Visual Glossary
DikesDikes are sheet-like or tabular igneous intrusions that cut across sedimentary layering, metamorphic foliation, or other texture of a pre-existing rock. The dikes shown in the photograph above are made of basalt that was injected while still molten into older granites. Click here to see the same photo with labels. Use the back button on your browser to return to previous page. |
Basalt dikes cut across granite along the Klondike Highway in
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