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Causes (1), (3) and (4) could operate in concert as a subduction trench converged on a rifted margin.
Contrary to the suggestion of a relationship between ridge subduction and compression, the main result of this collision has been fast uplift and extensional tectonism.
However, the geochemical data are consistent with derivation of magmas from a mantle source modified by subduction processes.
The second model involves derivation of the melts from a depleted lithospheric mantle source which was contaminated by subduction components.
Subduction of dense cold plates into the mantle leads to plate tectonics.
A physical model for the volume and composition of melt produced by hydrous fluxing above subduction zones.
Lithospheric buoyancy and collisional orogenesis: subduction of oceanic plateaus, continental margins, island arcs, spreading ridges, and seamounts.
With continuing subduction the pelagic sediments might have been dragged beneath the accretionary prism leading to compaction and expulsion of large amounts of pore fluids.
Thus, fluids associated with subduction may have been responsible for triggering partial melting of lithosphere already experiencing decompression as a result of extension.
Evolution of retreating subduction boundaries formed during continental collision.
They are, however, characteristic features of subduction-related magmas or of continental tholeiites, including flood basalts.
Continuous subduction also leads to off-scraping of the metamorphic blocks under low-temperature conditions.
For example the basalts could be inferred to have intraplate characteristics, and the andesites to be subduction-related.
The chapters on mid-ocean ridges and subduction zones were disappointing.
An effect of flat slab subduction would have been a magmatic arc gap.
