Original paper

Microstromatolitic deposits on granitic monuments: development and decay

Blázquez, Francesca; Garcia-Vallès, Maite; Krumbein, Wolfgang E.; Sterflinger, Katja; Vendrell-Saz, Mario

European Journal of Mineralogy Volume 9 Number 4 (1997), p. 889 - 902

24 references

published: Jul 23, 1997
manuscript accepted: Jan 28, 1997
manuscript received: Feb 15, 1996

DOI: 10.1127/ejm/9/4/0889

BibTeX file

ArtNo. ESP147050904017, Price: 29.00 €

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Abstract

Abstract Biocolonization and colour change, patina and microstromatolite formation were studied by analysing the mineralogy, chemistry, petrology and biological activity on two granitic monuments in the Mediterranean area. Based on these analyses and laboratory experiments with isolated micro-flora, it is concluded that: i) black yeasts and meristematically growing black fungi develop on and within granitic rocks and comprise the same genera and species associated with both marble and limestone monuments; ii) on sheltered but episodically wet surfaces, a surface biofilm or microbial mat gives rise to mineral deposition which traps air-borne dust resulting in a monoor multilayered patina that can be regarded as a micro-stromatolite or monument stromatolite; and iii) the main minerals in this patina are calcite, Ca-oxalate, gypsum and Ca-phosphate, none of which is influenced by the substrate, and they must thus be regarded as the product of the stromatolite forming micro-flora

Keywords

patinacalciteCa-oxalategypsumbiomineralizationgranitemonuments