Page 42 - Whole Earth Geophysics An Introductory Textbook For Geologists And Geophysicists

Lines of volcanoes may Zone Rift Continental a) movement of a lithospheric plate over a hotspot, originating from a Normal Faults material deep within the : Basin Ocean New b) Red Sea Gulf of California Water Seaiments. Post-Rift the thinning elevation crust of the (German grabens basins; region of Ocean Atlantic Basin Ocean Advanced c) portions of Boundary Plate the the rifting are

2.12 stretches, high to part ridges “graben”), The they subside, forming A 2.14a). and thus called (Fig. 2.9). : oan as thin mid-ocean ridge
FIGURE be due to the plume of hot mantle. it raised upper elevated (Fig. Nevada Mexico, is continental lithosphere

apart is buoyant. The and (German as ranges of all of active Rifts (Moho) and lithosphere/asthenosphere lithospheric thicknesses on lithosphere at

pulls Tegion earthquakes valleys mountain comprising Mexico, and East African ee Asthenosphere Elevated Region Crust and entire
continent 2.13b). The and hot is volcanic strata as areas Other the Asthenosphere Newly-formed continental crust.

i a causing down-dropped and high America, and s = level. (b)
As (Fig. fashion, remain Oregon, California, Arizona, New (Fig. 2.15). Europe boundaries elevate. (c)
Tectonics Zones lithosphere underlying asthenosphere brittle by of sedimentary blocks North in Province = 35k; 2 150 km +5 km—— ee ae Topography, crust/mantle boundary boundary at divergent plate boundaries. (a) Typical crustal and thickness of typical

Plate Continental Rift entire cold, “horst”), separated to 8 km mountains Range Basin of central © # continental craton, with topography near sea three 1/6 the about

Chapter2 and crust because the deforms in a word up with adjacent horst the block fault Idaho, Utah, and Basin Pannonian a) Normal Continental Lithosphere Continental Rift Zone Mid-Ocean Ridge FIGURE 2.13 rifts apart; all continent contains crust

24 fill . b) co) be he 2