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EVOLUTION CONDITIONS OF ROMANIAN PLAINE DURING THE QUATERNARY PERIOD
Abstract
Romanian Plain occupies from the geotecto nic point of view, the northern part of Moesian Platform, a platform forming a ri gid block between the Carpathians and the Balkans. Dacian Basin, opened after tecton ic movements, badenian , in the Sarmatian, outside the Carpathian arch, has evolved in a brackish sedimentation environment by the end of the Pliocene, after which was installed a lacustrine environment amid of water body restriction only in the southern pa rt of Romania. The lacustrine system is installed in Quaternary amid climate cooling and morphological changes of the surrounding region and sedimentation basin. Basin silting was originally produced from the Carpathian chain, from north and from the Moesian platform south of Danube, which was in emerged position. Lacustrine sedimentation dominates in this phase of the material transported by river systems in the Carpathians and the southern frame of sedimentary basin. In a later phase, the conditions of sedime ntation are diverse amid of dramatic global climate changes and dacic lake system withdrawal to the east. Closure of the western part of the Moesian Platform determined lake system migration eastward from the Middle Pleistocene, and in the closing phase (the Holocene), to north-eastern Romanian Plain. Under these conditions Quater nary succession is complete only in the Romanian Plain to the east of the Arges river, where it reaches considerable thickness, above. 400 m. The lower limit of the Quaternary agreed to 1.8 Ma, since 1948, was confirmed by studying marine sediments from Vrica point (1985), and located approx. 4 km south of the peninsula of Calabria (Italy). Since 2009 the question of changing this limit based on studies made at Monte San Nicola in southern Sicily, to 2.558 Ma, which coincides with the Gauss-Matuyama magnetic reversal and Calabrian - Piacenzian limit, which is also the limit to the Pliocene. New chronostratigraphical scale of the Quater nary fits much better climatic conditions for the submission of the Romanian Plain sedimentary sequences and can clarify the position of geomorphological subunits. For example, the lower Quaternary was placed in the final sequence of the CГўnde Еџti strata. After the new geochronological scale this sequence falls completely in Lower Quaternary and corresponds to the evolution realities of th e dacic lake system in the Romanian Plain. 11th International Multidisciplinary Scientific GeoConference SGEM2011 www.sgem.org International Multidisciplinary Scientific GeoConference SGEM 2011 70
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