Wie entsteht ein kontinentaler Grabenbruch?
Grabenbrüche entstehen, wenn die kontinentale Erdkruste durch verschiedene Ursachen gedehnt wird. Wie jedes relativ spröde Material kann die Kruste unter dieser Zugspannung brechen und nachgeben. Aktive Rifts entstehen über Manteldiapiren (engl.: mantle plumes) in von so genannten Hot Spots ausgedünnter Lithosphäre.
Wie heißen die Mittelozeanischen Rücken?
Mittelozeanischer Rücken, Spreizungsrücken, mid ocean ridge, spreading ridge, 1000-4000 km breiter, symmetrischer, submariner Rücken, der sich von den Tiefseeebenen in ca. 5 km Tiefe mit äußerst geringer Steigung auf ca. 2,5 km Wassertiefe erhebt.
What kind of magma is in the Rio Grande Rift?
The explosive volcanic activity that formed the giant crater (“caldera”) is due to silica-rich (granitic) magma formed as hot asthenosphere rises and melts crustal rocks along the Rio Grande Rift. NPS photo.
Where is the continental rift zone in the United States?
If the plate is capped by thick continental crust, the resulting continental rift zone rises high above sea level. The Basin and Range Province is thus a high-elevation region that includes all of Nevada and portions of Wyoming, Utah, California, and Arizona, and extends into southern Oregon, Idaho, and Montana.
How tall is the rift zone of a volcano?
Based on morphological data sets of seamounts and volcanic islands, Vogt and Smoot (1984) and Mitchell (2001) showed that the length of the rift zones is larger at volcanoes taller than 3 km ( Walter and Troll, 2003 ).
What are the characteristics of a continental rift?
The topography of the Basin and Range Province and Rio Grande Rift reveals the full range of characteristics of a continental rift zone. First, much of the region—particularly the northern portion—is well above sea level. There the whole landscape is moving upward, with the ranges rising a little faster than the adjacent basins.