Environmental Engineering Reference
In-Depth Information
Figure 10.5
Rift formation and development. Thermal
doming or diapirism (a) causes crustal extension and graben
formation (b). Continuing subsidence of new, denser basaltic
crust leads eventually to marine flooding and the birth of a
new ocean (c). Asymmetrical extension frequently leads to
basin-range structures (d) with terrestrial sediments (shown
hatched) collecting in graben. Faulting is indicated by split
arrows on downthrow side.
