[ploo-ton] /ˈplu tɒn/

noun, Geology.
any body of igneous rock that solidified far below the earth’s surface.
any mass of igneous rock that has solidified below the surface of the earth
A large body of igneous rock formed when a plume of magma cools and solidifies underground. Although most plutons are deep within the Earth’s crust, some become exposed at the surface due to plate-tectonic processes.


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  • Plutonian

    [ploo-toh-nee-uh n] /pluˈtoʊ ni ən/ adjective 1. Also, Plutonic [ploo-ton-ik] /pluˈtɒn ɪk/ (Show IPA). of, relating to, or resembling Pluto or the lower world; infernal. /pluːˈtəʊnɪən/ adjective 1. of or relating to Pluto (the god) or the underworld; infernal adj. 1660s, “pertaining to the god Pluto,” from Latin Plutonius, from Greek Ploutonius, from Plouton “pertaining […]

  • Plutonic

    [ploo-ton-ik] /pluˈtɒn ɪk/ adjective, Geology. 1. noting or pertaining to a class of igneous rocks that have solidified far below the earth’s surface. /pluːˈtɒnɪk/ adjective 1. (of igneous rocks) derived from magma that has cooled and solidified below the surface of the earth Also abyssal adj. “pertaining to or involving intense heat deep in the […]

  • Plutonic rock

    noun See intrusive rock

  • Plutonism

    [ploot-n-iz-uh m] /ˈplut nˌɪz əm/ noun, Geology. 1. the intrusion of magma and associated deep-seated processes within the earth’s crust. 2. (often initial capital letter) the disproven theory that all rocks formed by solidification of a molten mass, promulgated by Scottish geologist James Hutton (1726–97).

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