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Dyke |
  
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Dyke |
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Definition A tabular or sheet-like body of igneous rock that cuts through and across the layering of adjacent rocks. Description They form when igneous molten rock rises into an existing fracture or zone of weakness. They usually comprise of dolerite or diabase. Why is a dyke important? Dykes often have low permeabilities and thus form aquicludes or aquitards. Contact zones between the dykes and host rocks can be fractured and transmissive.
Source: http://natureinquiries.files.wordpress.com |
