Image: Igneous structures

Description: Schematic overview of plutonic, subvolcanic and volcanic structures/rock bodies and accompanied processes and phenomena. Structures: A = active magma chamber (called pluton when cooled and entirely crystallized; a batholith is a large rock body composed of several plutonic intrusions) B = old magmatic dykes/dikes C = emerging laccolith D = old pegmatite (late-magmatic dyke formed by aggressive and highly mobile residual melts of a magma chamber) E = old and emerging magmatic sills F = stratovolcano Accompanied processes and phenomena: 1 = young, emerging subvolcanic intrusion cutting through older one 2 = xenolith (solid rock of high melting temperature which has been transported within the magma from deep below) or roof pendant (fragment of the roof of the magma chamber that has detached from the roof and sunk into the melt) 3 = contact metamorphism in the country rock adjacent to the magma chamber (caused by the heat of the magma) 4 = uplift at the surface due to laccolith emplacement in the near subground.
Title: Igneous structures
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