How To Use Dacite In A Sentence
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They cover up to 100 miles of trail beneath silver wattle and broad-leaf peppermint trees, scramble across crumbly dacite rocks.
TIME.com: Top Stories
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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 Economic Aspect of Geology
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Dacite lava hand sample, with abundant amphibole and plagioclase feldspar. magma mixing or crustal assimilation (by another magma) to form the dacite.
ScienceBlogs Channel : Life Science
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Field work has been focused to define a drilling program to test the gold mineralization present in a silicified dacite dike (previously classified as a rhyolite dike), which outcrops extensively on the concessions.
Marketwire - Breaking News Releases
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The volcanic strata consist of sheet-like flows of andesite, dacite, basalts, and trachybasalts that are interbedded with agglomerates and tuffs.
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Unchallengeable examples of what are assumed to have been beta quartz appear to be limited to occurrences in silicic volcanic rocks, such as rhyolite, liparite, and dacite.
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The lava dome is made of dacite, a fine-grained volcanic rock that contains a sprinkling of larger, visible crystals, like chopped fruit in a cake.
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Basalt magma typically generates very little ash compared to other types (andesite, dacite, and rhyolite).
Volcanic ash hazards and ways to minimize them
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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.
The Seattle Times
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Rocks formed from felsic magma include granite, granodiorite, dacite, and rhyolite.
Igneous rock
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Rocks formed from felsic magma include granite, granodiorite, dacite, and rhyolite.
Igneous rock
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Basalt magma typically generates very little ash compared to other types (andesite, dacite, and rhyolite).
Volcanic ash hazards and ways to minimize them
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Two series of igneous rocks have been found: tholeiitic, ranging from picrite basalt to basaltic andesite (to rhyodacites); mildly alkaline, with a more restricted compositional range (picrite basalts and basalts).
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This age is essentially identical with the rhyodacite laccoliths in the Grosvenor Hills intrusion which are also reversely polarized.
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Here colorless to yellow crusts of mimetite coat open spaces and coarse fragments in brecciated dacite.
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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.
Volcanic ash hazards and ways to minimize them
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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 Economic Aspect of Geology
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They are marked by eruptions of cooler, stickier lavas such as andesite, dacite and rhyolite.
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An intrusive complex of dacite with sedimentary and metamorphic rocks of Palaeozoic age comprise the predominant rock forms.
Central Eastern Rainforest Reserves, Australia
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The volcanic strata consist of sheet-like flows of andesite, dacite, basalts, and trachybasalts that are interbedded with agglomerates and tuffs.
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Rhyolite and dacite are produced from continental lava flows that solidify quickly.
Igneous rock
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The canyon is carved out of dacite, and there are some large trees with yellow and green leaves.
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The volcanic strata consist of sheet-like flows of andesite, dacite, basalts, and trachybasalts that are interbedded with agglomerates and tuffs.
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Dacite and granodiorite contain slightly more biotite and amphibole minerals than granite and rhyolite.
Igneous rock
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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.
Marketwire - Breaking News Releases
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The lopolith lies with complete discordance upon plutonic and metamorphic rocks of complicated structural and metamorphic history, and is overlain concordantly by rhyodacite tuffs which are intruded by the granophyre and are in turn overlain concordantly by sedimentary rocks.
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The belt comprises subalkaline andesites, trachyandesites, dacites, rhyolites, trachyrhyolites, and granodiorites, granites, granosyenites and monzonites, and developed along an active continental margin.