Definitions
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- noun Plural form of
dacite .
Etymologies
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Examples
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Certain igneous rocks called dacites contain small millimeter-sized quartz crystals, which in turn have tiny nanometer-sized magnetic inclusions.
PhysOrg.com - latest science and technology news stories 2010
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Matthew E. Brueseke, William K. Hart, 2009, Intermediate composition magma production in an intracontinental setting: Unusual andesites and dacites of the mid-Miocene Santa Rosa-Calico volcanic field, Northern Nevada
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Volcanic rocks throughout the protected areas are formed of basalts, andesite-basalts, andesites and andesite-dacites.
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Rock chip samples of these exposed altered dacites volcanic rocks returned local gold anomalies in the range of 0.5 to 5 g/t Au.
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The recognition that the altered dacites host rock, found underneath the till cover on the western portion of the property, was widely exposed at surface in an outcrop on the eastern side of the Burns Block.
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Detailed chip sampling of dacites outcrops is being done on an established grid in the area of step-out hole RR11-131 which discovered three near surface zones of gram level gold mineralization previously reported.
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The wall rocks to the mineralization are the same dacites volcanic package found in the western portion of the Burns Block.
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In addition, surface sampling of dacites outcrops in the northeast portion of the property is being done to help define the trend of newly discovered, near surface gold/silver mineralization previously reported step-out hole RR11-131.
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Boisvert (1989) describes a variety of lithologies in the region, including biotite schists and gneisses, basalts, dacites, quartzites, conglomerates, gabbros, granites and pegmatites.
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If the dacite is hot and dry (lacking in water), you would expect to find pyroxene in the lava as well, although it is common in almost all dacites that even have hydrous minerals.
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