Electron microscopic investigations of sand material in the core drillings in the Great Hungarian plain

Abstract

The study may inform about the electron microscopic investigation of the sand layers in seven core drillings in the Danube-Tisza Interfluve region. The primary aim of the investigations was to obtain exact data about the blown sand layers under the surface. In five out of six drillings on the alluvial fan of the Danube blown sand layers were explored (the number of layers varied between 2 and 7). There were apparently phases in the formation of the alluvial fan when on certain parts flooding was replaced by eolian processes. The blown sand layers under the surface, however, are only several metres thick at the most. The seventh drilling (at J~noshalma) proves that this region constitutes the continuation of Transdanubia and does not belong to the alluvial fan of the Danube. At J~noshalma the driller bored through 26 loess, sandy loess, and loessy sand layers, and more than 10 blown sand layers under the surface in the Quaternary sequence.

High‐resolution stratigraphy of Quaternary fluvial deposits in the Makó Trough and the Danube‐Tisza Interfluve, Hungary, based on magnetic susceptibility data

“…Mollusc (Krolopp in Franyó 1980) and scanning electron microscopic (Borsy et al . 1987) data revealed alternating fluvial, lacustrine and aeolian conditions, disproving the onset of overall aeolian development.…”

Aeolian surface transformations on the alluvial fan of the Nyírség

“…Winds re-worked sandy sediments on the surface in the dry periods of the Würm then fluvial sediment series covered the aeolian deposits in the wetter periods. Although there is no direct evidence for this in the Nyírség but the presence of wind-blown sand in the deeper strata of the alluvial fan was detected with the help of electronmicroscopic analysis of sandy sediments from cores drilled in the Danube-Tisza Interfluve (Borsy et al, 1987). Applying electron-microscopic analysis on the sandy sediments of the alluvial fan of the Nyírség in the future the aeolian or fluvial development of the strata could be determined.…”

New Radiocarbon Data from the Paleosols of the NYíRSéG blown Sand Area, Hungary

“…We have little information about sand movement (Borsy et al 1987) and soil formation during the Upper Pleniglacial in the blown-sand areas of Hungary. During this period, the climate was cold and dry, and the annual mean temperature in Hungary was –1 to –3°C, –1 to –13°C in January and 11 to 13.5°C in July.…”

“…In order to extend arable lands, deforestation was also widespread in the 18th and 19th centuries. As a result, sand was mobilized again in areas that had been deforested (Marosi 1967; Borsy 1980, 1987,1991; Lóki 2003; Buró et al 2016).…”