Concept
Alternate Profiles
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Alternate Profiles ?Profiles (alternative information views) encoded in various Media Types (HTML, text, RDF, JSON etc.) are available for this resource.
- Preferred Labelskos:prefLabel
andesite
- URI
- http://resource.geosciml.org/classifier/cgi/lithology/andesite ↗Go to the persistent identifier link
- Within Vocab
- Simple Lithology
| Preferred Labelskos:prefLabel | andesite |
|---|---|
| Definitionskos:definition | Fine-grained igneous rock with less than 20 percent quartz and less than 10 percent feldspathoid minerals in the QAPF fraction, in which the ratio of plagioclase to total feldspar is greater 0.65. Includes rocks defined modally in QAPF fields 9 and 10 or chemically in TAS field O2 as andesite. Basalt and andesite, which share the same QAPF fields, are distinguished chemically based on silica content, with basalt defined to contain less than 52 weight percent silica. If chemical data are not available, the color index is used to distinguish the categories, with basalt defined to contain greater than 35 percent mafic minerals by volume or greater than 40 percent mafic minerals by weight. Typically consists of plagioclase (frequently zoned from labradorite to oligoclase), pyroxene, hornblende and/or biotite. Fine grained equivalent of dioritic rock. |
| Exact MatchexactMatch |
http://inspire.ec.europa.eu/codelist/LithologyValue/andesite
|
| Narrowernarrower |
boninite
|
| Broaderbroader |
fine grained igneous rock
intermediate composition igneous rock |
| See AlsoseeAlso | Simple Lithology |
| Exampleexample | mela-andesite |
| Notenote | Note the mela-andesite and leuco-basalt categories are not recommended in this system. If chemical analytical data are available to constrain the silica content, the basalt or andesite category should be used. |
| Is Defined ByisDefinedBy | Simple Lithology |