Mid ocean ridges
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Mid-Ocean Ridges. JdFR. MAR. CIR. EPR. Thuan Chau , Yao Yao. SWIR. PAR. SEIR. Mid-Ocean Ridge. Underwater mountain system formed by plate tectonics. O ceanic spreading center Valley of rifts running along its spine Responsible for seafloor spreading

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Mid-Ocean Ridges

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Mid ocean ridges

Mid-Ocean Ridges

JdFR

MAR

CIR

EPR

ThuanChau, Yao Yao

SWIR

PAR

SEIR


Mid ocean ridge

Mid-Ocean Ridge

  • Underwater mountain system formed by plate tectonics.

  • Oceanic spreading center

    • Valley of rifts running along its spine

    • Responsible for seafloor spreading

  • Magma, which comes out at the linear weakness part in the oceanic crust, becomes the new seafloor when it cools down.

  • Longest mountain range in the world 80,000km long (65,000km continuous).


Classes of ridges

Classes of Ridges

  • Fast-spreading ridges, like the East Pacific Rise, the spreading rate is 100 to 200 millimeters per year.

  • Slow-spreading ridges, like the Mid Atlantic Ridge, the spreading rate is 20 to 40 millimeters per year.

  • Ultraslow-spreading ridges, like the Southwest Indian Ridge, the spreading rate is less than 20 millimeters per year.


Mid ocean ridges

Central Indian Ridge:

Western regions of the Indian Ocean.

Lava flow: 0.51-0.68 km3/year

Average spreading rate: 1.13 cm/year

Southwest Indian Ridge:

Southwest Indian ocean

Separated the African and Antarctic plates

Average spreading rate: 13-18 mm/year

Mid-Atlantic Ridge:

Atlantic Ocean

Separated Africa and South America

Average spreading rate: 2.5 cm/year


Mid ocean ridges

  • Juan de Fuca Ridge:

  • (500km long, 8km wide)

  • Subductionzone, divergent zone, transform zone.

  • 1.8 to 3 cm/yr.

  • frequency of seismic events.

  • East Pacific Rise:

  • Volcanic chain – 1,800 to 2,700 m above seafloor

  • 16 cm/ yr (Chile)

  • 6cm/yr (Gulf of California)

  • Pacific Antarctic Ridge:

  • Divergent tectonic plate boundary located in the South Pacific Ocean.

  • Rate of spreading is 54-76mm/yr.

  • Southeast Indian Ridge:

  • Intermediate spreading ridge

  • ~60 to 80 mm/yr


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