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Structural Development of Maglevandsfald: a Key to Understanding the Glaciotectonic Architecture of Møns Klint, SE Denmark

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Structural Development of Maglevandsfald: a Key to Understanding the Glaciotectonic Architecture of Møns Klint, SE Denmark ROSA_2008:ROSA-2008 01/07/09 15:48 Side 29 Structural development of Maglevandsfald: a key to understanding the glaciotectonic architecture of Møns Klint, SE Denmark Stig A. Schack Pedersen and Peter Gravesen The Møns Klint Glaciotectonic Complex (Fig. 1) exposed in the N–S-trending chalk cliff on the east coast of the island of Geological setting of Møns Klint Møn in south-east Denmark is one of the most famous glacio- The Cretaceous chalk represents the oldest bedrock affected by tectonic geosites in the world. People of all nationalities are glaciotectonic thrusting in Denmark. The chalk consists of a attracted to the site, which has more than 300 000 visitors per fine-grained matrix of coccoliths and remains from invertebrates year. Many of them may not realise the uniqueness of the (Surlyk & Håkansson 1999). The chalk at Møn is correlated glaciotectonic framework, and are probably more fascinated by with the upper part of the Tor Formation in the North Sea and the spectacular view of the white cliff and chalk peaks sepa- the Danish Basin (Surlyk et al. 2003). rated by the deep green gorges. However, without the glacio- An erosional unconformity on top of the chalk represents a tectonic deformation the cliffs would never have formed. hiatus of about 60 million years. Due to erosion, the unconfor- Instead the Cretaceous chalk would still have been resting mity is found at gradually lower and lower levels towards the horizontally below the seabed, covered by glaciofluvial sand, southern part of the cliff, which indicates that the pre-Qua- gla ciolacustrine clay and clayey till. ternary relief probably contributed to the formation of glacio- In the summer 2007, a new natural science exhibition cen- tectonics in the area. In some parts of Møn the pre-Qua ternary tre, GeoCenter Møns Klint, was opened. The exhibition fo - unconformity is overlain by a Saalian till, marine Eemian clay cuses on the geology of Denmark with special reference to the and three Weichselian tills intercalated by glaciolacustrine and chalk cliffs of Møns Klint. Prior to the decision to build the glaciofluvial deposits (Houmark-Nielsen 1994). However, at centre, the Geological Survey of Denmark and Greenland was Møns Klint an old Weichselian till is the oldest Quaternary asked to provide an evaluation of the landslide risk for the site, deposit recognised at present (Pedersen & Gravesen 2006). This because landslides regularly occur along the cliff section (Pe - till is a grey and reddish sandy till that grades up into a gravelly, dersen 2003). A detailed structural analysis was consequently stone-rich top surface indicating terrestrial conditions. We tenta - carried out at the planned site of the centre just above the tively correlate this unit with the Ristinge Klint Till (Houmark- Maglevandsfald gorge (Fig. 1). During this investigation it Nielsen 1987, 1994), which was deposited by a Baltic ice stream became obvious that understanding the glaciotectonic frame- in the early part of the Weichselian (c. 60 000 years BP) from a work was a prerequisite for the geological risk analysis. Thus source area in the Baltic Sea. When the Baltic Ice Stream melted the structural details at Maglevandsfald became a key point for back the depression became occupied by a huge lake, in which the glaciotectonic model of Møns Klint which we present in dark glaciolacustrine mud rich in dropstones was deposited this paper. (Houmark-Nielsen 1994; Houmark-Nielsen & Kjær 2003). Maglevandsfald Dronningestolen Fig. 1. Aerial photograph of Møns Klint. The highest cliff in the centre is Dronningestolen. To the left the Maglevandsfald gorge leads GeoCentre from the location of GeoCenter Møns Klint down to the beach. At the left side of Dron- ningestolen a wedge-shaped structure is seen (red arrow), which was formed in the first deformation phase of the glaciotectonic complex. The thrust structures to the right of Dronningestolen were thrust to the SW during the last deformation phase. The location of Møns Klint is shown on the inset map of Denmark. © GEUS, 2009. Geological Survey of Denmark and Greenland Bulletin 17, 29–32. Available at: www.geus.dk/publications/bull 29 ROSA_2008:ROSA-2008 01/07/09 15:48 Side 30 N thrust chalk sheet, was positioned (Fig. 4). In addition, a borehole was drilled to investigate whether karst cavities or an unforeseen thrust-fault zone with dip towards the cliff and beach were present. If a fault zone exists below the location it could be a candidate for a landslip similar to the one that S destroyed the Store Taler chalk peak in January 2007 (Fig. 5). m 100 The borehole was placed on top of the cliff 100 m above sea level close to the old Hotel Store Klint (Fig. 6). The upper- Sea level m 100 most 16.3 m consist of glacial sediments resting upon the chalk unconformally. The oldest unit in the glacial succession is a 1 m thick till that is correlated with the Ristinge Klint Till. This formation is overlain by 2.3 m glaciolacustrine Glaciofluvial sand Ristinge Klint Till mud, which grades into the nearly 2 m thick Mid Danish Mid Danish Till Maastrichtian chalk Glaciolacustrine clay Thrust fault Till. A 7.7 m thick unit of glaciofluvial sand and gravel over- lies the Mid Danish Till; the upper part of the glacial succes- Fig. 2. Stratigraphical and structural framework of the southern imbricate fan at Møns Klint. The thickness of the lithological units is variable, and sion is a 3.5 m thick, sandy till that was deposited by the especially the glaciofluvial sand above the Mid Danish Till increases in Young Baltic Ice. Below the unconformity the drilling pene- thickness, where the sand was deposited in piggyback basins during the trated 48 m of Cretaceous chalk, after which the drilling was thrust-fault deformation. From Pedersen & Gravesen (2006). Imbricate fan The unit is informally called the elephant clay due to its charac- teristic erosion features. At the Late Weichselian glacial maxi- mum the Swedish Ice advanced over the eastern part of the Danish Basin onto the Main Stationary Line depositing the Mid Antiformal Danish Till on Møn (Fig. 2; Houmark-Nielsen 1987; Pedersen stack & Gravesen 2006). At about 18 000 years BP the Young Baltic Ice Stream Ramp reached Møn (Houmark-Nielsen & Kjær 2003). The pressure Slotsgavle foreland from the ice was directed away from the central axis of the ice thrust stream towards both north and south, where it thrust up the Dronningestolen chalk sheets at Møns Klint. The glaciotectonic structures at antiformal stack Møns Klint can be divided into three architectural elements. In Maglevandsfald the southern part the thrust sheets form an imbricate fan with ramp thrust faults striking E–W, in the central part the structures form an antiformal stack, and farthest to the north the thrust sheets Gråryg imbricate dip gently to the south in the foreland regime of the thrust defor- mation (Fig. 3; Pedersen 2000). Towards the end of the Weich - SSE Yo ung Baltic selian the Scandinavian ice sheet melted back. However, a ice advance re advance from southern Sweden reached Møn from east- ENE north-east at a time between 17 000 and 15 000 years BP, Jydelejet superimposed which was responsible for superimposed deformation of the thrusting glaciotectonic complex (Pedersen 2000). Fig. 3. Principal structural framework of the Møns Klint Glaciotectonic Complex. Blue: chalk; brown and orange: Quaternary deposits. Red lines Photogrammetric mapping and a borehole outline the thrust faults. To the south the E–W-trending ridges represent investigation an imbricate fan, and in the central part an antiformal stack is responsi- ble for the formation of Dronningestolen. Two principal sketches of the A 3-D terrain model of the area was developed for the risk structures are shown in the top left corner. In the distal part of the com- evaluation. The data for the model were provided by a photo - plex to the north a gently dipping imbricate fan was formed in the near- grammetric survey and a digital model was constructed, in foreland regime. The structures from the distal regime to Maglevandsfald which the trace of the glacial deposits, interbedded between were strongly affected by superimposed deformation caused by a re - the unconformity on top of the chalk and the base of an over- advance of ice from Skåne. After Pedersen (2000). 30 ROSA_2008:ROSA-2008 01/07/09 15:48 Side 31 Steps to the beach DGU 228.84 100 m a.s.l. Glacial succession N Fig. 5. The landslide at Store Taler took place at the end of January 2007. A volume of more than 100 000 m3 was displaced along an inherited Fig. 4. 3-D model of the Maglevandsfald gorge. The position of the ex - thrust-fault surface formed during the last phase of deformation at Møns ploratory borehole DGU 228.84 is indicated with a dot, located be tween Klint. Store Taler is located in the northern part of Møns Klint. the exhibition centre and the old hotel. The upper and lower bound aries of the glacial succession are shown with a brown line. Contour interval 10 m. magnitude, probably about 75 m below sea level. Therefore the chalk below the lower glacial unit is also interpreted as a unfortunately stopped for logistic reasons. It would have thrust sheet lifted up from the décollement zone. been perfect if the borehole had reached the level of the lower The lower glacial unit is folded in a SW-verging over- thrust fault and the underlying glacial succession. However, turned structure, which has been deformed by the second the data demonstrate that neither a karst cavity nor an east- glaciotectonic event.
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