It is clear that such narrow cracks would be incapable of transporting significant volumes of magma through the lithosphere.
Selecting 100 km gives a conservative estimate as this area has the thinnest lithosphere and will produce the least lamprophyre on rifting.
The strain rate at which the lithosphere was stretched is taken as a standard 10-15sec-1.
The volume and composition of melt generated by extension of the lithosphere.
In particular, is the source of within-plate basaltic magmas in an extensional setting the lithosphere, convecting asthenosphere or both?
Instead, our results suggest that convective drawdown plays a role by pulling lithosphere toward the zone of maximum shortening.
There is considerable debate about the range of values of e for continental lithosphere.
Either of these mechanisms can cause the hot asthenosphere to rise close to the metasomatized lithosphere, initiating melting.
