Dikes are tabular or sheet-like bodies of magma that cut through and across the layering of adjacent rocks and then solidify. They form when magma rises into a fissure or creates a new crack by ...
Our rock map of Zealandia is a first reconnaissance ... For about 40 million years, as magma flooded out of cracks and fissures, Zealandia stretched and thinned “like pizza dough”, Mortimer ...