DUST2014 - International Conference on Atmospheric Dust

The meeting was organized by the Associazione Italiana per lo Studio delle Argille - onlus (AISA, Italian Association for the Study of Clays) and the Istituto di Metodologie per l’Analisi Ambientale (IMAA, Institute of Methodologies for Environmental Analysis), National Research Council of Italy (CNR). The scientific program of the meeting included 5 plenary lectures, 313 oral and 153 poster contributions. All the contributions were revised by 72 international experts, many of them being the conveners of the 34 sessions dealing with the seven themes of the Conference: Chemical & Mineralogical Studies, Geological Records, Health & Environment, Instrumentations & Measurements, MF: Modelling & Field Studies, The Universe of Dust - General Session.

ORAL PRESENTATION: Aeolian dust derived Plio-Pleistocene re palaeosols in the Carpathian Basin
Aeolian dust deposits, covering more than half of the Carpathian Basin in Central Europe, form thick (up to 50 m) loess-paleosol sequences that are generally underlain by terrestrial red clays. These deposits provide information on the palaeoclimatic and palaeoenvironmental changes of the last 3–3.5 million years. The Upper and partly, the Middle Pleistocene loess deposits are intercalated by steppe, forest-steppe and brown forest soils, while the older pedogene horizons are different kinds; these are red, Mediterranean-type soils. The younger soils were formed from the underlying loess deposits, while according to preliminary data, interglacial dust deposition could have played more dominant role during the formation of the older ones, similarly to certain types of red clays. Grain size, geochemical, (clay) mineralogical, micromorphological and scanning electron microscopic (SEM) analyses have been elaborated on major Hungarian red clay-loess-palaeosol sequences to get more information on aeolian dust deposition and its role in syngenetic, accretionary soil development even during periods characterized by relatively higher temperatures and rainfall.
The detailed granulometric analyses of the red clays and red palaeosols represent similarity in terms of their bimodal grain-size distribution patterns with loess horizons, while the SEM images also show an aeolian origin of the extracted quartz grains characterized by sharp edges, breaks and stepped surfaces. The geochemical and (clay) mineralogical analyses suggest that climate during the formation of red clays and red palaeosols was considerably more humid and warmer in comparison to younger interglacials or to modern values.

No comments:

Post a Comment