收 a grain of garnet in a garnet-biotite gneiss, the small inclusions are relicts from early assemblage formed under p-Tconditions different from those that formed the gneiss
A grain of garnet in a garnet-biotite gneiss, the small inclusions are relicts from early assemblage formed under P-T conditions different from those that formed the gneiss
Temperature A ETROGRADE C P-T path for a body of rock undergoing metamorphism along a subduction zone
P-T path for a body of rock undergoing metamorphism along a subduction zone
Temperature And Pressure(2) Low-grade metamorphism is the result of metamorphic processes that occur at temperatures from about 100oc to 500oC and at relatively low pressures. High-grade metamorphism is the result of metamorphic processes at high temperatures(above 500C), and at high p ressure
Temperature And Pressure (2) ◼ Low-grade metamorphism is the result of metamorphic processes that occur at temperatures from about 100oC to 500oC, and at relatively low pressures. ◼ High-grade metamorphism is the result of metamorphic processes at high temperatures (above 500oC), and at high pressure
Region of Temperature(C diagenesis 200 400 600 Region of tow-grade 2000 amorphism Continental crust 4000 Increasi 15E grade of 200° C metamorphism 6000 metamorphism 400°C 3 8000Pressure and conditions 600°C o 10,000in the crust not found 800C Melting starts 12000 Mantle The metamorphic grade
The metamorphic grade
Stress Stress is applied pressure that results in deformation in a solid, and the development of new textures a Uniform stress occurs if pressure is equal in all directions Differential stress occurs if pressure is different in different directions a Texture is controlled by differential versus uniform stress
Stress ◼ Stress is applied pressure that results in deformation in a solid, and the development of new textures. ◼ Uniform stress occurs if pressure is equal in all directions. ◼ Differential stress occurs if pressure is different in different directions. ◼ Texture is controlled by differential versus uniform stress