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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) - PowerPoint PPT Presentation
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The Power of Global MetamorphismGlynis Jehle, Neil Swanson
Oceanic Spreading Ridges
DH = 200.4 kJ/kg = 20,000 J/kgm/t=2 (sides of ridge)*h*l*r*velocityVelocity = 5 x 10-2 m/yrHeight, h = 3 x 103 m (~half of ocean crust)Length, l = 8 x 108 m (world’s ridges)r (of rock) = ~3g/cm3
Total = 4.8 x 1011 W
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P =mt× H
Collision zones
DH = 200.4 J/g = 20,000 J/kgP = (area*h*r*H)/tArea of Himalayas and Tibeten Plateau = ~30Gkm2
Height, h = 3.5 x 104 m (amount of total thickness 70km being metamorphosed)
r (of rock) = ~3g/cm3
Time, t = 40my/3 x 107 sec per yearTotal = 5.3 x 1010 W
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P =mt× H
Subduction
DH = 200.4 J/g = 20,000 J/kgm/t=h*l*r*velocityHeight = 100m sedimentLength = 5.5 x 107m (world’s subduction zones)r (of rock) = ~3g/cm3
Velocity = 5 x 10-2 m/yrTotal = 5.5 x 109 W
€
P =mt× H
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