geographia - Studia

I. MAC, N. HODOR, MARIA HOSU
The regressing environmental states (environmental decline) get installed through:
− natural phenomena as clinotrop processes (land collapses or slumps, debris
flows), overmoisturing, floodings, gully erosion etc.;
− mining activities, pits exploitations, overgrazing, unproper agricultural practices etc.
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5. CONCLUSIONS
The interpretation of the „environmental memories” in this geomorphologic
system, led us to the following conclusions:
− Oaş Mountains are described, in general, by a palimpsestic character within
which structures and forms (from the relict to the actual ones) testify the succession of the
various temporal-spatial states;
− the system’s increased sensitivity might be explained by the permanent perturbations
under the continuous inputs of mass, energy and information (polycyclic volcanism,
marginal subsidences, pluvio-denudational and fluvial stress, human-induced stress etc);
− the specific nature of the structural and functional relations between elements
(volcanic, sedimentary, marine, fluvial), the rapports permeability/impermeability or biologic
activitiy /human-induced activity, contributed to a vulnerability state setting in and not to a
robustness one, as registered in the case of other mountainous systems with evident
complementary relations;
− the dysfunctions in this mountainous environment are both natural (geologic,
geomorphologic – land slides, river channel overcharges, erosion, gleisation, pedologic
processes etc.) and human-induced (material relocation by mining exploitations, constructions,
interventions in the fluvial or slope landforms, various types of pollution – physical,
chemical, thermic etc. -, space consumption for human purposes);
− a gradual establishment of a prevailing human-made environmental system, at
least on the holarchic level of the epi-environment (geofund – weathering cover, edafund –
soil, hydrofund – surface waters and biofund), is to be distinguished everywhere in the
geographic landscape of the Oaş Mountains.
The Oaş Mountains distinguish by an increased geo-structural and morphologic
variety and by landforms superpositions under the effect of the insertions of new structures
into the old volcanic ones.
A main characteristic is represented by the increased relief fragmentation induced
by the internal (tectono-volcanic) or external (especially of fluvio-denudational type) agents.
The relief’s general aspect and morphometry individualize three distinct
morphostructural units:
− the external unit, made of insular volcanic edifices (Jelejnic – 479 m, the hills of
Remetea, Dealul Mare, PleşcuŃa – 363 m and Dealul Viilor – 359 m, Oul peak – 356 m,
Tămăşeni hummock – 383 m, Măgura hummock – 328 m etc.), separated by gulf
depressions that communicate through gates or passes with the Oaş inner depression (plane,
with small volcanic bodies developed on fault lines and with marginal piedmonts and
glacises). The most eloquent examples in this respect are: Tur Gate, Talna Gate, the saddle
between Oraşu Nou and Oraşu Nou – Vii;
− the central ridge, characterized by the presence of complex, twinned or
superposed structures, stratovulcanos, lava cones, exposed subvolcanic bodies (Frasinul
Mare – 643 m, Pietroasa – 587 m, CetăŃeaua Mică – 518 m, CetăŃeaua Mare – 553 m) etc.