dacite
IPA: dˈeɪsaɪt
noun
- (geology) An igneous, volcanic rock with a high iron content.
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Examples of "dacite" in Sentences
- Rocks formed from felsic magma include granite, granodiorite, dacite, and rhyolite.
- Rhyolite and dacite are produced from continental lava flows that solidify quickly.
- Basalt magma typically generates very little ash compared to other types (andesite, dacite, and rhyolite).
- An intrusive complex of dacite with sedimentary and metamorphic rocks of Palaeozoic age comprise the predominant rock forms.
- They cover up to 100 miles of trail beneath silver wattle and broad-leaf peppermint trees, scramble across crumbly dacite rocks.
- Montierth explained that Tumtum and St. Helens were both formed out of thick, gooey lava that doesn't travel far as it cools into dacite rock.
- Dacite lava hand sample, with abundant amphibole and plagioclase feldspar. magma mixing or crustal assimilation (by another magma) to form the dacite.
- At Goldfield, Nevada, native gold is found in surface igneous flows of a dacite type, which have undergone extensive hydrothermal alterations characterized by the development of alunite (a potassium-aluminum sulphate), quartz, and pyrite.
- The 2009 drilling program identified widespread gold mineralization associated with mineralized and altered dacite porphyry and adjacent sedimentary and volcanic rocks, drill hole DDH09-014 revealed gold mineralization of 111 meters grading up to 7.28 grams/tonne.
- For example, volcanic eruptions range from (1) effusion of lava fountains and flows with very little ash erupted, typical of basaltic magma eruptions; to (2) extremely explosive eruptions that inject large quantities of ash high into the stratosphere, typical of rhyolite and dacite magmatic eruptions.
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