1. of or relating to igneous rock formed at moderate depth beneath the Earth's surface, typically at depths between 1 and 5 kilometers.
Usage: geology; technical

Examples

• Hypabyssal rocks exhibit crystal sizes intermediate between volcanic and plutonic rocks.
• The geologist identified the sample as hypabyssal granite based on its mineral composition and texture.
• Hypabyssal intrusions often form dikes and sills in the upper crust.
• The cooling rate of hypabyssal magma produces a distinctive porphyritic texture.
• Many ore deposits are associated with hypabyssal igneous activity.