Hidrológiai Közlöny, 2014 (94. évfolyam)
2014 / 2. szám - Molnár Béla - Jenei Mária - Bedbur, Echart - Schmitt, Manfred: Tavak és tavi karbonátok sajátosságai a Duna-Tisza közén
12 HIDROLÓGIAI KÖZLÖNY 2014. 94. EVF. 2. SZ. Szakáll S.-Kovács-Pálfy P-Sajó I.-Kovács Á. 2006: Magyarország só- kivirágzások ásványtani vizsgálata. Topograhia Mineralogica Hungáriáé IX. szerk. Szakáll S. pp. 44-60, Miskolc. Szendrei G. - Tóth T. - Kovács - Pálfy P. - Sajó 1. - Szakáll S. - Kovács A. 2006: A talajfelszíni sókivirágzások elterjedése Magyarországon Topographia Mineralogica IX. szerk. Szakáll S. pp. 61-77, Miskolc. Szépfalusi J. 1970: A délalföldi szikes tavak kémiai vizsgálata. Hidrol. Tájékoztató 10 pp. 132-134. A kézirat beérkezett: 2014. február 6-án Characteristics of lakes and lake-carbonats in the Danube-Tisza Interfluwe in Hungary Molnár, B. Abstract: According to experiments implemented so far, dolomite can not be produced in lab conditions under the of 100 °C. Deposite these results, dolomite formation is clearly observable in and characteristic for the shallow alkaline ponds of the Danube-Tisza Interfluwe in Hungary. The major prerequisites for carbonate precipitation from these waters, including the mineral dolomite, are the following: the presence of available dissolved Ca, Mg int he water, plus the COi/Ca ratio should at least be betwen the values of 7 and 12. The major chemical and phisical properties of lacustrine carbonates from the area of Danube-Tisza Intefluwe in Hungary have been fully described int he works of pervious researchers. However, none of the studies dealt with the properties of the water from wich these carbonates were precipiatated. Several sampling sites were assigned int he study area of Danube-Tisza Interfluwe as the first part of our study. The majority of these sites include alkaline lakes and artifical diches, plus 5 individual groundwater monitoring wells established in the vicinity of the ponds. The geological makeup of the boreholes was carefully studied and water samples were collected monthly from the assigned sampling sities for a period of successive more as three years in oder to be able to track annual changes int he chemical composition of the water. For comparison further water samples were taken from the rivers Danube and Tisza and ponds located in arid and humid climatic condition The Chemical composition on the studied groundwater samples was highly patially. There are major differences observable between the individual sites, not to mention the accented annual changes. Water occupying the near-surface unconfined aquifers and perching the surface as well are characterized by even more accented annual variation regarding their chemistries. The recording pH values and total dissolved salt content of both collected groundwater samples and surficial water samples display high variance spatially with the most extreme values recorded for the pH being between 6.7 and 10.0. The recorded total salt content was around 1000-11 000 mg/l. The ratio of Mg/Ca is not the same in all samples. In some places this ratio favors the formation of high-magnesium calcite, wich are syngenetically transformed into dolomite. The COi/Ca ratio was higher than one in all cases. According to the results of stable isotopic studies of surficial and groundwater samples deriving from the study area of the Danu- e-Tisza Interfluwe, 4 major groups of water could have been differenciated . Based ont the stabile isotop, organic content and inorganic carbonate twoo major carbonate types could have extraction of water plants. Inorganic carbonate precipitation was manly controlled by the carbon dioxide excraction of water plants. Inorganic carbonate where was inorganic origin of carbonates (dolomite)
