DBPapers
DOI: 10.5593/SGEM2014/B12/S2.059

HYDRODYNAMIC CONDITIONS OF AQUIFERS SYSTEMS FROM SOUTHERN SLOPE OF BUCEGI MASSIV, ROMANIA

A. Istrate, M. N. Frinculeasa
Wednesday 1 October 2014 by Libadmin2014

References: 14th International Multidisciplinary Scientific GeoConference SGEM 2014, www.sgem.org, SGEM2014 Conference Proceedings, ISBN 978-619-7105-08-7 / ISSN 1314-2704, June 19-25, 2014, Book 1, Vol. 2, 465-472 pp

ABSTRACT
Mountains immediately to the north of a major tectonic nature contact, marked by overthrust fault, after which Central-Carpathian unit mounts over internally flysch unit. A stack thick sediment accumulation has occurred in the conditions of initiation of collision, which Carpathian foreland from South and East down under the intra-Alpine plate, when a marine border is formed with a relatively narrow shelf and a continental slope which leading down to fore-syncline, that opened outside the Carpathian arch. Sedimentation occurred in the conditions of a high cliff consists of a coating of Jurassic deposits and probably Triassic, which stayed directly on crystalline basement. Thus, in the shelf perimeter, on the Lower Cretaceous level was accumulated, under marine transgression conditions, a stack of detrital deposits like breccia, sandstones and conglomerates, totaling over 1500 m in thickness. Outside, on the continental slope and into the fore-syncline were accumulated rhythmic flysch deposits totaling 2500 m in thickness. Analyzed aquifer systems are located on the outer edge of the shelf, where on the synclinore level expressed in the crystalline foundation consisting of two syncline folds, form the structure of Raciu, Piscu cu Brazi, and Orlea mountains, from Ialomita –Dâmboviţa interfluve. The filling of the two folds was made under transgressive conditions, the sedimentation debuting with calcareous breccia and continuing with sandstones and conglomerates. To determine the hydrodynamic conditions in the confined aquifer systems from Raciu -Piscu cu Brazi synclines were combined geological and geophysical methods of investigation, into a tectonic juncture complicated by major longitudinal and transverse faults. Thus, it could be highlighted the role of crustal fault along the Ialomita valley which serves as a contour condition and divide on the syncline level two independently hydrodynamic aquifers systems. However, geophysical investigations allowed the determination of other boundary condition, namely, the thickness of the aquifer along the Ialomita valley, which made it possible to assess the potential of the underground aquifer. This allowed quantitative assessment of groundwater structures to develop projects for capacity expansion of water supply for downstream communities.

Keywords:subduction fault, shelf, continental slope, fore-syncline, syncline, aquifer system, hydrodynamic conditions, contour condition, aquifer potential