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Gang (geologi)

En geologisk gang (dyke) er vulkanske inntrengninger inn i en allerede eksisterende berggrunn. En gang kan også være sedimentære avsetninger i allerede eksisterende sprekk i berget. Gangen skjærer gjennom den opprinnelige steinmassen normalt i en nesten vertikal retning, til motsetning av siller, som skjærer på langs. Gangene er altså yngre enn berggrunnen omkring, og kan være fra noen centimeter til mange meter tjukke, og fra noen desimeter til flere titalls kilometer lange.

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