African Hot Spot Volcanism: Small-Scale Convection in the Upper Mantle Beneath Cratons

Periodic hotspot distribution and small-

Periodic hotspot distribution and small-scale convection in the upper mantle

✍ Atsushi Yamaji 📂 Article 📅 1992 🏛 Elsevier Science 🌐 English ⚖ 895 KB

Shear-wave splitting and small-scale con

Shear-wave splitting and small-scale convection in the continental upper mantle

✍ Makeyeva, L. I.; Vinnik, L. P.; Roecker, S. W. 📂 Article 📅 1992 🏛 Nature Publishing Group 🌐 English ⚖ 504 KB

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.

✍ L.-E. Ricou 📂 Article 📅 1998 🏛 John Wiley and Sons 🌐 English ⚖ 197 KB

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