Seafloor Spreading, Palaeomagnetism, Age of Seafloor Rocks
- Created by: 14whifre
- Created on: 06-05-21 13:54
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- Seafloor Spreading, Palaeomagnetism, Age of Seafloor Rocks
- Seafloor Spreading
- lateral movement of new oceanic crust away from mid atlantic ridge (constructive plate boundary)
- plates moved from mid-ocean ridges to subduction at ocean trench
- Palaeomagnetism
- changes of alignment of magnetic minerals in sedimentary and igneous rock
- iron particles in lava aligned with earths magnetic field
- polarity reverses every 400000-500000 years
- magnetic striped aligned alternately
- striped pattern suggests moving away from the boundary
- Age of Seafloor Rocks
- ocean drilling recovered cores in water up to 7000m deep
- pattern of sediment that supported seafloor spreading
- thickest and oldest closest to continents
- all rock less than 2 million years old
- ocean crust continuously recycled
- ocean drilling recovered cores in water up to 7000m deep
- Seafloor Spreading
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