Definition

1. Adjective:
   • Relating to igneous rock formed by solidification deep beneath the Earth's surface: The term "plutonic" describes rocks that have crystallized from magma slowly cooling far underground, resulting in a coarse-grained texture.
   • Pertaining to Pluto or the infernal regions (archaic/poetic): In older or literary contexts, "plutonic" can refer to things associated with the classical god Pluto or the underworld.

Usage Examples

• Adjective (Geological):
  • Granite is a classic example of a plutonic rock.
  • The mountain range is composed primarily of plutonic formations like diorite and gabbro.
• Adjective (Literary/Archaic):
  • The poet described the cavern's depths with a plutonic gloom.

Advanced Usage

• "plutonic activity": Geological processes involving the formation, movement, and solidification of magma deep within the Earth's crust.
  • The region's complex geology is a result of ancient plutonic activity.
• "plutonic complex": A large, intrusive igneous rock body formed from solidified magma chambers.
  • Geologists are studying the batholith, a massive plutonic complex.

Variants and Related Words

• Pluton (n): A general term for any body of intrusive igneous rock.
  • The Sierra Nevada batholith is a famous pluton.
• Plutonism (n): The geologic theory that emphasizes the role of igneous processes, particularly the solidification of magma, in rock formation and mountain building.
• Plutonite (n): A synonym for plutonic rock.

Synonyms

• Abyssal: (Geology) Relating to or denoting igneous rock formed at great depth.
• Intrusive: (Geology) Denoting igneous rock that has forced its way into or between other rocks while molten.
• Hypabyssal: (Geology) Denoting igneous rock that has solidified near the surface, intermediate between plutonic and volcanic.

Antonyms

• Volcanic: Relating to igneous rock that has solidified on or very near the Earth's surface (extrusive).
• Extrusive: Denoting igneous rock that has been ejected onto the Earth's surface.

Related Phrases/Concepts

• Plutonic rock series: A sequence of related plutonic rocks that form from a common magma source.
• Plutonic-volcanic association: The genetic relationship between deep-seated plutonic rocks and their volcanic (surface) equivalents.

Adjective

1. of igneous rock that has solidified beneath the earth's surface; granite or diorite or gabbro