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Definition of volcanism in English: volcanism(also vulcanism) noun ˈvɒlkənɪz(ə)m mass nounGeology Volcanic activity or phenomena. 〔地质〕火山活动；火山现象 extensive volcanism occurred during the Ordovician in the Lake District and Wales Example sentencesExamples - The onset of volcanism in the region occurred in late Ordovician times, with the earliest eruptions associated with the Eycott and Borrowdale volcanic groups.
- Carboniferous volcanism, occurring at converging plates margins, both at the Appalachian and at the Ouachita margins, was decidedly not tholeiitic.
- The radiometric age data combined with the petrography of the volcanics thus indicate two separate events of volcanism in the Danish North Sea.
- The scattered nature of the outcrop and the possibility of diachronous volcanism mean that all rocks grouped as Dokhan Volcanic Series may not be coeval.
- This appears to contradict evidence from other areas, particularly Wales where subduction-related volcanism occurs in the late Tremadoc.
Definition of volcanism in US English: volcanism(also vulcanism) noun Geology Volcanic activity or phenomena. 〔地质〕火山活动；火山现象 extensive volcanism occurred during the Ordovician in the Lake District and Wales Example sentencesExamples - The scattered nature of the outcrop and the possibility of diachronous volcanism mean that all rocks grouped as Dokhan Volcanic Series may not be coeval.
- Carboniferous volcanism, occurring at converging plates margins, both at the Appalachian and at the Ouachita margins, was decidedly not tholeiitic.
- The radiometric age data combined with the petrography of the volcanics thus indicate two separate events of volcanism in the Danish North Sea.
- The onset of volcanism in the region occurred in late Ordovician times, with the earliest eruptions associated with the Eycott and Borrowdale volcanic groups.
- This appears to contradict evidence from other areas, particularly Wales where subduction-related volcanism occurs in the late Tremadoc.
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