Abstract
Caves with hot springs and speleothem deposits are infrequent environments of high scientific interest due to their unique environmental conditions. The selected site is a small open cave with a hot spring and stalactites in the Aedipsos area (NW Euboea Island, Greece), which was studied through an interdisciplinary approach. The mineralogical composition of the speleothems was determined by optical microscopy, XRD, and SEM-EDS microanalysis, and identification of the Cyanobacteria species was made based on morphological characteristics. The main mineral phase in the studied samples is calcite, with several trace elements (i.e., up to 0.48 wt.% Na2O, up to 0.73 wt.% MgO, up to 4.19 wt.% SO3, up to 0.16 wt.% SrO and up to 2.21 wt.% Yb2O3) in the mineral-chemistry composition. The dominant facies are lamination and shrubs, which are the most common among the facies of the thermogenic travertines of the area. Based on the studied stalactites, twenty-nine different Cyanobacteria species were identified, belonging to the following orders: Synechococcales (28%), Oscillatoriales (27%), Chroococcales (21%) and Nostocales (21%), and Spirulinales (3%). Among them, thermophilic species (Spirulina subtilissima) and limestone substrate species (Chroococcus lithophilus, Leptolyngbya perforans, and Leptolyngbya ercegovicii) were identified. The identified Cyanobacteria were found to participate in biomineralization processes. The most characteristic biomineralization activity is made by the endolithic Cyanobacteria destroying calcite crystals in the outer layer. In a few cases, calcified cyanobacterial sheaths were detected. The presence of filamentous Cyanobacteria, along with extracellular polymeric substance (EPS), creates a dense net resulting in the retention of calcium carbonate crystals.
Subject
Ocean Engineering,Water Science and Technology,Civil and Structural Engineering
Reference52 articles.
1. Modern cryptic microbialite/metazoan facies from Lizard Island (Great Barrier Reef, Australia): Formation and Concept;Reitner;Facies,1993
2. Lowenstam, H.A., and Weiner, S. (1989). On Biomineralization, Oxford University Press.
3. Konhauser, K. (2007). Introduction to Geomicrobiology, Blackwell Publishing.
4. Geitleria calcarea n. gen. et n. sp., a new atmophytic lime-encrusting blue-green alga;Friedman;Bot. Not.,1955
5. Quelques stations françaises de Geitleria calcarea, Cyanophycee cavernicole;Bourrelly;Schweiz. Z. Hydrol.,1973
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