The Dependence of Relief on Tectonics in the South-West Escarpment Zone Oftomaszowskie Roztocze (SE Poland)
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Landform Analysis, vo!. 3: 13-24 (2002) The dependence of relief on tectonics in the South-West Escarpment Zone ofTomaszowskie Roztocze (SE Poland) Teresa Brzezinska-W6jcik Zaklad Geografi; Regionalnej, hlStylllt Nauk 0 Ziem; UMCS. "I. Akademicka 19, 20-033 Lublin c·mail: [email protected] Abstract: The relatively undeformed South-West escarpment zone (SWEZ) ofRo7.toczc. SE Poland, ismarginal to the East European Platfonn, which is covered by a thick succession of Palaeozoic and Mcsozoic rocks. Cain()7.oK: LA sedimenls, previously much more widely distributed and largely destroyed by erosion, still fill some valleys and also crop out in the hills ofthe inner and outer escarpments. The escarpment zone comprises severnl morphological --- c:!ements: an OUler hill zone, inner inselbergs and a median depression lone of teclonic origin. Transverse 10 tbe escarpment, these elements arc compartmcntaliscd by transverse valleys. many of which are fauh-control1ed. Morphometric and geomorphological studies show that thc SWEZ ofRoZloczc was repeatedly leclonically activated. NCOletlonie redevelopmenl has resulted from controls in the underlying basement. Hence there arc IUany young faulls, a large numtx.T ofopen faull-fissures and a complex system ofjoints, all ofwhich have influenced landform developmenl in this area 10 a eon.~iderab1c: degree. The main scarps have been developed along the longitudinal fRUlt zones and. along the transverse fault 7.ones, breach valleys. Joint systems have controlled the development of sl:condary relief forms. The close association of relief and various elements of the geological struClure in the SWEZ of Roztoc1.e mean that canol,'f3phic methods can reliably be employed in studil;:s oflhe landfonns in this area. Key words: geology, geomorphology, tectonil:S, relief, Roztocze Introduction Tamowola, Pardysowka and Nowiny (280 m a.s.l.) are delimiled by a group of SW-throwing border The SWEZ of Rozlocze is marginal to the East faults and by antithctic Ihrust faults to thc North European Platfonn and lics within the Radom-Krasnik East (Jaroszewski, 1977). Thesc hills have Sleep Elevation, a structural unit ofthe Palacozoic bascment southern slopes and gentle northcrn slopes. (Zclichowski, 1974; 1983). Thc Palaeozoic rocks are According to Jabn (1956), their northern inclination covered by a lithologically-variablc succession of is caused by recent teclonic tilling. JaJOszewski Mesozoic sedimcnls.ln the Cimmerian and Laramian (1977) considered lhat Ihe antilhetic rotation of phases, the sedimentary pile was defonned into gentle individual blocks was due 10 tectonic extension. teclonic StnlClUrCS which follow prc-exisling elements Padol Jozcfowa is a second-order tectonic trough of horsl and graben (Ney. 1969; Pozaryski, 1974; developed in a zooe ofthrusts which accompany the Cieslinski et al., 1994). Miocene sediments, once border faults. Between Tereszpo1, Gomiki Nowe and widespread but now largely removed by erosion, arc Narol, the outer inselberg hills (310-320 m a.s.l.) stiU preserved along the foothills, where they form a are situated in the zone of the Tereszpol-Majdan zone of narrow, extended periclines (Aren, 1962; Ncpryski-Narol border faults. 10 lhis respeCl, they 1968). resemble lhose of the inncr edge. These hills, The escarpment zone comprises threc parallel confined to a structural trough to the Soulh·West of morphological elements: a zone of outer hills and Padol J6zcfowa (270-280 m a.s.I.), are arrangcd in inncr inselbergs separated by a zone of tectonic two parallel chains fonned by separatc semicircular depressions (Fig. 1). The asymmclric outer hills of ridges. 13 Teresa Brzezinska-W6jcik The dependence ofrelief on tectonics in the South-West Escarpment Zone... matian clays and mudstones with sandy bands (Krakowieckie loarns) occur below -------zwl<1~ the scarp (Le. just within the Carpathiao ,Km' _omC' , Forcdeep Basin) (Aren, 1962; Musial, _Km} 1987; Ciesliilski et al., 1994). - The intra-Miocene movements oc curred in two slages: Middle Badenian and late Sarmmian. In the Bade!1ian, ma rine LithOlhamnium limestones and sands werc depositcd along the contemporary inncr edge of tbe SWEZ. Later move ments led to the development of regular step faults, the intervening blocks of which were antithetically rotated. Sedi "'". - mentation ofthe biogenic limestones took place on the slTUctural benches formed in -~ - --- this way but the sandy and Lithothamnj lilll-detrital scdimcnts accumulated in Cl --~ -........----" __of__ lagoons and bays. In the Sarmatian, sed ..~ J. Btnc:zyNIrl(ttl1): ...... - [...--'1 imentation was accompanied by tecton ic movements. The crustaI stress field ... o _JtricM... - probably had a large honzomal compo -- .".. 1 ,.u.. .",;I"*'Yp.u..dllQtlOmt.-M~ ....ig."-I. Localioo of South·Wesl Escarpment Zone ofTomaszowskic Roztoczc 1 nent at times, which is why the field was .K.. ",.".,OIltCt/I4I.aI_~"-"-/ltln reoriented. This Icd to the development _ ...1 ",.".,lIl"JOQ' ¥Id __d top ~ MMWieItIl... Geological setting ofdip-slip transverse faults. Also, older nomlal faults _"..1 ...."._~~ld_U"".,MM_i:ln became redevelopcd as thrusts. Rejuvenation of the ~ "'NalL.o_C'~ The SWEZ corresponds to an importanl geologi fault steps and both longitudinal and transverse ~ l¥IO'<..,IId,>UN aI Upper e-.u" cal boundary which is often regarded as the edge of troughs gradually led to a relatively large-scale deniv o "'ucI_,.IOd~dS-_ tbc Carpathian Foredeep Basin. According to Ney elation in the escarpment zone ofthe Carpatbian Fore _ .'me_,..1/IdI _UIId._.ofa-"",,, (1969), Jaroszewski (i974) and Zelichowski (1974) deep Basin. For some lime afterwards, the SWEZ 1-::::=1 _ llId ~ fl~1fI in",. conop/I. oIlo4&.ozoI<: , CaillOZoI<: rodll it was fomlcd along the deep-scatcd thrust zone which along the present inner scarp of Roztocze was tec 1-"'11 "'''lgflplW; bo<JlId.riN ,~ marks the south-west edgc of tbe East European tonically controlled. A zone ofbarrier accumulation o, •, , Platform (Figs. I, 2). The most recent geological in ofproducts ofsediment destruction was situated along vestigations in the area of the Carpalhian Foredeep tbe fault scarp ofthe outer edge. This line represents Fig. Z. Geology (without Quaternary deposits) (aRcr Jaroszcwski, 1977; Cid1inski, Kubica, Rzechowski, 1994; Kurkowski, 1994; Basin adjacent to Roztocze (Krzywicc & Pielch, 1996; a marked transition from the movements in the Car Popiclski.I994) Oszczypko, 1996; Knywiec & Jochym, 1997) indi pathian Foredeep Basin and tbose of the Roztocze cate that the SWEZ was fomled in very complex (Jaroszewski, 1977; Krzywiec & Pietch, 1996). Ac changes in the development of river beds as well as evident. The variable relief and inselberg-Iike char tectonic conditions. Its formation started in the Mid cording to Baraniecka (1983), tectonic activity in the in their character and the variable thicknesses of al acter ofthe hills are associated with an uneven eleva dle Badenian when a rapid, spatially-differentiated Quaternary was particularly intensive at the end of luvia are all clear evidence for contemporary tecton tion of escarpment zone blocks and a variable subsidence occurred; this was the result ofextension Otwock glaciation (Eburonian, Eopleislocene-Lind icactivity (Buraclytlski, 1980/1981; 1984). A distinct erosional resistance of the Mioceoe rocks (Jarosze in the Carpathian Foredeep. Several synsedimentary ner et al., 1998) and the beginning ofthe Celestyn6w differentiation of spatial vertical movements is still wski, 1977; 1994; Buraezynski, 1980/1981). PadO! faults were created by these movements. The last stage interglacial (Waalian, Eopleistocene), during the evident in this zone (Brzeziliska-W6jcik, 1995; 1996; J6zefowa was formed in the Badenian as a secondaJy ofthe development ofthe zone was represented by a Narcw glaciation (Menapian) and the Ferdynand6w I997b). tectonic unit in the antithetical thrust fault lone, which latc Sarmatian (Serravalian) inversion of the normal interglacial (Cromerian complex - interstadial Ill-IV, The escarpment zone is compartmentalised by follows the main border fault ofthe Carpathian Fore faults in a compressional regime, which was produced Elstcnan) as well as at the beginning of the Maso transverse valleys which have been hollowed out deep Basin. In the Sarmatian, this trougb was cut by by the latest stage of movements in the Carpathian vian interglacial (Holsteinian s.s.). According to RUhle along transverse and longitudinal faults, in teetoruc transverse faults during a phase of East Carpathian tectogene. (1976), in the copleistocene and the Holocene, the troughs (Figs. 2, 3). The outer hills of Pardys6wka movements. The J6zef6w and G6rnik:i Nowe faults The SWEZ is built from Lower Campanian and Roztocze undeT\\'ent vertical movements ofamplitude and Nowiny, Pad61 J6zefowa and the inner hills near are two examples ofthis. The wide gap in the zone of Maestricbtian carbonate rods in a gaize or maTly from +50 m to +100 m. Wyrzykowski (1971) and G6miki Nowe, G6rccko Stare and Majdan Nepryski the outer hills near PardysOwka is a result ofthis trans gaize fades. The sediments are arranged into broad Kowalski & Liszkowski (1972) calculated that con are lhosc areas where teeloruc control ofreliefis most verse fault activity (Jaroszewski, 1977) (Fig. 3). fold structures ofsmall amplitude (Fig. 2) (Ciciliiiski tcrnporary vertical movements in the escarpment zone et aJ., 1994). Miocene deposits (mainly reef, organ<r arc ofthe order of I mm a year.