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词汇 trachyte
释义

Definition of trachyte in English:

trachyte

noun ˈtreɪkʌɪtˈtrakʌɪt
mass nounGeology
  • A grey fine-grained volcanic rock consisting largely of alkali feldspar.

    〔地质〕粗面岩

    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:

trachyte

noun
Geology
  • A gray fine-grained volcanic rock consisting largely of alkali feldspar.

    〔地质〕粗面岩

    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’.

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