Examples of dacitic

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These dacitic magmas may have evolved by the accumulation of multiple injections of mushy magma sustained over hundreds of thousands of years.
It must be noted that this algorithm is mainly calibrated for basaltic to dacitic melts and that it is less accurate for granitic liquids.
The majority of these are rhyolitic/dacitic/trondhjemitic and basaltic, commonly hosting massive sulphide deposits of economic importance.
The eruptions started with production of rhyolitic magma followed by dacitic to basaltic andesite magma.
Shortly before eruption, a dacitic magma has evolved into a water-rich melt laden with 40 to 50 % crystals.
The evolution of a dacitic magma system over an approximately 1 million year time period is shown in this series of cross-sections.
In contrast, monotonous dacitic magmas may never have been crystal-free near-liquidus magmas.
The roof collapses (e) and triggers eruption of the crystal-rich dacitic magma.
Furthermore, the eruptive characteristics and inferred crystallization histories imply that this type of crystal-rich dacitic magma was never near its liquidus.
It consists of welded dacitic ignimbrites, which lack quartz crystals and are further distinguished by zoned plagioclase crystal fragments.
In contrast, most comparable deposits described from the geological record are typically dacitic-rhyodacitic and contain rhyolitic glass.
Dacitic to andesitic basalts contain phenocrysts of pyroxene, altered feldspar and minor quartz often set in a groundmass of epidote-chlorite-glass.
Eruption from such a chamber produces a deposit that is dacitic and somewhat variable in composition, but not systematically zoned.
Several very large volume (> 1000 km of erupted magma) ignimbrites are dacitic and lack the vertical zonation found in many other tuffs.