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Dajk (žila, žica)

Dajkovi su većinom vulkanske intruzije u postojećim stijenama. Dajk može biti i sedimentna naslaga u postojećoj pukotini. Dajk presijeca postojeću stijenu i uglavnom je vertikalan ili približno vertikalan.

Vulkanski dajkovi pojavljuju se zbog pritisaka, naprezanja i deformacija u podzemlju, što dovodi do pojavljivanja dajkova u pogođenom području. Dajk je lako prepoznatljiv jer presijeca geološki stup.

Za dajkove i silove u vulkanskim stijenama vrijedi da često stvaraju stupaste spojeve tijekom procesa hlađenja.

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