Geological highlights in South-Algeria    

(2007)
 


Start from the camp in Tamanrasset


The driver crew



First basalt columns on the way to the Hoggar mountains



Overturned basalt columns



Guelta with granites above the Precambrian basement



Basaltic lava-field in the same guelta



Beautiful basalt columns nearby the Assekrem summit



Panorama view from top of the Assekrem



An unexpected coincidence



High noon; temperature under the tree: 35C



Geological meeting



New drinking water reserves





Granitic ring-pluton Tilhaliouine (23 18' N / 4 43' E)



Inside of Tilhaliouine



Granite wall of the Tilhaliouine



 On the way: Outcrop of methamorphic Precambrian sediments



Methamorphic Precambrian sediments



Outcrop of Precambrian marble



Ouksem -- a young explosive double-crater  (23 55' N / 5 49' E)
The eruption had imbued through a old granitic dome



The northern part of Ouksem with a soda-lake



The southern part of Ouksem with granitic walls



Typical ash-layers on the crater rim







First Tassili-sandstone on Precambrian basement



Paleozoic Tassili-sandstone with fluvial cross-bedding





Satellite-image from the outcrop of Precambrian marble, quartzite and amphibolite



The same strip on the bottom



Outcrop of Precambrian marble in this strip



Position: 22 55' 36" N / 7 33' 26" E



Again an outcrop of beautiful Precambrian marble



Position: 22 43' 11" N / 8 21' 09" E



 



Granitic ring-pluton Tin Eroras (23 43' N/ 8 30' E)



Inside the ring-pluton Tin Eroras



with contact-methamorhic sandstones on top



Isolated outcrop of cross-bedded Tassili sandstones



with ripple marks



The large Tassili plateau at the horizon



The Tassili plateau



Enormous walls of sandstones



 



The discordance between Precambrian basement and Paleozoic Tassili-sandstone



Detail



The geological tour is finished



in the Oasis Djanet