释义 |
Definition of trachyte in English: trachytenoun ˈtreɪkʌɪtˈtrakʌɪt mass nounGeology A grey fine-grained volcanic rock consisting largely of alkali feldspar. Example sentencesExamples - Its occurrence is largely restricted to relatively unusual alkalic igneous rocks, such as sodic granites, certain syenites and trachytes, and related carbonatite-bearing terranes.
- In the Canaries, the lavas are much more compositionally varied in each of these stages, ranging from tholeiitic basalts to phonolites and trachytes.
- Sanidine is found only in quickly cooled lavas such as trachytes; microcline occurs in slowly cooled granites.
- The dominant magma types are basalts and hawaiites, with lesser amounts of trachytes, quartz trachytes, alkali rhyolites and phonolites.
- The mine workings occupy much of the west side of an isolated low hill composed mainly of light-colored volcanic rock, described as felsite porphyry or trachyte, highly altered to clay minerals.
Origin Early 19th century (denoting a volcanic rock with a rough or gritty surface): from Greek trakhus 'rough' or trakhutēs 'roughness'. Definition of trachyte in US English: trachytenoun Geology A gray fine-grained volcanic rock consisting largely of alkali feldspar. Example sentencesExamples - In the Canaries, the lavas are much more compositionally varied in each of these stages, ranging from tholeiitic basalts to phonolites and trachytes.
- The dominant magma types are basalts and hawaiites, with lesser amounts of trachytes, quartz trachytes, alkali rhyolites and phonolites.
- The mine workings occupy much of the west side of an isolated low hill composed mainly of light-colored volcanic rock, described as felsite porphyry or trachyte, highly altered to clay minerals.
- Its occurrence is largely restricted to relatively unusual alkalic igneous rocks, such as sodic granites, certain syenites and trachytes, and related carbonatite-bearing terranes.
- Sanidine is found only in quickly cooled lavas such as trachytes; microcline occurs in slowly cooled granites.
Origin Early 19th century (denoting a volcanic rock with a rough or gritty surface): from Greek trakhus ‘rough’ or trakhutēs ‘roughness’. |