Consideration upon the River system in the north of the Suceava tableland



The paleoevolution of the river system in the Moldavian Tableland has undergone at a theoretical level two successive hypothetical directions. The former direction, formulated in the first half of the XXth century, alleges the existence of a river system, with a transverse character, that prolonged to the east the Carpathian river systems. Specialists of this theory, Tufescu V. (1932), M. David (1933, quoted by V. Bacauanu - 1973) and Gheorghe Nastase (1946, quoted by V. Bacauanu - 1973) based their design on the presence of horizons of gravels with Carpathian elements on some interfluves to the east of the Siret valley, and the existence of some saddles, Loznica, Bucecea and Ruginoasa, located on the left side of the same river. The latter direction, diametrically opposite, supports the idea of evolution of the river system consecutively with the Sarmato-Pliocene Sea pulling back to the south. The hypothesis is supported and substantiated by I. Sîrcu (1955), C. Martiniuc and V. Bacauanu (1960), V. Bacauanu (1968, 1973). In this context it is considered that the Prut and Siret rivers carved the oldest valleys in the tableland. The authors explain the erosional genesis of the saddles arguing their inability to create transversal rivers on the basis of continuity upstream and downstream the saddles of terrace levels with relatively high altitudes, which proves the flow continuity on consequent valleys. The research carried out along the Suceava river valley and the immediate interstream area in order to create a scenario of the valley paleoevolution highlighted the presence of crystalline lithotopes in the petrographic structure of the accumulation deposits. The presence of such petrographic elements contradicts the present-day alluvia sources of the rivers that could have transported them:  Suceava or its tributaries Solonet, Ilisasca, Scheia. The rivers spring either from the Carpathian flysch or from the former area of platform sedimentation. We consider that the current Solonet, Ilisasca, Scheia streams and valleys and, through generalization, Sucevita and Solca, have nothing in common with the Carpathian Sarmatian paleosystem that built the Suceava Piedmont. The superior flows on the eastern slope of the Obcina Mare can be accounted through a normal regressive evolution, and the current saddles are the consequence of selective erosion. The old Carpathian system changed probably because of the Wallachian movements, only Moldova and Suceava maintained their former Carpathian flows. The current system didn’t go beyond the Suceava Valley in the east, therefore we can appreciate that the river with the same name installed itself previously. The relative altitude of the oldest terrace is of 180 – 190 m, which is attributed, according to the same morphochronological scheme, to the Superior Pleistocene. By comparing the absolute altitudes of the Suceava terraces to those of the hills which preserve piedmont deposits and also to the average altitude of the latter as compared to the adjacent valleys we cannot but wonder upon the age of the landforms in the north of the Tableland. We continue to be very much interested in the evolution of the river system as a whole in the north of the Moldovenesc Tableland, especially taking into account the interesting remarks made by professor Tufescu (1985) on some deposits situated east of Bucecea saddle, where he identified elements of Mesozoic sediments.







metamorphite, river system, Quaternary paleodirections

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Barbu N., Ionesi L., Ionesi B. (1964), Masivul Ciungilor – caracterizare geologico–geomorfologica, Analele stiintifice ale univ. „Al. I Cuza“, seria noua, sectiunea II –Stiintele naturii, b. geologie-geografie, tom X, Iasi.

Barbu N., Ionesi L., Ionesi B. (1966), Observatii geologice si paleogeomorfologice în zona de contact a Obcinelor Bucovienei cu Podisul Sucevei, Analele stiintifice ale univ. „Al.

I Cuza“, seria noua, sectiunea II – Stiintele naturii, b. geologie – geografie, tom XII,Iasi.

Barbu N. (1976), Obcinele Bucovinei, Edit. Stiintifica si Enciclopedica, Bucuresti.Bacauanu V., Barbu N., Pantazica M., Ungureanu Al., Chiriac D. (1980), Podisul Moldovei. Natura, om, economie, Edit. Stiintifica si Enciclopedica, Bucuresti.

Bacauanu V. (1968), Câmpia Moldovei. Studiu geomorfologic, Edit. Academiei, Bucuresti;

Bacauanu V. (1973), Evolutia vailor din Podisul Moldovenesc, în Realizari în geografia României, Ed. Stiintifica, Bucuresti.

Dimian M. (1968), Studii stratigrafice si tectonice în regiunea Lucina-Moldova Sulita-Breaza (Carpatii Orientali), Dari de seama ale sedintelor, vol. LV (1967-1968), 5.Tectonica siGeologie generala, Bucuresti, 1969.

Donisa I., Barbu N., Ionesi L. (1973), Etapele evolutiei retelei hidrografice în Carpatii Orientali, Realizari în geografia României, Edit. Stiintifica, Bucuresti.

Grasu C-tin, Miclaus Crina, Brânzila M., Bobos I. (2002), Sarmatianul din sistemul bazinelor de foreland ale Carpatilor Orientali, Edit. Tehnica, Bucuresti.

Macarovici Nec. (1964), Contributions a la connaissance du Sarmatien entre de la vallee du Siret et les Subcarpates, Analele stiintifice ale Univ. Al. I Cuza, seria noua, sect. II (Stiinte naturale), b. Geologie – Geografie, tom X, Iasi.

Martiniuc C.I. (1956), Cercetari geomorfologice în regiunea Baia-Suceava, Analele stiintifice ale univ. „Al. I Cuza“, sectiunea II – Stiintele naturii, - Geografie, Iasi, 1956.

Martiniuc C, Bacauanu V. (1960), Contributii la studiul geomorfological teritoriului orasului Suceava si al împrejurimilor sale, Analele stiintifice ale univ. „Al. I Cuza“, seria noua, sectiunea II – Stiintele naturii, tom VI, fascicol 4, Iasi.

Miclaus Crina (2001), Geologia deltelor relicte extracarpatice sarmatienedintre vaile Sucevei si Bistritei, Teza de doctorat, Univ. Al. I. Cuza Iasi.

Oprea D. (2001), Consideratii geomorfologice asupra bazinului hidrografic al râului Scheia, Analele Universitatii Stefan cel Mare Suceava, sectiunea Geografie, anul X.

Oprea-Gancevici D. (2008), Aspecte geomorfologice privind o posibila captare fluviala la obârsia râului Suceava, Analele Universitatii Stefan cel Mare Suceava, sectiunea Geografie, anul XVII.

Oprea-Gancevici D., Florea F. (2008), Asupra unor depozite psefito-psamitice din Podisul Sucevei – la nord de valea râului Moldova, Comunicari de Geografie, Bucuresti.

Popp N., Martiniuc C. (1971), Zona de contact între Carpatii Orientali si Podisul Sucevei, Sudii si comunicari, Stiinte naturale, nr.2, Muzeul judetean, Suceava.

Sîrcu I. (1955), Valea Siretului în sectorul raionului Pascani si problema genezei seii de la Ruginoasa, Aspecte geomorfologice., Probleme de geografie, vol. II, Bucuresti.

Sîrcu I. (1965), Terrasses fluviales, surfaces d’erosion local et pseudopeneplaines dans le nord du Tableland Moldave, Analele stiintifice ale univ. „Al. I Cuza“, seria noua, sectiunea II – Stiintele naturii, b. Geologie – geografie, tom XI, Iasi.

Tufescu V. (1932), Captari actuale între afluentii Prutului si ai Siretului, jud. Dorohoi. B.S.R.R.G., tom LI, Bucuresti.

Tufescu V. (1937), Dealul Mare-Holm (Observatii asupra evolutiei reliefului si a asezarilor omenesti), B.S.R.R.G., tomul LVI, Bucuresti.

Tufescu V. (1985), Continuitatea pietrisurilor carpatice prin saua de la Bucecea, Studii si cercetari de Geologie, Geofizica si Geografie, seria Geografie, tom. XXXII, Bucuresti.