Mineralogical, geochemical and microfabric evidences of gypsum crusts

A case study from Budapest

Siegfried Siegesmund, A. Török, Andre Hüpers, Christian Müller, Werner Klemm

Research output: Contribution to journalArticle

31 Citations (Scopus)

Abstract

High levels of SO2 and particulate pollution enable the rapid development of gypsum-rich weathering crusts in Budapest. Two types of white crusts, thin and thick ones, and two forms of black crusts, laminar and framboidal ones, were studied in limestone buildings of the parliament and Citadella. The percentage of crust cover and damage categories were documented on selected walls. Petrographic, XRD, XRF and sulphur isotope analyses were performed under laboratory conditions to understand the mechanism of crust formation. White crusts found both on exposed and sheltered walls display a calcite-rich layer with gypsum, while black crusts are enriched with gypsum. The sulphur isotopic composition of white and black crusts overlaps, but the crusts are slightly enriched in heavy isotopes compared to rainwater. S content, Si/Al ratios and particulates in black crusts suggest that air pollution (SO 2, dust) contributes to black crust formation. The accumulation of sulphur and Zn enrichment of white crusts were also documented indicating that under high pollution levels, even these compound can accumulate on exposed facades.

Original languageEnglish
Pages (from-to)369-381
Number of pages13
JournalEnvironmental Geology
Volume52
Issue number2
DOIs
Publication statusPublished - Mar 2007

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Calcium Sulfate
Gypsum
gypsum
sulfur
Sulfur
Calcium Carbonate
crust
case studies
Isotopes
Sulfur Isotopes
isotopes
particulates
Pollution
pollution
Facades
Calcite
air pollution
calcite
Weathering
Limestone

Keywords

  • Air pollution
  • Geochemistry
  • Gypsum
  • Limestone
  • Weathering crust

ASJC Scopus subject areas

  • Earth and Planetary Sciences (miscellaneous)
  • Environmental Science(all)
  • Environmental Chemistry
  • Water Science and Technology

Cite this

Mineralogical, geochemical and microfabric evidences of gypsum crusts : A case study from Budapest. / Siegesmund, Siegfried; Török, A.; Hüpers, Andre; Müller, Christian; Klemm, Werner.

In: Environmental Geology, Vol. 52, No. 2, 03.2007, p. 369-381.

Research output: Contribution to journalArticle

Siegesmund, Siegfried ; Török, A. ; Hüpers, Andre ; Müller, Christian ; Klemm, Werner. / Mineralogical, geochemical and microfabric evidences of gypsum crusts : A case study from Budapest. In: Environmental Geology. 2007 ; Vol. 52, No. 2. pp. 369-381.
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