The STUDIA UNIVERSITATIS BABEŞ-BOLYAI issue article summary

The summary of the selected article appears at the bottom of the page. In order to get back to the contents of the issue this article belongs to you have to access the link from the title. In order to see all the articles of the archive which have as author/co-author one of the authors mentioned below, you have to access the link from the author's name.

Geomorphologic Aggradation, Expression of the Climatic Changes -Situations and Structures Specific for Romania – Transylvania. The geomorphostructures, when defined as formations of accumulation with dynamic and grading organisation, are considered to be the expression of the factors involved in the dislocation, transport and redepositing processes. Geomorphologic sensitivity plays, in this case, an essential role. The formation, the increase or decrease of the morphostructures set up through aggradation or degradation phenomena, give hints about the changes of the factors responsible with the dislocation, transport and depositing. At the same time, the changes in grading, as well as those in the mineralogical composition and configuration of the morphostructures, illustrate the differentiation in time and space of the control variables actions. The study of some geomorphostructures in the Transylvanian Basin, such as alluvial beds, deposit fan structures (gullies, torrents), basal glacisses, lake sediments, evidentiated the role of the climate as a relief factor. As regarding the slopes, due to an accelerate erosion, an increase of the alluvial fans and of the basal glacises was noticed. The lake basins in the Transylvanian Plain are also characterized by an increase in the sedimentary deposits as a result of the inputs from the surrounding areas. On the whole, the morphostructures dimension, referring both to their volumes and geometry (configuration), is influenced by the various material inputs and by differences in the dynamic (transport) process (slopes and river beds), all these in the context of a general increase of the “dryness” (aridity) phenomenon. The rhythmgrams of the various sediments (lake, fluvial) clearly illustrate the sequence of the climatic manifestations, as well as the general trend towards heating and dryness (aridization).

Keywords: agradation, climatic changes, Romania, Transylvania