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  • Author or Editor: Mária Földvári x
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In this paper, data on the mineralogical composition of samples and a summary of those results are given (through a more detailed analysis of measurement data by using instrumental phase analytical methods concerning the examined boreholes of the two areas) that allow for the characterization of the loess and red clay sequences. The aim of our study was to characterize and correlate rocks in both areas using instrumental tests performed on samples from borehole drilled in the Hegyhát and Üveghuta areas.

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Thermoanalytical (TA) analysis is not at all a frequently used method for studying travertine. Therefore the application of two TA techniques is presented for characterization of the Buda-Vár-hegy (Castle Hill), Budakalász and Szomód-Les-hegy Quaternary travertine occurrences in this paper. TA data give comparable results with those of oxygen and carbon stable isotope compositions and offer a new way to estimate the temperature of carbonate precipitation.

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Abstract

There is little data on the mineralogy of carbonate pedofeatures in the calcareous soils in Hungary which belong to the European prairie ecodivision. The aim of the present study is to enrich these data.

The mineralogical composition of the carbonate pedofeatures from characteristic profiles of the calcareous soils in Hungary was studied by X-ray diffractometry, thermal analysis, SEM combined with microanalysis, and stable isotope determination.

Regarding carbonate minerals only aragonite, calcite (+ magnesian calcite) and dolomite (+proto-dolomite) were identified in carbonate grains, skeletons and pedofeatures.

The values relating, respectively, to stable isotope compositions (C13, O18) of carbonates in chernozems and in salt-affected soils were in the same range as those for recent soils (latter data reported earlier). There were no considerable differences between the values for the carbonate nodules and tubules from the same horizons, nor were there significant variations between the values of the same pedofeatures from different horizons (BC-C) of the same profile. Thus it can be assumed that there were no considerable changes in conditions of formation.

Tendencies were recognized in the changes of (i) carbonate mineral associations, (ii) the MgCO3 content of calcites, (iii) the corrected decomposition temperatures, and (iv) the activation energies of carbonate thermal decompositions among the various substance-regimes of soils.

Differences were found in substance-regimes types of soils rather than in soil types.

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