the power of global metamorphism glynis jehle neil swanson n.
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The Power of Global Metamorphism Glynis Jehle, Neil Swanson. Oceanic Spreading Ridges. D H = 200.4 kJ/kg = 20,000 J/kg m/t =2 (sides of ridge)* h * l * r * velocity Velocity = 5 x 10 -2 m /yr Height, h = 3 x 10 3 m (~half of ocean crust) Length, l = 8 x 10 8 m (world’s ridges)

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oceanic spreading ridges
Oceanic Spreading Ridges

DH = 200.4 kJ/kg = 20,000 J/kg

m/t=2 (sides of ridge)*h*l*r*velocity

Velocity = 5 x 10-2m/yr

Height, h = 3 x 103 m (~half of ocean crust)

Length, l = 8 x 108m (world’s ridges)

  • (of rock) = ~3g/cm3

Total = 4.8 x 1011 W

collision zones
Collision zones

DH = 200.4 J/g = 20,000 J/kg

P = (area*h*r*H)/t

Area of Himalayas and

Tibeten Plateau = ~30Gkm2

Height, h = 3.5 x 104m (amount of total thickness 70km being metamorphosed)

  • (of rock) = ~3g/cm3

Time, t = 40my/3 x 107 sec per year

Total = 5.3 x 1010 W

subduction
Subduction

DH = 200.4 J/g = 20,000 J/kg

m/t=h*l*r*velocity

Height = 100m sediment

Length = 5.5 x 107m (world’ssubduction zones)

  • (of rock) = ~3g/cm3

Velocity = 5 x 10-2m/yr

Total = 5.5 x 109 W

total energy of metamorphism
Total energy of Metamorphism
  • Oceanic spreading ridges = 4.8 x 1011 W
  • Collision zones = 5.3 x 1010 W
  • Subduction zones = 5.5 x 109 W
  • Total energentics of global metamorphism =

5.4 x 1011 W