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Definition of andesite in English: andesitenounˈandɪzʌɪtˈandɪsʌɪtˈandəˌzīt mass nounGeology A dark, fine-grained, brown or greyish intermediate volcanic rock which is a common constituent of lavas in some areas. Example sentencesExamples - The volcanic strata consist of sheet-like flows of andesite, dacite, basalts, and trachybasalts that are interbedded with agglomerates and tuffs.
- The main slivers of Devonian rocks found within the fault zone in the Rhynie area are sandstones and andesite in the Rhyme block and the Longcroft Tuffs in the Windyfield block.
- Some rocks have basaltic compositions similar to the well-studied meteorites thought to have come from Mars, but other rocks are more like the volcanic rock andesite.
- The clasts range from angular to subrounded and show a weak preferred orientation when elongate; they include micaceous siltstone, fine-grained sandstone, tuffaceous rock, andesite and medium-grained diorite.
- They are marked by eruptions of cooler, stickier lavas such as andesite, dacite and rhyolite.
Derivatives adjective Geology Batholiths and a large number of minor granitoid intrusions and andesitic lavas were produced showing predominantly calc-alkaline characteristic. Example sentencesExamples - The Longcroft Tuffs, a poorly exposed succession at least 140 m thick, are dominated by lapilli tuffs of andesitic composition.
- Previous work also has documented the presence of two distinct magma compositions beneath Nevado del Ruiz, one andesitic and the other dacitic, with mixing and mingling between the two during the November 1985 eruption.
- The sequence includes tuffaceous sandstone, andesitic sandstone and radiolarian chert.
- The hydrothermal activity may have been related to contemporary andesitic and/or granitic magmatism.
Origin Mid 19th century: named after the Andes mountains, where it is found + -ite1. Definition of andesite in US English: andesitenounˈandəˌzīt Geology A dark, fine-grained, brown or grayish volcanic rock that is intermediate in composition between rhyolite and basalt. Example sentencesExamples - The clasts range from angular to subrounded and show a weak preferred orientation when elongate; they include micaceous siltstone, fine-grained sandstone, tuffaceous rock, andesite and medium-grained diorite.
- They are marked by eruptions of cooler, stickier lavas such as andesite, dacite and rhyolite.
- The main slivers of Devonian rocks found within the fault zone in the Rhynie area are sandstones and andesite in the Rhyme block and the Longcroft Tuffs in the Windyfield block.
- Some rocks have basaltic compositions similar to the well-studied meteorites thought to have come from Mars, but other rocks are more like the volcanic rock andesite.
- The volcanic strata consist of sheet-like flows of andesite, dacite, basalts, and trachybasalts that are interbedded with agglomerates and tuffs.
Origin Mid 19th century: named after the Andes mountains, where it is found + -ite. |