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Evolution of Surfaces of Planation: Example of the Transdanubian Mountains, Western Hungary

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Evolution of Surfaces of Planation: Example of the Transdanubian Mountains, Western Hungary Geogr. Fis. Dinam. Quat. 21 (1998), 61-69, 5 Itss. 1 tab. EVOLUTION OF SURFACES OF PLANATION: EXAMPLE OF THE TRANSDANUBIAN MOUNTAINS, WESTERN HUNGARY ABSTRACT: PECSI M., Evolution of surfaces of planation: example of tut amente interessate da sollevamenti tett onici , subs idenza e stiramenti tbe Transdanubian Mou ntains, W estern Hungary. (IT ISSN 0391-9838, orizzontali. 1998). Secondo questo modello, 10 spianamento di tipo tropicale (etchplana­ tion) del tardo Mesozoico con la forma zione di paleocarso e di bauxite This model claims that the surfaces of planat ion I once produced by some erosional processes, were reshaped in the later geological period s by non continuo nelle Mont agne Transdanubiane. Com e conseguenza di una repeated , alterna ting erosional and accumulation processes on the rnor­ complessa subsidenza tett onica differenziata, la maggior parte dei rilievi ph ostructure also repeatedly affected by tectonic uplift , sub sidence and fu ricop erta in vari rnornenti da variamente spesse coltri sedimenrarie. II horizont al displacement. seppellirnento fu perc seguito da una totale 0 parz iale esumazione almeno According to this model , late Mesozoic tropical etchplanation with in tre momenti, nel Paleogene, nel Neoge ne e nel Quatern ario. Durante paleokarst and bauxite form ation did not continue during the Tertiary in questi avvenimenti la superficie di spianamento di tip o tropicale cretacea the Transdanubian Mountains of Hungary. As a consequence of multiple fu interessata da erosione 0 da sedimentazione attraverso processi non ti­ differenti al tectonic subsidence, most of the range was buried in various picamente tropic ali (quali la perip edim enta zione, la forma zione di terraz­ thickness and at various intervals. This burial was followed by complete zi marini, la messa in posto di mantelli alluvionali e altri ). Nelle serie degli or partial exhuma tion on at least three occasions (Paleogene, Neogene horst delle Montagne Transdanub iane, sepa rate da bacini tettonici tipo and Quatern ary). During repeated burial and exhum ation the Cretaceous graben, la posizione e l'evoluzione delle superfici consent e ilricon osci­ tropical etchplain was affected by further erosion or accumulation mento di alcuni morfotipi principali: through non-t ropi cal processes (such as peripedimentation, marine ter­ 1. supe rfici di spianamento (etchplain ) in posizione sommitale di horst race form ation , alluvial fan building and oth ers). In the horst series of the parzialment e esumati. Transdanubian Mount ains, divided by graben-like basins, the position 2. sup erfici di spianamento ietcbplain) in posizione tett on icamente solle­ and evolution of the geomor phological surfaces allows the identification vata di horst sepolti. of some main groups: 3. superfici di spianamento ietcbplain) di horst in posizione di soglia tet­ 1. (semi) exhumed horst of etchplanation in summit position; tonic a, sepolti 0 esum ati, e rimodellati, frequ entemente interessati da pro­ 2. buri ed horst of etchplanation in uplifted position; cessi di pedim entazione. 3. horst of etchplanation in thr eshold positi on, buried or exhumed and 4. superfici di spianamento ietchplainssepolte in corrispond enza di bacini. reshaped, mostly pedimented; 5. peripediment , pedim ent in roccia , localmente sepolti da copertura 4. buried etchplain in basin position; detritica. 5. perip edim ents , rock pediments, locally buried under detritus. II modello dell'evoluzione delle superfici geomorfiche att raverso pro­ The model of geomorphic surface evolution through alternating ero­ cessi alternati di erosione e sedimentazione puo non soltanto essere appli­ sion/accumulation does not only apply to the Hungarian medium-height cato alle Monta gne di media altezza dell'Ungheria, rna anche a molte altre mountains, but also to num erous oth er geomorphological regions, egothe regioni, quali le catene Alpin e, Carpatiche e Din arich e, a molte vecchie Alpine-Carpathian-Dinaric Mounta ins, several old mountains Jnd massifs mont agne e massicci dell'Europ a e degli altri continent i. of Europe and other continents. TERMINICHIAVE: Tardo Mesozoico,Superficie di planazione, Seppel­ KEY W ORDS:Late Mesozoic, Surface of planation , Burial, Exhum a­ limento, Esumazione , Sup erfici policicliche. tion, Polycyclic surfaces. RIASSUNTO: PECSI M., Evoluzione delle superfici di spianamento: l'e­ INTRODUCTION sempio delle Montagne Transdanubiane, Ungheria Occidentale. (IT ISSN 039 1-9838, 1998). The term geomorphological sur/aces denotes plains and II modello ritiene che le superfici di spianamento , gia prodott e da va­ ri processi erosivi, vengano rimodellate in piu tardi periodi geologici da gently sloping slopes, which are the products of erosion, of ripetuti , altern i processi di erosione ed accumulo su morfostrutture ripe- accumulation or of their combination, under the influence of tectonic processes. Their formation may be dated from their correlative sediments or by other methods. (,0,) Geographical Research Institute, Hungarian Academy ofSciences, For the timing of successive formation of landforms, P.o.B. 64 H-1388 Budapest, Hungary. i.e. for a reconstruction of the denudational chronology, an 61 interpretation of the different geomorphological surfaces is geomorphological surfaces are the oldest, the lower ones needed. Several models were proposed for the develop­ are ever younger. Such presumptions might only be valid ment of erosional surfaces (landforms) on great continental for a part of the cases and for some geological times. Pre­ morphostructures. Some of these have become classic (Da­ sumably the planation surfaces (models 1 to 5), explained vis, 1906, 1922; Penck, 1924; King, 1949, 1962; Biidel, by different processes, might be attributed to effects of as 1957 and his followers , Bulla, 1958; Bremer, 1986). many different geographical environments. If this is true, 1. According to Davis, the peneplain (ultimate peneplain) is the final each of these models and conceptions generally represent product of fluvial erosion on different humid regions. The almost plane genetically and climatologically different morphofacies sur/ace is the penultimate ph ase of the planation at the base level ", rather than one single, global type of surface. It must be 2. Penck's Primarrumpf (primary peneplain) J is a plain surface just emerged above the sea level. Piedmonttreppen (piedmont benchlands) are mentioned that these early models of planation surfaces explained by fluvial erosion and retre at of valley sides. Erosional surfaces were based on fixist tectonism. on slowly but uniformly elevating morphostructures may be explained In this presentation we want to introduce a polygenetic this way. model of geomorphological surface evolution, through 3. According to King, pediplanation also takes place by the retreat of slopes on slowly but continuously elevating terrains, especially under processes acting on different morphostructures affected by semiarid climates, where the rate of the mechanical weathering exceeds plate tectonic events, particularly in orogenic belts. The tha t of the chemical one. Retre at of slopes results in a gradual surface units studied were horizontally displaced over great dis­ lowering and pediplain form ation. According to King, pediplanation 4 is tances , tectonically dismembered, recurrently uplifted and the most widespread process reducing relief, this way it replaces Davis' pen eplain theory. subsided, thus the planation surface became repeatedly 4. Biidel proposes that the double etchplain s (doppelte Einebnungs­ buried, elevated and exhumed again (Pecsi, 1970a,b). Pol­ flache ) is an erosion surface created by intensive lateritic deep weathering ygenetic morphostructures with planation surfaces, which and strong wash down (stripping) of the thick weathered rock under a were shaped under the influence of alternating erosional seasonal dry and wet tropical climate. 5. A pediment is a gentle erosional foothill slope in front of a steep moun­ and depositional processes of long duration, were removed tain slope, generally formed of hard rock . Pedimentation is admitted to be from their original place and carried over long distances, the most general erosional, planation process. Mcgee, (1897) believes that passing under various climatic belts. This way units of a river, on leaving a mountain, deposits most of its load , while the rest of most different genesis might have come in each other's the sediment transported causes lateral planation (corrasion). The pedi­ ment is covered by a thin layer of sediment, deposited by sheetwash or by proximity. small rivers under a semiarid climate. The tectonic and geomorphic history of the Transda­ nubian Mountains (Western Hungary) was used as a mod­ Several researchers adhere to the above models for the el for the evolution of such polygenetic planation geomor­ origin of sur/aces 0/ planation, while others criticise or phological surfaces. Geological and geomorphological modify them. In one respect these models are uniform, studies of the last half century served as a basis of a new they suppose that the studied surfaces were formed during geomorphological evolutionary model, differing from the long geological times, when uplift was slow, continuous or previously mentioned ones (Pecsi, 1968, 1975, 1993; periodical. It is generally admitted that the highest situated Szekely, 1972). ~ Hungarian B k Mt Hungarian Gr~at Plain NW .-Little Plain ---f----- a 0 ny s SE Tel·2 Dudar FOle o -1000 ·- 2000 -3000 ----------"
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