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Mass heterogeneities and convection in the earth's mantle inferred from gravity and core-mantle boundary irregularities

✍ Scribed by Ondřej Čadek; Ctirad Matyska

Publisher
Springer
Year
1991
Tongue
English
Weight
952 KB
Volume
135
Category
Article
ISSN
0033-4533

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The global network of plate boundaries c
The global network of plate boundaries can be divided into two discrete subnetworks containing the spreading and subduction boundaries, respectively. We advocate that this division is a stable pattern that derives from consistency rules in rigid-plate rotations. Subduction is distributed along a single, long subnetwork, hence organizing the mantle convection as a single, long downwelling wall and two lower mantle upwelling columns, at the Pacific and African sides of the Earth, respectively. The columns should merge upward between Antarctica and Australia to reach the single, long spreading subnetwork. The flow encircles two toric volumes that escape convectional mixing and are the likely sources of the two, Atlantic–Indian and Pacific, hot spot domains.
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The global network of plate boundaries can be divided into two discrete subnetworks containing the spreading and subduction boundaries, respectively. We advocate that this division is a stable pattern that derives from consistency rules in rigid‐plate rotations. Subduction is distributed along a sin