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A model for plate tectonic evolution of mantle layers
Science (New York, N.Y.)
|October 22, 1971
Summary
Lithosphere sinking into the mantle forms a new inner mantle layer. This process, driven by radiogenic heat, explains mantle evolution and predicts the end of plate tectonics.
Area of Science:
- Geophysics
- Geochemistry
- Tectonics
Background:
- Lithosphere composition is derivative, formed as a refractory residue from partial melting.
- Subducted lithosphere is not readily resorbed by the parent mantle.
Purpose of the Study:
- To propose a model for mantle evolution and layer formation.
- To investigate the physicochemical evolution of the Earth's mantle.
Main Methods:
- Modeling mass transfer from lithosphere to mesosphere.
- Assuming mass transfer rate is proportional to radiogenic heat production.
Main Results:
- The entire present mesosphere could have formed within 3 to 4.5 billion years.
- Continental crust generation is consistent with the model over the last 3 billion years.
Conclusions:
- The proposed model explains irreversible mantle physicochemical evolution.
- Plate tectonic behavior is predicted to cease within the next billion years.
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