Acta Geologica Hungarica
Volume/Issue:
Volume 45: Issue 1
Mineralogy and genesis of primary alunites from epithermal systems of Hungary
Authors:
Bernadett Bajnóczi Laboratory for Geochemical Research, Hungarian Academy of Sciences, Budapest, Hungary H-1112 Budapest, Budaörsi út 45, Hungary

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Ferenc Molnár Department of Mineralogy, Eötvös L. University, Budapest, Hungary H-1117 Budapest, Pázmány P. sétány 1/c, Hungary

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Katsuhiko Maeda Department of Earth Resources Engineering, Kyushu University, Fukuoka, Japan 6-10-1 Hakozaki, Higashi-ku, Fukuoka 812-8581, Japan

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Et al. Department of Earth Resources Engineering, Kyushu University, Fukuoka, Japan 6-10-1 Hakozaki, Higashi-ku, Fukuoka 812-8581, Japan

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Pages:
101–118
Online Publication Date:
19 Jul 2005
Publication Date:
01 Apr 2002
Article Category:
Research Article
DOI:
https://doi.org/10.1556/ageol.45.2002.1.6
Keywords:
Epithermal; Epithermal; Epithermal; Epithermal; low-sulfidation; high-sulfidation; alunite; stable isotope; Al-sulfate-phosphate minerals
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Alunites from the low sulfidation-type epithermal systems of the Tokaj and the high sulfidation-type epithermal systems of the Velence Mountains were compared in terms of mineralogical and genetic aspects Na-enriched (1.14 to 2.35% Na2O) tabular alunites from the advanced argillic alteration zones of the Velence Mountains appear in the cavities formed from leached phenocrysts of andesitic rocks. These magmatic-hydrothermal alunites display compositional zoning due to variation in Na and K content and contain Ca-rich phosphate-sulfates with REE elements in their cores (i.e., woodhouseite series). The source of P is probably magmatic apatite that dissolved during intensive leaching of the host rock by acidic magmatic-hydrothermal fluids. Alunites in the steam-heated alteration zones of the Tokaj Mountains appear in the cavities formed from leached pumice fragments of rhyolite tuff units or in fractures in altered rhyolite domes. Rhombohedral and platy alunites have minor Na content (0.02 to 0.61%Na2O) and display compositional zoning due to the variation in Ba content. However, comb alunites contain more Na (1.55 to 1.82% Na2O) and compositional zoning can be attributed to variation of Na and K content. Alunites from the Velence Mountains have much higher d34S values (24.2 to 25.3‰) compared to alunites from the Tokaj Mountains (4.7 to 8.6‰). The d18O values for the sulfate site in the alunite structure are between 10.6 and 13.6‰ in both areas. High d34S values can be attributed to S isotope fractionation during the high temperature magmatic-hydrothermal formation of alunite from the Velence Mountains, which did not occur during formation of low-temperature steam-heated alunites from the Tokaj Mountains.

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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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Year of
Foundation		 1952
Publication
Programme		 changed title
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per Year		  
Founder Magyar Tudományos Akadémia  
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Address		 H-1051 Budapest, Hungary, Széchenyi István tér 9.
Publisher Akadémiai Kiadó
Publisher's
Address		 H-1117 Budapest, Hungary 1516 Budapest, PO Box 245.
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Publisher		 Chief Executive Officer, Akadémiai Kiadó
ISSN 0236-5278 (Print)
ISSN 1588-2594 (Online)

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