Relationship between Petrogenesis and Geodynamics

Numerous hypotheses have been proposed to explain the relationship between magma genesis and the geodynamic evolution of the Tyrrhenian Sea and adjoining regions. In broad terms, three general classes of hypotheses can be recognised  

Lithospheric stretching, passive upwelling of asthenosphere and variable degrees of decompression melting at various mantle levels in an intracontinental rifting setting  

Upwelling of deep-rooted mantle plumes that impinge upon the lithosphere, cause opening of the Tyrrhenian basins and trigger magmatism  

Subduction-related processes, which generate differing styles of mantle contamination of sub-arc mantle, back-arc opening of the Tyrrhenian Sea and generation of variable types of magmas. 

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