Definition of Plutanic
Plu*ton"ic (?), a. [Cf. F.
plutonique. See Pluto.] 1. Of or
pertaining to Pluto; Plutonian; hence, pertaining to the interior of
the earth; subterranean.
2. Of, pertaining to, or designating, the
system of the Plutonists; igneous; as, the Plutonic
theory.
Plutonic action (Geol.), the influence
of volcanic heat and other subterranean forces under pressure. --
Plutonic rocks (Geol.), granite,
porphyry, and some other igneous rocks, supposed to have consolidated
from a melted state at a great depth from the surface. Cf.
Intrusive rocks, under Intrusive. --
Plutonic theory. (Geol.) See
Plutonism.
- Webster's Unabridged Dictionary (1913)
- An igneous rock that cooled and hardened below the earth's surface.
- A body of once molten rock that cooled below the earth's surface. The term implies a large body. Smaller instances are called dikes, sills, or plugs.
- The Nuttall Encyclopedia
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