Mezősi, József

Molnár, Erika

English

In the major part of the Algyő-area and in the southern part of the Danube—Tisza Interfluve the overwhelming majority of the basement complex under the Pannonian sediments is constituted by Variscian metamorphites of simple mineral composition in general. In the Algyő-area a sediment series of 2600 to 2800 metres thickness had developed during the Pliocene and Pleistocene periods. The temperature and pressure conditions reached only the thermal and pressure values of the methydric zone while they did not reach those of the diagenetic zone. This fact is proved by the existing mineral paragenesis. On the basis of the data calculated from the chemical composition of the Lower Pannonian basal conglomerates, sandstones and aleurites sampled from different depths, the ACF and A'KF triangular diagrams were drawn. On the basis of the projection points got in such a way the picture of the green schist facies of lower temperature became distinct and which contained quartz, albite, muscovite, biotite and chlorite as critical mineral and on this basis it is similar to the paragenesis of the Abukuma-type. In the AFM diagram chlorite covered nearly the same projection area than that of the literature data, while in case of biotite it is obvious that the members of this area are richer in Mg. The Lower Pannonian sediment series of several hundred metres thickness lying on the basement complex is the substance of the erosion area of nearly the same structure where, after deposition of the basal conglomerate, erosion of W-E direction is to be taken into consideration

Mineral facies investigation in the Algyő-area

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University of Szeged