Bertrabnunatakker

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Coordinates: 77 ° 52 ′ 0 ″  S , 34 ° 38 ′ 0 ″  W.

Relief Map: Antarctica
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Bertrabnunatakker​
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Antarctic

Bertrabnunatakker (formerly Bertrab-Nunataks ) is the name for three flat rock ridges on the coast of Prinzregent-Luitpold-Land in Antarctica that protrude from the inland ice .

Discovery and geographic location

The Nunatakker were discovered in January 1912 by the second German Antarctic expedition under Wilhelm Filchner and named after Lieutenant General Hermann Karl Josef Wilhelm von Bertrab (1857–1940), who was then head of the trigonometric department of the Prussian land survey . Besides the Moltke and Littlewood Nunatakkern , these were the only ice-free regions that were sighted by this expedition.

They are located at 250 m above sea level, about 18 km inland from Vahsel Bay on the southeast coast of the Weddell Sea . Immediately north of the Nunatakker, the Lerchenfeld Glacier flows into the Vahsel Bay.

geology

The Nunatakker consist of horizontally stored quartz porphyries , which were formed by volcanic activity about 1110 mya . These are penetrated by several mafic and rocky tunnels up to 5 m thick . Since they were formed, these rocks have not been altered by ore formation processes, whereas the rocks in the nearest ice-free mountains ( Shackleton Range 300 km in the southeast, Heimefrontfjella 800 km in the northwest) were folded and highly metamorphic overprinted before 550 mya when the continent Gondwana was formed. According to the current state of research, the Bertrab, Littlewood and Moltke Nunatakker are the only outcrops of an otherwise completely ice-covered microcontinent that was attached to Antarctica when Gondwana was formed.

Research stations

Argentina opened the label summer station on the southernmost Nunatak in 1970 . This station was expanded in 1979 and converted into a year-round manned station and has been called the Belgrano II station ever since .

literature

  • Georg Kleinschmidt , Steven D. Boger: The Bertrab, Littlewood and Moltke Nunataks of Prinz-Regent-Luitpold-Land (Coats Land) - Enigma of East Antarctic Geology . In: Polar Research . tape 78 , no. 3 , 2008, ISSN  0032-2490 , p. 95-104 ( awi.de [PDF; 5.2 MB ]).

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