Admin Warum bildet sich ein Grabenbruch in der Mitte der mittelozeanischen Rücken?
In der Mitte der mittelozeanischen Rücken bildet sich ein Grabenbruch (Rift). Begründe. Beim Zusammentreffen von ozeanischer und kontinentaler Kruste taucht die schwe- rere ozeanische Kruste unter die kontinenta- le Kruste ab. Durch das Abtauchen der oze- anischen Kruste entsteht ein Tiefseegraben.
Wie entsteht ein ozeanischer Rücken?
Dort, wo kontinentale Kruste auseinanderbricht, entsteht ein Grabenbruch. Wo sich dagegen ozeanische Krustenstücke voneinander wegbewegen, wachsen am Meeresboden Gebirge: die Mittelozeanischen Rücken. Sie bestehen aus Magma, das aus dem Erdmantel durch die ozeanische Kruste nach oben dringt.
What are rift zones in geology?
INTRODUCTION The rift zones are regions of stretching where the crust is somewhat thinned and the mantle has lower than normal density. The most distinctive form of rift is a relatively narrow, often step faulted graben with deep normal faults and uplifted margins.
Is the basin and Range Province a continental rift zone?
Modified from “Beauty from the Beast: Plate Tectonics and the Landscapes of the Pacific Northwest,” by Robert J. Lillie, Wells Creek Publishers, 92 pp., 2015, www.amazon.com/dp/1512211893. The topography of the Basin and Range Province and Rio Grande Rift reveals the full range of characteristics of a continental rift zone.
What are the characteristics of continental rifts?
Thus a second characteristic of continental rifts is that their valleys contain most of the deepest lakes in the world. These include the world’s deepest, Lake Baikal in Siberia (5,387 feet; 1,642 meters deep) and the 2nd and 4th deepest, Lake Tanganyika (4,323 feet; 1,318 meters) and Lake Malawi (2,316 feet; 706 meters), in the East African Rift.
How are lakes formed in continental rift zones?
Lakes pond against active fault escarpments where one side of a rift valley moves downward faster than the other. National Park Service sites in continental rift zones reveal long mountain ranges separated by deep valleys (basins) that are partially filled with sedimentary and volcanic material.