Igneous Rocks and Plate Tectonics . Igneous Petrotectonic Assemblages. Igneous Rocks and Tectonics. Igneous rock formation largely tied to tectonic activity 3 main tectonic settings for making igneous rocks:. Igneous Rocks at Divergent Margins: Mid-Ocean Ridges. Magma origin:
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Igneous Petrotectonic Assemblages
Continent-Continent Plate convergenceIgneous Rocks at Convergent Margins
Crustal thickening due to thrust faulting during collision
Causes partial meting of crustal rocks (anatexis)
Magma composition depends largely on the source rocks that were melted
Dominantly felsic compositionIgneous Rocks at Convergent Margins: Continental Collisions