| Popis: |
Discovered in 1957, the Ensemble Basarabi–Murfatlar is one of the most impressive archaeological sites from Europe. The monument is situated on a hill chalk cliff, and is built from amorphous calcium carbonate, very sensitive to moisture, frost, salts, as the most important and common causes of monuments degradation. The calcite dissolution is affected by the presence of foreign ions, Mg2+ (from MgSO4 ⋅ 7H2O and MgSO4 ⋅ 6H2O) and Na+ (from Na2SO4 ⋅ 10H2O and Na2SO4), being the major cations in seawater and groundwater. Also, the anions SO 4 2 and Cl− are favouring the calcite conversion to gypsum and is responsible for stone wall dissolution. Some petrographic and physico-chemical (X-ray fluorescence energy dispersive (EDXRF), thermal analysis, ICP-AES of wall samples are presented in this paper. The influence of Fântâniṭa Lake water (Chalk Lake) composition situated very close to the church is discussed, pointing out the salts migration from the lake to the church wall. |
