Mădălina Dana POHRIB¹, Doru-Toader JURAVLE², Lilian NIACŞU², Adrian URSU², Anghel STANCIU¹ & Dorel PLĂTICĂ^1
1“Gh. Asachi” Tehnical University of Iasi, Romania;
²“Al. I. Cuza” University, 20 A, Carol I Bvd, 700505-Iasi, Romania, email: jdorut@yahoo.com

PALEOGEOGRAPHY OF THE CHERSONIAN TO MEOTIAN IN THE NORTH OF FĂLCIU HILLS (MOLDAVIAN PLATFORM) BASED ON SEDIMENTOLOGICAL DATA

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The geological drills conducted in the Pădureni area from the north of Fălciu Hills (Moldavian Plateau) have crossed through the Chersonian-Meotian sedimentary sequence. In this way we have obtained a series of supplementary lithological, mineralogical and grano-facial data which have allowed the analysis of the paleogeographical evolution on the principles of sequential stratigraphy. The investigated sequence is made up of an alternation of lutitic, siltitic and sandy deposits, with intercalations of small gravels. At the upper part there are intercalated cineritic siltites. At the base of this sequence, the drills have intercepted supergene lutitic deposits, diagnosed on the basis of mineralogical and RX data and their macrosopic aspect. In these conditions, in the studied sedimentary sequence we separated two sets of parasequences – a retrograde and a prograde one, which enter a Transgressive Systems Tract and a High-stand Systems Tract. Genetically, the sets of parasequences have been interpreted as a result of the eustatic oscillations that have affected the Paratethys, especially the Euxinic and Dacic basins. The surface draped by the supergene deposits was considered to represent the pre-Chersonian relief, described in literature as the "moldovalah surface II". In what regards the geomorphology we witnessed a conditioning of the general aspect of the relief by lithology, and at least in the case of Pădureni area the inheritance of some depressionary paleo-alignments by the hydrographic network