and smectite crystals, without any evident structural interrelation between them. A Suba-oldal smectite and an SiO2 phase can also be found. Using TEM the thickness of the individual smectite flakes was determined and the SiO2 phase could be identified as cristobalite (HRTEM- high resolution TEM). The zeolite minerals were identified on the basis of sets of their D(hkl) values and symmetries measured on selected areaelectron diffraction patterns (SAED). Their respective compositions were quantified simultaneously using energy dispersive X-ray (EDX) spectra which were acquired on the corresponding areas. The hydrothermally altered rhyolite tuff at Harcsa-teto{double acute} (Harcsa Hill) contains an Na-free, Ca-containing zeolite; according to XRPD results this corresponds to mordenite. On the other hand, in the Suba-oldal area clinoptilolite occurs with additional Mg and K as exchangeable cations.

Original languageHungarian
Pages (from-to)257-266
Number of pages10
JournalFoldtani Kozlony
Volume141
Issue number3
Publication statusPublished - 2011

Fingerprint

transmission electron microscopy
X ray powder diffraction
smectite
Transmission electron microscopy
rectorite
X-ray diffraction
hematite
Zeolites
mordenite
halloysite
clinoptilolite
rhyolite
tuff
zeolite
iron oxide
Minerals
cristobalite
Quarries
mineral
Chemical analysis

ASJC Scopus subject areas

  • Geochemistry and Petrology
  • Geology
  • Palaeontology
  • Stratigraphy

Cite this

Új ásványtani adatok a mád környéki savanyú vulkanitokból (tokaji-hegység). / Menyhárt, Adrienn; Dódony, I.; Pekker, Péter.

In: Foldtani Kozlony, Vol. 141, No. 3, 2011, p. 257-266.

Research output: Contribution to journalArticle

Menyhárt, Adrienn ; Dódony, I. ; Pekker, Péter. / Új ásványtani adatok a mád környéki savanyú vulkanitokból (tokaji-hegység). In: Foldtani Kozlony. 2011 ; Vol. 141, No. 3. pp. 257-266.
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AB - This study presents new data on mordenite and clinoptilolite, rectorite, iron oxide, halloysite, smectite and SiO2 phases from quarries in hydrothermally altered rhyolite tuff, in the environs of Mád, Tokaj Mts., NE Hungary. X-ray powder diffraction (XRPD), scanning (SEM) and transmission electron microscopic (TEM, HRTEM, ATEM) techniques were used to identify minerals and gain more details about their occurrence. An unusual iron oxide/hydroxide phase (that had earlier been considered as haematite/hydrohaematite) was recognised at Király Hill. Although its XRPD diagram shows reflections which can be interpreted as haematite, according to TEM data neither its structure nor its chemical composition comply with that of haematite. Király Hill was identified as a new locality of halloysite. The X-ray powder diffraction study of a sample from the Bomboly area indicates rectorite (as was known earlier); however, TEM images show only separate illite and smectite crystals, without any evident structural interrelation between them. A Suba-oldal smectite and an SiO2 phase can also be found. Using TEM the thickness of the individual smectite flakes was determined and the SiO2 phase could be identified as cristobalite (HRTEM- high resolution TEM). The zeolite minerals were identified on the basis of sets of their D(hkl) values and symmetries measured on selected areaelectron diffraction patterns (SAED). Their respective compositions were quantified simultaneously using energy dispersive X-ray (EDX) spectra which were acquired on the corresponding areas. The hydrothermally altered rhyolite tuff at Harcsa-teto{double acute} (Harcsa Hill) contains an Na-free, Ca-containing zeolite; according to XRPD results this corresponds to mordenite. On the other hand, in the Suba-oldal area clinoptilolite occurs with additional Mg and K as exchangeable cations.

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KW - Rectorite

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