0 (of rocks) formed by the cooling and solidification of magma or molten lava. -- vulkansk
The granular cause of igneous fabrics is often complex and the magnetic lineation cannot invariably be linked to flow direction.
We tested one greywacke and three igneous compositions as contaminants.
Primary hornblende is commonly partially replaced by fine decussate biotite indicative of some static recrystallization, although plagioclase retains igneous zoning.
All divisions exhibit igneous layering on a variety of scales.
The preservation of abundant igneous plagioclase, however, indicates that the body largely failed to equilibrate at eclogite-facies conditions.
These coarse-grained patches are igneous in origin and grade into finer-grained gabbro at the edges.
Igneous lithologies vary from diorite through granodiorite, and granite to pegmatitic granite.
For the geologist, these two plume types are identified respectively with the large igneous province, and the hotspot trail.
