Examples of dacite

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Since the enclaves are more mafic than the host dacite lava, they formed from magma both hotter and denser than that occupying the chamber.
Given the similarity of major element compositions for the enclaves and host dacite, what is the factor which resulted in these differences?
As noted, the natural dacite ignimbrites are phenocryst-rich.
For pressures < 0.5 kbar, the bulk density of the replenishing magma is typically lower than that of the host dacite on injection.
The viscosity of the waterpoor but silica-rich rhyolite magma is about 0.5 log units higher than for the water-rich dacite magma at a given temperature.
These important rheological transitions occur near the crystallinity of the very large volume dacites considered here.
For systems lying above the line, the replenishing magma will become less dense than the dacite while it is still hotter than the resident magma.
The calculations were carried out at 1 kbar, using an average enclave composition and an average dacite composition from the 1940 flow.

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