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The Power of Global Metamorphism Glynis Jehle, Neil Swanson

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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The Power of Global Metamorphism Glynis Jehle, Neil Swanson

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  1. The Power of Global MetamorphismGlynis Jehle, Neil Swanson

  2. 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

  3. 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

  4. 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

  5. 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

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