Examples of silicic

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Lines are best fit lines forced through the most silicic sample of the respective deposit.
Most such silicic magmas are generated within the framework of already-existing continental material, and their origin has been extensively investigated in this continental setting.
Distinguishing strongly rheomorphic tuffs from extensive silicic lavas.
Subsequent intrusion of silicic magmas along these ring faults yielded the granites now preserved peripheral to the caldera-fill sequences.
World-wide occurrences of thick, densely welded ignimbrites of intermediate composition are poorly documented, whereas silicic examples are common.
This suggests that the injection of basaltic andesite gradually mixed with the resident silicic magma up to a defined level.
Since a silicic melt produced by anatexis is inevitably close to equilibrium with several mineral phases, crystal nucleation is favoured through the entire magma body.
In silicic magmas this condition is readily achieved, even in thick heat-retaining units, due to high viscosity.
It may be assumed that the process of crustal melting was progressive, and this caused the production of various silicic melts and various restitic phases.
The most silicic part of the layers contain 2 to 11 % crystals, mostly plagioclase and some fayalitic olivine.
These zircons could only have been captured by mixing from the silicic magma which is saturated in zircon.
Crystals are of similar size as in the silicic part, but in some zones no crystals were found.
The suggested model involves partial melting of older tholeiitic crust to produce silicic magma, which segregated and accumulated in deep crustal reservoir.

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