Mount Dallmann
P1
The main massif of the Dallmannberge seen from the northeast.
The Dallmannberge ( norweg. Dallmannfjellet ) in Dronning Maud Land consist of a group ice-free rocky peaks and nunataks on an area of approximately 250 km ². Was named the mountain after Eduard Dallmann, the captain of the steamer " Greenland ", explored the 1873/74 whale and seal stocks in the Antarctic.
In January 1939, the ice-free mountain region was discovered at the German Antarctic Expedition flights 1938/39, and documented with the aid of aerial photographs. Since most aerial photographs during the Second World War were lost, the mountain was again taken photogrammetrically during the Norwegian Antarctic Expedition 1956-1960 and calibrated also control points on the ground for a more precise orientation. The first geological research took place within the framework of the 4th Soviet Antarctic Expedition 1958-1960. The systematic geological mapping and exploration was continued by the GeoMaud 1995-1996 expedition.
Geography
The mountain consists of two geomorphological different areas. The western part is formed by a to 2486 m high, compact massif with a wide, open to the north Kar. The eastern part, through a glaciated valley ( Slabotnen ) separated from the main massif is a north-south direction extending, strongly indented ridge that bears the name Småskeidrista. At its southern end is the Mörkenatten, the highest with 2515 m elevation of the mountain. To the north of the crest is lowered to 1590 m and only protrudes in the form of individual nunataks of the ice out. To the west and east of the mountain range is limited by wide glacier; the Glopeken in the west separates the Dallmannberge from Conrad mountains, in the east of Somoveken the border to the Alexander -von- Humboldt Mountains. Both glaciers unite on the northern foothills of the mountains and flow out to the Lazarev Ice Shelf.
Geology
The mountain consists of highly metamorphosed, multiply folded gneisses, amphibolites and marbles, whose output rocks volcanic and sedimentary rocks are of an island arc with mesoproterozoischem age. At the turn Mesoproterozoikum / Neoproterozoic these rocks were in the collision of the island arc with the Kalahari craton first overprinted deformed and metamorphosed. Another deformation went through the rocks in the collision of West and East Gondwana about 540 mya, with the current Faltenbau arose. Since the Ordovician is subject to the mountain of the ablation.