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Thermal and mechanical structure of the upper mantle : A comparison between continental and oceanic models

Author
Yuen, D. A.
Published
JAN 1, 1976.
Physical Description
1 electronic document
Additional Creators
Froidevaux, C. and Schubert, G.
Online Version

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Unclassified, Unlimited, Publicly available.
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Summary
Temperature, velocity, and viscosity profiles for coupled thermal and mechanical models of the upper mantle beneath continental shields and old ocean basins show that under the continents, both tectonic plates and the asthenosphere, are thicker than they are beneath the oceans. The minimum value of viscosity in the continental asthenosphere is about an order of magnitude larger than in the shear zone beneath oceans. The shear stress or drag underneath continental plates is also approximately an order of magnitude larger than the drag on oceanic plates. Effects of shear heating may account for flattening of ocean floor topography and heat flux in old ocean basins.
Other Subject(s)
Collection
NASA Technical Reports Server (NTRS) Collection.
Note
Document ID: 19760022699.
Accession ID: 76N29787.
NASA-CR-148599.
Terms of Use and Reproduction
No Copyright.
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