One of the big, of rather, THE bigthing going against this case here is that there is no evidence that it happened. What's so wrong with regular volcanism? When tambora blew its top, it caused devestating climactic change that led to a "year without a summer". 65km of debris shot into the atmosphere, but not as a single lump. and tambora's not even a supervolcano.
basically, to launch a solid dome into the air would take immense gas pressure, certainly. but it would also require:
1. a volcano that is perfectly solid, not a crack in the rock sort of thing.
2. an extremely dense, stable, mafic material composing the volcano, the dome, and the greater surrounding area.
3. a magma so silicic that it is capable of holding gases for a very long time
basically, you'd need silicic magma to come from a mafic volcano. oh, and perfect structural stability for hundreds of square km.
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New Dinosaur-extinction Theory
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