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زمینشناسی و معدن::
استنوسفر
When continental crust is strongly thinned by the rifting process, hot asthenosphere rapidly ascends.
The interaction of the subduction zone and the asthenosphere of the mantle generates the melts that rise to feed the volcanism typical of island arcs and active conti- nental margins.
Oceanic lithosphere is bent downward under the margin of the "upper plate" and dives into the asthenosphere.
Because oceanic lithosphere becomes denser with increasing age, it can achieve a density greater that that of the underlying asthenosphere and thus
The roll-back of the westward directed subduction zones may be enhanced by an eastward directed asthenospheric current as calculated from global plate drift compared to flow of the sublithospheric mantle (LePichon, 1968; Doglioni et al.
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